Question

我有一个名为Employees的数据库表，其中包含每个员工的ID号，名字，姓氏和SupervisorID。为员工存储的SupervisorID等于该员工主管的ID号。

我想要一个可以为员工编辑这些字段的DetailsView控件。 Supervisor字段需要是一个下拉列表，将SupervisorID存储为值，并显示主管的名字和姓氏作为文本。

我已经环顾了很多，并且能够弄清楚如何创建下拉列表以选择并显示SupervisorID。我遇到的问题是如何更改下面的代码来存储SupervisorID，但是将主管的名字显示为文本？

以下是我的DetailsList中的Supervisor下拉列表的代码：

<asp:TemplateField HeaderText="Supervisor" SortExpression="SupervisorID">
             <EditItemTemplate>
                <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource3" DataTextField="SupervisorID" DataValueField="SupervisorID" SelectedValue='<%# Bind("SupervisorID") %>'>
                </asp:DropDownList>
                <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:dbConnectionString %>" SelectCommand="SELECT [SupervisorID] FROM [Employees]"></asp:SqlDataSource>
             </EditItemTemplate>
             <ItemTemplate >
                <asp:Label Runat="server" Text='<%# Bind("SupervisorID") %>' ID="Label1"></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>

对于我可以改变以实现目标的任何想法？谢谢你的帮助！

Answer 1

这里有一些代码供您检查。您需要修改检索员工列表的位置。我编写静态数据。任何你不清楚的事情，请告诉我。

----------------------- aspx code ------

<asp:GridView ID="grvEmp" runat="server" AutoGenerateColumns="false" 
        onrowdatabound="grvEmp_RowDataBound">
        <Columns>
            <asp:BoundField HeaderText="Employee Id" DataField="ID" />
            <asp:BoundField HeaderText="Name" DataField="Name" />
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:DropDownList ID="dlList" runat="server" AppendDataBoundItems="true">
                        <asp:ListItem Value="" Text=" -- select supervisor --"></asp:ListItem>
                    </asp:DropDownList>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <asp:Button ID="btnUpdate" runat="server" Text="Update" 
        onclick="btnUpdate_Click" />

-----------------代码背后-------------------------- //将此方法放在数据绑定到gridview

的位置

 BindGrid();

private void BindGrid()
        {
            //emp list
            //change here.. load employee list from your database
            dtEmp = new DataTable();
            dtEmp.Columns.Add("ID");
            dtEmp.Columns.Add("Name");
            dtEmp.Columns.Add("SupervisorId");

            DataRow dr = dtEmp.NewRow();
            dr[0] = "1";
            dr[1] = "John";

            dr = dtEmp.NewRow();
            dr[0] = "2";
            dr[1] = "Mary";
            dtEmp.Rows.Add(dr);

            dr = dtEmp.NewRow();
            dr[0] = "3";
            dr[1] = "Edward";
            dtEmp.Rows.Add(dr);

            dr = dtEmp.NewRow();
            dr[0] = "4";
            dr[1] = "Phippip";
            dtEmp.Rows.Add(dr);

            dr = dtEmp.NewRow();
            dr[0] = "5";
            dr[1] = "James";
            dtEmp.Rows.Add(dr);

            dr = dtEmp.NewRow();
            dr[0] = "6";
            dr[1] = "Jason";
            dtEmp.Rows.Add(dr);

            grvEmp.DataSource = dtEmp;
            grvEmp.DataBind();
        }

---------在gridview行数据绑定事件..对于主管下拉列表

protected void grvEmp_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                DropDownList dl = (DropDownList)e.Row.FindControl("dlList");

                if (dl != null)
                {
                    dl.DataSource = dtEmp;
                    dl.DataTextField = "Name";
                    dl.DataValueField = "ID";
                    dl.DataBind();

                    //remove own id
                    dl.Items.Remove(dl.Items.FindByValue(e.Row.Cells[0].Text));
                }

            }
        }

-----------------关于更新按钮点击事件以保存每位员工的主管

protected void btnUpdate_Click(object sender, EventArgs e)
        {
            // get emp id and thier supervisor id

            for (int i = 0; i < grvEmp.Rows.Count; i++)
            {
                GridViewRow row = grvEmp.Rows[i];

                //get emp id 
                string empId = row.Cells[0].Text;

                //get supervisor id
                DropDownList dl = (DropDownList)row.FindControl("dlList");
                string supervisorId = (dl != null) ? dl.SelectedValue : "";

                if (supervisorId != "")
                {
                    //update supervisor id of employee here to DB
                    //you can keep emp n supervisor id pair.. and save all only one time after looping of gridivew
                }
            }
        }

DetailsView中的下拉列表：根据存储的值显示文本

1 个答案: