项目下拉列表的SelectedValue不是我选择的 [英] SelectedValue of item Dropdownlist not what I selected

问题描述

单击链接按钮后，我的下拉列表的SelectedValue的默认值为2。无论我在下拉列表中选择什么，它仍然给我相同的价值。我做错了什么？



titleid 总是最终 2 ，第一个选项的价值下拉列表..



ASPX

I keep getting a default value of 2 for the SelectedValue of my dropdownlist upon clicking the link button. Whatever I choose in the dropdownlist it still gives me the same value. What am I doing wrong?

titleid always ends up being 2, the value of the first option of dropdownlist..

ASPX

<asp:GridView runat="server" ID="TitleView" OnRowDataBound="TitleView_RowDataBound" OnRowCommand="TitleView_OnRowCommand" AutoGenerateColumns="False">
                    <AlternatingRowStyle CssClass="even"></AlternatingRowStyle>
                    <Columns>
                        <asp:BoundField DataField="Fullname" HeaderText="Fullname" />
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:HiddenField ID="UserID" Value='<%# DataBinder.Eval(Container.DataItem, "UserID") %>' runat="server" />
                                <div class="input-append"><asp:DropDownList CssClass="span5" ID="TitleList" runat="server" />
                                    <asp:LinkButton ID="lbnView" runat="server" Text="Update" CssClass="btn btn-primary" CommandName="ChangeCopyStatus"></asp:LinkButton></div>
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>

Codebehind

Codebehind

protected void Page_Load(object sender, EventArgs e)
        {
            bindTitleView();
        }

        public void bindTitleView()
        {
            //took out to save space
        }
        protected void TitleView_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                DropDownList ddl = (DropDownList)e.Row.FindControl("TitleList");
                using (SqlConnection conn = new SqlConnection(""))
                {
                    SqlCommand cmd = new SqlCommand(@"SELECT ID, Name FROM EmployeeTitles ORDER BY Name ASC", conn);
                    conn.Open();
                    SqlDataAdapter adp = new SqlDataAdapter(cmd);
                    DataTable myDataSet = new DataTable();
                    adp.Fill(myDataSet);
                    ddl.DataSource = myDataSet;
                    ddl.DataTextField = "Name";
                    ddl.DataValueField = "ID";
                    ddl.DataBind();
                }
            }
        }
        protected void TitleView_OnRowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName.Equals("ChangeCopyStatus"))
            {
                GridViewRow currentrow = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
                DropDownList ddlCopyStatus = (DropDownList)currentrow.FindControl("TitleList") as DropDownList;
                HiddenField hfUserID = (HiddenField)currentrow.FindControl("UserID") as HiddenField;

                int titleid = Convert.ToInt32(ddlCopyStatus.SelectedValue);
                int userid = Convert.ToInt32(hfUserID.Value);

                using (SqlConnection conn = new SqlConnection(""))
                {
                    SqlCommand cmd = new SqlCommand(@"UPDATE [User] set Title2=@f1 where [UserID] = '" + userid + "'", conn);
                    conn.Open();
                    cmd.Parameters.Add("@f1", SqlDbType.Int).Value = titleid;
                    cmd.ExecuteNonQuery();
                }
                Response.Redirect("Title.aspx");
            }
        }

推荐答案

确保在Page_Load事件中测试！IsPostBack并且只进行数据绑定当它是页面的初始加载时。

Make sure to test for !IsPostBack in the Page_Load event and only do your databinding when it is the initial load of the page.

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