无法从 Gridview 获取值

Question

我想通过我的 gridview 进行更新操作，但我无法弄明白。

我的gridview是这样的：

<asp:GridView ID="GridView1" runat="server" ShowFooter="True" AutoGenerateColumns="False" DataKeyNames="ID"
                OnDataBinding="GridView1_DataBinding"
                OnRowDeleting="GridView1_RowDeleting"
                OnRowEditing="GridView1_RowEditing"
                OnRowUpdating="GridView1_RowUpdating">
                <Columns>
                    <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
                    <asp:BoundField DataField="ID" HeaderText="ID" ReadOnly="True" SortExpression="UserID" />
                    <asp:BoundField DataField="UserName" HeaderText="UserName" SortExpression="UserName" />
                    <asp:BoundField DataField="UserPW" HeaderText="UserPW" SortExpression="UserPW" />
                    <asp:BoundField DataField="UserType" HeaderText="UserType" SortExpression="UserType" />
                </Columns>
            </asp:GridView>

我的 add/delete 工作正常但是更新有问题，例如从网格中获取空值。我尝试了 3 种不同的方法来获取值。注释行给了我 NullReferenceException 而未注释行没有，但它们持有的值是空字符串。

这是我的 aspx.cs 更新。（我使用的是 GridView 的 Edit/Update）

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
        {
            GridView1.EditIndex = e.NewEditIndex;
            GridView1.DataBind();
        }

        protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            int userID = Convert.ToInt32(this.GridView1.DataKeys[e.RowIndex]["ID"]);
            var UserOperations = new ModelOperations.UserList.UserListOperations();

            //TextBox uname = (TextBox)this.GridView1.Rows[e.RowIndex].FindControl("UserName");
            string uname = this.GridView1.Rows[e.RowIndex].Cells[2].Text;
            string upw = this.GridView1.Rows[e.RowIndex].Cells[3].Text;
            //string uname = this.GridView1.SelectedRow.Cells[2].Text;
            //string upw = this.GridView1.SelectedRow.Cells[3].Text;
            //TextBox upw = (TextBox)this.GridView1.Rows[e.RowIndex].FindControl("UserPW");

            var result = UserOperations.updateUser(userID, uname, upw);
            GridView1.EditIndex = -1;
            GridView1.DataBind();
        }

Answer 1

尝试：

string uname = e.NewValues["UserName"];
string upw = e.NewValues["UserPW"];

如果你愿意，你甚至可以将它与e.OldValues进行比较。

无法从 Gridview 获取值

Can't get value from Gridview

c#

asp.net

gridview