C# CompletionDataCollector.Add方法代码示例

		public ICompletionDataList HandleKeywordCompletion (CodeCompletionContext completionContext, ExpressionResult result, int wordStart, string word)
		{
			if (stateTracker.Engine.IsInsideDocLineComment || stateTracker.Engine.IsInsideOrdinaryCommentOrString)
				return null;
			DomLocation location = new DomLocation (completionContext.TriggerLine, completionContext.TriggerLineOffset);
			switch (word) {
			case "using":
				if (result.ExpressionContext != ExpressionContext.NamespaceNameExcepted)
					return null;
				return CreateCompletionData (location, new NamespaceResolveResult (""), result, null);
			case "namespace":
				result.ExpressionContext = ExpressionContext.NamespaceNameExcepted;
				return CreateCompletionData (location, new NamespaceResolveResult (""), result, null);
			case "case":
				return CreateCaseCompletionData (location, result);
			case ",":
			case ":":
				if (result.ExpressionContext == ExpressionContext.InheritableType) {
					IType cls = NRefactoryResolver.GetTypeAtCursor (Document.CompilationUnit, Document.FileName, new DomLocation (completionContext.TriggerLine, completionContext.TriggerLineOffset));
					CompletionDataList completionList = new ProjectDomCompletionDataList ();
					List<string> namespaceList = GetUsedNamespaces ();
					CSharpTextEditorCompletion.CompletionDataCollector col = new CSharpTextEditorCompletion.CompletionDataCollector (dom, completionList, Document.CompilationUnit, null, location);
					bool isInterface = false;
					HashSet<string> baseTypeNames = new HashSet<string> ();
					if (cls != null) {
						baseTypeNames.Add (cls.Name);
						if (cls.ClassType == ClassType.Struct)
							isInterface = true;
					}
					int tokenIndex = completionContext.TriggerOffset;

										// Search base types " : [Type1, ... ,TypeN,] <Caret>"
					string token = null;
					do {
						token = GetPreviousToken (ref tokenIndex, false);
						if (string.IsNullOrEmpty (token))
							break;
						token = token.Trim ();
						if (Char.IsLetterOrDigit (token[0]) || token[0] == '_') {
							IType baseType = dom.SearchType (Document.CompilationUnit, Document.CompilationUnit, token);
							if (baseType != null) {
								if (baseType.ClassType != ClassType.Interface)
									isInterface = true;
								baseTypeNames.Add (baseType.Name);
							}
						}
					} while (token != ":");
					foreach (object o in dom.GetNamespaceContents (namespaceList, true, true)) {
						IType type = o as IType;
						if (type != null && (type.IsStatic || type.IsSealed || baseTypeNames.Contains (type.Name) || isInterface && type.ClassType != ClassType.Interface)) {
							continue;
						}
						if (o is Namespace && !namespaceList.Any (ns => ns.StartsWith (((Namespace)o).FullName)))
							continue;
						col.Add (o);
					}
					// Add inner classes
					Stack<IType> innerStack = new Stack<IType> ();
					innerStack.Push (cls);
					while (innerStack.Count > 0) {
						IType curType = innerStack.Pop ();
						if (curType == null)
							continue;
						foreach (IType innerType in curType.InnerTypes) {
							if (innerType != cls)
								// don't add the calling class as possible base type
								col.Add (innerType);
						}
						if (curType.DeclaringType != null)
							innerStack.Push (curType.DeclaringType);
					}
					return completionList;
				}
				break;
			case "is":
			case "as":
				
				{
					CompletionDataList completionList = new ProjectDomCompletionDataList ();
					ExpressionResult expressionResult = FindExpression (dom, completionContext, wordStart - textEditorData.Caret.Offset);
					NRefactoryResolver resolver = CreateResolver ();
					ResolveResult resolveResult = resolver.Resolve (expressionResult, new DomLocation (completionContext.TriggerLine, completionContext.TriggerLineOffset));
					if (resolveResult != null && resolveResult.ResolvedType != null) {
						CompletionDataCollector col = new CompletionDataCollector (dom, completionList, Document.CompilationUnit, resolver.CallingType, location);
						IType foundType = null;
						if (word == "as") {
							ExpressionContext exactContext = new NewCSharpExpressionFinder (dom).FindExactContextForAsCompletion (textEditorData, Document.CompilationUnit, Document.FileName, resolver.CallingType);
							if (exactContext is ExpressionContext.TypeExpressionContext) {
								foundType = resolver.SearchType (((ExpressionContext.TypeExpressionContext)exactContext).Type);
								AddAsCompletionData (col, foundType);
							}
						}
					
