Question

无法将类型为“System.Web.UI.LiteralControl”的对象强制转换为类型“System.Web.UI.WebControls.TextBox

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
SqlConnection conn = Connection.Connect();
string sqlstr = "update cpxx set cpname='"
+ ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text .ToString().Trim() + "',liuti='"
+ ((TextBox)(GridView1.Rows[e.RowIndex].Cells[2].Controls[0])).Text .ToString().Trim() + "',weidu='"
+ ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text .ToString().Trim() + "',tedian='"
+ ((TextBox)(GridView1.Rows[e.RowIndex].Cells[4].Controls[0])).Text .ToString().Trim() + "',zhuansu='"
+ ((TextBox)(GridView1.Rows[e.RowIndex].Cells[5].Controls[0])).Text .ToString().Trim() + "' where id='"
+ GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
SqlCommand cmd = new SqlCommand(sqlstr, conn);
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
GridView1.EditIndex = -1;
bind();

Answer 1

GridView1.Rows[e.RowIndex].Cells[1].Controls[0]是System.Web.UI.LiteralControl类型，不是TextBox，所以报错，建议用FindControl找textbox