C# Gridview EditItemTemplate下拉列表Get SelectedValue
在我的Gridview中,我有以下模板字段:C# Gridview EditItemTemplate下拉列表Get SelectedValue,c#,asp.net,gridview,selectedvalue,edititemtemplate,C#,Asp.net,Gridview,Selectedvalue,Edititemtemplate,在我的Gridview中,我有以下模板字段: <asp:TemplateField HeaderText="Dept Code" SortExpression="DeptCode"> <ItemTemplate> <%# Eval("DeptCode") %> </ItemTemplate> <EditItemTemplate> <asp:DropDownList ID="d
<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>
它查找DropDownList控件,但SelectedValue始终为空字符串。我需要访问选定的值才能保存到数据库 关于如何在代码隐藏中获得Gridview中DropDownList的SelectedValue,有什么想法吗 编辑:
您还可以从代码隐藏中填充DropDownList和SelectedValue:
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;
}
}
}
受保护的void gv_RowDataBound(对象发送方,GridViewRowEventArgs e)
{
如果(e.Row.RowType==DataControlRowType.DataRow)
{
如果((e.Row.RowState和DataControlRowState.Edit)>0)
{
var deptMgr=新部门经理();
List departments=deptMgr.GetAllDepartments();
DropDownList ddList=(DropDownList)e.Row.FindControl(“ddlDeptCode”);
ddList.DataSource=部门;
ddList.DataTextField=“DeptCode”;
ddList.DataValueField=“DeptCode”;
ddList.DataBind();
字符串userDeptCode=DataBinder.Eval(例如Row.DataItem,“DeptCode”).ToString();
ddList.SelectedItem.Text=userDeptCode;
ddList.SelectedValue=userDeptCode;
}
}
}
绑定gridview时,我使用了一些技巧来获取表标题的第二个标题:
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);
我不完全理解这是如何干扰获取DropDownList控件的SelectedValue的,但我一评论它就开始工作了
对于那些感兴趣的人,我用另一种方法得到了第二个标题:
在.aspx文件中,我将其添加到Gridview中:
OnRowCreated="CreateRow"
在代码隐藏中,我添加了以下方法:
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);
}
}
现在一切正常。在编辑模板中,从数据绑定中设置
selectedvalue
,然后您将获得正确的选定值,而不是空值
SelectedValue='<%# Bind("DeptCode") %>'
SelectedValue=''
您是从同一个gridview表还是从另一个表填充dropdownlist?我明白了,因为我用xml创建了一个简单的数据库,创建了两个表,然后完全尝试了您的代码,它工作正常,正确显示了值,所以我不确定问题出在哪里,但我会上传我制作的简单项目,也许到时候你能找到答案。我仍然怀疑你的问题是数据库值,而不是dropdownlist的设计和访问,无论如何,请从这里下载示例:我希望它对您有所帮助。好吧,然后等待更新。是的,您现在知道这个问题确实很奇怪,但很好,至于添加第二个标题的替代方法,我已经在这里使用此方法,只需复制RowCreated&AddMergedCell方法并修改它们以满足您的需要。我现在得走了,但我希望你能解决这个问题,坚持下去。谢谢@Baxter为我节省时间:)不确定这是否与将来访问此线程的人有关,但我遇到了一个问题,即GridView(templatefield)的dropdownlist(ddl)中的SelectedIndex在单击编辑模式时还原为第一个索引(丢失数据库值/SelectedIndex)@Baxter问题中的编辑注释/示例代码帮助我认识到,我在ddl datatbind之前设置SelectedIndex,而在ddl datatbind之后设置SelectedIndex。我花了好几天的时间想弄明白!
SelectedValue='<%# Bind("DeptCode") %>'