Question

这是数据表：

 DataTable dtemp = new DataTable();

 dtemp = objDB.SelectEmployeeSalaryByYear11(Convert.ToInt32(ddlyear.SelectedValue));

我正在尝试这个，但显示问题..

   Int32 dtemps = int.Parse(dtemp.Rows[i]["ID"].ToString());

and
 Int32 dtemps = Convert.ToInt32(dtemp.Rows[i]["ID"].ToString());

那么如何将datatatble列id转换为int？

是完整的代码：

  protected void btnSave_Click(object sender, EventArgs e)
    {
        string result = string.Empty;
        string upld = string.Empty;
        int i = 0;
        try
        {
            foreach (GridViewRow gvr in grdSalary.Rows)
            {
                DataTable dtemp = new DataTable();
                dtemp = objDB.SelectEmployeeSalaryByYear11(Convert.ToInt32(ddlyear.SelectedValue));
                Int32 dtemps = Convert.ToInt32(dtemp.Rows[i]["ID"].ToString());
                Int32 empId = Convert.ToInt32(grdSalary.DataKeys[gvr.RowIndex]["EID"]);
                DataTable dtempcount = new DataTable();
                dtempcount = objDB.SelectEmployeeSalaryByEmpIDYear11(Convert.ToInt32(ddlyear.SelectedValue), empId);

                TextBox txtjan = gvr.FindControl("txtjan") as TextBox;
                TextBox txtfeb = gvr.FindControl("txtfeb") as TextBox;
                TextBox txtmarch = gvr.FindControl("txtmarch") as TextBox;
                TextBox txtapril = gvr.FindControl("txtapril") as TextBox;
                TextBox txtmay = gvr.FindControl("txtmay") as TextBox;
                TextBox txtjune = gvr.FindControl("txtjune") as TextBox;
                TextBox txtjuly = gvr.FindControl("txtjuly") as TextBox;
                TextBox txtaug = gvr.FindControl("txtaug") as TextBox;
                TextBox txtsept = gvr.FindControl("txtsept") as TextBox;
                TextBox txtoct = gvr.FindControl("txtoct") as TextBox;
                TextBox txtnov = gvr.FindControl("txtnov") as TextBox;
                TextBox txtdec = gvr.FindControl("txtdec") as TextBox;


                if (dtempcount.Rows.Count == 0)
                {

                    Int32 Intuserid = objDB.insert_updateSalary(0, Convert.ToInt32(grdSalary.DataKeys[gvr.RowIndex]["EID"]), Convert.ToInt32(ddlyear.SelectedValue),
                        txtjan.Text, txtfeb.Text, txtmarch.Text, txtapril.Text, txtmay.Text, txtjune.Text, txtjuly.Text, txtaug.Text,
                        txtsept.Text, txtoct.Text, txtnov.Text, txtdec.Text);


                }
                else
                {
                    try
                    {
                       // Int32 Intuserid = objDB.insert_updateSalary(Convert.ToInt32(dtemp.Rows[i]["ID"]), Convert.ToInt32(grdSalary.DataKeys[gvr.RowIndex]["EID"]), Convert.ToInt32(ddlyear.SelectedValue),
                       //txtjan.Text, txtfeb.Text, txtmarch.Text, txtapril.Text, txtmay.Text, txtjune.Text, txtjuly.Text, txtaug.Text,
                       //txtsept.Text, txtoct.Text, txtnov.Text, txtdec.Text);
                        Int32 Intuserid = objDB.insert_updateSalary(int.Parse(dtemp.Rows[i]["ID"].ToString()), Convert.ToInt32(grdSalary.DataKeys[gvr.RowIndex]["EID"]), Convert.ToInt32(ddlyear.SelectedValue),
                      txtjan.Text, txtfeb.Text, txtmarch.Text, txtapril.Text, txtmay.Text, txtjune.Text, txtjuly.Text, txtaug.Text,
                      txtsept.Text, txtoct.Text, txtnov.Text, txtdec.Text);

                    }
                    catch (Exception ex)
                    {
                        throw ex;
                    }
                }
                i++;
            }
        }
        catch (Exception ex)
        {
            Response.Redirect("Error.aspx");
        }
    }

我想更新或插入数据到DATATABSE ..

问题是当Int32 dtemps变为零时显示输入字符串的格式不正确..

Answer 1

尝试克隆数据表，然后更改列的类型，如

DataTable mydt = dtemp.Clone();
mydt.Columns[0].DataType = typeof(Int32);
foreach (DataRow row in dtemp.Rows) 
{
    mydt.ImportRow(row);
}

Answer 2

您的DataTable可能是空的，这就是它无法正常工作的原因。

Check Row i小于RowCount，例如：

if (dtempcount.Rows.Count > i)

如何将datatable列id更改为int（typeconversion）

2 个答案: