无涯教程-C# - 反射在C#中，反射是一个进程，用于在运行时获取某个类型的元数据。System.Refltion命名

在C#中，反射是一个进程，用于在运行时获取某个类型的元数据。System.Refltion命名空间包含反射所需的类，例如：

Type
MemberInfo
ConstructorInfo
MethodInfo
FieldInfo
PropertyInfo
TypeInfo
EventInfo
Module
Assembly
AssemblyName
Pointer etc.

System.Reflection.Emit命名空间包含用于发射元数据的类。

C#类型类

C#类型类表示类类型、接口类型、枚举类型、数组类型、值类型等的类型声明。位于 System 命名空间中。它继承 System.Reflection.MemberInfo 类。

C#类型属性

下面列出了Type类的重要属性：

Property	Description
Assembly	获取此类型的程序集。
AssemblyQualifiedName	获取此类型的程序集限定名称。
Attributes	获取与类型关联的属性。
BaseType	获取基类型或父类型。
FullName	获取类型的完全限定名称。
IsAbstract	用于检查类型是否为抽象。
IsArray	用于检查类型是否为 Array。
IsClass	用于检查类型是否为 Class。
IsEnum	用于检查类型是否为 Enum。
IsInterface	用于检查类型是否为接口。
IsNested	用于检查类型是否为嵌套。
IsPrimitive	用于检查类型是否为 Primitive。
IsPointer	用于检查类型是否为Pointer。
IsNotPublic	用于检查类型是否不是Public。
IsPublic	用于检查类型是否为 Public。
IsSealed	用于检查类型是否为密封。
IsSerializable	用于检查类型是否可序列化。
MemberType	用于检查类型是否为嵌套类型的成员类型。
Module	获取类型的模块。
Name	获取类型的名称。
Namespace	获取类型的命名空间。

C#类型方法

Type类的重要方法列表如下：

Method	Description
GetConstructors()	返回该类型的所有公共构造函数。
GetConstructors(BindingFlags)	返回具有指定 BindingFlags 的 Type 的所有构造函数.
GetFields()	返回该类型的所有公共字段。
GetFields(BindingFlags)	返回具有指定 BindingFlags 的 Type 的所有公共构造函数。
GetMembers()	返回该类型的所有公共成员。
GetMembers(BindingFlags)	返回具有指定 BindingFlags 的 Type 的所有成员。
GetMethods()	返回该类型的所有公共方法。
GetMethods(BindingFlags)	返回具有指定 BindingFlags 的 Type 的所有方法。
GetProperties()	返回该类型的所有公共属性。
GetProperties(BindingFlags)	返回具有指定 BindingFlags 的 Type 的所有属性。
GetType()	获取当前类型。
GetType(String)	获取给定名称的类型。

C#反射示例：获取类型

using System;
public class ReflectionExample
{
   public static void Main()
    {
        int a = 10;
        Type type = a.GetType();
        Console.WriteLine(type);
    }
}

输出：

System.Int32

C#反射示例：获取程序集

using System;
using System.Reflection;
public class ReflectionExample
{
   public static void Main()
    {
        Type t = typeof(System.String);
        Console.WriteLine(t.Assembly); 
   }
}

输出：

mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

C#反射示例：打印类型信息

using System;
using System.Reflection;
public class ReflectionExample
{
    public static void Main()
    {
        Type t = typeof(System.String);
        Console.WriteLine(t.FullName);
        Console.WriteLine(t.BaseType);
        Console.WriteLine(t.IsClass);
        Console.WriteLine(t.IsEnum);
        Console.WriteLine(t.IsInterface);
    }
}

