我想在点击特定行中的编辑按钮时绑定DropDownList。 DropDownList必须显示部门的名称。
但是当我按下模板中的编辑图像按钮时，DropDownList中的选定值始终只是该DropDownList中的第一个值。
ASPX：
<asp:GridView ID="gvEmployeeDetails" runat="server" Width="600px"
AutoGenerateColumns="false" ShowFooter="true"
OnRowDataBound ="RowDataBound"
onrowdeleting="gvEmployeeDetails_RowDeleting"
onrowupdating="gvEmployeeDetails_RowUpdating"
onrowcancelingedit="gvEmployeeDetails_RowCancelingEdit"
onrowediting="gvEmployeeDetails_RowEditing"
HeaderStyle-BackColor="#4D4D4D"
HeaderStyle-ForeColor="White">
<Columns>
<asp:TemplateField HeaderText="Employee ID">
<ItemTemplate>
<asp:Label ID="lblEmpID" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "empid") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:Label ID="lblEditEmpID" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "empid") %>'></asp:Label>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:Label ID="lblName" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "name") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEditName" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "name") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Designation">
<ItemTemplate>
<asp:Label ID="lblDesignation" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "designation") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEditDesignation" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "designation") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="City">
<ItemTemplate>
<asp:Label ID="lblCity" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "city") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEditCity" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "city") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Country">
<ItemTemplate>
<asp:Label ID="lblCountry" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "country") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEditCountry" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "country") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Departament">
<ItemTemplate>
<asp:Label ID="lblDep" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "department") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Action">
<ItemTemplate>
<asp:ImageButton ID="imgbtnEdit" runat="server" CommandName="Edit" ImageUrl="~/Images/icon-edit.png" Height="32px" Width="32px"/>
<asp:ImageButton ID="imgbtnDelete" runat="server" CommandName="Delete" ImageUrl="~/Images/Delete.png"/>
</ItemTemplate>
<EditItemTemplate>
<asp:ImageButton ID="imgbtnUpdate" runat="server" CommandName="Update" ImageUrl="~/Images/icon-update.png"/>
<asp:ImageButton ID="imgbtnCancel" runat="server" CommandName="Cancel" ImageUrl="~/Images/icon-Cancel.png"/>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
代码隐藏：
SqlConnection conn = new SqlConnection("Data Source=localhost;Database=testdb;Integrated Security=True");
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindData();
}
}
protected void BindData()
{
DataSet ds = new DataSet();
DataTable FromTable = new DataTable();
try
{
conn.Open();
string cmdstr = "select empid, name, designation,city,country,DepartmentDetails.depid as depid, department " +
" from EmployeeDetails inner join DepartmentDetails " +
" on EmployeeDetails.depid = DepartmentDetails.depid";
SqlCommand cmd = new SqlCommand(cmdstr, conn);
SqlDataAdapter adp = new SqlDataAdapter(cmd);
adp.Fill(ds);
cmd.ExecuteNonQuery();
FromTable = ds.Tables[0];
if (FromTable.Rows.Count > 0)
{
gvEmployeeDetails.DataSource = FromTable;
gvEmployeeDetails.DataBind();
}
else
{
FromTable.Rows.Add(FromTable.NewRow());
gvEmployeeDetails.DataSource = FromTable;
gvEmployeeDetails.DataBind();
int TotalColumns = gvEmployeeDetails.Rows[0].Cells.Count;
