c# - 通过 RowUpdating 在数据表中设置值

Question

 protected void gd_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            TextBox txtAuthor;
            TextBox txtBook;
            dt = new DataTable();
            dt=(DataTable)ViewState["dt"];
            GridViewRow gdr = gd.Rows[e.RowIndex];
            if (gdr != null)
            {
                txtAuthor = (TextBox)gd.Rows[e.RowIndex].FindControl("txtAuthor1");
                txtBook = (TextBox)gd.Rows[e.RowIndex].FindControl("txtBook1");
                dt = (DataTable)ViewState["dt"];
                string txtAuthorName;
                string txtBookName;


            if (txtAuthor != null && txtBook!=null)
            {
                txtAuthorName = txtAuthor.Text;
                txtBookName = txtBook.Text;

                int i=0;
                dt = (DataTable)Session["dt"];
                for (; i < gd.Rows.Count; i++)
                {
                    if (e.RowIndex == i)
                    {
                        dt.Rows[i][0] = txtAuthor.Text;
                        dt.Rows[i][1] = txtBook.Text;
                        ViewState["dt"] = dt;
                        gd.DataSource = dt;
                        gd.DataBind();
                    }
                }
            }

        }

        dt = (DataTable)ViewState["dt"];
        gd.DataSource = dt;
        gd.DataBind();
    }

Answer 1

该错误可能是因为试图访问一行不存在的数据表。要将值分配给datatable行，您必须检查是否有该行，datatable您正在检查行grid而不是datatable您不需要循环，因为您可以直接访问datatable具有索引的行，只需检查是否e.RowIndex是有效的行索引datatable。

if (e.RowIndex <= dt.Rows.Count)
{
    dt.Rows[e.RowIndex][0] = txtAuthor.Text;
    dt.Rows[e.RowIndex][1] = txtBook.Text;
    ViewState["dt"] = dt;
    gd.DataSource = dt;
    gd.DataBind();
}