使用帶有「params」關鍵字且無參數的反射調用方法

Question

就像this question我遇到了調用具有「params」關鍵字的方法的問題。我不斷收到TargetParameterCountException異常。 「參數計數不匹配」。 目標是調用此方法不帶參數：

IList<T> List(params Expression<Func<T, object>>[] includeProperties); 

這是我到目前爲止有：

 //Get generic type 
     var entityType = typeof(Applicant).Assembly.GetType(string.Format("Permet.BackEnd.ETL.Domain.Models.{0}", tableName)); 
     //create service that will receive the generic type 
     var constructedIService = typeof(IService<>).MakeGenericType(entityType); 

     //create the argument for the method that we invoke 
     var paramsType = typeof(Expression<>).MakeGenericType(typeof(Func<,>).MakeGenericType(entityType, typeof(object))).MakeArrayType(); 

     //instantiate the service using Unity (todo: fix singleton) 
     var serviceInstance = UnitySingleton.Container.Resolve(constructedIService, ""); 

     //Invoke the service method "List" by passing it no parameters but telling it the signature to use (it has no overloads) 
     //I tried without listing the params since it has no overload but same exception 
     //I get exception Parameter count mismatch here 
     dynamic data = serviceInstance.GetType().GetMethod("List", new Type[] { paramsType }).Invoke(serviceInstance, new object[] { }); 

請注意，我已經嘗試只是路過空並使用過載GetMethod（串名稱）與完全相同的結果。

Answer 1

嘗試用一個參數調用null，因爲C＃編譯器重寫從method(params object[] parameters)方法簽名method(object[] parameters)，也給該方法的調用。

dynamic data = serviceInstance.GetType().GetMethod("List", new Type[] { paramsType }).Invoke(serviceInstance, new object[] { null });