获取错误“提供的类型必须是枚举。” [英] Getting Error "Type provided must be an Enum."

问题描述

 GeneralSelectServiceClient objservice =  new  GeneralSelectServiceClient（）; 
 IEnumerable< clist> objApproverlist = objservice.GetCList（txtbox.Text）; 
 
  var  result = 来自 CList cu  in  objApproverlist 
 选择  new  {CCode =（ int ）Enum.Parse（ typeof （CList），cu.ToString（）），CDescription = cu.ToString（）} ;  //  此行 
 
  var  tempValue =  new  {CCode =  0 ，CDescription =    - 选择 - }; 
 
  var  list = result.ToList（）;  //  创建可变列表 
 
 list.Insert（ 0 ，tempValue）; 
 
 cbCurrency.DisplayMember =   CDescription; 
 cbCurrency.ValueMember =   CCode 
 cbCurrency.DataSource = objApproverlist.ToList （）; 

解决方案

 CCode =（ int )Enum.Parse( typeof （EnumHere），cu.ToString（））

Enum.Parse需要枚举类型。你正在解析它是一个可枚举的CList



更新：用户通知CList是Enum。



ok - if

 IEnumerable< clist> objApproverlist = objservice.GetCList（txtbox.Text）; 

实际上是

 IEnumerable< CList> objApproverlist = objservice.GetCList（txtbox.Text）; 

那么你不需要那种长篇大论来获得int：

 var result =来自CList cu in objApproverlist select new {CCode =（int）cu，CDescription = cu.ToString（）}; 
 

但我已经测试了两种方式，它对我有用。



请告诉我们您正在使用的所有物品类型



更新2：

我的测试代码：< br $>

  public   enum  CList 
 {
a，b，c，d 
} 
 
 
  private  静态  void  Main（）
 {
 
 IEnumerable< CList> ; objApproverlist = Enum.GetValues（ typeof （CList））。Cast< CList>（）。AsEnumerable（）; 
 
  var  result = 来自 CList cu  in  objApproverlist 
 选择  new  {
 CCode =（  int ）Enum.Parse（ typeof （CList），cu.ToString（）），
  //  我也尝试过： 
  / /   CCode =（int）cu， 
 CDescription = cu.ToString（）}; 
 
  var  tempValue =  new  {CCode =  0 ，CDescription =    - 选择 - }; 
 
  var  list = result.ToList（）; 
 
 list.Insert（ 0 ，tempValue）; 
 
 
 list.ForEach（a = >  
 {
 Console.WriteLine（  {0} \t {1}，a.CCode，a.CDescription）; 
 }）; 
} 

这两种情况都适用。我得到了读数{0 a}，{1 b}等

你已经创建了列表但是将其他东西分配为数据源！我认为你需要下面的代码

 cbCurrency.DataSource = list; 

GeneralSelectServiceClient objservice = new GeneralSelectServiceClient();
            IEnumerable<clist> objApproverlist = objservice.GetCList(txtbox.Text);

 var result = from CList cu in objApproverlist
                             select new { CCode = (int)Enum.Parse(typeof(CList), cu.ToString()), CDescription = cu.ToString() }; //this line

                var tempValue = new { CCode = 0, CDescription = "-- Select --" };

                var list = result.ToList(); // Create mutable list

                list.Insert(0, tempValue);

  cbCurrency.DisplayMember = "CDescription"; 
            cbCurrency.ValueMember = "CCode" 
            cbCurrency.DataSource = objApproverlist.ToList();

解决方案

CCode = (int)Enum.Parse(typeof(EnumHere), cu.ToString())

Enum.Parse requires an enum type. You are parsing it an enumerable CList

UPDATE: User informs that CList is Enum.

ok - if

IEnumerable<clist> objApproverlist = objservice.GetCList(txtbox.Text);

is actually

IEnumerable<CList> objApproverlist = objservice.GetCList(txtbox.Text);

then you don't need that long winded way of getting the int:

var result = from CList cu in objApproverlist select new { CCode = (int)cu, CDescription = cu.ToString() };

But I have tested both ways and it works for me.

Please tell us all the types of the objects you're using

UPDATE 2:
My Test code:

public enum CList
{
    a, b, c, d
}


private static void Main()
{

    IEnumerable<CList> objApproverlist = Enum.GetValues(typeof(CList)).Cast<CList>().AsEnumerable();

    var result = from CList cu in objApproverlist
                 select new { 
                        CCode = (int)Enum.Parse(typeof(CList), cu.ToString()),
                      //I also tried with:
                      //CCode = (int)cu,
                        CDescription = cu.ToString() }; 

    var tempValue = new { CCode = 0, CDescription = "-- Select --" };

    var list = result.ToList(); 

    list.Insert(0, tempValue);


    list.ForEach(a =>
    {
        Console.WriteLine("{0}\t{1}", a.CCode, a.CDescription);
    });
}

This works in both cases. I get the readout {0 a}, {1 b}, etc.

you have created list but assign something else as datasource!, I think you need below code

cbCurrency.DataSource = list; 

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