						if (foundType == null)
							foundType = resolver.SearchType (resolveResult.ResolvedType);
					
						if (foundType != null) {
							if (foundType.ClassType == ClassType.Interface)
								foundType = resolver.SearchType (DomReturnType.Object);
						
//.........这里部分代码省略.........

		ICompletionDataList CreateCaseCompletionData (DomLocation location, ExpressionResult expressionResult)
		{
			NRefactoryResolver resolver = CreateResolver ();
			
			resolver.SetupResolver (location);
			
			SwitchFinder switchFinder = new SwitchFinder (location);
			if (resolver.MemberCompilationUnit != null)
				switchFinder.VisitCompilationUnit (resolver.MemberCompilationUnit, null);
			CompletionDataList result = new ProjectDomCompletionDataList ();
			if (switchFinder.SwitchStatement == null)
				return result;
			ResolveResult resolveResult = resolver.ResolveExpression (switchFinder.SwitchStatement.SwitchExpression, location);
			IType type = dom.GetType (resolveResult.ResolvedType);
			if (type != null && type.ClassType == ClassType.Enum) {
				OutputFlags flags = OutputFlags.None;
				var declaringType = resolver.CallingType;
				if (declaringType != null && dom != null) {
					foreach (IType t in new List<IType>(dom.GetInheritanceTree (declaringType))) {
						if (t.SearchMember (type.Name, true).Any (m => m.MemberType != MonoDevelop.Projects.Dom.MemberType.Type)) {
							flags |= OutputFlags.UseFullName;
							break;
						}
					}
				}
//				if (!foundType && (NamePrefix.Length == 0 || !type.Namespace.StartsWith (NamePrefix)) && !type.Namespace.EndsWith ("." + NamePrefix) && type.DeclaringType == null && NamePrefix != null && !NamePrefix.Contains ("::"))
//					flags |= OutputFlags.UseFullName;
				CompletionDataCollector cdc = new CompletionDataCollector (dom, result, Document.CompilationUnit, resolver.CallingType, location);
				cdc.Add (type, flags);
			}
			return result;
		}

		/// <summary>
		/// Adds a type to completion list. If it's a simple type like System.String it adds the simple
		/// C# type name "string" as well.
		/// </summary>
		static void AddAsCompletionData (CompletionDataCollector col, IType type)
		{
			if (type == null)
				return;
			string netName = CSharpAmbience.NetToCSharpTypeName (type.FullName);
			if (!string.IsNullOrEmpty (netName) && netName != type.FullName)
				col.Add (netName);
			
			if (!String.IsNullOrEmpty (type.Namespace) && !col.IsNamespaceInScope (type.Namespace)) {
				string[] ns = type.Namespace.Split ('.');
				for (int i = 0; i < ns.Length; i++) {
					col.Add (new Namespace (ns[i]));
					if (!col.IsNamespaceInScope (ns[i]))
						return;
				}
			}
			
			col.Add (type);
		}

		static void AddNRefactoryKeywords (CompletionDataCollector col, System.Collections.BitArray keywords)
		{
			for (int i = 0; i < keywords.Length; i++) {
				if (keywords[i]) {
					string keyword = ICSharpCode.NRefactory.Parser.CSharp.Tokens.GetTokenString (i);
					if (keyword.IndexOf ('<') >= 0)
						continue;
					col.Add (keyword, "md-keyword");
				}
			}
		}

