ASP.Net我的更新值从下拉列表不更新/显示 [英] ASP.Net My Updated Value From Drop Down List Doesn't Update/Display

问题描述

我这是在会话存储数据的4页ASP.NET表单。我的第3页上的按钮清除会话。所有这一切工作正常，但我有更新，因为它保留了我的确认页值的问题/显示我最初选择的值，我不能找出原因。

I have a 4 page ASP.NET form which is storing data in the session. A button on my 3rd page clears the session. All this is working fine but I'm having a problem updating a value on my confirmation page as it retains/displays my initial selected value and i cant figure out why.

第一页HTML随着DropDownList的

<asp:DropDownList ID="ddlInnoc" runat="server" class="form-control">
     <asp:ListItem Value="0">- - Please Select - -</asp:ListItem>
     <asp:ListItem Value="Male">Male</asp:ListItem>
     <asp:ListItem Value="Female">Female</asp:ListItem>
</asp:DropDownList>

第一页code这将重新显示选定值的背后

protected void Page_Load(object sender, EventArgs e)
    {
        txtData1.Focus();

        if (txtData1.Text == string.Empty && Session["pg1input"] != null)
        {
            txtData1.Text = Session["pg1input"].ToString();
        }

        if (Session["pg1dd"] != null)
        {
            ddlInnoc.SelectedValue = Session["pg1dd"].ToString();
        }

        //if (Session["pg1dd"].ToString() == "")
        //{
        //    ddlInnoc.SelectedValue = Session["pg1dd"].ToString();
        //}
    }

    protected void pg1button_Click(object sender, EventArgs e)
    {
        Session["pg1input"] = txtData1.Text;
        Session["pg1dd"] = ddlInnoc.SelectedItem;
        Response.Redirect("/Session/pg2.aspx");
    }

第3页HTML code

            <div class="form-group">
                <div class="col-xs-12">
                    <asp:Label ID="Label1" class="col-md-2 control-label" runat="server" Text="Name:"></asp:Label>
                    <div class="col-md-3 form-control-static">
                        <%=Session["pg1input"] %>
                    </div>
                </div>
            </div>
            <div class="form-group">
                <div class="col-xs-12">
                    <asp:Label ID="Label2" class="col-md-2 control-label" runat="server" Text="Sex:"></asp:Label>
                    <div class="col-md-3 form-control-static">
                        <%=Session["pg1dd"] %>
                    </div>
                </div>
            </div>
<div class="row">
     <div class="col-sm-offset-4 col-xs-12">
          <asp:LinkButton ID="pg1EditButton" runat="server" OnClick="pg1EditButton_Click" CssClass="btn btn-default">
               <span aria-hidden="true" class="glyphicon glyphicon-pencil"></span> Edit
          </asp:LinkButton>
     </div>
</div>

第3页编辑按钮code背后

protected void pg1EditButton_Click(object sender, EventArgs e)
{
    Response.Redirect("/Session/pg1.aspx");
}

我怀疑它的东西与我的背后第1页的所有其他领域/单选按钮在其他页面检索和显示我的第三页上的更新值在code做的。

I suspect that its something to do with the code behind on my page 1 as all the other fields/radio buttons on the other pages retrieves and displays the updated value on my 3rd page.

推荐答案

修正为

if (!IsPostBack)
{
     if (ddlInnoc.SelectedValue != "0" && Session["pg1dd"] != null)
     {
          ddlInnoc.SelectedValue = Session["pg1dd"].ToString();
     }
}

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