0

我有这个问题:

[InvalidOperationException: No data exists for the row / column.]
   System.Data.OleDb.OleDbDataReader.DoValueCheck(Int32 ordinal) +1029063
   System.Data.OleDb.OleDbDataReader.GetInt32(Int32 ordinal) +12
   ASP.addsousvoyage_aspx.hdVoyage_SelectedIndexChanged(Object sender, EventArgs e) in C:\Users\ZiGi\Desktop\VisualDesign\addSousVoyage.aspx:222
   System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(EventArgs e) +111
   System.Web.UI.WebControls.DropDownList.RaisePostDataChangedEvent() +134
   System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() +10
   System.Web.UI.Page.RaiseChangedEvents() +165
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1485

当我这样做时:

MsgBox(myReader1.GetInt32(0).ToString)

即使 :

MsgBox(myReader1.FieldCount) 返回 1 作为值,并且 field(0) 是整数。

有什么问题 ?

4

1 回答 1

1

你忘了做一个 myReader1.Read() 吗?我认为当它被遗忘时可能会发生此错误。

于 2010-05-28T12:06:32.277 回答