类型的可见性，System.Reflection与Mono.Cecil的差异

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SVN Microsoft C C++C#

C#的访问限制修饰符对应到Type的可见性属性有以下对应关系：

顶层类：
public -> IsPublic
internal -> IsNotPublic
（默认）-> internal -> IsNotPublic
嵌套类：
public -> IsNestedPublic
protected -> IsNestedFamily
protected internal -> IsNestedFamilyOrAssembly
private -> IsNestedPrivate
（默认）-> private -> IsNestedPrivate

注意：这些属性之中总是有且只有一个属性为真。一个嵌套类的Type只会显示自身的可见性，其外围类的可见性需要通过Type.DeclaringType找到其外围类的Type来查询。
C#无法表示IsFamANDAssem可见性的类型。

用一段代码通过System.Reflection来测试一下上述对应关系：

using System;
using System.Reflection;

namespace TestReflection {
    static class Program {
        static void Main( string[ ] args ) {
            var asm = Assembly.GetExecutingAssembly( );
            foreach ( var type in asm.GetTypes( ) ) {
                PrintTypeInfo( type );
            }
        }

        static void PrintTypeInfo( Type type ) {
            Console.WriteLine( "Type: {0}", type.ToString( ) );
            Console.WriteLine( "  Name: {0}", type.Name );
            Console.WriteLine( "  FullName: {0}", type.FullName ?? "null" );

            // type of type
            Console.WriteLine( "  IsClass = {0}", type.IsClass );
            Console.WriteLine( "  IsInterface = {0}", type.IsInterface );
            Console.WriteLine( "  IsEnum = {0}", type.IsEnum );
            Console.WriteLine( "  IsValueType = {0}", type.IsValueType );

            // access modifiers
            Console.WriteLine( "  IsPublic = {0}", type.IsPublic );
            Console.WriteLine( "  IsNotPublic = {0}", type.IsNotPublic );
            Console.WriteLine( "  IsNested = {0}", type.IsNested );
            Console.WriteLine( "  IsNestedAssembly = {0}", type.IsNestedAssembly );
            Console.WriteLine( "  IsNestedFamily = {0}", type.IsNestedFamily );
            Console.WriteLine( "  IsNestedFamilyAndAssembly = {0}", type.IsNestedFamANDAssem );
            Console.WriteLine( "  IsNestedFamilyOrAssembly = {0}", type.IsNestedFamORAssem );
            Console.WriteLine( "  IsNestedPrivate = {0}", type.IsNestedPrivate );
            Console.WriteLine( "  IsNestedPublic = {0}", type.IsNestedPublic );

            Console.WriteLine( );
        }
    }

    public class PublicClass {
        public class PublicInnerPublicClass { }
        internal class InternalInnerPublicClass { }
        protected class ProtectedInnerPublicClass { }
        protected internal class ProtectedInternalInnerPublicClass { }
        private class PrivateInnerPublicClass { }
        class DefaultInnerPublicClass { }
    }

    /*internal*/
    class InternalClass {
        public class PublicInnerInternalClass { }
        internal class InternalInnerInternalClass { }
        protected class ProtectedInnerInternalClass { }
        protected internal class ProtectedInternalInnerInternalClass { }
        private class PrivateInnerInternalClass { }
        class DefaultInnerInternalClass { }
    }

    enum InternalEnum { A }
    struct InternalStruct { }
}

运行结果：

引用

Type: TestReflection.Program
Name: Program
FullName: TestReflection.Program
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = True
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.PublicClass
Name: PublicClass
FullName: TestReflection.PublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = True
IsNotPublic = False
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.PublicClass+PublicInnerPublicClass
Name: PublicInnerPublicClass
FullName: TestReflection.PublicClass+PublicInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = True

