如何动态加载web用户控件

本文关键字：加载 web 用户 控件 动态 何动态 | 更新日期: 2023-09-27 18:23:49

这是一个非常重要的问题。这让我在4个小时内疯了：（我可以加载UCAddX.ascx，但如果我点击"在X中搜索"按钮，就不会加载UCSearchX用户控件。有3个按钮也有3个网络用户控件。我想在点击事件后加载这3个网络用户控件。但下面的方法不起作用。如何动态加载网络用户控件？点击（像选项卡控件一样）

 public partial class MyPage: System.Web.UI.Page
    {
   protected void Page_Load(object sender, EventArgs e)
        {
            ViewState["controlType"] = "AddX";
            if (!IsPostBack)
            {
                AddUserControl();
            }
            else
            {
                AddUserControl();
            }
        }
        protected void btnAddX_Click(object sender, DirectEventArgs e)
        {
            ViewState["controlType"] = "AddX";
            if (!IsPostBack)
                  AddUserControl();
            else
                AddUserControl();
        }
        protected void btnSearchX_Click(object sender, DirectEventArgs e)
        {
            ViewState["controlType"] = "SearchX";
            if (!IsPostBack)
                AddUserControl();
            else
                AddUserControl();
        }
        protected void btnUpdateX_Click(object sender, DirectEventArgs e)
        {
        }
        void AddUserControl()
        {
          //  plhContent1.Controls.Clear();
            if (ViewState["controlType"] != null)
            {
                if (ViewState["controlType"].ToString() == "AddX")
                {
                    UCAddX uc = (UCAddX)Page.LoadControl("~/Pages/EN/MyUserControls/UCAddX.ascx");
                    uc.ID = "ucAddX";
                    uc.Attributes.Add("runat", "Server");
                    uc.EnableViewState = true;
                    uc.Visible = true;
                    plhContent1.Controls.Add(uc);
                }
                else if (ViewState["controlType"].ToString() == "SearchX")
                {
                    UCSearchX uc = (UCSearchX)Page.LoadControl("~/Pages/EN/MyUserControls/UCSearchX.ascx");
                    uc.ID = "ucSearchX";
                    uc.Attributes.Add("runat", "Server");
                    uc.EnableViewState = true;
                    uc.Visible = true;
                    plhContent1.Controls.Add(uc);
                }

            }
        }
    }

如何动态加载web用户控件

使用下面的代码动态加载用户控件

var control = LoadControl(filePath) as ControlType;

然后您可以订阅事件并添加到控件占位符。

希望这能帮助

试试这样的东西，

//to load the control
     protected void Page_Init(object sender, EventArgs e)
     {
         ViewState["controlType"] = "AddSector";
         //you don't need to check the if condiontion, cause you load every time the controls
         AddUserControl();
      }

当你需要在回发后从控件中获取值时，你应该在上获取它

protected void Page_PreRender(object sender, EventsArgs args) {
    //your placeholder that contains data
}

动态加载的用户控件需要在每个Page_Load上加载，以便保持其视图状态。所以你需要这样的东西：

    public string CurrentControlToLoad
    {
        get
        {
             if(ViewState["controlType"] == null)
                 return "";
             return (string)ViewState["controlType"];
        }
        set
        {
             ViewState["controlType"] = value;
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if(CurrentControlToLoad != "")
           LoadControl(CurrentControlToLoad);
    }
    protected void btnAddSector_Click(object sender, DirectEventArgs e)
    {
        CurrentControlToLoad = "AddSector";
        LoadControl(CurrentControlToLoad);
    }
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