Marshal.GenerateGuidForType(Type)和Type.GUID之间有什么区别?

问题描述

Type classType = typeof(SomeClass);
bool equal = Marshal.GenerateGuidForType(classType) == classType.GUID;

我还没有发现没有通过这种情况的案件.

I haven't found a case that fail this condition.

所以为什么和何时我应该使用 Marshal 方法，而不是简单地获取 GUID 属性?

So why and when should I use the Marshal method instead of simply getting the GUID property?

推荐答案

请参见 http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.generateguidfortype.aspx

因此，根据文档，它们是相同的.但是，Marshal.GenerateGuidForType仅适用于RuntimeType对象，而Type.GUID也可用于其他一些Type实现.

So according to documentation they are the same. However, Marshal.GenerateGuidForType works only for RuntimeType objects, while Type.GUID is provided for some other Type implementations as well.

例如:

using System;
using System.CodeDom;
using System.Runtime.InteropServices;
using System.Workflow.ComponentModel.Compiler;

namespace Samples
{
    class Program
    {
        static CodeCompileUnit BuildHelloWorldGraph()
        {
            var compileUnit = new CodeCompileUnit();
            var samples = new CodeNamespace("Samples");
            compileUnit.Namespaces.Add(samples);

            var class1 = new CodeTypeDeclaration("Class1");
            samples.Types.Add(class1);

            return compileUnit;
        }


        static void Main(string[] args)
        {
            var unit = BuildHelloWorldGraph();
            var typeProvider = new TypeProvider(null);
            typeProvider.AddCodeCompileUnit(unit);
            var t = typeProvider.GetType("Samples.Class1");
            Console.WriteLine(t.GUID); // prints GUID for design time type instance.
            Console.WriteLine(Marshal.GenerateGuidForType(t)); // throws ArgumentException.
        }
    }
}

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