C# Microsoft.VisualStudio.Debugger.Metadata.Type.GetNullableTypeArgument方法代码示例

        /// <summary>
        /// Append the qualified name (i.e. including containing types and namespaces) of a named,
        /// pointer, or array type to <paramref name="builder"/>.
        /// </summary>
        /// <remarks>
        /// Keyword strings are appended for primitive types (e.g. "int" for "System.Int32").
        /// Question mark syntax is used for <see cref="Nullable{T}"/>.
        /// No special handling is required for anonymous types - they are expected to be
        /// emitted with <see cref="DebuggerDisplayAttribute.Type"/> set to "&lt;Anonymous Type&gt;.
        /// This is fortunate, since we don't have a good way to recognize them in metadata.
        /// Does not call itself (directly).
        /// </remarks>
        protected void AppendQualifiedTypeName(
            StringBuilder builder,
            Type type,
            DynamicFlagsCustomTypeInfo dynamicFlags,
            ref int index,
            bool escapeKeywordIdentifiers,
            out bool sawInvalidIdentifier)
        {
            Type originalType = type;

            // Can have an array of pointers, but not a pointer to an array, so consume these first.
            // We'll reconstruct this information later from originalType.
            while (type.IsArray)
            {
                index++;
                type = type.GetElementType();
            }

            int pointerCount = 0;
            while (type.IsPointer)
            {
                var elementType = type.GetElementType();
                if (elementType == null)
                {
                    // Null for function pointers.
                    break;
                }
                index++;
                pointerCount++;
                type = elementType;
            }

            int nullableCount = 0;
            Type typeArg;
            while ((typeArg = type.GetNullableTypeArgument()) != null)
            {
                index++;
                nullableCount++;
                type = typeArg;
            }
            Debug.Assert(nullableCount < 2, "Benign: someone is nesting nullables.");

            Debug.Assert(pointerCount == 0 || nullableCount == 0, "Benign: pointer to nullable?");

            int oldLength = builder.Length;
            AppendQualifiedTypeNameInternal(builder, type, dynamicFlags, ref index, escapeKeywordIdentifiers, out sawInvalidIdentifier);
            string name = builder.ToString(oldLength, builder.Length - oldLength);

            builder.Append('?', nullableCount);
            builder.Append('*', pointerCount);

            type = originalType;
            while (type.IsArray)
            {
                AppendRankSpecifier(builder, type.GetArrayRank());

                type = type.GetElementType();
            }
        }

        internal EvalResultDataItem CreateDataItem(
            DkmInspectionContext inspectionContext,
            string name,
            Type typeDeclaringMember,
            Type declaredType,
            DkmClrValue value,
            EvalResultDataItem parent,
            ExpansionFlags expansionFlags,
            bool childShouldParenthesize,
            string fullName,
            ReadOnlyCollection<string> formatSpecifiers,
            DkmEvaluationResultCategory category,
            DkmEvaluationResultFlags flags,
            DkmEvaluationFlags evalFlags)
        {
            if ((evalFlags & DkmEvaluationFlags.ShowValueRaw) != 0)
            {
                formatSpecifiers = Formatter.AddFormatSpecifier(formatSpecifiers, "raw");
            }

            Expansion expansion;
            // If the declared type is Nullable<T>, the value should
            // have no expansion if null, or be expanded as a T.
            var lmrNullableTypeArg = declaredType.GetNullableTypeArgument();
            if (lmrNullableTypeArg != null && !value.HasExceptionThrown(parent))
            {
                Debug.Assert(value.Type.GetProxyType() == null);

                var nullableValue = value.GetNullableValue();
                if (nullableValue == null)
                {
                    Debug.Assert(declaredType.Equals(value.Type.GetLmrType()));
                    // No expansion of "null".
                    expansion = null;
                }
                else
                {
                    value = nullableValue;
                    Debug.Assert(lmrNullableTypeArg.Equals(value.Type.GetLmrType())); // If this is not the case, add a test for includeRuntimeTypeIfNecessary.
                    expansion = this.GetTypeExpansion(inspectionContext, lmrNullableTypeArg, value, ExpansionFlags.IncludeResultsView);
                }
            }
            else if (value.IsError() || (inspectionContext.EvaluationFlags & DkmEvaluationFlags.NoExpansion) != 0)
            {
                expansion = null;
            }
            else
            {
                expansion = DebuggerTypeProxyExpansion.CreateExpansion(
                    this,
                    inspectionContext,
                    name,
                    typeDeclaringMember,
                    declaredType,
                    value,
                    childShouldParenthesize,
                    fullName,
                    flags.Includes(DkmEvaluationResultFlags.ExceptionThrown) ? null : fullName,
                    formatSpecifiers,
                    flags,
                    this.Formatter.GetEditableValue(value));
                if (expansion == null)
                {
                    var expansionType = value.HasExceptionThrown(parent) ? value.Type.GetLmrType() : declaredType;
                    expansion = this.GetTypeExpansion(inspectionContext, expansionType, value, expansionFlags);
                }
            }

            return new EvalResultDataItem(
                name,
                typeDeclaringMember,
                declaredType,
                value,
                expansion,
                childShouldParenthesize,
                fullName,
                flags.Includes(DkmEvaluationResultFlags.ExceptionThrown) ? null : fullName,
                formatSpecifiers,
                category,
                flags,
                this.Formatter.GetEditableValue(value));
        }