		CompletionDataList CreateCtrlSpaceCompletionData (CodeCompletionContext ctx, ExpressionResult expressionResult)
		{
			NRefactoryResolver resolver = CreateResolver ();
			DomLocation cursorLocation = new DomLocation (ctx.TriggerLine, ctx.TriggerLineOffset);
			resolver.SetupResolver (cursorLocation);
			CompletionDataList result = new ProjectDomCompletionDataList ();
			CompletionDataCollector col = new CompletionDataCollector (dom, result, Document.CompilationUnit, resolver.CallingType, cursorLocation);
			
			if (expressionResult == null) {
				AddPrimitiveTypes (col);
				resolver.AddAccessibleCodeCompletionData (ExpressionContext.Global, col);
			} else if (expressionResult.ExpressionContext == ExpressionContext.TypeDeclaration) {
				AddPrimitiveTypes (col);
				AddNRefactoryKeywords (col, ICSharpCode.NRefactory.Parser.CSharp.Tokens.TypeLevel);
				resolver.AddAccessibleCodeCompletionData (expressionResult.ExpressionContext, col);
			} else if (expressionResult.ExpressionContext == ExpressionContext.InterfaceDeclaration) {
				AddPrimitiveTypes (col);
				AddNRefactoryKeywords (col, ICSharpCode.NRefactory.Parser.CSharp.Tokens.InterfaceLevel);
				resolver.AddAccessibleCodeCompletionData (expressionResult.ExpressionContext, col);
			} else if (expressionResult.ExpressionContext == ExpressionContext.MethodBody) {
				col.Add ("global", "md-keyword");
				col.Add ("var", "md-keyword");
				AddNRefactoryKeywords (col, ICSharpCode.NRefactory.Parser.CSharp.Tokens.StatementStart);
				AddPrimitiveTypes (col);
				resolver.AddAccessibleCodeCompletionData (expressionResult.ExpressionContext, col);
			} else if (expressionResult.ExpressionContext == ExpressionContext.InterfacePropertyDeclaration) {
				col.Add ("get", "md-keyword");
				col.Add ("set", "md-keyword");
			} else if (expressionResult.ExpressionContext == ExpressionContext.ConstraintsStart) {
				col.Add ("where", "md-keyword");
			} else if (expressionResult.ExpressionContext == ExpressionContext.Constraints) {
				col.Add ("new", "md-keyword");
				col.Add ("class", "md-keyword");
				col.Add ("struct", "md-keyword");
				AddPrimitiveTypes (col);
				resolver.AddAccessibleCodeCompletionData (expressionResult.ExpressionContext, col);
			} else if (expressionResult.ExpressionContext == ExpressionContext.Attribute) {
				col.Add ("assembly", "md-keyword");
				col.Add ("module", "md-keyword");
				col.Add ("type", "md-keyword");
				col.Add ("method", "md-keyword");
				col.Add ("field", "md-keyword");
				col.Add ("property", "md-keyword");
				col.Add ("event", "md-keyword");
				col.Add ("param", "md-keyword");
				col.Add ("return", "md-keyword");
				resolver.AddAccessibleCodeCompletionData (expressionResult.ExpressionContext, col);
			} else if (expressionResult.ExpressionContext == ExpressionContext.BaseConstructorCall) {
				col.Add ("this", "md-keyword");
				col.Add ("base", "md-keyword");
			} else if (expressionResult.ExpressionContext == ExpressionContext.ParameterType || expressionResult.ExpressionContext == ExpressionContext.FirstParameterType) {
				col.Add ("ref", "md-keyword");
				col.Add ("out", "md-keyword");
				col.Add ("params", "md-keyword");
				// C# 3.0 extension method
				if (expressionResult.ExpressionContext == ExpressionContext.FirstParameterType)
					col.Add ("this", "md-keyword");
				AddPrimitiveTypes (col);
				resolver.AddAccessibleCodeCompletionData (expressionResult.ExpressionContext, col);
			} else if (expressionResult.ExpressionContext == ExpressionContext.PropertyDeclaration) {
				AddNRefactoryKeywords (col, ICSharpCode.NRefactory.Parser.CSharp.Tokens.InPropertyDeclaration);
			} else if (expressionResult.ExpressionContext == ExpressionContext.EventDeclaration) {
				col.Add ("add", "md-keyword");
				col.Add ("remove", "md-keyword");
			} //else if (expressionResult.ExpressionContext == ExpressionContext.FullyQualifiedType) {} 
			else if (expressionResult.ExpressionContext == ExpressionContext.Default) {
				col.Add ("global", "md-keyword");
				col.Add ("var", "md-keyword");
				AddPrimitiveTypes (col);
				AddNRefactoryKeywords (col, ICSharpCode.NRefactory.Parser.CSharp.Tokens.ExpressionStart);
				AddNRefactoryKeywords (col, ICSharpCode.NRefactory.Parser.CSharp.Tokens.ExpressionContent);
				resolver.AddAccessibleCodeCompletionData (expressionResult.ExpressionContext, col);
			} else if (expressionResult.ExpressionContext == ExpressionContext.Global) {
				AddNRefactoryKeywords (col, ICSharpCode.NRefactory.Parser.CSharp.Tokens.GlobalLevel);
				CodeTemplateService.AddCompletionDataForMime ("text/x-csharp", result);
			} else if (expressionResult.ExpressionContext == ExpressionContext.ObjectInitializer) {
				ExpressionContext exactContext = new NewCSharpExpressionFinder (dom).FindExactContextForObjectInitializer (textEditorData, resolver.Unit, Document.FileName, resolver.CallingType);
				if (exactContext is ExpressionContext.TypeExpressionContext) {
					IReturnType objectInitializer = ((ExpressionContext.TypeExpressionContext)exactContext).UnresolvedType;
					if (objectInitializer.ArrayDimensions > 0 || objectInitializer.PointerNestingLevel > 0) {
						col.Add ("global", "md-keyword");
						col.Add ("new", "md-keyword");
						AddPrimitiveTypes (col);
						resolver.AddAccessibleCodeCompletionData (expressionResult.ExpressionContext, col);
						return result;
					}
						
