无法将数据导入列表框 [英] unable to get data to list box

问题描述

  public  SelectList GetAllprofsssinList（）
 {
  var  PList =  new  List< Profession&（）; 
 
 ds = dropdown.GetDropDownList（）; 
  for （ int  record =  0 ; record <  = ds.Tables [ 1 ]。Rows.Count  -   1 ;记录++）
 {
 
 Profession objprof =  new  Profession（）; 
 动态行= ds.Tables [ 1 ]。行[记录]; 
 objprof.ProfessionId = Convert.ToInt32（row [  ID]）; 
 objprof.ProfessionName = Convert.ToString（row [DescriptionName]; 
} 
 
 SelectList testList =  new  SelectList（ PList，ProfessionId;，ProfessionName; 
  return  testList; 
} 

here in我的testList是null，但值是来到ProfessionId和ProfessionName

怎么办

解决方案

我想你错过了一行来填充那个list。

  for （ int  record =  0 ;记录<  = ds.Tables [ 1 ]。Rows.Count  -   1 ;记录++）
 {
 Profession objprof = 新专业（）; 
 动态行= ds.Tables [ 1 ] .Rows [记录]; 
 objprof.ProfessionId = Convert.ToInt32（row [  ID]）; 
 objprof.ProfessionName = Convert.ToString（row [DescriptionName]; 
 
  PList.Add（objprof）;  
} 

public SelectList GetAllprofsssinList()
{
    var PList = new List<Profession&();
   
    ds = dropdown.GetDropDownList();
    for (int record = 0; record <= ds.Tables[1].Rows.Count - 1; record++)
    {
       
        Profession objprof = new Profession();
        dynamic row = ds.Tables[1].Rows[record];
        objprof.ProfessionId = Convert.ToInt32(row["ID"]);
        objprof.ProfessionName = Convert.ToString(row[DescriptionName];    
    }

    SelectList testList = new SelectList(PList,ProfessionId;, ProfessionName;
    return testList;
}

here in my testList is null but the values are coming to ProfessionId and ProfessionName
what to do

解决方案

I think you missed one line to populate that list.

for (int record = 0; record <= ds.Tables[1].Rows.Count - 1; record++)
{
    Profession objprof = new Profession();
    dynamic row = ds.Tables[1].Rows[record];
    objprof.ProfessionId = Convert.ToInt32(row["ID"]);
    objprof.ProfessionName = Convert.ToString(row[DescriptionName];

    PList.Add(objprof); 
}

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