Csharp 如何构建 lambda 表达式

我用两种方法重新创建了一个小示例来实现lambda(参见第test1和test2类)

internal class Program
{
    static void Main(string[] args)
    {
        var one = new One();
        var two = new Two();

        var obj_int = new ClassX();
        var obj_str = new ClassX();

        var ActOne = new test1<int, One>();
        var ActTwo = new test1<string, Two>();

        ActOne.myLambda1(obj_int, 10, one);
        ActTwo.myLambda1(obj_str, "Youpi", two);

        Console.WriteLine($"one = {obj_int.Value} two = {string.Join(",",(char[])obj_str.Value)}");

        new test2<int, One>().myLambda2(obj_int, 20);
        new test2<string, Two>().myLambda2(obj_str, "Super");

        Console.WriteLine($"one = {obj_int.Value} two = {string.Join(",", (char[])obj_str.Value)}");
    }

}
//lambda with U instantiated
public class test1<T,U> where U : ITest<T>
{
    public Action<ClassX, T, U> myLambda1 = (arg1, arg2, arg3) =>
    {
        arg3.SetValue(arg1, arg2);
    };
}
//lambda with U not instantiated
public class test2<T, U> where U : ITest<T> , new()
{ 
    public Action<ClassX, T> myLambda2 = (arg1, arg2) =>
    {
        new U().SetValue(arg1, arg2);
    };
}

public class ClassX
{
    public object Value;
}

public interface ITest<T>
{
    void SetValue(ClassX parameter, T value);
}
public class One : ITest<int>
{
    public void SetValue(ClassX parameter, int value)
    {
        parameter.Value = value + 10;
    }
}

public class Two : ITest<string>
{
    public void SetValue(ClassX parameter, string value)
    {
        parameter.Value = value.ToCharArray();
    }
}

结果:

one = 20 two = Y,o,u,p,i
one = 30 two = S,u,p,e,r