C# Func Action 无重载代理

最新推荐文章于 2023-11-09 19:30:12 发布

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#C# Func Action

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本文介绍了在C#中如何利用Func和Action作为代理，避免重载函数的编写，提供了一种可变参数的实现方式。

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使用函数代理来封装API时，最常用的莫过于Func和Action。不过官方文档只提供了基于参数数目来的重载函数来实现的方法。下面的代码可以作为可变参数的一种实现，免去了写重载函数的麻烦。

internal static T HandleServiceCall(Expression> serviceMethod)
{
    var serviceMethodInfo = (MethodCallExpression)serviceMethod.Body;
    var argsArr = GetArgs(serviceMethodInfo);

    try
    {
        var ret = serviceMethod.Compile()();
        return ret;
    }
    catch (Exception ex)
    {
        // 
    }
}

internal static void HandleServiceCall(Expression serviceMethod)
{
    var serviceMethodInfo = (MethodCallExpression)serviceMethod.Body;
    var argsArr = GetArgs(serviceMethodInfo);

    try
    {
        serviceMethod.Compile()();
    }
    catch (Exception ex)
    {
        // 
    }
}

private static object[] GetArgs(MethodCallExpression methodExp)
{
    List args = new List();
    foreach (var arg in methodExp.Arguments)
    {
        var obj = Expression.Convert(arg, typeof(object));
        var getterLambda = Expression.Lambda>(obj);
        var getter = getterLambda.Compile();
        args.Add(getter().ToString());
    }
    return args.ToArray();
}
(Expression> serviceMethod)
{
    var serviceMethodInfo = (MethodCallExpression)serviceMethod.Body;
    var argsArr = GetArgs(serviceMethodInfo);

    try
    {
        var ret = serviceMethod.Compile()();
        return ret;
    }
    catch (Exception ex)
    {
        // 
    }
}

internal static void HandleServiceCall(Expression serviceMethod)
{
    var serviceMethodInfo = (MethodCallExpression)serviceMethod.Body;
    var argsArr = GetArgs(serviceMethodInfo);

    try
    {
        serviceMethod.Compile()();
    }
    catch (Exception ex)
    {
        // 
    }
}

private static object[] GetArgs(MethodCallExpression methodExp)
{
    List args = new List();
    foreach (var arg in methodExp.Arguments)
    {
        var obj = Expression.Convert(arg, typeof(object));
        var getterLambda = Expression.Lambda>(obj);
        var getter = getterLambda.Compile();
        args.Add(getter().ToString());
    }
    return args.ToArray();
}