未找到 mscorlib 中的类型

发布于 2024-09-13 04:54:51 字数 452 浏览 3 评论 0原文

有件事我无法理解。我无法阅读类型参考：

Assembly mscorlib = Assembly.Load("mscorlib");

// it DOES exist, returns type reference:
mscorlib.GetType("System.Deployment.Internal.Isolation.IDefinitionAppId");

// but its parent scope doesn't exist.. returns null:
mscorlib.GetType("System.Deployment.Internal.Isolation"); 

// even though it exists, it doesn't compile
// System.Deployment.Internal.Isolation.IDefinitionAppId x;

这怎么可能？

原文

There is something I cannot understand. I can't read the type reference:

Assembly mscorlib = Assembly.Load("mscorlib");

// it DOES exist, returns type reference:
mscorlib.GetType("System.Deployment.Internal.Isolation.IDefinitionAppId");

// but its parent scope doesn't exist.. returns null:
mscorlib.GetType("System.Deployment.Internal.Isolation"); 

// even though it exists, it doesn't compile
// System.Deployment.Internal.Isolation.IDefinitionAppId x;

How is this possible?

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指尖微凉心微凉 2024-09-20 04:54:51

最后一行无法编译的原因是 IDefinitionAppId 是 internal - 而不是因为 System.Deployment.Internal.Isolation 是一种类型。

请注意，如果 Isolation 是类型名称，则必须使用 GetType("System.Deployment.Internal.Isolation+IDefinitionAppId")（注意 +）因为这就是 CLR 名称中嵌套类型的表示方式。

演示这一点非常简单：

using System;
using System.Reflection;

public class Test
{
    static void Main()
    {
        Assembly mscorlib = typeof(string).Assembly;
        string name = "System.Deployment.Internal.Isolation.IDefinitionAppId";
        Type type = mscorlib.GetType(name);

        // Prints System.Deployment.Internal.Isolation
        Console.WriteLine(type.Namespace);
    }
}

所以 System.Deployment.Internal.Isolation 是一个命名空间，而不是类型，因此为什么 Assembly.GetType(...) 不这样做找到它作为一种类型。

The reason your last line won't compile is because IDefinitionAppId is internal - not because System.Deployment.Internal.Isolation is a type.

Note that if Isolation were the name of a type, you'd have to use GetType("System.Deployment.Internal.Isolation+IDefinitionAppId") (note the +) as that's how nested types are represented in CLR names.

It's very simple to demonstrate this:

using System;
using System.Reflection;

public class Test
{
    static void Main()
    {
        Assembly mscorlib = typeof(string).Assembly;
        string name = "System.Deployment.Internal.Isolation.IDefinitionAppId";
        Type type = mscorlib.GetType(name);

        // Prints System.Deployment.Internal.Isolation
        Console.WriteLine(type.Namespace);
    }
}

So System.Deployment.Internal.Isolation is a namespace, not a type, hence why Assembly.GetType(...) doesn't find it as a type.

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