在asp.net 2用户控件之间传递数据 [英] Passing Data between two usercontrols in asp.net

问题描述

我有一个UC_Categories.ascx （UC_1）哪些约束类别名称。 UC_Products.ascx （UC_2）将表明产品的类别名称。他们两人都是在网页称为BookShop.aspx（页）

i have a UC_Categories.ascx ( UC_1 ) which constraints categoryname . UC_Products.ascx ( UC_2 ) will show products by categoryname. Both of them are in a Page called BookShop.aspx ( Page )

在页面，当用户单击 UC_1 （步骤1），它将呈现一个 UC_2 按类别名称（步骤2）。我处理由发送带有参数的要求就是要类别名称的页第1步。第二步：创建一个新的 UC_2 后，设置的属性值，类别名称，并执行FillProductByCategoryName方法。然后加入 UC_2 ，即可在页面的占位符。但我不显示的 UC_2 。

In the Page, when user click a UC_1 (step 1 ) , it will render a UC_2 by categoryname (step2 ). I process step 1 by sending a request with param that is categoryname to Page. Step2 create a new UC_2 ,set Properties value that is categoryname , and execute FillProductByCategoryName method. then add UC_2 to a PlaceHolder in the Page. but i don't show UC_2 .

我需要帮助或建议大家

感谢您阅读我的问题！
PS：我的英语不是很好。

Thank you for reading my question! ps : my english isn't very well.

在UC2的codebehind：

in the codebehind of the UC2 :

public void FillProduct()
    {

        ProductsMN productsMN = new ProductsMN();
        if (dlBook == null)
        {
            dlBook = new DataList();
            dlBook.DataSource = productsMN.GetByCategoryName(CategoryName);
            dlBook.DataBind();
        }
        else
        {
            dlBook.DataSource = productsMN.GetByCategoryName(CategoryName);
            dlBook.DataBind();
        }
    }

    public string CategoryName { get; set; }

在页面codebehind

in the codebehind of the page

 protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
        }
        string categoryName = Request.QueryString["categoryName"] as string;
        if (!string.IsNullOrWhiteSpace(categoryName))
        {
            BookContent.Controls.Clear(); // BookContent : Placeholder
            Control c = Page.LoadControl("~/UC/UC_Books.ascx") as UC.UC_Books;
            UC.UC_Books ucBook = new UC.UC_Books();
            ucBook.CategoryName = categoryName;
            ucBook.FillProduct(); //line 10
            BookContent.Controls.Add(ucBook); //line 11
        }

    }

在页面的pageLoad的，useBook包含数据。但在页面（视图），我没有看到数据。我认为// line11不执行或不正确的。

at the PageLoad of the Page, useBook contains data. but in the Page (view ), i don't see data. i think //line11 isn't execute or not true .

推荐答案

您需要公开的公共属性和用户控件的控件的父页面的构造函数。

You need to expose public properties and a constructor of the UserControl's Controls to the parent page.

假设你的用户控件得到了一个标签：

Say your Usercontrol has got a label:

<asp:Label ID="MyLabel" runat="server" visible="true"/>

在用户控件的codebehind添加此。

In the codebehind of the UserControl add this.

    //Constructor
    public MyUserControl()
    {
        Category = new Label();
    }
    //Exposing the Label
    public Label Category
    {
        get { return this.MyLabel; }
        set { this.MyLabel = value; }
    }

假设你已经添加了用户控件到父页面，它的ID是的MyUserControl。

Assume you have added the UserControl to the parent page and its ID is "MyUserControl".

要在用户控件的标签值设置为使用的东西这样的：

To set the label value of the UserControl to something use this:

MyUserControl.Category.Text=Response.QueryString["categoryname"];//Obviously you would want to encode it first.

如果您需要调用在该用户的codebehind父页面的功能，你将不得不使用委托。我不会推荐，虽然这个方法。

If you need to call functions of the parent page in the UserControl's codebehind, you will have to use delegates. I would not recommend this method though.

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