Type: TestReflection.PublicClass+InternalInnerPublicClass
Name: InternalInnerPublicClass
FullName: TestReflection.PublicClass+InternalInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = True
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.PublicClass+ProtectedInnerPublicClass
Name: ProtectedInnerPublicClass
FullName: TestReflection.PublicClass+ProtectedInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = True
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.PublicClass+ProtectedInternalInnerPublicClass
Name: ProtectedInternalInnerPublicClass
FullName: TestReflection.PublicClass+ProtectedInternalInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = True
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.PublicClass+PrivateInnerPublicClass
Name: PrivateInnerPublicClass
FullName: TestReflection.PublicClass+PrivateInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = True
IsNestedPublic = False

Type: TestReflection.PublicClass+DefaultInnerPublicClass
Name: DefaultInnerPublicClass
FullName: TestReflection.PublicClass+DefaultInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = True
IsNestedPublic = False

Type: TestReflection.InternalClass
Name: InternalClass
FullName: TestReflection.InternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = True
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.InternalClass+PublicInnerInternalClass
Name: PublicInnerInternalClass
FullName: TestReflection.InternalClass+PublicInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = True

Type: TestReflection.InternalClass+InternalInnerInternalClass
Name: InternalInnerInternalClass
FullName: TestReflection.InternalClass+InternalInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = True
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.InternalClass+ProtectedInnerInternalClass
Name: ProtectedInnerInternalClass
FullName: TestReflection.InternalClass+ProtectedInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = True
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.InternalClass+ProtectedInternalInnerInternalClass
Name: ProtectedInternalInnerInternalClass
FullName: TestReflection.InternalClass+ProtectedInternalInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = True
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.InternalClass+PrivateInnerInternalClass
Name: PrivateInnerInternalClass
FullName: TestReflection.InternalClass+PrivateInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = True
IsNestedPublic = False

Type: TestReflection.InternalClass+DefaultInnerInternalClass
Name: DefaultInnerInternalClass
FullName: TestReflection.InternalClass+DefaultInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = True
IsNestedPublic = False

Type: TestReflection.InternalEnum
Name: InternalEnum
FullName: TestReflection.InternalEnum
IsClass = False
IsInterface = False
IsEnum = True
IsValueType = True
IsPublic = False
IsNotPublic = True
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestReflection.InternalStruct
Name: InternalStruct
FullName: TestReflection.InternalStruct
IsClass = False
IsInterface = False
IsEnum = False
IsValueType = True
IsPublic = False
IsNotPublic = True
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

注意到嵌套类的全名中的'+'，那是外围类的全名与嵌套类的类名连接的地方。

===========================================================================

用System.Reflection来加载assembly有一个缺点，那就是加载了的assembly在程序结束前无法卸载，会一直占用内存。为了绕开这个问题，可以用Mono.Cecil来加载assembly并获取相关类型信息。

下面是用SVN trunk里的Mono.Cecil来做同样的测试：

using System;
using System.Reflection;
using Mono.Cecil;

namespace TestCecil {
    static class Program {
        static void Main( string[ ] args ) {
            var path = Assembly.GetExecutingAssembly( ).Location;
            AssemblyDefinition asm = AssemblyFactory.GetAssembly( path );
            ModuleDefinition module = asm.MainModule;
            foreach ( TypeDefinition type in module.Types ) {
                PrintTypeInfo( type );
            }
        }

        static void PrintTypeInfo( TypeDefinition type ) {
            Console.WriteLine( "Type: {0}", type.ToString( ) );
            Console.WriteLine( "  Name: {0}", type.Name );
            Console.WriteLine( "  FullName: {0}", type.FullName ?? "null" );

            // type of type
            Console.WriteLine( "  IsClass = {0}", type.IsClass );
            Console.WriteLine( "  IsInterface = {0}", type.IsInterface );
            Console.WriteLine( "  IsEnum = {0}", type.IsEnum );
            Console.WriteLine( "  IsValueType = {0}", type.IsValueType );

            // access modifiers
            Console.WriteLine( "  IsPublic = {0}", type.IsPublic );
            Console.WriteLine( "  IsNotPublic = {0}", type.IsNotPublic );
            Console.WriteLine( "  IsNested = {0}", type.IsNested );
            Console.WriteLine( "  IsNestedAssembly = {0}", type.IsNestedAssembly );
            Console.WriteLine( "  IsNestedFamily = {0}", type.IsNestedFamily );
            Console.WriteLine( "  IsNestedFamilyAndAssembly = {0}", type.IsNestedFamilyAndAssembly );
            Console.WriteLine( "  IsNestedFamilyOrAssembly = {0}", type.IsNestedFamilyOrAssembly );
            Console.WriteLine( "  IsNestedPrivate = {0}", type.IsNestedPrivate );
            Console.WriteLine( "  IsNestedPublic = {0}", type.IsNestedPublic );

            Console.WriteLine( );
        }
    }

    public class PublicClass {
        public class PublicInnerPublicClass { }
        internal class InternalInnerPublicClass { }
        protected class ProtectedInnerPublicClass { }
        protected internal class ProtectedInternalInnerPublicClass { }
        private class PrivateInnerPublicClass { }
        class DefaultInnerPublicClass { }
    }

    /*internal*/
    class InternalClass {
        public class PublicInnerInternalClass { }
        internal class InternalInnerInternalClass { }
        protected class ProtectedInnerInternalClass { }
        protected internal class ProtectedInternalInnerInternalClass { }
        private class PrivateInnerInternalClass { }
        class DefaultInnerInternalClass { }
    }

    enum InternalEnum { A }
    struct InternalStruct { }
}

运行结果：

引用

Type: <Module>
Name: <Module>
FullName: <Module>
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = True
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.Program
Name: Program
FullName: TestCecil.Program
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = True
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.PublicClass
Name: PublicClass
FullName: TestCecil.PublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = True
IsNotPublic = False
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.PublicClass/PublicInnerPublicClass
Name: PublicInnerPublicClass
FullName: TestCecil.PublicClass/PublicInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = True

Type: TestCecil.PublicClass/InternalInnerPublicClass
Name: InternalInnerPublicClass
FullName: TestCecil.PublicClass/InternalInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = True
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.PublicClass/ProtectedInnerPublicClass
Name: ProtectedInnerPublicClass
FullName: TestCecil.PublicClass/ProtectedInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = True
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.PublicClass/ProtectedInternalInnerPublicClass
Name: ProtectedInternalInnerPublicClass
FullName: TestCecil.PublicClass/ProtectedInternalInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = True
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.PublicClass/PrivateInnerPublicClass
Name: PrivateInnerPublicClass
FullName: TestCecil.PublicClass/PrivateInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = True
IsNestedPublic = False

Type: TestCecil.PublicClass/DefaultInnerPublicClass
Name: DefaultInnerPublicClass
FullName: TestCecil.PublicClass/DefaultInnerPublicClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = True
IsNestedPublic = False

Type: TestCecil.InternalClass
Name: InternalClass
FullName: TestCecil.InternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = True
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.InternalClass/PublicInnerInternalClass
Name: PublicInnerInternalClass
FullName: TestCecil.InternalClass/PublicInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = True

Type: TestCecil.InternalClass/InternalInnerInternalClass
Name: InternalInnerInternalClass
FullName: TestCecil.InternalClass/InternalInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = True
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.InternalClass/ProtectedInnerInternalClass
Name: ProtectedInnerInternalClass
FullName: TestCecil.InternalClass/ProtectedInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = True
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.InternalClass/ProtectedInternalInnerInternalClass
Name: ProtectedInternalInnerInternalClass
FullName: TestCecil.InternalClass/ProtectedInternalInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = True
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.InternalClass/PrivateInnerInternalClass
Name: PrivateInnerInternalClass
FullName: TestCecil.InternalClass/PrivateInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = True
IsNestedPublic = False

Type: TestCecil.InternalClass/DefaultInnerInternalClass
Name: DefaultInnerInternalClass
FullName: TestCecil.InternalClass/DefaultInnerInternalClass
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = False
IsPublic = False
IsNotPublic = False
IsNested = True
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = True
IsNestedPublic = False

Type: TestCecil.InternalEnum
Name: InternalEnum
FullName: TestCecil.InternalEnum
IsClass = True
IsInterface = False
IsEnum = True
IsValueType = True
IsPublic = False
IsNotPublic = True
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