gvEmployeeDetails.Rows[0].Cells.Clear();
gvEmployeeDetails.Rows[0].Cells.Add(new TableCell());
gvEmployeeDetails.Rows[0].Cells[0].ColumnSpan = TotalColumns;
gvEmployeeDetails.Rows[0].Cells[0].Text = "No records Found";
}
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
finally
{
ds.Dispose();
conn.Close();
}
}
protected void gvEmployeeDetails_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
Label lblEmpID = (Label)gvEmployeeDetails.Rows[e.RowIndex].FindControl("lblEmpID");
conn.Open();
string cmdstr = "delete from EmployeeDetails where empid=@empid";
SqlCommand cmd = new SqlCommand(cmdstr, conn);
cmd.Parameters.AddWithValue("@empid", lblEmpID.Text);
cmd.ExecuteNonQuery();
conn.Close();
BindData();
}
protected void RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow && gvEmployeeDetails.EditIndex == e.Row.RowIndex)
{
DropDownList DropDownList1 = (DropDownList)e.Row.FindControl("DropDownList1");
// DropDownList DropDownList1 = (DropDownList)gvr.FindControl("DropDownList1");
Label lbldep = (Label)gvEmployeeDetails.Rows[e.Row.RowIndex].FindControl("lblDep");
using (SqlConnection con = new SqlConnection("Data Source=localhost;Database=testdb;Integrated Security=True"))
{
using (SqlCommand cmd = new SqlCommand("Select depid, department from DepartmentDetails"))
{
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
con.Open();
DropDownList1.DataSource = cmd.ExecuteReader();
DropDownList1.DataTextField = "department";
DropDownList1.DataValueField = "depid";
DropDownList1.DataBind();
// con.Close();
}
}
// get selected current department
DropDownList1.SelectedItem.Text = lbldep.Text.ToString();
}
}
protected void gvEmployeeDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
Label lblEditEmpID = (Label)gvEmployeeDetails.Rows[e.RowIndex].FindControl("lblEditEmpID");
TextBox txtEditName = (TextBox)gvEmployeeDetails.Rows[e.RowIndex].FindControl("txtEditName");
TextBox txtEditDesignation = (TextBox)gvEmployeeDetails.Rows[e.RowIndex].FindControl("txtEditDesignation");
TextBox txtEditCity = (TextBox)gvEmployeeDetails.Rows[e.RowIndex].FindControl("txtEditCity");
TextBox txtEditCountry = (TextBox)gvEmployeeDetails.Rows[e.RowIndex].FindControl("txtEditCountry");
DropDownList EditDepid = (DropDownList)gvEmployeeDetails.Rows[e.RowIndex].FindControl("DropDownList1");
conn.Open();
string cmdstr = "update EmployeeDetails set name=@name,designation=@designation,city=@city,country=@country, depid=@depid where empid=@empid";
SqlCommand cmd = new SqlCommand(cmdstr, conn);
cmd.Parameters.AddWithValue("@empid", lblEditEmpID.Text);
cmd.Parameters.AddWithValue("@name", txtEditName.Text);
cmd.Parameters.AddWithValue("@designation", txtEditDesignation.Text);
cmd.Parameters.AddWithValue("@city", txtEditCity.Text);
cmd.Parameters.AddWithValue("@country", txtEditCountry.Text);
cmd.Parameters.AddWithValue("@depid", EditDepid.SelectedValue);
cmd.ExecuteNonQuery();
conn.Close();
gvEmployeeDetails.EditIndex = -1;
BindData();
}
protected void gvEmployeeDetails_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
gvEmployeeDetails.EditIndex = -1;
BindData();
}
protected void gvEmployeeDetails_RowEditing(object sender, GridViewEditEventArgs e)
{
gvEmployeeDetails.EditIndex = e.NewEditIndex;
BindData();
}
我尝试过很多方法来设置标签文字中的所选项目，但没有运气。有没有人有任何想法？
答案 0 :(得分：0)
设置DropDownList的选定项可能会造成混淆。你在做什么实际上只是设置所选项目的文本。您实际上并没有告诉DropDownList您想要选择其他项目。
您需要做的是告诉DropDownList您想要选择哪个项目。这是一种方法：
DropDownList1.SelectedIndex = DropDownList1.Items.IndexOf(DropDownList1.Items.FindByText(lbldep.Text));
答案 1 :(得分：0)
我通常在ASPX代码中设置DropDownList的SelectedValue，如下所示
<asp:DropDownList ID="DropDownList1" runat="server" SelectedValue='<%# Bind("empid") %>'></asp:DropDownList>
即使您将ddl与数据源中的列表绑定在一起，只要在页面加载时绑定了ddl，它就会选择SelectedValue（如果它存在于列表中）。