c# - 在按钮单击、回发问题上动态加载用户控件

Question

我试图在单击按钮时加载用户控件，但问题是，它在用户控件内的回发时消失了。

这是我加载控件的方式:

private bool IsUserControl
{
    get
    {
        if (ViewState["IsUserControl"] != null)
        {
            return (bool)ViewState["IsUserControl"];
        }
        else
        {
            return false;
        }
    }
    set
    {
        ViewState["IsUserControl"] = value;
    }
}


#region Usercontrols
private void CreateUserControlAllNews()
{
    Control featuredProduct = Page.LoadControl("path/usercontrol.ascx");
    plh1.Controls.Add(featuredProduct);
}

#endregion
protected void allNewsbtn_Click(object sender, EventArgs e)
{

    this.IsUserControl = true;
    if(IsUserControl)
    CreateUserControlAllNews();
}

Answer 1

您需要在回发页面时重新加载控件。例如，

protected void Page_Load(object sender, EventArgs e)
{
    if (IsUserControl)
    {
        CreateUserControlAllNews();        
    }
}

private void CreateUserControlAllNews()
{
    Control featuredProduct = Page.LoadControl("path/usercontrol.ascx");
    featuredProduct.ID = "1234";
    plh1.Controls.Add(featuredProduct);
}