如何在没有IEnumerable的情况下循环此对象

Question

我只是试图循环所有

结果对象中的

项[x]（我自己返回此对象的函数，它基本上只返回一个字符串列表）。这来自我为Web服务目的创建的vb.net函数。我认为做一个foreach循环会更容易做到最有效但我不能这样做，因为我的类没有实现IEnumerable。但是我想知道是否有更简单的方法来循环这个而不使用iEnumerable。 非常感谢您的帮助。 这就是这个类看起来像是通过我的函数返回的。

Public Class GetErrors 
    Public FWWDIR_ERR_VENDOR As String = String.Empty
    Public FWWDIR_ERR_INVOICE As String = String.Empty
    Public FWWDIR_ERR_ACCOUNT As String = String.Empty
    Public FWWDIR_ERR_FUND As String = String.Empty
    Public FWWDIR_ERR_ORGN As String = String.Empty
    Public FWWDIR_ERR_PROG As String = String.Empty
    Public FWWDIR_ERR_ADDRSS_TYP As String = String.Empty
    Public FWWDIR_ERR_ADDRSS_SEQ As String = String.Empty
    Public FWWDIR_ERR_LOCATION As String = String.Empty
    Public FWWDIR_ERR_ACTIVITY As String = String.Empty
    Public FWWDIR_ROW As String = String.Empty
    Public service_error As String = String.Empty
    Public FWWDIR_ERR_PO As String = String.Empty
    Public FWWDIR_ERR_CHKVEND As String = String.Empty
    Public FWWDIR_ERR_FSYR As String = String.Empty
    Public FWWDIR_ERR_FSPD As String = String.Empty
    Public FWWDIR_ERR_ONTM_VEND As String = String.Empty
    Public FWWDIR_ERR_ONTM_ADRS1 As String = String.Empty
    Public FWWDIR_ERR_ONTM_CITY As String = String.Empty
    Public FWWDIR_ERR_ONTM_STATE As String = String.Empty
    Public FWWDIR_ERR_ONTM_ZIP As String = String.Empty
    Public FWWDIR_ERR_ENCUM_AMT As String = String.Empty
    Public FWWDIR_ERR_ENCUM_VEND As String = String.Empty
    Public FWWDIR_ERR_ITEM_ERROR As String = String.Empty
    Public FWWDIR_POHD As String = String.Empty
End Class

我试过的短代码snipet。

ServiceApUtils _apUtils = new ServiceApUtils();
var   results = _apUtils.ADP_Processor(l_taxcode.ToArray(), l_amount.ToArray(), l_row.ToArray());
//Response.Write(results[0].)
if (results[0].service_error!="")
{
    Response.Write(results[0].service_error);

}
else if (results.Count > 0)//
{
    for (int x = 0; x < results.Count; x++ ) //typecast x a get error to loop the results
    {
        TableRow tr = new TableRow();
        Table1.Rows.Add(tr);
        foreach (string value in results[x])//fails here with Ienumerable error
        {
           TableCell tc = new TableCell();
           tc.Text = results[x].FWWDIR_ROW + results[x].FWWDIR_ERR_INVOICE + results[x].FWWDIR_ERR_ACCOUNT;
           tr.Cells.Add(tc);// = new TableCell();
        }
    }
}

无论我尝试iEnumerable错误或者我根本不知道如何在每个数组项内循环，我都会收到错误。

使用类作为返回的函数正在执行此操作

Public Function ADP_Processor(
    ByVal w_taxcode As String(), _
    ByVal w_Amount As String(), _
    ByVal w_row As String()) As List(Of GetErrors)

Answer 1

尝试删除你的foreach并拥有：

for (int x = 0; x < results.Count; x++ ) //typecast x a get error to loop the results
{
  TableRow tr = new TableRow();
  Table1.Rows.Add(tr);

  GetErrors value = results[x];

  TableCell tc = new TableCell();
  tc.Text = results[x].FWWDIR_ROW + results[x].FWWDIR_ERR_INVOICE + results[x].FWWDIR_ERR_ACCOUNT;
  tr.Cells.Add(tc);// = new TableCell();
}

看来你正在尝试使用类似方法的类，因此像字符串数组一样使用字段。 “results”中的每个项目都是GetErrors类的一个实例，除非您实现IEnumerable并让GetEnumerator返回每个字段中的值，否则不能在foreach中使用它。

Answer 2

我认为问题出现在你的循环中：

 foreach (string value in results[x])//fails here with Ienumerable error
                       {

                           TableCell tc = new TableCell();
                           tc.Text = results[x].FWWDIR_ROW + results[x].FWWDIR_ERR_INVOICE    +                                         results[x].FWWDIR_ERR_ACCOUNT;
                           tr.Cells.Add(tc);// = new TableCell();
                       }

你正在循环结果集的数组，但是你不能对结果[x]做一个foreach，因为foreach要求结果[x]是一个不可数的。基本上如果你要写：

foreach (string value in results){ 
   //logic here 
}

然后value获取存储在结果集的一个实例中的所有值。现在该值是您的字符串数组，您可以使用简单的for循环遍历值，请参阅下文：

      ServiceApUtils _apUtils = new ServiceApUtils();
           var   results = _apUtils.ADP_Processor(l_taxcode.ToArray(), l_amount.ToArray(),  l_row.ToArray());
                //Response.Write(results[0].)
             if (results[0].service_error!="")
             {
                 Response.Write(results[0].service_error);

             }//if the procedure has service errors
             else if (results.Count > 0)//
             {
                 foreach (var value in results){
                     TableRow tr = new TableRow();
                     Table1.Rows.Add(tr);
                       for (int i = 0; i < value.Length; i++{
                         //might have to update this logic as well:
                         TableCell tc = new TableCell();
                         tc.Text = value.FWWDIR_ROW + value.FWWDIR_ERR_INVOICE + value.FWWDIR_ERR_ACCOUNT;
                         tr.Cells.Add(tc);// = new TableCell();
                       }
      }