最好的重载方法匹配有一些无效的参数c＃ [英] the best overloaded method match for has some invalid arguments c#

问题描述

 使用系统; 
 使用 System.Net; 
 使用 System.Windows; 
 使用 System.Windows.Controls; 
 使用 System.Windows.Documents; 
 使用 System.Windows.Ink; 
 使用 System.Windows.Input; 
 使用 System.Windows.Media; 
 使用 System.Windows.Media.Animation; 
 使用 System.Windows.Shapes; 
 
 命名空间 DataView.ViewModels 
 {
  public   class  DashBoardViewModel：BaseViewModel 
 {
 
  private   readonly  DashboardContext dashboardcontext =  new  DashboardContext（）; 
 
  public  EntitySet< DashboardJson> Jsons { get ;  set ; } 
 
  private   void  GetData（）
 {
 dashboardcontext.Load< Cell>（dashboardcontext.GetDashboardDataQuery（），LoadBehavior.RefreshCurrent，OnLoadDashBoardDataCompleted）;  //  错误行 
 Jsons = dashboardcontext.DashboardJsons; 
} 
 
  private   void  OnLoadDashBoardDataCompleted（LoadOperation< DashboardJson> loadOperation ）
 {
  if （loadOperation.HasError）
 {
  if （！this.isSessionExpired（loadOperation））
 {
 MessageBox.Show（loadOperation.Error.Message）; 
 loadOperation.MarkErrorAsHandled（）; 
} 
  //   IsBusy = false;  
} 
  else  
 {
  var  results = dashboardcontext.DashboardJsons.Where（（ DashboardJson c）= > ！loadOperation.Entities.Contains（c））。ToList（）; 
 results.ForEach（（DashboardJson c）= >  dashboardcontext.DashboardJsons.Detach（c））; 
 
} 
} 
 
} 
} 

您好

当我构建程序时，我收到以下错误消息

'System.ServiceModel.DomainServices.Client.DomainContext.Load 
 <   SUM.Data.Helper.DataModel.Cell  > （System.ServiceModel.DomainServices.Client。
 EntityQuery <   SUM.Dataview .Helper.DataModel.Cell  > ，System.ServiceModel.DomainServices。
 Client.LoadBehavior，bool）'有一些无效的参数

请帮助我

解决方案

基本上，错误很明确：你正在调用一个方法，并且有没有定义的方法版本，它采用您提供的参数集。这就像你宣布了一个Add方法：

  public   int 添加（ int  a， int  b）{返回 a + b; } 
  public   double 添加（ double  a， double  b）{ return  a + b; } 

然后尝试用字符串调用它：

  string  result = Add（  two， 两个）; 

系统不知道该怎么做，所以它会产生一个编译错误说没有过载会带来这些参数的组合。



可能是您的参数输入顺序错误，或者您尝试将方法传递给没有正确签名的委托参数。检查Load方法的定义，看看哪些版本可用 - 但我们不能为您做到这一点！ ：笑：

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace DataView.ViewModels
{
    public class DashBoardViewModel : BaseViewModel
    {

        private readonly DashboardContext dashboardcontext = new DashboardContext();

        public EntitySet<DashboardJson> Jsons { get; set; }

        private void GetData()
        {
            dashboardcontext.Load<Cell>(dashboardcontext.GetDashboardDataQuery(), LoadBehavior.RefreshCurrent, OnLoadDashBoardDataCompleted);//Error Line
            Jsons = dashboardcontext.DashboardJsons;
        }

        private void OnLoadDashBoardDataCompleted(LoadOperation<DashboardJson> loadOperation)
        {
            if (loadOperation.HasError)
            {
                if (!this.isSessionExpired(loadOperation))
                {
                    MessageBox.Show(loadOperation.Error.Message);
                    loadOperation.MarkErrorAsHandled();
                }
                //IsBusy = false;
            }
            else
            {
                var results = dashboardcontext.DashboardJsons.Where((DashboardJson c) => !loadOperation.Entities.Contains(c)).ToList();
                results.ForEach((DashboardJson c) => dashboardcontext.DashboardJsons.Detach(c));

            }
        }

    }
}

Hi
When i build the program i got below error message

'System.ServiceModel.DomainServices.Client.DomainContext.Load
<SUM.Data.Helper.DataModel.Cell>(System.ServiceModel.DomainServices.Client.
EntityQuery<SUM.Dataview.Helper.DataModel.Cell>, System.ServiceModel.DomainServices.
Client.LoadBehavior, bool)' has some invalid arguments

Please Help Me

解决方案

Basically, the error is pretty explicit: you are calling a method, and there is no defined version of the method that takes the set of parameters you are supplying. It's like you had declared an Add method:

public int Add(int a, int b) { return a + b; }
public double Add(double a, double b) { return a + b; }

And then tried to call it with strings:

string result = Add("two", "two");

The system doesn't know what to do, so it generates a compilation error to say teh there is no overload that takes that combination of parameters.

It may be that you have the parameters in the wrong order, or you are trying to pass a method to a delegate parameter that doesn't have the right signature. Check the definition of the Load method, and see what versions are available - but we can't do that for you! :laugh:

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