在 RowCommand 上填充 DDL
Fill DDL on RowCommand
我有一个带有 rowcommand
和 linkbutton
的网格视图。当我按下链接按钮时,该行被编辑,但是 DDL 应该将数据与我的数据库表中的值绑定,但这不起作用
我不知道这是否是正确的方法,但我在按链接按钮时确实遇到了错误
“对象引用未设置到对象的实例。”但我认为这不是这里的主要问题。
从 Rowcommand 编辑时我应该绑定我的 DDL 行吗?或者任何人都可以看到我做错了什么吗?
DDL 列的 ASPX 标记:
<asp:TemplateField HeaderText="Status">
<EditItemTemplate>
<asp:DropDownList ID="ddlStatusRow" AppendDataBoundItems="True" runat="server" >
<asp:ListItem>Status</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="rfEditStatus" runat="server" ErrorMessage ="Status is a required field"
ControlToValidate="ddlStatusRow" Text="*" ForColor="Red" InitialValue="Status">
</asp:RequiredFieldValidator>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Status") %>'></asp:Label>
</ItemTemplate>
<HeaderStyle BackColor="#E6E6E6" Font-Bold="False" Font-Names="Arial" Font-Size="14px" ForeColor="Black" />
<ItemStyle Font-Size="12px" HorizontalAlign="Center" Width="4%" />
</asp:TemplateField>
代码隐藏:
protected void gwUnplannedActivities_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "EditRow")
{
int rowIndex = ((GridViewRow)((LinkButton)e.CommandSource).NamingContainer).RowIndex;
gwUnplannedActivities.EditIndex = rowIndex;
BindGridViewUnplannedActivities();
GridViewRow row = ((e.CommandSource as Control).NamingContainer as GridViewRow);
DropDownList ddlStatusRow = (DropDownList)row.Cells[3].FindControl("ddlStatusRow");
string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
SqlCommand cmd = new SqlCommand("SELECT * FROM ....", con);
con.Open();
ddlStatusRow.DataSource = cmd.ExecuteReader();
ddlStatusRow.DataTextField = "Status";
ddlStatusRow.DataBind();
}
}
else if (e.CommandName == "CancelUpdate")
{
//somecode....
}
else if (e.CommandName == "UpdateRow")
{
//somecode....
}
}
使用这个
GridView gv = (GridView)sender;
DropDownList ddlStatusRow = (DropDownList)gv.Rows[rowIndex].FindControl("ddlStatusRow");
而不是
GridViewRow row = ((e.CommandSource as Control).NamingContainer as GridViewRow);
DropDownList ddlStatusRow = (DropDownList)row.Cells[3].FindControl("ddlStatusRow");
问题是Edit Index已经设置好了,所以row
不会再退出了,因为它已经被Editable Row代替了。
我有一个带有 rowcommand
和 linkbutton
的网格视图。当我按下链接按钮时,该行被编辑,但是 DDL 应该将数据与我的数据库表中的值绑定,但这不起作用
我不知道这是否是正确的方法,但我在按链接按钮时确实遇到了错误 “对象引用未设置到对象的实例。”但我认为这不是这里的主要问题。
从 Rowcommand 编辑时我应该绑定我的 DDL 行吗?或者任何人都可以看到我做错了什么吗?
DDL 列的 ASPX 标记:
<asp:TemplateField HeaderText="Status">
<EditItemTemplate>
<asp:DropDownList ID="ddlStatusRow" AppendDataBoundItems="True" runat="server" >
<asp:ListItem>Status</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="rfEditStatus" runat="server" ErrorMessage ="Status is a required field"
ControlToValidate="ddlStatusRow" Text="*" ForColor="Red" InitialValue="Status">
</asp:RequiredFieldValidator>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Status") %>'></asp:Label>
</ItemTemplate>
<HeaderStyle BackColor="#E6E6E6" Font-Bold="False" Font-Names="Arial" Font-Size="14px" ForeColor="Black" />
<ItemStyle Font-Size="12px" HorizontalAlign="Center" Width="4%" />
</asp:TemplateField>
代码隐藏:
protected void gwUnplannedActivities_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "EditRow")
{
int rowIndex = ((GridViewRow)((LinkButton)e.CommandSource).NamingContainer).RowIndex;
gwUnplannedActivities.EditIndex = rowIndex;
BindGridViewUnplannedActivities();
GridViewRow row = ((e.CommandSource as Control).NamingContainer as GridViewRow);
DropDownList ddlStatusRow = (DropDownList)row.Cells[3].FindControl("ddlStatusRow");
string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
SqlCommand cmd = new SqlCommand("SELECT * FROM ....", con);
con.Open();
ddlStatusRow.DataSource = cmd.ExecuteReader();
ddlStatusRow.DataTextField = "Status";
ddlStatusRow.DataBind();
}
}
else if (e.CommandName == "CancelUpdate")
{
//somecode....
}
else if (e.CommandName == "UpdateRow")
{
//somecode....
}
}
使用这个
GridView gv = (GridView)sender;
DropDownList ddlStatusRow = (DropDownList)gv.Rows[rowIndex].FindControl("ddlStatusRow");
而不是
GridViewRow row = ((e.CommandSource as Control).NamingContainer as GridViewRow);
DropDownList ddlStatusRow = (DropDownList)row.Cells[3].FindControl("ddlStatusRow");
问题是Edit Index已经设置好了,所以row
不会再退出了,因为它已经被Editable Row代替了。