内容纲要
在日常使用委托时，有以下常用方法
| 方法名称 | 说明 |
|---|---|
| Clone | 创建委托的浅表副本。 |
| GetInvocationList | 按照调用顺序返回此多路广播委托的调用列表。 |
| GetMethodImpl | 返回由当前的 MulticastDelegate 表示的静态方法。 |
| GetObjectData | 用序列化该实例所需的所有数据填充 SerializationInfo 对象。 |
| MemberwiseClone | 创建当前 Object 的浅表副本。 |
| RemoveImpl | 调用列表中移除与指定委托相等的元素 |
GetInvocationList() 的用途
当委托有多个返回值时
当你编写一个 delegate委托 或 Func<>泛型委托 ，并为实例绑定多个方法时，每个方法都有一个返回值。可能会遇到这种情况：
class Program { public static string a(string str) { Console.WriteLine("方法a"); return str+"方法a"; } public static string b(string str) { Console.WriteLine("方法b"); return str + "方法b"; } public static string c(string str) { Console.WriteLine("方法c"); return str + "方法c"; } static void Main(string[] args) { Func<string, string> func=a; func += b; func += c; Console.WriteLine(func("测试")); Console.ReadKey(); } }
调用委托后，只能获取到最后一个调用方法的返回值。
使用 GetInvocationList()
GetInvocationList() 能够返回 这个委托的方法链表。
通过使用循环，把每个方法顺序调用一次，每次循环中都会产生当前调用方法的返回值。
class Program
{
public static string a(string str)
{
Console.WriteLine("方法a");
return str+"方法a";
}
public static string b(string str)
{
Console.WriteLine("方法b");
return str + "方法b";
}
public static string c(string str)
{
Console.WriteLine("方法c");
return str + "方法c";
}
static void Main(string[] args)
{
Func<string, string> func=a;
func += b;
func += c;
var funclist = func.GetInvocationList();
foreach (Func<string, string> f in funclist)
{
Console.WriteLine(f("测试"));
}
Console.ReadKey();
}
相当于把委托里顺序调用的方法分离成一个列表，通过循环调用，循环获取。
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