【问题标题】：How to access value in one Ascx control in another Ascx control on the same page如何在同一页面上的另一个 Ascx 控件中访问一个 Ascx 控件中的值
【发布时间】：2016-08-26 07:06:15
【问题描述】：

我有一个 aspx 页面，其中有两个用户控件，其中一个带有网格视图，另一个带有标签，用于在用户登录时显示用户数据。现在我想使用在第二个用户控件的标签中显示的网格视图。我怎样才能做到这一点。根据每个用户的安全角色，gridview 中的数据会发生变化。任何输入表示赞赏。谢谢

【问题讨论】：

标签： asp.net vb.net gridview user-controls

【解决方案1】：

Gridview 用户控件在获得所需信息时会引发自定义事件。该事件在主页中进行处理，并通过一个公共属性分配给带有标签的 UserControl，该公共属性可以访问控件中嵌入的标签文本。

默认.aspx

包含两个用户控件的页面

<%@ Page Title="Home Page" Language="VB" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.vb" Inherits="StackOverFlowJunkVB._Default" %>
<%@ Register Src="~/WebUserControlGridView1.ascx" TagPrefix="uc1" TagName="WebUserControlGridView1" %>
<%@ Register Src="~/WebUserControlLabel1.ascx" TagPrefix="uc1" TagName="WebUserControlLabel1" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
    <uc1:WebUserControlGridView1 runat="server" id="WebUserControlGridView1" />
    <uc1:WebUserControlLabel1 runat="server" id="WebUserControlLabel1" />
</asp:Content>

Default.aspx.vb

通过 GridView 用户控件引发的事件将文本分配给 Label 用户控件的代码

Public Class _Default
    Inherits Page

    Private Sub WebUserControlGridView1_ReallyImportantLabelTextHandler(sender As Object, e As GridViewLabelEvent) _
      Handles WebUserControlGridView1.ReallyImportantLabelTextHandler

        WebUserControlLabel1.ReallyImportLabelText = e.ImportantLabelText

    End Sub
End Class

GridView 用户控件的代码隐藏

' Define a custom EventArgs class to pass some really important text
Public Class GridViewLabelEvent
    Inherits EventArgs

    Public Property ImportantLabelText As String
End Class

' The user control with a GridView
Public Class WebUserControlGridView1
    Inherits System.Web.UI.UserControl

  Public Event ReallyImportantLabelTextHandler As EventHandler(Of GridViewLabelEvent)

  Private Sub GridView1_DataBound(sender As Object, e As EventArgs) Handles GridView1.DataBound
    Dim gvle As New GridViewLabelEvent
    gvle.ImportantLabelText = "This is really important"
    RaiseEvent ReallyImportantLabelTextHandler(Me, gvle)
  End Sub
End Class

标签用户控件的代码隐藏

Public Class WebUserControlLabel1
    Inherits System.Web.UI.UserControl

    ' Property to assign Label Text
    Public Property ReallyImportLabelText As String
        Get
            Return Label1.Text
        End Get
        Set(value As String)
            Label1.Text = value
        End Set
    End Property
End Class

【讨论】：