DataGrid常见解决方案:在分页状态下删除纪录的问题

在使用DataGrid分页的时候，正常情况下，绑定数据库列表纪录时会自动产生分页的效果，然而我发觉在删除纪录的时候总会发生"无效的 CurrentPageIndex 值。它必须大于等于 0 且小于 PageCount。"的异常，其实解决这个问题很简单，我们要做的就是在DataGrid1_DeleteCommand事件中判断CurrentPageIndex的值，并根据不同的结果来绑定DataGrid。

 //检索数据库的函数
  public DataSet GetZcbd()
  {
   try
   {
    DataSet ds=new DataSet();   
    string searchString="select id,yy,bj from zc";
    da=new OleDbDataAdapter(searchString,conn);
    da.Fill(ds,"yy");    
    return ds;
   }
   catch
   {
    return null;    
   }  
           
  }

 //绑定DataGrid   
private void BindGrid()
  {
   DataSet ds = new DataSet();
   ds = us.GetZcbd();
   if (ds!=null)
   {
    this.DataGrid1.DataSource = ds;
    this.DataGrid1.DataBind();
   }
   else
   {
    msg.Alert("加载数据错误！",Page);
   }
  }

//删除数据库纪录函数
  public string DeleteZcbd(int bdID)
  {

   int count = this.IfExiseZysx(bdID);//不必理会次句，默认count=1
   if (count <= 0) return "false";
   else
   {
    string sqlStr = "delete from zcwhere id="+bdID;
    OleDbCommand cmd = new OleDbCommand(sqlStr,conn);

    conn.Open();

    try
    {
     cmd.ExecuteNonQuery();
     return "true";
    }
    catch(Exception e)
    {
     return e.Message.ToString();
    }
    finally
    {
     conn.Close();
    }      
   }
  }

// DataGrid1_DeleteCommand事件修改函数  
private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   int bdID = int.Parse(DataGrid1.DataKeys[(int)e.Item.ItemIndex].ToString());
   string isDel = us.DeleteZcbd(bdID);
   int CurrentPage = 0;
   if (isDel == "true")
   {
    if(this.DataGrid1.CurrentPageIndex == this.DataGrid1.PageCount -1)
    {
   if (this.DataGrid1.CurrentPageIndex == 0)
    {
     this.DataGrid1.CurrentPageIndex = this.DataGrid1.PageCount -1;
    }
    else
    {
     if (this.DataGrid1.Items.Count % this.DataGrid1.PageSize == 1)
     {
      CurrentPage = 2;
     }
     else
     {
      CurrentPage = 1;
     }
     this.DataGrid1.CurrentPageIndex = this.DataGrid1.PageCount - CurrentPage;
    }
   }
    this.BindGrid();
   }
   else
   {
       msg.Alert("删除数据错误！",Page);
   }
 
  }
    注释：msg为一个类似WinForm的messagebox对话框，不必理会。可以使用label.Text代替

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