					IType foundType = resolver.SearchType (objectInitializer);
					if (foundType == null)
						foundType = dom.GetType (objectInitializer);
					
					if (foundType != null) {
						bool includeProtected = DomType.IncludeProtected (dom, foundType, resolver.CallingType);
						foreach (IType type in dom.GetInheritanceTree (foundType)) {
							foreach (IProperty property in type.Properties) {
								if (property.IsAccessibleFrom (dom, resolver.CallingType, resolver.CallingMember, includeProtected)) {
									col.Add (property);
								}
							}
							foreach (var field in type.Fields) {
//.........这里部分代码省略.........

//.........这里部分代码省略.........
						if (!String.IsNullOrEmpty (tag) && commentTags.IndexOf (tag) >= 0) {
							textEditorData.Insert (cursor, "</" + tag + ">");
							textEditorData.Caret.Offset = cursor; 
							return null;
						}
					}
				}
				return null;
/* Disabled because it gives problems when declaring arrays - for example string [] should not pop up code completion.
 			case '[':
				if (stateTracker.Engine.IsInsideDocLineComment || stateTracker.Engine.IsInsideOrdinaryCommentOrString)
					return null;
				result = FindExpression (dom, completionContext);
				if (result.ExpressionContext == ExpressionContext.Attribute)
					return CreateCtrlSpaceCompletionData (completionContext, result);
				return null;*/
			case '<':
				if (stateTracker.Engine.IsInsideDocLineComment) 
					return GetXmlDocumentationCompletionData ();
				return null;
			case '(':
				if (stateTracker.Engine.IsInsideDocLineComment || stateTracker.Engine.IsInsideOrdinaryCommentOrString)
					return null;
				result = FindExpression (dom, completionContext, -1);
				if (result == null || result.Expression == null)
					return null;
				resolver = CreateResolver ();
				resolveResult = resolver.Resolve (result, new DomLocation (completionContext.TriggerLine, completionContext.TriggerLineOffset - 2));
				
				if (resolveResult != null && resolver.ResolvedExpression is ICSharpCode.NRefactory.Ast.TypeOfExpression) {
					CompletionDataList completionList = new ProjectDomCompletionDataList ();
					
