如何将项目从下拉列表发送到另一页上的文本框。 [英] How Do I Send A Item From A Drop Down List To A Textbox On Another Page.

问题描述

我从这些控件发送值：

im sending values from these controls :

protected void btnSearch_Click(object sender, EventArgs e)
        {
            Session["Departure"] = ddDeparture;
            Session["Arrival"] = ddArrival;
            Session["DepartureCalendar"] = btnShowCalendar1.Text;
            Session["ArrivalCalendar"] = btnShowCalendar2.Text;
            Response.Redirect("Search.aspx");
        }

到这些：

to these:

protected void Button1_Click(object sender, EventArgs e)
        {
            txtDeparture.Text = (DropDownList)Session["Departure"];
            txtArrival.Text = (DropDownList)Session["Arrival"];
            txtDateOfDeparture.Text = (string)Session["DepartureCalendar"];
            txtDateOfArrival.Text = (string)Session["ArrivalCalendar"];  
        }

但我收到此错误：

无法转换类型为'System'的对象.Web.UI.WebControls.DropDownList'键入'System.String'。



我需要尽快帮助你。谢谢

but i get this error:
Unable to cast object of type 'System.Web.UI.WebControls.DropDownList' to type 'System.String'.

I NEED YOUR HELP ASAP. THANKS

推荐答案

您将整个下拉列表分配给下面提到的代码中的文本框

you are assigning whole dropdown list to text box in below mention code

txtDeparture.Text = (DropDownList)Session["Departure"];

像这样更改你的代码

Change your code like this

protected void btnSearch_Click(object sender, EventArgs e)
        {
            Session["Departure"] = ddDeparture.SelectedItem.Text;
            Session["Arrival"] = ddArrival.SelectedItem.Text;
             Session["DepartureCalendar"] = btnShowCalendar1.Text;
            Session["ArrivalCalendar"] = btnShowCalendar2.Text;
            Response.Redirect("Search.aspx");
        }

和

and

protected void Button1_Click(object sender, EventArgs e)
        {
            txtDeparture.Text = Convert.ToString(Session["Departure"]);
            txtArrival.Text = Convert.ToString(Session["Arrival"]);
            txtDateOfDeparture.Text = (string)Session["DepartureCalendar"];
            txtDateOfArrival.Text = (string)Session["ArrivalCalendar"];
        }

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