问题描述
就像这个问题我遇到了调用具有params关键字的方法的问题。我不断收到TargetParameterCountException异常。 参数计数不匹配。
目标是不带参数调用此方法:
尝试使用单个参数 null 调用它,因为C#编译器将方法签名从方法(params object []参数)重写为方法(object []参数)以及对该方法的调用。
dynamic data = serviceInstance.GetType()。GetMethod(List,new Type [ ] {paramsType})。Invoke(serviceInstance,new object [] {null});
Just like this question I'm having issues invoking a method that has the "params" keyword. I keep getting TargetParameterCountException exceptions. "Parameter count mismatch".The goal is to call this method with no parameters:
IList<T> List(params Expression<Func<T, object>>[] includeProperties);Here is what I have so far:
//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[] { });Please note that I have tried just passing null and using the overload GetMethod(string name) with exactly the same result.
解决方案Try invoking it with a single parameter null because the C# compiler rewrites the method signature from method(params object[] parameters) to method(object[] parameters) and also the calls to that method.
dynamic data = serviceInstance.GetType().GetMethod("List", new Type[] { paramsType }).Invoke(serviceInstance, new object[] { null });
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