向中继器中的用户控件添加事件处理程序

本文关键字：添加 事件处理 程序 控件 用户 中继器 | 更新日期: 2023-09-27 18:07:30

我有一个asp.net web应用程序。我已经创建了一个用户控件。用户控件有一个事件处理程序，父页(。Aspx文件)可以调用。该.aspx页面使用一个重复器来生成几个用户控件。如果我将单个用户控件放在中继器之外，并在Page_Load中添加事件处理程序，它将按照我想要的方式工作。如果我尝试在中继器中创建的控件，则不调用我的事件。我将尽可能多地删减代码，以创建一个稍微简单的代码示例。

部分用户控制。asx .cs文件:

    public event EventHandler UserControlUploadButtonClicked;
    private void OnUserControlUploadButtonClick()
    {
        if (UserControlUploadButtonClicked != null)
        {
           //Makes it to this line if control is created outside repeater
           //controls created in repeater are null so this line not executed
           UserControlUploadButtonClicked(this, EventArgs.Empty);
        }
    }
    protected void TheButton_Click(object sender, EventArgs e)
    {
        // .... do stuff then fire off the event
        OnUserControlUploadButtonClick();
    }

重要的用户控件的标记:

<asp:ImageButton runat="server"  ID="imbUploadFile" ImageUrl="~/images/status_red.png" ToolTip="Upload File" onclick="TheButton_Click"  />

这里是。aspx.cs部分，如果我在Page_Load上调用它:

    protected void Page_Load(object sender, EventArgs e)        
    {
        if (!IsPostBack)
        {
            LoadDDLs();''Load drop down lists for filter for other UI stuff
        }
        ''This works!
        this.ucTest.UserControlUploadButtonClicked += new EventHandler(ManageUploader);
     }

这就是我正在尝试的不工作的中继器的绑定:

    protected void rptMonthlyFiles_ItemDataBound(Object Sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            DataRowView drv = e.Item.DataItem as DataRowView;
            //there are one of these for each month cut the rest out to make smaller code sample
            //Below gets DB info and sets up user control properly for UI based on business rules
            ((NRTWebApplication.UserControls.ucMonthlyFile2)e.Item.FindControl("ucOctMonthlyFile")).GetFileInfo();
            // This is how I am adding the event handler for each user control and it does not work like if done in Page_Load
            ((NRTWebApplication.UserControls.ucMonthlyFile2)e.Item.FindControl("ucOctMonthlyFile")).UserControlUploadButtonClicked += new EventHandler(ManageUploader);
        }
    }

这是一个占位符，表示当通过单击用户控件引发事件时，父页.aspx应该做什么:

    private void ManageUploader(object sender, EventArgs e)
    {
        // ... do something when event is fired
        this.labTest.Text = "After User Control Button Clicked";
    }

坚持了一段时间，任何和所有的帮助，非常感谢!

向中继器中的用户控件添加事件处理程序

看一下这个(https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.repeater_events(v=vs.110).aspx)，以了解中继器的事件生命周期。基本上，您需要在创建repeater项时连接Web User Control的事件，而不是在绑定时，后者显然发生在创建之后。下面的代码应该可以为您工作:

protected void rptMonthlyFiles_ItemCreated(Object Sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        DataRowView drv = e.Item.DataItem as DataRowView;
        //there are one of these for each month cut the rest out to make smaller code sample
        //Below gets DB info and sets up user control properly for UI based on business rules
        ((NRTWebApplication.UserControls.ucMonthlyFile2)e.Item.FindControl("ucOctMonthlyFile")).GetFileInfo();
        // This is how I am adding the event handler for each user control and it does not work like if done in Page_Load
        ((NRTWebApplication.UserControls.ucMonthlyFile2)e.Item.FindControl("ucOctMonthlyFile")).UserControlUploadButtonClicked += new EventHandler(ManageUploader);
    }
}
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