为什么允许从 MemberInfo 转换为 MethodInfo？

Question

System.Reflection.MemberInfo 的文档有以下示例：

foreach (MemberInfo mi in t.GetMembers())  
{
    if (mi.MemberType == MemberTypes.Method)
    {
        foreach (ParameterInfo pi in ((MethodInfo)mi).GetParameters())

注意演员表 (MethodInfo)mi)。 MemberInfo 和 MethodInfo 没有共同的父级，那么为什么允许转换？

Answer 1

MethodInfo 继承自 MethodBase 继承自 MemberInfo.

[SerializableAttribute]
[ClassInterfaceAttribute(ClassInterfaceType.None)]
[ComVisibleAttribute(true)]
[PermissionSetAttribute(SecurityAction.InheritanceDemand, Name = "FullTrust")]
public abstract class MethodInfo : MethodBase, 
    _MethodInfo

[SerializableAttribute]
[ClassInterfaceAttribute(ClassInterfaceType.None)]
[ComVisibleAttribute(true)]
[PermissionSetAttribute(SecurityAction.InheritanceDemand, Name = "FullTrust")]
public abstract class MethodBase : MemberInfo, 
    _MethodBase

Answer 2

MethodInfo is derived from MethodBase, which is derived from MemberInfo。请注意，封闭 if 中的 mi.MemberType == MemberTypes.Method 条件会在运行时防止 InvalidCastException 发生。

为什么允许从 MemberInfo 转换为 MethodInfo？

Why cast from MemberInfo to MethodInfo is allowed?

c#

.net

reflection

system.reflection