Question

我有一个gridview我想要的是，

当我插入一行包含某些值时，我想在textbox

之外的gridview中显示其总值

我尝试的是下面，

我创建了一个用于计算文本框的函数。如下所示

private void GrandPaidTotal()
{
    float GTotal = 0f;

    for (int i = 0; i < GridPayInfo.Rows.Count; i++)
    {
        String total = (GridPayInfo.Rows[i].FindControl("txtPayamt") as TextBox).Text;
        GTotal += Convert.ToSingle(total);
    }
    txtTotalPaidAmt.Value = GTotal.ToString();
}

我在Page_load上调用了这个函数。但是在调试时我得到了错误

对象引用未设置为对象的实例。

在第

行

for (int i = 0; i < GridPayInfo.Rows.Count; i++)

请告诉我，如何实施。

更新

填充网格的逻辑

protected void GridPayInfo_InsertCommand(object sender, GridRecordEventArgs e)
{
    int iRowCountPay = 0;

    if (Session["payInfo"] != null)
    {
        dtpayInfo = (DataTable)Session["payInfo"];
    }
    else
    {
        BindDataTable();
    }

    iRowCountPay = dtpayInfo.Rows.Count;
    DataRow newRowPay = dtpayInfo.NewRow();
    newRowPay["SR_NO"] = iRowCountPay + 1;

    newRowPay["TYPE_ID"] = Convert.ToString(e.Record["TYPE"]);
    //newRowPay["TYPE"] = Convert.ToString(e.Record["TYPE"]);
    newRowPay["TYPE"] = CF.ExecuteScaler2("Select type_desc from type_mst where Type_Code = 'AGR' and Type_Abbr ='" + Convert.ToString(e.Record["TYPE"]) + "'").ToString();
    newRowPay["VENDOR_NAME"] = Convert.ToString(e.Record["VENDOR_NAME"]);
    newRowPay["AGRMT_AMT"] = Convert.ToString(e.Record["AGRMT_AMT"]);
    newRowPay["PAYABLE_AMT"] = Convert.ToString(e.Record["PAYABLE_AMT"]);
    newRowPay["PAID_AMT"] = Convert.ToString(e.Record["PAID_AMT"]);
    newRowPay["EXP_TYPE_E_ID"] = Convert.ToString(e.Record["EXP_TYPE"]);
    newRowPay["EXP_TYPE"] = CF.ExecuteScaler2("select DESCRIPTION from fnd_flex_values_vl where FLEX_VALUE_MEANING = '" + Convert.ToString(e.Record["EXP_TYPE"]) + "'").ToString();
    newRowPay["REMARKS"] = Convert.ToString(e.Record["REMARKS"]);
    newRowPay["TRAN_DT"] = Convert.ToString(e.Record["TRAN_DT"]);
    newRowPay["VOUCHER_NO"] = Convert.ToString(e.Record["VOUCHER_NO"]);
    newRowPay["CHEQUE_NO"] = Convert.ToString(e.Record["CHEQUE_NO"]);
    newRowPay["CHEQUE_DT"] = Convert.ToString(e.Record["CHEQUE_DT"]);
    newRowPay["CHQ_FAV_NAME"] = Convert.ToString(e.Record["CHQ_FAV_NAME"]);

    dtpayInfo.Rows.Add(newRowPay);
    GridPayInfo.DataSource = dtpayInfo;
    GridPayInfo.DataBind();
    AddToViewState("GridPayInfo");
}

  public void AddToViewState(string strGrid)
{
    if (strGrid == "GrdPartyInfo")
    {
        Session["partyInfo"] = dtPartyInfo;
    }
    if (strGrid == "GridPayInfo")
    {
        Session["payInfo"] = dtpayInfo;
    }

    if (strGrid == "GridExpInfo")
    {
        Session["ExpInfo"] = dtExpInfo;
    }
}

Answer 1

使用OnRowDataBound事件可能更容易。

    int totalCount = 0;
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            DataRowView drv = e.Row.DataItem as DataRowView;
            totalCount += Convert.ToInt32(drv["txtPayamt"]);
        }
        TextBox1.Text = "Total count is: " + totalCount;
    }

更新

做了一些进一步的测试。如果GridView包含更复杂的功能（编辑，插入），上面的代码似乎不能正常工作。它每行调用RowDataBound多次。这个新代码段的工作方式是循环行并使用FindControl。此函数需要在添加新行后调用DataBind。

    private void countItemsInGrid()
    { 
        int totalCount = 0;
        for (int i = 0; i < SettingsB.Rows.Count; i++)
        {
            TextBox tb = SettingsB.Rows[i].FindControl("txtPayamt") as TextBox;
            try
            {
                totalCount += Convert.ToInt32(tb.Text);
            }
            catch
            {
            }
        }
        TextBox1.Text = "Total count is: " + totalCount;
    }

在gridview

1 个答案: