c# - 子类化 C# System.Type 的最简单方法

Question

我需要让定点数类继承自 System.Type。

class FixedPoint : Type
{
    public bool Signed { get; set; }
    public int Width { get; set; }
    public int IntegerWidth { get; set; }
    public FixedPoint(Boolean signed = false, int width = 16, int integerWidth = 8)
    {
        Signed = signed;
        Width = width;
        IntegerWidth = integerWidth;
    }
}

当我尝试编译这段代码时，我收到错误消息说我需要实现方法，因为 Type 是抽象类。

userdef.cs(3,7): error CS0534: 'FixedPoint' does not implement inherited abstract member 'System.Type.GUID.get'
userdef.cs(3,7): error CS0534: 'FixedPoint' does not implement inherited abstract member 'System.Type.Namespace.get'
c:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll: (Location of symbol related to previous error)
userdef.cs(3,7): error CS0534: 'FixedPoint' does not implement inherited abstract member
        'System.Type.AssemblyQualifiedName.get'

如何避免这些错误消息？有什么简单的方法可以子类化 Type 吗？我必须实现所有方法吗？如果是这样，是否有这样做的引用资料？

或者

子类化Type的工作值得一试吗？出于某些原因，我确实需要对 Type 进行子类化，如果这真的很难做到的话。我最好早点放弃，另辟蹊径。

Answer 1

你说你有继承 System.Type 的理由，尽管我同意@mootinator，这里有一些对你其他问题的回答:

Is there any easy way to subclass Type?

没有。

Do I have to implement all the methods?

是的。

If so, are there any references for doing that?

您将 override 关键字添加到每个 Properties 和 Methods

这是您如何开始的示例，您需要覆盖每个抽象属性和方法。

public class Test : Type
{
    public override Guid GUID
    {
        get { throw new NotImplementedException(); }
    }
}

这是一个完整的可编译类，它覆盖了所有需要的属性和方法，但没有任何实现。

public class Test : Type
{
    public override Guid GUID
    {
        get { throw new NotImplementedException(); }
    }

    public override bool IsDefined(Type attributeType, bool inherit)
    {
        throw new NotImplementedException();
    }
    public override object[] GetCustomAttributes(bool inherit)
    {
        throw new NotImplementedException();
    }
    public override string Name
    {
        get { throw new NotImplementedException(); }
    }
    protected override bool HasElementTypeImpl()
    {
        throw new NotImplementedException();
    }
    public override object[] 
           GetCustomAttributes(Type attributeType, bool inherit)
    {
        throw new NotImplementedException();
    }
    public override Type UnderlyingSystemType
    {
        get { throw new NotImplementedException(); }
    }
    public override Type GetElementType()
    {
        throw new NotImplementedException();
    }
    protected override bool IsCOMObjectImpl()
    {
        throw new NotImplementedException();
    }
    protected override bool IsPrimitiveImpl()
    {
        throw new NotImplementedException();
    }
    protected override bool IsPointerImpl()
    {
        throw new NotImplementedException();
    }
    protected override bool IsByRefImpl()
    {
        throw new NotImplementedException();
    }
    protected override bool IsArrayImpl()
    {
        throw new NotImplementedException();
    }
    protected override System.Reflection.TypeAttributes 
                       GetAttributeFlagsImpl()
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.MemberInfo[] 
           GetMember(string name, System.Reflection.BindingFlags bindingAttr)
    {
        return base.GetMember(name, bindingAttr);
    }
    public override Type 
           GetNestedType(string name, System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.PropertyInfo[] 
           GetProperties(System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    protected override System.Reflection.PropertyInfo 
              GetPropertyImpl(string name, System.Reflection.BindingFlags bindingAttr, 
                              System.Reflection.Binder binder, Type returnType, Type[] types, 
                              System.Reflection.ParameterModifier[] modifiers)
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.MemberInfo[] 
           GetMembers(System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    public override Type[] GetNestedTypes(System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.EventInfo[] GetEvents()
    {
        return base.GetEvents();
    }
    public override Type[] GetInterfaces()
    {
        throw new NotImplementedException();
    }
    public override Type GetInterface(string name, bool ignoreCase)
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.EventInfo[] 
           GetEvents(System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.FieldInfo[] 
           GetFields(System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.EventInfo 
           GetEvent(string name, System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.FieldInfo 
           GetField(string name, System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.MethodInfo[] 
           GetMethods(System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    protected override System.Reflection.MethodInfo 
              GetMethodImpl(string name, System.Reflection.BindingFlags bindingAttr,
                            System.Reflection.Binder binder, System.Reflection.CallingConventions callConvention, 
                            Type[] types, System.Reflection.ParameterModifier[] modifiers)
    {
        throw new NotImplementedException();
    }
    public override System.Reflection.ConstructorInfo[] GetConstructors(System.Reflection.BindingFlags bindingAttr)
    {
        throw new NotImplementedException();
    }
    protected override System.Reflection.ConstructorInfo 
              GetConstructorImpl(System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder,
                                 System.Reflection.CallingConventions callConvention, Type[] types, 
                                 System.Reflection.ParameterModifier[] modifiers)
    {
        throw new NotImplementedException();
    }
    public override Type BaseType
    {
        get { throw new NotImplementedException(); }
    }
    public override string AssemblyQualifiedName
    {
        get { throw new NotImplementedException(); }
    }
    public override string Namespace
    {
        get { throw new NotImplementedException(); }
    }
    public override string FullName
    {
        get { throw new NotImplementedException(); }
    }
    public override System.Reflection.Assembly Assembly
    {
        get { throw new NotImplementedException(); }
    }
    public override System.Reflection.Module Module
    {
        get { throw new NotImplementedException(); }
    }
    public override object 
           InvokeMember(string name, System.Reflection.BindingFlags invokeAttr, 
                        System.Reflection.Binder binder, object target, object[] args, 
                        System.Reflection.ParameterModifier[] modifiers, 
                        System.Globalization.CultureInfo culture, string[] namedParameters)
    {
        throw new NotImplementedException();
    }
}

这些是您需要实现的属性获取

• GUID
• 基本类型
• 程序集合格名
• 命名空间
• 全名
• 大会
• 模块
• 底层系统类型
• 姓名

这些是您需要实现的方法

• 调用成员
• GetConstructorImpl
• 获取构造函数
• 获取方法实现
• 获取方法
• 获取字段
• 获取事件
• 获取字段
• 获取事件
• 获取接口(interface)
• 获取接口(interface)
• 获取事件
• 获取嵌套类型
• 获取成员(member)
• GetPropertyImpl
• 获取属性
• 获取嵌套类型
• 获取成员(member)
• GetAttributeFlagsImpl
• IsArrayImpl
• IsByRefImpl
• IsPointerImpl
• IsPrimitiveImpl
• IsCOMObjectImpl
• 获取元素类型
• 获取自定义属性
• 有ElementTypeImpl
• 获取自定义属性
• 已定义

如您所见，为了消除所有编译错误，您需要重写很多，所以要么您有充分的理由想要这样做，要么您应该考虑从另一个类重写/结构或只是创建一个新的类/结构。