					CompletionDataCollector col = new CompletionDataCollector (dom, completionList, Document.CompilationUnit, resolver.CallingType, location);
					AddPrimitiveTypes (col);
					foreach (object o in dom.GetNamespaceContents (GetUsedNamespaces (), true, true)) {
						col.Add (o);
					}
					if (resolver.CallingMember is IMethod) {
						foreach (ITypeParameter tp in ((IMethod)resolver.CallingMember).TypeParameters) {
							col.Add (tp.Name, "md-keyword");
						}
					}
					if (resolver.CallingType != null) {
						foreach (ITypeParameter tp in resolver.CallingType.TypeParameters) {
							col.Add (tp.Name, "md-keyword");
						}
					}
					return completionList;
				}
				return null;
			case '/':
				cursor = textEditorData.IsSomethingSelected ? textEditorData.SelectionRange.Offset : textEditorData.Caret.Offset;
				if (cursor < 2)
					break;
					
				if (stateTracker.Engine.IsInsideDocLineComment) {
					string lineText = textEditorData.GetLineText (completionContext.TriggerLine);
					bool startsDocComment = true;
					int slashes = 0;
					for (int i = 0; i < completionContext.TriggerLineOffset && i < lineText.Length; i++) {
						if (lineText[i] == '/') {
							slashes++;
							continue;
						}
						if (!Char.IsWhiteSpace (lineText[i])) {
							startsDocComment = false;

		static void AddPrimitiveTypes (CompletionDataCollector col)
		{
			foreach (string primitiveType in primitiveTypes) {
				col.Add (primitiveType, "md-keyword");
			}
		}

		CompletionDataList CreateTypeCompletionData (DomLocation location, IType callingType, ExpressionContext context, IReturnType returnType, IReturnType returnTypeUnresolved)
		{
			CompletionDataList result = new ProjectDomCompletionDataList ();
			// "var o = new " needs special treatment.
			if (returnType == null && returnTypeUnresolved != null && returnTypeUnresolved.FullName == "var")
				returnType = returnTypeUnresolved = DomReturnType.Object;

			//	ExpressionContext.TypeExpressionContext tce = context as ExpressionContext.TypeExpressionContext;

			CompletionDataCollector col = new CompletionDataCollector (dom, result, Document.CompilationUnit, callingType, location);
			IType type = null;
			if (returnType != null)
				type = dom.GetType (returnType);
			if (type == null)
				type = dom.SearchType (Document.CompilationUnit, (MonoDevelop.Projects.Dom.INode)Document.CompilationUnit ?? callingType, returnTypeUnresolved);
			
			// special handling for nullable types: Bug 674516 - new completion for nullables should not include "Nullable"
			if (type is InstantiatedType && ((InstantiatedType)type).UninstantiatedType.FullName == "System.Nullable" && ((InstantiatedType)type).GenericParameters.Count == 1) {
				var genericParameter = ((InstantiatedType)type).GenericParameters[0];
				returnType = returnTypeUnresolved = Document.CompilationUnit.ShortenTypeName (genericParameter, location);
				type = dom.SearchType (Document.CompilationUnit, (MonoDevelop.Projects.Dom.INode)Document.CompilationUnit ?? callingType, genericParameter);
			}
			
			if (type == null || !(type.IsAbstract || type.ClassType == ClassType.Interface)) {
				if (type == null || type.ConstructorCount == 0 || type.Methods.Any (c => c.IsConstructor && c.IsAccessibleFrom (dom, callingType, type, callingType != null && dom.GetInheritanceTree (callingType).Any (x => x.FullName == type.FullName)))) {
					if (returnTypeUnresolved != null) {
						col.FullyQualify = true;
						CompletionData unresovedCompletionData = col.Add (returnTypeUnresolved);
						col.FullyQualify = false;
						// don't set default completion string for arrays, since it interferes with: 
						// string[] arr = new string[] vs new { "a"}
						if (returnTypeUnresolved.ArrayDimensions == 0)
							result.DefaultCompletionString = StripGenerics (unresovedCompletionData.CompletionText);
					} else {
						CompletionData unresovedCompletionData = col.Add (returnType);
						if (returnType.ArrayDimensions == 0)
							result.DefaultCompletionString = StripGenerics (unresovedCompletionData.CompletionText);
					}
				}
			}
			
