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    1. 代表一个动作<参考 T1,T2>

      时间:2023-11-11
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                本文介绍了代表一个动作<参考 T1,T2>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跟版网的小编来一起学习吧!

                问题描述

                我正在尝试创建一个采用 ref 参数的静态方法的委托.请不要问我为什么要做这样的 cockamamie 事情.这都是学习 .Net、C# 和反射如何工作以及如何优化它的一部分.

                I'm trying to create a delegate of a static method which takes a ref argument. Please don't ask why I'm doing such a cockamamie thing. It's all part of learning how .Net, C#, and reflection work and how to optimize it.

                我的代码是:

                    public struct DataRow
                    {
                
                        private double t;
                        static public void Cram_T(ref DataRow dr, double a_t)
                        {
                            dr.t = a_t;
                        }
                    }
                 ''''
                  Type myType = typeof(DataRow);
                  MethodInfo my_Cram_T_Method = myType.GetMethod("Cram_T");
                  var myCram_T_Delegate = 
                         Delegate.CreateDelegate(typeof(Action<DataRow, Double>),      
                                                 my_Cram_T_Method) 
                                                 as Action<DataRow, Double>;
                

                这给了我一个绑定错误,因为(我认为)通用操作与方法不匹配.

                This gives me a binding error because (I think) the generic action doesn't match the method.

                在监视窗口中检查 Cram_T_Method 的值给出

                Inspecting the value of Cram_T_Method in the watch window gives

                {Void Cram_T(DataRow ByRef, Double)}
                

                然后我尝试在 Action 中使用 ref 关键字:

                I then tried using the ref keyword in the Action:

                  var myCram_T_Delegate = 
                         Delegate.CreateDelegate(typeof(Action<ref DataRow, Double>),         
                                                 my_Cram_T_Method) 
                                                 as Action<ref DataRow, Double>;
                

                但这不会编译.C# 编译器在标记ref"处窒息.

                But this won't compile. The C# compiler chokes at the token "ref".

                创建此委托的正确方法是什么?

                What is the right way to create this delegate?

                推荐答案

                创建自己的委托类型:

                delegate void MyAction(ref DataRow dataRow, double doubleValue);
                

                并使用 MyAction 代替 Action<ref DataRow, Double> - 正如您所指出的那样,它不会编译.

                And use MyAction in place of Action<ref DataRow, Double> -- which, as you've noted, doesn't compile.

                这篇关于代表一个动作<参考 T1,T2>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跟版网!

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