C# Binder.CompositeNode类代码示例

		/// <summary>
		/// 
		/// </summary>
		/// <param name="root"></param>
		/// <param name="reader"></param>
		/// <param name="prefix"></param>
		public void PopulateTree(CompositeNode root, IDataReader reader, String prefix)
		{
			string[] fields = GetFields(reader);

			int[] indexesToSkip = FindDuplicateFields(fields);
			
			IndexedNode indexNode = new IndexedNode(prefix);
			
			int row = 0;

			while(reader.Read())
			{
				CompositeNode node = new CompositeNode(row.ToString());

				for(int i=0; i<reader.FieldCount; i++)
				{
					// Is in the skip list?
					if (Array.IndexOf(indexesToSkip, i) >= 0) continue;
					
					// Is null?
					if (reader.IsDBNull(i)) continue;
					
					Type fieldType = reader.GetFieldType(i);
					
					node.AddChildNode(new LeafNode(fieldType, fields[i], reader.GetValue(i)));
				}

				indexNode.AddChildNode(node);
			
				row++;
			}
			
			root.AddChildNode(indexNode);
		}

		public CompositeNode BuildNode(XDocument doc)
		{
			var rootNode = new CompositeNode("root");
			rootNode.AddChildNode(ProcessElement(doc.Root));
			return rootNode;

		}

		public void PopulateTree(CompositeNode root, NameValueCollection nameValueCollection)
		{
			foreach (String key in nameValueCollection.Keys)
			{
				if (key == null) continue;
				string singleKeyName = NormalizeKey(key);
				String[] values = nameValueCollection.GetValues(key);

				if (values == null) continue;

				if (values.Length == 1 && key.EndsWith("[]"))
				{
					if (values[0] == string.Empty)
					{
						ProcessNode(root, typeof (String[]), singleKeyName, new string[0]);
					}
					else
					{
						values = values[0].Split(',');
						ProcessNode(root, typeof (String[]), singleKeyName, values);
					}
				}
				else if (values.Length == 1)
				{
					ProcessNode(root, typeof (String), key, values[0]);
				}
				else
				{
					ProcessNode(root, typeof (String[]), singleKeyName, values);
				}
			}
		}

		public bool CanBindParameter(Type desiredType, String paramName, CompositeNode treeRoot)
		{
			bool canConvert;

			Node childNode = treeRoot.GetChildNode(paramName);

			if (childNode != null)
			{
				canConvert = true;
			}
			else if (desiredType == typeof (DateTime))
			{
				TrySpecialDateTimeBinding(desiredType, treeRoot, paramName, out canConvert);
			}
			else if (desiredType == typeof(DateTimeOffset))
			{
				TrySpecialDateTimeOffsetBinding(desiredType, treeRoot, paramName, out canConvert);
			}
			else
			{
				canConvert = false;
			}

			return canConvert;
		}

		public Node ProcessElement(XElement startEl)
		{
			if (IsComplex(startEl))
			{
				CompositeNode top = new CompositeNode(startEl.Name.LocalName);
				foreach (var attr in startEl.Attributes())
				{
					var leaf = new LeafNode(typeof(String), attr.Name.LocalName, attr.Value);
					top.AddChildNode(leaf);
				}
				foreach (var childEl in startEl.Elements())
				{
					var childNode = ProcessElement(childEl);
					top.AddChildNode(childNode);
				}

				return top;
			}
			else
			{
				LeafNode top = new LeafNode(typeof(String), "", "");
				return top;
			}

			
		}

		private static CompositeNode GetParamsNode(int expectedValue)
		{
			CompositeNode paramsNode = new CompositeNode("root");
			IndexedNode listNode = new IndexedNode("myList");
			paramsNode.AddChildNode(listNode);
			listNode.AddChildNode(new LeafNode(typeof(int), "", expectedValue));
			return paramsNode;
		}

		public CompositeNode BuildSourceNode(NameValueCollection nameValueCollection)
		{
			var root = new CompositeNode("root");

			PopulateTree(root, nameValueCollection);

			return root;
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="reader"></param>
		/// <param name="prefix"></param>
		/// <returns></returns>
		public CompositeNode BuildSourceNode(IDataReader reader, String prefix)
		{
			CompositeNode root = new CompositeNode("root");
			
			PopulateTree(root, reader, prefix);
			
			return root;
		}

		private object ConvertToSimpleValue(Type desiredType, string key, CompositeNode parent, out bool conversionSucceeded)
		{
			conversionSucceeded = false;

