总结用表达式数调用的实例代码

    public static class DynamicMethodBuilder    {
public static Delegate BuildDynamicDelegate(MethodInfo methodInfo, ConstructorInfo constructorInfo = null)        {
    if (methodInfo == null)throw new argumentNullException("methodInfo");
                ListParameterExPression>
     paramExPRessions = methodInfo.GetParameters().Select((p, i) =>
{
    VAR name = "param" + (i + 1);
    return Expression.Parameter(p.ParameterTyPE, name);
            }
    ).ToList();
                MethodCallExpression callExpression;
if (methodInfo.IsStatic)            {
    //Call(params....)callExpression = Expression.Call(methodInfo, paramExpressions);
            }
else{
if (constructorInfo != null)                {
    //Instance(params).Call(params....)ListParameterExpression>
     constructorParamExpressions = constructorInfo.GetParameters().Select((p, i) =>
{
    var name = "constparam" + (i + 1);
    return Expression.Parameter(p.ParameterType, name);
                    }
    ).ToList();
                        callExpression = Expression.Call(Expression.New(constructorInfo, constructorParamExpressions), methodInfo, paramExpressions);
                        paramExpressions.InsertRange(0, constructorParamExpressions);
                }
else{
                        callExpression = Expression.Call(Expression.New(methodInfo.ReflectedType), methodInfo, paramExpressions);
                }
            }
    return Expression.Lambda(callExpression, paramExpressions).COMpile();
        }
     }
    

测试：

    public class Baby    {
            private readonly DateTime _birthDay;
        public Baby(DateTime birthDay)        {
                _birthDay = birthDay;
        }
        public Baby()        {
                _birthDay = DateTime.Now;
        }
            public string GetBabyInfo(string name, int sex) =>
 $"姓名：{
name}
 , 出生天数：{
 DateTime.Now- _birthDay}
 ,性别 ：{
(sex == 1 ? "男" : "女")}
    ";
    }
    class Program    {
        static void Main(string[] args)        {
                Type targetType = AsSEMbly.GetExecutingAssembly().GetType("ConsoleApplication1.Baby");
            MethodInfo methodInfo = targetType.GetMethod("GetBabyInfo", new[] {
 typeof(string), typeof(int) }
    );
            ConstructorInfo constructor = targetType.GetConstructor(new[] {
 typeof(DateTime) }
    );
                WIThConstructor(methodInfo, constructor);
                WithOutConstructor(methodInfo);
                Console.ReadKey();
        }
        static void WithConstructor(MethodInfo methodInfo, ConstructorInfo constructor)        {
                var func = (FuncDateTime, string, int, string>
    )DynamicMethodBuilder.BuildDynamicDelegate(methodInfo, constructor);
                Console.WriteLine(func(DateTime.Now.AddDays(-100), "糖墩儿", 1));
        }
        static void WithOutConstructor(MethodInfo methodInfo)        {
                var func = (Funcstring, int, string>
    )DynamicMethodBuilder.BuildDynamicDelegate(methodInfo);
                Console.WriteLine(func("糖墩儿", 1));
        }
    }
    

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