Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Compilation / ObjectFactoryCodeDomTreeGenerator.cs / 1 / ObjectFactoryCodeDomTreeGenerator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- // This code is used to optimize the instantiation of generated types. namespace System.Web.Compilation { using System; using System.Collections; using System.Reflection; using System.Security.Permissions; using System.Globalization; using System.CodeDom; using System.CodeDom.Compiler; using System.Web.Util; using Util = System.Web.UI.Util; internal delegate object InstantiateObject(); internal class ObjectFactoryCodeDomTreeGenerator { private CodeCompileUnit _codeCompileUnit; private CodeTypeDeclaration _factoryClass; private const string factoryClassNameBase = "FastObjectFactory_"; private const string factoryFullClassNameBase = BaseCodeDomTreeGenerator.internalAspNamespace + "." + factoryClassNameBase; internal ObjectFactoryCodeDomTreeGenerator(string outputAssemblyName) { _codeCompileUnit = new CodeCompileUnit(); CodeNamespace sourceDataNamespace = new CodeNamespace( BaseCodeDomTreeGenerator.internalAspNamespace); _codeCompileUnit.Namespaces.Add(sourceDataNamespace); // Make the class name vary based on the assembly (VSWhidbey 363214) string factoryClassName = factoryClassNameBase + Util.MakeValidTypeNameFromString(outputAssemblyName).ToLower(CultureInfo.InvariantCulture); // Create a single class, in which a method will be added for each // type that needs to be fast created in this assembly _factoryClass = new CodeTypeDeclaration(factoryClassName); // Make the class internal (VSWhidbey 363214) _factoryClass.TypeAttributes &= ~TypeAttributes.Public; // We generate a dummy line pragma, just so it will end with a '#line hidden' // and prevent the following generated code from ever being treated as user // code. We need to use this hack because CodeDOM doesn't allow simply generating // a '#line hidden'. (VSWhidbey 199384) CodeSnippetTypeMember dummySnippet = new CodeSnippetTypeMember(String.Empty); #if !PLATFORM_UNIX /// Unix file system // CORIOLISTODO: Unix file system dummySnippet.LinePragma = new CodeLinePragma(@"c:\\dummy.txt", 1); #else // !PLATFORM_UNIX dummySnippet.LinePragma = new CodeLinePragma(@"/dummy.txt", 1); #endif // !PLATFORM_UNIX _factoryClass.Members.Add(dummySnippet); // Add a private default ctor to make the class non-instantiatable (VSWhidbey 340829) CodeConstructor ctor = new CodeConstructor(); ctor.Attributes |= MemberAttributes.Private; _factoryClass.Members.Add(ctor); sourceDataNamespace.Types.Add(_factoryClass); } internal void AddFactoryMethod(string typeToCreate) { // Generate a simple factory method for this type. e.g. // static object Create_Acme_Foo() { // return new ASP.foo_aspx(); // } CodeMemberMethod method = new CodeMemberMethod(); method.Name = GetCreateMethodNameForType(typeToCreate); method.ReturnType = new CodeTypeReference(typeof(object)); method.Attributes = MemberAttributes.Static; CodeMethodReturnStatement cmrs = new CodeMethodReturnStatement( new CodeObjectCreateExpression(typeToCreate)); method.Statements.Add(cmrs); _factoryClass.Members.Add(method); } private static string GetCreateMethodNameForType(string typeToCreate) { return "Create_" + Util.MakeValidTypeNameFromString(typeToCreate); } internal CodeCompileUnit CodeCompileUnit { get { return _codeCompileUnit; } } // Get the factory delegate for this type // Could be called with user code on the stack, so need to assert here // e.g. This can happen during a Server.Transfer, or a LoadControl. [ReflectionPermission(SecurityAction.Assert, Flags = ReflectionPermissionFlag.MemberAccess)] internal static InstantiateObject GetFastObjectCreationDelegate(Type t) { // Look for the factory class in the same assembly Assembly a = t.Assembly; string shortAssemblyName = Util.GetAssemblyShortName(t.Assembly); shortAssemblyName = shortAssemblyName.ToLower(CultureInfo.InvariantCulture); Type factoryType = a.GetType(factoryFullClassNameBase + Util.MakeValidTypeNameFromString(shortAssemblyName)); if (factoryType == null) return null; string methodName = GetCreateMethodNameForType(t.FullName); try { return (InstantiateObject) Delegate.CreateDelegate( typeof(InstantiateObject), factoryType, methodName); } catch { return null; } } } }
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