在C＃中创建列表并将值添加到列表 [英] Create List in C# and add values to list

问题描述

  public   class  DashInfo 
 {
  public   int  Gid { get ;  set ; } 
  public   string 组{ get ;  set ; } 
  public   string  Region { get ;  set ; } 
  public   int 持续时间{ get ;  set ; } 
} 
 
  private   void  OnLoadDashBoardDataCompleted（LoadOperation< DashboardJson> loadOperation）
 {
  foreach （DashboardJson dashjson  in  loadOperation.Entities）
 {
  if （dashjson.groups.ElementAt（ 0 ）。Cells.ElementAt（  0 ）！=  null ）
 {
  foreach （ var  region  in  loadOperation.Entities）
 {
  foreach （ var   group  < span class =code-keyword> in  region.groups）
 {
 List< DashInfo> dashinfos =  new 列表< DashInfo>（）; 
 {
  new  DashInfo {Gid =  group  .gid，Group =  group  .Name，Region =  group  .Region，Duration =  group .AvgInf}; 
} 
} 
} 
} 
} 
} 

此方法是真还是假？

如果为false则意味着请帮助我..如何将Gid，Name，Region和Duartion添加到列表中..

解决方案

做出一些改变，比如

  private   void  OnLoadDashBoardDataCompleted（LoadOperation< dashboardjson> loadOperation）
 {
 List< dashinfo> dashinfos =  new 列表< dashinfo>（）; 
  foreach （DashboardJson dashjson  in  loadOperation.Entities）
 {
  if （dashjson.groups.ElementAt（ 0 ）。Cells.ElementAt（ 0 ）！=  null ）
 {
  foreach （ var  region  in  loadOperation.Entities）
 {
  foreach （ var   group   in  region.groups）
 {
 
 {
 dashinfos。 add （ new  DashInfo {Gid =  group  .gid，Group =  group  .Name，Region =  group  .Region，Duration =  group  .AvgInf}）; 
} 
} 
} 
} 
} 
} 

你是每次要添加新项目时创建新列表。此外，在此之后你没有对列表做任何事情。我想你要填写列表，然后从方法中返回：

  private 列表< dashinfo> ; OnLoadDashBoardDataCompleted（LoadOperation< dashboardjson> loadOperation）
 {
 List< dashinfo> dashinfos =  new 列表< dashinfo>（）;  //  创建一次列表 
 
  foreach （DashboardJson dashjson  in  loadOperation.Entities）
 {
  if （dashjson.groups.ElementAt（ 0 ）。Cells.ElementAt（ 0 ）！= < span class =code-keyword> null ）
 {
  foreach （ var  region  in  loadOperation.Entities）
 {
  foreach （  var   group    region.groups）
 {
  //  将项目添加到列表中 
 dashinfos.Add（ new  DashInfo {Gid =  group  .gid，Group =  group  .Name，Region =  group  .Region，Duration =  group  .AvgInf }）; 
} 
} 
} 
} 
} 
 
  return  dashinfos;  //  将创建的列表返回给调用者 
} 

public class DashInfo
{
public int Gid { get; set; }
public string Group { get; set; }
public string Region { get; set; }
public int Duration { get; set; }
}

private void OnLoadDashBoardDataCompleted(LoadOperation<DashboardJson> loadOperation)
{
foreach (DashboardJson dashjson in loadOperation.Entities)
{
if (dashjson.groups.ElementAt(0).Cells.ElementAt(0) != null)
{
foreach (var region in loadOperation.Entities)
{
foreach (var group in region.groups)
{
List<DashInfo> dashinfos = new List<DashInfo>();
{		
new DashInfo { Gid = group.gid, Group = group.Name, Region = group.Region, Duration = group.AvgInf };
}
}
}
}
}
}

This method is true or false?
If false means pls help me.. How to add Gid,Name,Region, and Duartion to list..

解决方案

Make Some Change like

private void OnLoadDashBoardDataCompleted(LoadOperation<dashboardjson> loadOperation)
{
List<dashinfo> dashinfos = new List<dashinfo>();
foreach (DashboardJson dashjson in loadOperation.Entities)
{
if (dashjson.groups.ElementAt(0).Cells.ElementAt(0) != null)
{
foreach (var region in loadOperation.Entities)
{
foreach (var group in region.groups)
{

{		
dashinfos.add(new DashInfo { Gid = group.gid, Group = group.Name, Region = group.Region, Duration = group.AvgInf });
}
}
}
}
}
}

You are creating a new list each time you want to add a new item. Furthermore you are not doing anything with the list after that. I guess you want to fill the list and then return it form the method:

private List<dashinfo> OnLoadDashBoardDataCompleted(LoadOperation<dashboardjson> loadOperation)
{
    List<dashinfo> dashinfos = new List<dashinfo>(); // create the list once
    
    foreach (DashboardJson dashjson in loadOperation.Entities)
    {
        if (dashjson.groups.ElementAt(0).Cells.ElementAt(0) != null)
        {
            foreach (var region in loadOperation.Entities)
            {
                foreach (var group in region.groups)
                {
                    // add items to the list
                    dashinfos.Add(new DashInfo { Gid = group.gid, Group = group.Name, Region = group.Region, Duration = group.AvgInf });
                    }
                }
            }
        }
    }

    return dashinfos; // return the created list to the caller
}

这篇关于在C＃中创建列表并将值添加到列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！