使用表达式获取方法的名称 [英] Get the name of a method using an expression

问题描述

我知道这个网站上有一些答案，如果这有任何重复，我深表歉意，但我发现的所有答案都没有做我想做的.

I know there are a few answers on the site on this and i apologize if this is in any way duplicate, but all of the ones I found does not do what I am trying to do.

我正在尝试指定方法信息，以便我可以通过不使用字符串以类型安全的方式获取名称.所以我想用一个表达式来提取它.

I am trying to specify method info so I can get the name in a type safe way by not using strings. So I am trying to extract it with an expression.

说我想得到这个接口中的一个方法的名字:

Say I want to get the name of a method in this interface:

public interface IMyInteface
{
    void DoSomething(string param1, string param2);
}

目前我可以使用此方法获取名称:

Currently I can get the name using THIS method:

 MemberInfo GetMethodInfo<T>(Expression<Action<T>> expression)
 {
        return ((MethodCallExpression)expression.Body).Method;
 }

我可以按如下方式调用辅助方法:

I can call the helper method as follows:

var methodInfo = GetMethodInfo<IMyInteface>(x => x.DoSomething(null, null));
Console.WriteLine(methodInfo.Name);

但是我在找不指定参数就可以获取方法名的版本(null,null)

But I am looking for the version that I can get the method name without specifying the parameters (null, null)

像这样:

var methodInfo = GetMethodInfo<IMyInteface>(x => x.DoSomething);

但所有尝试都编译失败

有没有办法做到这一点?

Is there a way to do this?

推荐答案

x => x.DoSomething

为了使其可编译，我只看到两种方法:

In order to make this compilable I see only two ways:

1. 采用非通用方式并将其参数指定为 Action
2. 自己指定Action作为你的目标委托类型:GetMethodInfo(x => new Action(x.DoSomething))

1. Go non-generic way and specify it's parameter as Action<string, string>
2. Specify Action<string, string> as your target delegate type by yourself: GetMethodInfo<IMyInteface>(x => new Action<string,string>(x.DoSomething))

如果你可以使用第二个，它允许你省略参数，那么你可以编写你的 GetMethodInfo 方法如下:

if you are ok to go with second one, which allows you to omit arguments then you can write your GetMethodInfo method as follows:

    MemberInfo GetMethodInfo<T>(Expression<Func<T, Delegate>> expression)
    {
        var unaryExpression = (UnaryExpression) expression.Body;
        var methodCallExpression = (MethodCallExpression) unaryExpression.Operand;
        var methodInfoExpression = (ConstantExpression) methodCallExpression.Arguments.Last();
        var methodInfo = (MemberInfo) methodInfoExpression.Value;
        return methodInfo;
    }

它适用于您的界面，但可能需要进行一些概括才能使其适用于任何方法，这取决于您.

It works for your interface, but probably some generalization will be required to make this working with any method, that's up to you.

这篇关于使用表达式获取方法的名称的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！