			//				if (tce != null && tce.Type != null) {
			//					result.DefaultCompletionString = StripGenerics (col.AddCompletionData (result, tce.Type).CompletionString);
			//				} 
			//			else {
			//			}
			if (type == null)
				return result;
			HashSet<string> usedNamespaces = new HashSet<string> (GetUsedNamespaces ());
			if (type.FullName == DomReturnType.Object.FullName) 
				AddPrimitiveTypes (col);
			
			foreach (IType curType in dom.GetSubclasses (type)) {
				if (context != null && context.FilterEntry (curType))
					continue;
				if ((curType.TypeModifier & TypeModifier.HasOnlyHiddenConstructors) == TypeModifier.HasOnlyHiddenConstructors)
					continue;
				if (usedNamespaces.Contains (curType.Namespace)) {
					if (curType.ConstructorCount > 0) {
						if (!(curType.Methods.Any (c => c.IsConstructor && c.IsAccessibleFrom (dom, curType, callingType, callingType != null && dom.GetInheritanceTree (callingType).Any (x => x.FullName == curType.FullName)))))
							continue;
					}
					col.Add (curType);
				} else {
					string nsName = curType.Namespace;
					int idx = nsName.IndexOf ('.');
					if (idx >= 0)
						nsName = nsName.Substring (0, idx);
					col.Add (new Namespace (nsName));
				}
			}
			
			// add aliases
			if (returnType != null) {
				foreach (IUsing u in Document.CompilationUnit.Usings) {
					foreach (KeyValuePair<string, IReturnType> alias in u.Aliases) {
						if (alias.Value.ToInvariantString () == returnType.ToInvariantString ())
							result.Add (alias.Key, "md-class");
					}
				}
			}
			return result;
		}

		ICompletionDataList CreateCompletionData (DomLocation location, ResolveResult resolveResult, 
		                                          ExpressionResult expressionResult, NRefactoryResolver resolver)
		{
			if (resolveResult == null || expressionResult == null || dom == null)
				return null;
			CompletionDataList result = new ProjectDomCompletionDataList ();
			IEnumerable<object> objects = resolveResult.CreateResolveResult (dom, resolver != null ? resolver.CallingMember : null);
			CompletionDataCollector col = new CompletionDataCollector (dom, result, Document.CompilationUnit, resolver != null ? resolver.CallingType : null, location);
			col.HideExtensionParameter = !resolveResult.StaticResolve;
			col.NamePrefix = expressionResult.Expression;
			bool showOnlyTypes = expressionResult.Contexts.Any (ctx => ctx == ExpressionContext.InheritableType || ctx == ExpressionContext.Constraints);
			if (objects != null) {
				foreach (object obj in objects) {
					if (expressionResult.ExpressionContext != null && expressionResult.ExpressionContext.FilterEntry (obj))
						continue;
					if (expressionResult.ExpressionContext == ExpressionContext.NamespaceNameExcepted && !(obj is Namespace))
						continue;
					if (showOnlyTypes && !(obj is IType))
						continue;
					CompletionData data = col.Add (obj);
					if (data != null && expressionResult.ExpressionContext == ExpressionContext.Attribute && data.CompletionText != null && data.CompletionText.EndsWith ("Attribute")) {
						string newText = data.CompletionText.Substring (0, data.CompletionText.Length - "Attribute".Length);
						data.SetText (newText);
					}
				}
			}
			
			return result;
		}

		ICompletionDataList CreateCaseCompletionData (DomLocation location, ExpressionResult expressionResult)
		{
			NRefactoryResolver resolver = CreateResolver ();
			
			resolver.SetupResolver (location);
			
			SwitchFinder switchFinder = new SwitchFinder (location);
			if (resolver.MemberCompilationUnit != null)
				switchFinder.VisitCompilationUnit (resolver.MemberCompilationUnit, null);
			CompletionDataList result = new ProjectDomCompletionDataList ();
			if (switchFinder.SwitchStatement == null)
				return result;
			ResolveResult resolveResult = resolver.ResolveExpression (switchFinder.SwitchStatement.SwitchExpression, location);
			IType type = dom.GetType (resolveResult.ResolvedType);
			if (type != null && type.ClassType == ClassType.Enum) {
				CompletionDataCollector cdc = new CompletionDataCollector (dom, result, Document.CompilationUnit, resolver.CallingType, location);
				cdc.Add (type);
			}
			return result;
		}

