将值从用户控件传递到后面的代码

Question

I'm trying to pass a value from a User Control to a code behind without luck. I can write the correct value (IDuser_uc) on the aspx page but I can't pass it to the code behind. Any tips?

User Control

protected void FormView_IDuser_DataBound(object sender, EventArgs e)
    {
            Label IDuserText = FormView_IDuser.FindControl("IDuserLabel") as Label;
            IDuser_uc = Convert.ToString(IDuserText.Text);

    }

ASPX page

<uc4:IDuser id="IDuser" runat="server" />
<% Response.Write(IDuser.IDuser_uc); // Here correct value %>

Code Behind

protected void Page_Load(object sender, EventArgs e)
    {
     SqlDataSource_userConnections.SelectParameters["IDuser_par"].DefaultValue = IDuser.IDuser_uc ; // Here NO value
     Response.Write("Connections :" + IDuser.IDuser_uc); // Here NO value

    }

UPDATE

The problem was due to the fact that the User Control is run after the PageLoad which explains why I got an empty string. To solve the problem I used Page_PreRender instead of Page_Load on the code behind page.

Answer 1

Create a public method in your user control. When you post back the page have the Parent.aspx page call the user control method. Example....

1. In your User Control:

   Public string GetUserControlValue() { return Label IDuserText;

   }

2. In your Parent ASPX Pgae

   var UserControlString = IDuser_uc.GetUserControlValue();