从methodinfo获取代理 [英] Getting a delegate from methodinfo

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本文介绍了从methodinfo获取代理的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个下拉列表,它通过检查一个类的方法并包括与特定签名相匹配的方法来填充。问题在于从列表中获取所选项目,并让代理在该类中调用该方法。第一种方法是有效的,但我无法确定第二种方法。



例如,

  public delegate void MyDelegate(MyState state); 

public static MyDelegate GetMyDelegateFromString(string methodName)
{
switch(methodName)
{
caseCallMethodOne:
返回MyFunctionsClass。 CallMethodOne;
caseCallMethodTwo:
return MyFunctionsClass.CallMethodTwo;
默认值:
返回MyFunctionsClass.CallMethodOne;
}
}

public static MyDelegate GetMyDelegateFromStringReflection(string methodName)
{
MyDelegate function = MyFunctionsClass.CallMethodOne;

输入inf = typeof(MyFunctionsClass);
foreach(inf.GetMethods()中的var方法)
{
if(method.Name == methodName)
{
// function = method;
//如何获取函数调用?
}
}

返回函数;
}

如何获取第二种方法的注释部分?如何将 MethodInfo 投入委托?



谢谢!



编辑:这是工作解决方案。

  public static MyDelegate GetMyDelegateFromStringReflection methodName)
{
MyDelegate function = MyFunctionsClass.CallMethodOne;

输入inf = typeof(MyFunctionsClass);
foreach(inf.GetMethods()中的var方法)
{
if(method.Name == methodName)
{
function =(MyDelegate)Delegate.CreateDelegate (typeof(MyDelegate),方法);
}
}

返回函数;
}


解决方案

你需要打电话某些形式的 Delegate.CreateDelegate(),具体取决于该方法是否为静态或实例方法。


I have a drop down list that is populated by inspecting a class's methods and including those that match a specific signature. The problem is in taking the selected item from the list and getting the delegate to call that method in the class. The first method works, but I cannot figure out part of the second.

For example,

public delegate void MyDelegate(MyState state);

public static MyDelegate GetMyDelegateFromString(string methodName)
{
    switch (methodName)
    {
        case "CallMethodOne":
            return MyFunctionsClass.CallMethodOne;
        case "CallMethodTwo":
            return MyFunctionsClass.CallMethodTwo;
        default:
            return MyFunctionsClass.CallMethodOne;
    }
}

public static MyDelegate GetMyDelegateFromStringReflection(string methodName)
{
    MyDelegate function = MyFunctionsClass.CallMethodOne;

    Type inf = typeof(MyFunctionsClass);
    foreach (var method in inf.GetMethods())
    {
        if (method.Name == methodName)
        {
            //function = method;
            //how do I get the function to call?
        }
    }

    return function;
}

How do I get the commented out section of the second method to work? How do I cast the MethodInfo into the delegate?

Thanks!

Edit: Here is the working solution.

public static MyDelegate GetMyDelegateFromStringReflection(string methodName)
{
    MyDelegate function = MyFunctionsClass.CallMethodOne;

    Type inf = typeof(MyFunctionsClass);
    foreach (var method in inf.GetMethods())
    {
        if (method.Name == methodName)
        {
            function = (MyDelegate)Delegate.CreateDelegate(typeof(MyDelegate), method);
        }
    }

    return function;
}

解决方案

You'll need to call some form of Delegate.CreateDelegate(), depending on whether the method in question is a static or instance method.

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