        public override ICompletionDataList HandleCodeCompletion(CodeCompletionContext completionContext, char completionChar, ref int triggerWordLength)
        {
            //		IDisposable timer = null;
            try {
            if (dom == null /*|| Document.CompilationUnit == null*/)
                return null;
            if (completionChar != '#' && stateTracker.Engine.IsInsidePreprocessorDirective)
                return null;
            //	timer = Counters.ResolveTime.BeginTiming ();
            DomLocation location = new DomLocation (completionContext.TriggerLine, completionContext.TriggerLineOffset - 1);
            stateTracker.UpdateEngine ();
            ExpressionResult result;
            int cursor, newCursorOffset = 0;
            switch (completionChar) {
            case ':':
            case '.':
                if (stateTracker.Engine.IsInsideDocLineComment || stateTracker.Engine.IsInsideOrdinaryCommentOrString)
                    return null;
                result = FindExpression (dom, completionContext);
                if (result == null || result.Expression == null)
                    return null;
                int idx = result.Expression.LastIndexOf ('.');
                if (idx > 0)
                    result.Expression = result.Expression.Substring (0, idx);
                NRefactoryResolver resolver = new NRefactoryResolver (dom, Document.CompilationUnit, ICSharpCode.NRefactory.SupportedLanguage.CSharp, Editor, Document.FileName);
                ResolveResult resolveResult = resolver.Resolve (result, location);
                if (resolver.ResolvedExpression is ICSharpCode.NRefactory.Ast.PrimitiveExpression) {
                    ICSharpCode.NRefactory.Ast.PrimitiveExpression pex = (ICSharpCode.NRefactory.Ast.PrimitiveExpression)resolver.ResolvedExpression;
                    if (!tryToForceCompletion && !(pex.Value is string || pex.Value is char || pex.Value is bool))
                        return null;
                }

                return CreateCompletionData (location, resolveResult, result, resolver);
            case '#':
                if (stateTracker.Engine.IsInsidePreprocessorDirective)
                    return GetDirectiveCompletionData ();
                return null;
            case '>':
                cursor = Editor.SelectionStartPosition;

                if (stateTracker.Engine.IsInsideDocLineComment) {
                    string lineText = Editor.GetLineText (completionContext.TriggerLine);
                    int startIndex = Math.Min (completionContext.TriggerLineOffset - 1, lineText.Length - 1);

                    while (startIndex >= 0 && lineText[startIndex] != '<') {
                        --startIndex;
                        if (lineText[startIndex] == '/') { // already closed.
                            startIndex = -1;
                            break;
                        }
                    }

                    if (startIndex >= 0) {
                        int endIndex = startIndex;
                        while (endIndex <= completionContext.TriggerLineOffset && endIndex < lineText.Length && !Char.IsWhiteSpace (lineText[endIndex])) {
                            endIndex++;
                        }
                        string tag = endIndex - startIndex - 1 > 0 ? lineText.Substring (startIndex + 1, endIndex - startIndex - 2) : null;
                        if (!String.IsNullOrEmpty (tag) && commentTags.IndexOf (tag) >= 0) {
                            Editor.InsertText (cursor, "</" + tag + ">");
                            Editor.CursorPosition = cursor;
                            return null;
                        }
                    }
                }
                return null;
            /* Disabled because it gives problems when declaring arrays - for example string [] should not pop up code completion.
             			case '[':
                if (stateTracker.Engine.IsInsideDocLineComment || stateTracker.Engine.IsInsideOrdinaryCommentOrString)
                    return null;
                result = FindExpression (dom, completionContext);
                if (result.ExpressionContext == ExpressionContext.Attribute)
                    return CreateCtrlSpaceCompletionData (completionContext, result);
                return null;*/
            case '<':
                if (stateTracker.Engine.IsInsideDocLineComment)
                    return GetXmlDocumentationCompletionData ();
                return null;
            case '(':
                if (stateTracker.Engine.IsInsideDocLineComment || stateTracker.Engine.IsInsideOrdinaryCommentOrString)
                    return null;
                result = FindExpression (dom, completionContext, -1);
                if (result == null || result.Expression == null)
                    return null;
                resolver = new NRefactoryResolver (dom, Document.CompilationUnit, ICSharpCode.NRefactory.SupportedLanguage.CSharp, Editor, Document.FileName);
                resolveResult = resolver.Resolve (result, new DomLocation (completionContext.TriggerLine, completionContext.TriggerLineOffset - 2));

                if (resolveResult != null && resolver.ResolvedExpression is ICSharpCode.NRefactory.Ast.TypeOfExpression) {
                    CompletionDataList completionList = new ProjectDomCompletionDataList ();

