Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / TypeGenericEnumerableViewSchema.cs / 2 / TypeGenericEnumerableViewSchema.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.Design { using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Globalization; using System.Reflection; ////// Represents a View's schema based on a generic IEnumerable. The /// strongly-typed row type is determined based on the generic argument /// of the enumerable. /// [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] internal sealed class TypeGenericEnumerableViewSchema : BaseTypeViewSchema { public TypeGenericEnumerableViewSchema(string viewName, Type type) : base(viewName, type) { Debug.Assert(TypeSchema.IsBoundGenericEnumerable(type), String.Format(CultureInfo.InvariantCulture, "The type '{0}' does not implement System.Collections.Generic.IEnumerable, or the argument T is not bound to a type.", type.FullName)); } protected override Type GetRowType(Type objectType) { // Get the IEnumerable declaration Type enumerableType = null; if (objectType.IsInterface && objectType.IsGenericType && objectType.GetGenericTypeDefinition() == typeof(IEnumerable<>)) { // If the type already is IEnumerable , that's the interface we want to inspect enumerableType = objectType; } else { // Otherwise we get a list of all the interafaces the type implements Type[] interfaces = objectType.GetInterfaces(); foreach (Type i in interfaces) { if (i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IEnumerable<>)) { enumerableType = i; break; } } } Debug.Assert(enumerableType != null, "Should have found an implementation of IEnumerable "); // Now return the value of the T argument Type[] genericArguments = enumerableType.GetGenericArguments(); Debug.Assert(genericArguments != null && genericArguments.Length == 1, "Expected IEnumerable to have a generic argument"); // If a type has IsGenericParameter=true that means it is not bound. if (genericArguments[0].IsGenericParameter) { Debug.Fail("Expected the type argument to IEnumerable to be bound"); return null; } else { return genericArguments[0]; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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