输出：

System.String
System.Object
true
false
false

C#反射示例：打印构造函数

using System;
using System.Reflection;
public class ReflectionExample
{
    public static void Main()
    {
        Type t = typeof(System.String);
    </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="str">"Constructors of {0} type..."</span><span class="pun">,</span><span class="pln"> t</span><span class="pun">);</span><span class="pln">
    </span><span class="typ">ConstructorInfo</span><span class="pun">[]</span><span class="pln"> ci </span><span class="pun">=</span><span class="pln"> t</span><span class="pun">.</span><span class="typ">GetConstructors</span><span class="pun">(</span><span class="typ">BindingFlags</span><span class="pun">.</span><span class="typ">Public</span><span class="pln"> </span><span class="pun">|</span><span class="pln"> </span><span class="typ">BindingFlags</span><span class="pun">.</span><span class="typ">Instance</span><span class="pun">);</span><span class="pln">
    </span><span class="kwd">foreach</span><span class="pln"> </span><span class="pun">(</span><span class="typ">ConstructorInfo</span><span class="pln"> c </span><span class="kwd">in</span><span class="pln"> ci</span><span class="pun">)</span><span class="pln">
    </span><span class="pun">{</span><span class="pln">
        </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="pln">c</span><span class="pun">);</span><span class="pln">
    </span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

}

输出：

Constructors of System.String type...
Void .ctor(Char*)
Void .ctor(Char*, Int32, Int32)
Void .ctor(SByte*)
Void .ctor(SByte*, Int32, Int32)
Void .ctor(SByte*, Int32, Int32, System.Text.Encoding)
Void .ctor(Char[], Int32, Int32)
Void .ctor(Char[])
Void .ctor(Char, Int32)

C#反射示例：打印方法

using System;
using System.Reflection;
public class ReflectionExample
{
    public static void Main()
    {
        Type t = typeof(System.String);
    </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="str">"Methods of {0} type..."</span><span class="pun">,</span><span class="pln"> t</span><span class="pun">);</span><span class="pln">
    </span><span class="typ">MethodInfo</span><span class="pun">[]</span><span class="pln"> ci </span><span class="pun">=</span><span class="pln"> t</span><span class="pun">.</span><span class="typ">GetMethods</span><span class="pun">(</span><span class="typ">BindingFlags</span><span class="pun">.</span><span class="typ">Public</span><span class="pln"> </span><span class="pun">|</span><span class="pln"> </span><span class="typ">BindingFlags</span><span class="pun">.</span><span class="typ">Instance</span><span class="pun">);</span><span class="pln">
    </span><span class="kwd">foreach</span><span class="pln"> </span><span class="pun">(</span><span class="typ">MethodInfo</span><span class="pln"> m </span><span class="kwd">in</span><span class="pln"> ci</span><span class="pun">)</span><span class="pln">
    </span><span class="pun">{</span><span class="pln">
        </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="pln">m</span><span class="pun">);</span><span class="pln">
    </span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

}

输出：

Methods of System.String type...
Boolean Equals(System.Object)
Boolean Equals(System.String)
Boolean Equals(System.String, System.StringComparison)
Char get_Chars(Int32)
Void copyTo(Int32, char[], Int32, Int32)
Char[] ToCharArray()
....

C#反射示例：打印字段

using System;
using System.Reflection;
public class ReflectionExample
{
    public static void Main()
    {
        Type t = typeof(System.String);
    </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="str">"Fields of {0} type..."</span><span class="pun">,</span><span class="pln"> t</span><span class="pun">);</span><span class="pln">
    </span><span class="typ">FieldInfo</span><span class="pun">[]</span><span class="pln"> ci </span><span class="pun">=</span><span class="pln"> t</span><span class="pun">.</span><span class="typ">GetFields</span><span class="pun">(</span><span class="typ">BindingFlags</span><span class="pun">.</span><span class="typ">Public</span><span class="pln"> </span><span class="pun">|</span><span class="pln"> </span><span class="typ">BindingFlags</span><span class="pun">.</span><span class="typ">Static</span><span class="pln"> </span><span class="pun">|</span><span class="pln"> </span><span class="typ">BindingFlags</span><span class="pun">.</span><span class="typ">NonPublic</span><span class="pun">);</span><span class="pln">
    </span><span class="kwd">foreach</span><span class="pln"> </span><span class="pun">(</span><span class="typ">FieldInfo</span><span class="pln"> f </span><span class="kwd">in</span><span class="pln"> ci</span><span class="pun">)</span><span class="pln">
    </span><span class="pun">{</span><span class="pln">
        </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="pln">f</span><span class="pun">);</span><span class="pln">
    </span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

}

输出：

Fields of System.String type...
System.String Empty
Int32 TrimHead
Int32 TrimTail
Int32 TrimBoth
Int32 charPtrAlignConst
Int32 alignConst

无涯教程-C# - 反射