GridView的EditItemTemplate中的DropDownList获取的SelectedValue [英] Gridview EditItemTemplate DropDownList Get SelectedValue
问题描述
在我的GridView我有以下模板字段：
＆LT; ASP：的TemplateField的HeaderText =系codeSORTEX pression =系code＆GT;
＆LT;＆ItemTemplate中GT;
＆LT;％＃的eval（系code）％GT;
＆LT; / ItemTemplate中＆GT;
＆LT;＆EditItemTemplate的GT;
＆LT; ASP：DropDownList的ID =ddlDept code=服务器
的SelectedValue ='＆LT;％＃的eval（系code）％GT;'
数据源='＆LT;％＃GetAllDepartments（）％GT;'
DataTextField =系code
DataValueField =系code/＆GT;
＆LT; / EditItemTemplate中＆GT;
＆LT; / ASP：的TemplateField＆GT;
当我点击编辑某一行上它填充了所有值将DropDownList并选择该行的正确值这个伟大工程。
然而，当我尝试更新该行： OnRowUpdating =UpdateRow
保护无效UpdateRow（对象发件人，GridViewUpdateEventArgs E）
{
GridViewRow行= UserGV.Rows [e.RowIndex]
DropDownList的DDL = row.FindControl（ddlDept code）作为DropDownList的;
串部门code = ddl.SelectedValue;
}
它发现DropDownList控件，但SelectedValue的始终是一个空字符串。结果
我需要访问到所选择的值，保存到数据库中。
任何想法，我怎么能得到一个DropDownList的SelectedValue的在GridView在code后面？
编辑：结果
您还可以填充从后面code将DropDownList和SelectedValue的：
保护无效gv_RowDataBound（对象发件人，GridViewRowEventArgs E）
{
如果（e.Row.RowType == DataControlRowType.DataRow）
{
如果（（e.Row.RowState＆放大器; DataControlRowState.Edit）大于0）
{
VAR deptMgr =新DepartmentMgr（）;
清单＆LT;＆系GT;部门= deptMgr.GetAllDepartments（）;
DropDownList的ddList =（DropDownList的）e.Row.FindControl（ddlDept code）;
ddList.DataSource =部门;
ddList.DataTextField =系code;
ddList.DataValueField =系code;
ddList.DataBind（）; 。字符串userDept code =的DataBinder.Eval（e.Row.DataItem，部code）的ToString（）;
ddList.SelectedItem.Text = userDept code;
ddList.SelectedValue = userDept code;
}
}
}
我是用一个黑客位，以获得对表标题第二头时绑定GridView的：
GridViewRow行=新GridViewRow（0，-1，DataControlRowType.Header，DataControlRowState.Normal）;
第的TableCell =新TableHeaderCell（）;
th.HorizontalAlign = HorizontalAlign.Center;
th.ColumnSpan = UserGV.Columns.Count;
th.BackColor = Color.SteelBlue;
th.ForeColor = Color.White;
th.Font.Bold = TRUE;
th.Text =管理用户;
row.Cells.Add（次）;
InnerTable.Rows.AddAt（0，行）;
我不完全了解这是与得到一个DropDownList控件的SelectedValue的，但只要干扰我评论说出来它开始工作。
对于那些有兴趣，我得到了第二头与该工作采用了不同的方法：
在我添加这到GridView .aspx文件：
OnRowCreated =CreateRow
而在code后面我加了下面的方法：
保护无效CreateRow（对象发件人，GridViewRowEventArgs E）
{
如果（e.Row.RowType == DataControlRowType.Header）
{
GridView控件的GridView =（GridView的）发件人;
GridViewRow行=新GridViewRow（1,0，DataControlRowType.Header，DataControlRowState.Normal）;
第的TableCell =新TableHeaderCell（）;
th.HorizontalAlign = HorizontalAlign.Center;
th.ColumnSpan = UserGV.Columns.Count;
th.ForeColor = Color.White;
th.BackColor = Color.SteelBlue;
th.Font.Bold = TRUE;
th.Text =管理用户;
row.Cells.Add（次）; gridView.Controls [0] .Controls.AddAt（0，行）;
}
}
现在一切正常。
In my Gridview I have the following template field:
<asp:TemplateField HeaderText="Dept Code" SortExpression="DeptCode">
<ItemTemplate>
<%# Eval("DeptCode") %>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlDeptCode" runat="server"
SelectedValue='<%# Eval("DeptCode") %>'
DataSource='<%# GetAllDepartments() %>'
DataTextField="DeptCode"
DataValueField="DeptCode" />
</EditItemTemplate>
</asp:TemplateField>
This works great when I click Edit on a row it populates the DropDownList with all values and selects the correct value for that row.
However, when I try to update the row: OnRowUpdating="UpdateRow"
protected void UpdateRow(object sender, GridViewUpdateEventArgs e)
{
GridViewRow row = UserGV.Rows[e.RowIndex];
DropDownList ddl = row.FindControl("ddlDeptCode") as DropDownList;
string deptCode = ddl.SelectedValue;
}
It finds the DropDownList control but the SelectedValue is always an empty string.
I need access to the selected value to save to the database.
Any ideas as to how I can get the SelectedValue of a DropDownList in a Gridview in code behind?
Edit:
You can also populate the DropDownList and SelectedValue from the code behind:
protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
if ((e.Row.RowState & DataControlRowState.Edit) > 0)
{
var deptMgr = new DepartmentMgr();
List<Department> departments = deptMgr.GetAllDepartments();
DropDownList ddList = (DropDownList)e.Row.FindControl("ddlDeptCode");
ddList.DataSource = departments;
ddList.DataTextField = "DeptCode";
ddList.DataValueField = "DeptCode";
ddList.DataBind();
string userDeptCode = DataBinder.Eval(e.Row.DataItem, "DeptCode").ToString();
ddList.SelectedItem.Text = userDeptCode;
ddList.SelectedValue = userDeptCode;
}
}
}
I was using a bit of a hack to get a second header for the table title when binding the gridview:
GridViewRow row = new GridViewRow(0, -1, DataControlRowType.Header, DataControlRowState.Normal);
TableCell th = new TableHeaderCell();
th.HorizontalAlign = HorizontalAlign.Center;
th.ColumnSpan = UserGV.Columns.Count;
th.BackColor = Color.SteelBlue;
th.ForeColor = Color.White;
th.Font.Bold = true;
th.Text = "Manage Users";
row.Cells.Add(th);
InnerTable.Rows.AddAt(0, row);
I don't completely understand how this was interfering with getting the SelectedValue of a DropDownList control but as soon as I commented that out it started working.
For those interested I got the second header working with this using a different approach:
In the .aspx file I added this to the Gridview:
OnRowCreated="CreateRow"
And in the code behind I added the following method:
protected void CreateRow(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
GridView gridView = (GridView)sender;
GridViewRow row = new GridViewRow(1, 0, DataControlRowType.Header, DataControlRowState.Normal);
TableCell th = new TableHeaderCell();
th.HorizontalAlign = HorizontalAlign.Center;
th.ColumnSpan = UserGV.Columns.Count;
th.ForeColor = Color.White;
th.BackColor = Color.SteelBlue;
th.Font.Bold = true;
th.Text = "Manage Users";
row.Cells.Add(th);
gridView.Controls[0].Controls.AddAt(0, row);
}
}
Everything is working correctly now.
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