Type: TestCecil.InternalStruct
Name: InternalStruct
FullName: TestCecil.InternalStruct
IsClass = True
IsInterface = False
IsEnum = False
IsValueType = True
IsPublic = False
IsNotPublic = True
IsNested = False
IsNestedAssembly = False
IsNestedFamily = False
IsNestedFamilyAndAssembly = False
IsNestedFamilyOrAssembly = False
IsNestedPrivate = False
IsNestedPublic = False

注意Mono.Cecil在这个测试里与System.Reflection的差异：
1、使用Mono.Cecil的ModuleDefinition.Types能得到<Module>类的信息，而直接用System.Reflection的Assembly.GetTypes()不会得到这个类的信息；
2、System.Reflection使用加号（'+'）来连接外围类与内部类的名字，而Mono.Cecil使用斜杠（'/'）；
3、System.Reflection的Type.IsClass对值类型返回false，而Mono.Cecil的TypeDefinition.IsClass对值类型返回true。（注意运行结果中红色的字）
MSDN上关于Type.IsClass的文档：

MSDN 写道

Gets a value indicating whether the Type is a class; that is, not a value type or interface.

可以认为这是Mono.Cecil的一个bug。前面提到，我用的是现在SVN trunk里的版本，也就是说这个问题可能之前一直都有。查看相关的实现：

Mono.Cecil/TypeAttributes.cs

[Flags]
public enum TypeAttributes : uint {
    // ...

    // Class semantics attributes
    ClassSemanticMask = 0x00000020, // Use this mask to retrieve class semantics information
    Class             = 0x00000000, // Type is a class
    Interface         = 0x00000020, // Type is an interface

    // ...
}

Mono.Cecil/TypeDefinition.cs

#region TypeAttributes

// ...

public bool IsClass {
    get { return (m_attributes & TypeAttributes.ClassSemanticMask) == TypeAttributes.Class; }
    set {
        if (value) {
            m_attributes &= ~TypeAttributes.ClassSemanticMask;
            m_attributes |= TypeAttributes.Class;
        } else
            m_attributes &= ~(TypeAttributes.ClassSemanticMask & TypeAttributes.Class);
    }
}

// ...

#endregion

public bool IsEnum {
    get { return m_baseType != null && m_baseType.FullName == Constants.Enum; }
}

public override bool IsValueType {
    get {
        return m_baseType != null && (
            this.IsEnum || (m_baseType.FullName == Constants.ValueType && this.FullName != Constants.Enum));
    }
}

要修正这个问题很简单，只要在TypeDefinition.IsClass的get方法的返回语句最后加上&& !this.IsValueType就行，变成这样：

public bool IsClass {
    get { return (m_attributes & TypeAttributes.ClassSemanticMask) == TypeAttributes.Class && !this.IsValueType; }
    // ...
}

修改后这个差异就消失了。

===========================================================================

另外也看到Mono.Cecil中的一些细微的可改进的地方（？）
ImageReader.cs
line 69: FileInfo fi = new FileInfo (file);
line 70: if (!File.Exists (fi.FullName))
或许在第70行用fi.Exists()就行了？

分享到：

Cosmos，又一个C#写的操作系统（库） | 关于对象与闭包的关系的一个有趣小故事

2008-09-21 15:43
浏览 2938
评论(2)
查看更多

2 楼 RednaxelaFX 2008-09-22

cajon 写道

Microsoft.Cci也很好用。FxCop中包含它的Assembly。但是似乎没有开源。有Reflactor，开不开源，似乎不重要了。:)

没错，不只FxCop里有Common Compiler Infrastructure（CCI）的assembly，另外一个地方也有：Zonnon，而且两者用的assembly还不完全一样。而且CCI确实是不开源的，是个神秘的项目。在Project 7和7+以外的我们能了解到的关于CCI的信息太少了。FxCop的SDK也迟迟未公开呢。

1 楼 cajon 2008-09-22

Microsoft.Cci也很好用。FxCop中包含它的Assembly。但是似乎没有开源。
有Reflactor，开不开源，似乎不重要了。:)

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