			Node childNode = parent.GetChildNode(key);

			if (childNode == null && IsDateTimeType(desiredType))
			{
				return TrySpecialDateTimeBinding(desiredType, parent, key, out conversionSucceeded);
			}
			else if (childNode == null)
			{
				return null;
			}
			else if (childNode.NodeType == NodeType.Leaf)
			{
				return ConvertLeafNode(desiredType, (LeafNode) childNode, out conversionSucceeded);
			}
			else
			{
				throw new BindingException("Could not convert param as the node related " +
				                           "to the param is not a leaf node. Param {0} parent node: {1}", key, parent.Name);
			}
		}

		protected virtual void BeforeBindingProperty(object instance, PropertyInfo prop, string prefix, CompositeNode node)
		{
		}

		protected bool CheckForValidationFailures(object instance, Type instanceType,
		                                          PropertyInfo prop, CompositeNode node,
		                                          string name, string prefix,
		                                          ErrorSummary summary)
		{
			object value = null;

			if (validator == null)
			{
				return false;
			}

			IValidator[] validators = validator.GetValidators(instanceType, prop);

			if (validators.Length != 0)
			{
				Node valNode = node.GetChildNode(name);

				if (valNode != null && valNode.NodeType == NodeType.Leaf)
				{
					value = ((LeafNode)valNode).Value;
				}

				if (value == null && IsDateTimeType(prop.PropertyType))
				{
					bool conversionSucceeded;
					value = TryGetDateWithUTCFormat(node, name, out conversionSucceeded);
				}

				if (value == null && valNode == null)
				{
					// Value was not present on the data source. Skip validation
					return false;
				}
			}

			return CheckForValidationFailures(instance, instanceType, prop, value, name, prefix, summary);
		}

		protected void InternalRecursiveBindObjectInstance(object instance, String prefix, CompositeNode node)
		{
			if (node == null || instance == null)
			{
				return;
			}

			BeforeBinding(instance, prefix, node);

			if (PerformCustomBinding(instance, prefix, node))
			{
				return;
			}

			PushInstance(instance, prefix);

			ErrorSummary summary = new ErrorSummary();

			validationErrorSummaryPerInstance[instance] = summary;

			Type instanceType = instance.GetType();

			PropertyInfo[] props = instanceType.GetProperties(PropertiesBindingFlags);

			string nodeFullName = node.FullName;

			foreach(PropertyInfo prop in props)
			{
				if (ShouldIgnoreProperty(prop, nodeFullName))
				{
					continue;
				}

				Type propType = prop.PropertyType;
				String paramName = prop.Name;

				String translatedParamName = Translate(instanceType, paramName);

				if (translatedParamName == null)
				{
					continue;
				}

				bool isSimpleProperty = IsSimpleProperty(propType);

				// There are some caveats by running the validators here. 
				// We should follow the validator's execution order...
				if (isSimpleProperty)
				{
					if (CheckForValidationFailures(instance, instanceType, prop, node, translatedParamName, prefix, summary))
					{
						continue;
					}
				}

				BeforeBindingProperty(instance, prop, prefix, node);

				try
				{
					bool conversionSucceeded;

					if (isSimpleProperty)
					{
						object value = ConvertToSimpleValue(propType, translatedParamName, node, out conversionSucceeded);

						if (conversionSucceeded)
						{
							SetPropertyValue(instance, prop, value);
						}
					}
					else
					{
						// if the property is an object, we look if it is already instanciated
						object value = prop.GetValue(instance, null);

						Node nestedNode = node.GetChildNode(paramName);

						if (nestedNode != null)
						{
							if (ShouldRecreateInstance(value, propType, paramName, nestedNode))
							{
								value = InternalBindObject(propType, paramName, nestedNode, out conversionSucceeded);

								if (conversionSucceeded)
								{
									SetPropertyValue(instance, prop, value);
								}
							}
							else
							{
								InternalRecursiveBindObjectInstance(value, paramName, nestedNode);
							}
						}

						CheckForValidationFailures(instance, instanceType, prop, value, translatedParamName, prefix, summary);
					}
				}
				catch(Exception ex)
				{
					errors.Add(new DataBindError(prefix, prop.Name, ex));
//.........这里部分代码省略.........

		private IndexedNode GetOrCreateIndexedNode(CompositeNode parent, string nodeName)
		{
			Node node = parent.GetChildNode(nodeName);

			if (node != null && node.NodeType != NodeType.Indexed)
			{
				throw new BindingException("Attempt to create or obtain an indexed node " +
				                           "named {0}, but a node with the same exists with the type {1}", nodeName, node.NodeType);
			}

			if (node == null)
			{
				node = new IndexedNode(nodeName);
				parent.AddChildNode(node);
			}

			return (IndexedNode) node;
		}

		private bool IsPropertyExpected(PropertyInfo prop, CompositeNode node)
		{
			var propId = string.Format("{0}.{1}", node.FullName, prop.Name);

			if (expectCollPropertiesList != null)
			{
				return Array.BinarySearch(expectCollPropertiesList, propId, CaseInsensitiveComparer.Default) >= 0;
			}

			return false;
		}

		public object BindObject(Type targetType, string prefix, string exclude, string allow, string expect,
								 CompositeNode treeRoot)
		{
			expectCollPropertiesList = CreateNormalizedList(expect);

			return BindObject(targetType, prefix, exclude, allow, treeRoot);
		}