如何在 C# 中将委托转换为对象？
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How to convert delegate to object in C#?
提问by AFgone
I am using reflection class to invoke some methods which are on the some other dll. And one of the methods' parameters are type of delegate.
我正在使用反射类来调用其他一些 dll 上的一些方法。方法的参数之一是委托类型。
And I want to invoke this methods by using reflection. So I need to pass function parameters as object array, but I could not find anything about how to convert delegate to object.
我想通过使用反射来调用这个方法。所以我需要将函数参数作为对象数组传递，但我找不到任何关于如何将委托转换为对象的信息。
Thanks in advance
提前致谢
采纳答案by Matt Howells
A delegate is an object. Just create the expected delegate as you would normally, and pass it in the parameters array. Here is a rather contrived example:
委托是一个对象。只需像往常一样创建预期的委托，并将其传递到参数数组中。这是一个相当人为的例子：
class Mathematician {
public delegate int MathMethod(int a, int b);
public int DoMaths(int a, int b, MathMethod mathMethod) {
return mathMethod(a, b);
}
}
[Test]
public void Test() {
var math = new Mathematician();
Mathematician.MathMethod addition = (a, b) => a + b;
var method = typeof(Mathematician).GetMethod("DoMaths");
var result = method.Invoke(math, new object[] { 1, 2, addition });
Assert.AreEqual(3, result);
}
回答by Cédric Rup
Instances of delegates are objects, so this code works (C#3 style) :
委托的实例是对象，因此此代码有效（C#3 风格）：
Predicate<int> p = (i)=> i >= 42;
Object[] arrayOfObject = new object[] { p };
Hope it helps !
希望能帮助到你 ！
Cédric
塞德里克
回答by Darin Dimitrov
Here's an example:
下面是一个例子：
class Program
{
public delegate void TestDel();
public static void ToInvoke(TestDel testDel)
{
testDel();
}
public static void Test()
{
Console.WriteLine("hello world");
}
static void Main(string[] args)
{
TestDel testDel = Program.Test;
typeof(Program).InvokeMember(
"ToInvoke",
BindingFlags.InvokeMethod | BindingFlags.Public | BindingFlags.Static,
null,
null,
new object[] { testDel });
}
}
回答by CraigTP
I think this blog post:
我认为这篇博文：
C# Reflection - Dealing with Remote Objects
answers your question perfectly.
完美回答你的问题。
回答by AndersK
you can see a delegate as variable type "function". the delegate describes the parameters and return value for a matching function.
您可以将委托视为变量类型“函数”。委托描述了匹配函数的参数和返回值。
delegate void Foo(int a); // here a new delegate obj type Foo has been declared
the above example allows 'Foo' to be used as a data type, the only allowed object that can be matched with a variable of type Foo data type is a method with the same signature so:
上面的示例允许将 'Foo' 用作数据类型，唯一可以与 Foo 数据类型类型的变量匹配的对象是具有相同签名的方法，因此：
void MyFunction(int x);
Foo D = MyFunction; // this is OK
void MyOtherFunction(string x);
Foo D = MyOtherFunction; // will yield an error since not same signature.
Once you have assigned a method to a delegate, you can invoke the method via the delegate:
将方法分配给委托后，您可以通过委托调用该方法：
int n = 1;
D( n ); // or D.Invoke( n );