                    CompletionDataCollector col = new CompletionDataCollector (completionList, Document.CompilationUnit, location);
                    AddPrimitiveTypes (col);
                    foreach (object o in dom.GetNamespaceContents (GetUsedNamespaces (), true, true)) {
                        col.Add (o);
                    }
                    return completionList;
                }
                return null;
            case '/':
                cursor = Editor.SelectionStartPosition;
//.........这里部分代码省略.........

        CompletionDataList CreateTypeCompletionData(DomLocation location, IType callingType, ExpressionContext context, IReturnType returnType, IReturnType returnTypeUnresolved)
        {
            CompletionDataList result = new ProjectDomCompletionDataList ();
            // "var o = new " needs special treatment.
            if (returnType == null && returnTypeUnresolved != null && returnTypeUnresolved.FullName == "var")
                returnType = returnTypeUnresolved = DomReturnType.Object;

            //	ExpressionContext.TypeExpressionContext tce = context as ExpressionContext.TypeExpressionContext;

            CompletionDataCollector col = new CompletionDataCollector (result, Document.CompilationUnit, location);
            IType type = null;
            if (returnType != null)
                type = dom.GetType (returnType);
            if (type == null)
                type = dom.SearchType (new SearchTypeRequest (Document.CompilationUnit, returnTypeUnresolved, null));

            if (type == null || !(type.IsAbstract || type.ClassType == ClassType.Interface)) {
                if (type == null || type.ConstructorCount == 0 || type.Methods.Any (c => c.IsConstructor && c.IsAccessibleFrom (dom, callingType, type, callingType != null && dom.GetInheritanceTree (callingType).Any (x => x.FullName == type.FullName)))) {
                    if (returnTypeUnresolved != null) {
                        col.FullyQualify = true;
                        ICompletionData unresovedCompletionData = col.Add (returnTypeUnresolved);
                        col.FullyQualify = false;
                        result.DefaultCompletionString = StripGenerics (unresovedCompletionData.CompletionText);
                    } else {
                        ICompletionData unresovedCompletionData = col.Add (returnType);
                        result.DefaultCompletionString = StripGenerics (unresovedCompletionData.CompletionText);
                    }
                }
            }
            //				if (tce != null && tce.Type != null) {
            //					result.DefaultCompletionString = StripGenerics (col.AddCompletionData (result, tce.Type).CompletionString);
            //				}
            //			else {
            //			}

            if (type == null)
                return result;
            HashSet<string> usedNamespaces = new HashSet<string> (GetUsedNamespaces ());
            if (type.FullName == DomReturnType.Object.FullName)
                AddPrimitiveTypes (col);
            foreach (IType curType in dom.GetSubclasses (type)) {
                if (context != null && context.FilterEntry (curType))
                    continue;
                if ((curType.TypeModifier & TypeModifier.HasOnlyHiddenConstructors) == TypeModifier.HasOnlyHiddenConstructors)
                    continue;
                if (usedNamespaces.Contains (curType.Namespace)) {
                    if (curType.ConstructorCount > 0) {
                        if (!(curType.Methods.Any (c => c.IsConstructor && c.IsAccessibleFrom (dom, curType, callingType, callingType != null && dom.GetInheritanceTree (callingType).Any (x => x.FullName == curType.FullName)))))
                            continue;
                    }
                    col.Add (curType);
                } else {
                    string nsName = curType.Namespace;
                    int idx = nsName.IndexOf ('.');
                    if (idx >= 0)
                        nsName = nsName.Substring (0, idx);
                    col.Add (new Namespace (nsName));
                }
            }

            // add aliases
            if (returnType != null) {
                foreach (IUsing u in Document.CompilationUnit.Usings) {
                    foreach (KeyValuePair<string, IReturnType> alias in u.Aliases) {
                        if (alias.Value.ToInvariantString () == returnType.ToInvariantString ())
                            result.Add (alias.Key, "md-class");
                    }
                }
            }
            return result;
        }