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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