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

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

我还没有发现不符合这个条件的案例。

So 为什么以及何时我应该使用Marshal方法而不是简单地获取GUID财产？

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

... GenerateGuidForType provides the same functionality as the Type.GUID property.

所以根据文档它们是相同的。但是，Marshal.GenerateGuidForType 仅适用于 RuntimeType 对象，而 Type.GUID 也适用于某些其他 Type 实现。

E.g.:

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.
        }
    }
}