[英]Can't get value from Gridview
我想通过gridview进行更新操作,但我无法理解。
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>
我的添加/删除工作正常,但更新有问题,如从网格中获取空值。 我尝试了3种不同的方法来获得价值。 注释行给了我NullReferenceException,而未注释的行没有,但他们持有的值是空字符串。
这是我的aspx.cs更新。(我正在使用GridView的编辑/更新)
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();
}
尝试:
string uname = e.NewValues["UserName"];
string upw = e.NewValues["UserPW"];
如果需要,您甚至可以将其与e.OldValues
进行比较。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.