C# 如何从内容页面访问母版页中的用户控件？
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How to access a user control in a masterpage from a content page?
提问by Bryan Denny
Lets say that I have a header user control in a master page, and want to change a property of the user control depending on what content page is loaded inside of the master page. How might I go about this?
假设我在母版页中有一个标题用户控件，并且想要根据在母版页内加载的内容页来更改用户控件的属性。我该怎么办？
Thanks!
谢谢！
采纳答案by Shawn
You can use two methods. The first is by using Page.Master.FindControl('controlID'). Then you can cast it to the type of your user control. The second method is by adding a <%@ MasterType VirtualPath="">OR <%@ MasterType TypeName=""%>tag to your aspx page. In the VirtualPathadd the virtual path to the master page, or the class in the TypeName. You can then access everything with intellisense.
您可以使用两种方法。第一种是通过使用Page.Master.FindControl('controlID'). 然后您可以将其转换为您的用户控件的类型。第二种方法是向aspx 页面添加<%@ MasterType VirtualPath="">OR<%@ MasterType TypeName=""%>标记。在VirtualPath母版页中添加虚拟路径，或TypeName. 然后，您可以使用智能感知访问所有内容。
回答by Robert C. Barth
There's one other method, and that's by making a public property on the master page that exposes the user control.
还有另一种方法，那就是在母版页上创建一个公开用户控件的公共属性。
回答by Mark Carpenter
Using a public property would work. In the content page's FormLoad method, you could do something like this (VB):
使用公共财产会起作用。在内容页面的 FormLoad 方法中，您可以执行以下操作 (VB)：
Dim myMaster as MyMasterPage = CType(Page.Master, MyMasterPage)
myMaster.MyUserControl.Text = "Hello!"
回答by jyothi
first find the user control in the masterpage as below.Then find the control you need to access their property.
首先在母版页中找到用户控件，如下所示。然后找到您需要访问其属性的控件。
UserControl uch = Page.Master.FindControl("ucHeader1") as UserControl;
PlaceHolder phProxylist= ucHeader1.FindControl("phProxy") as PlaceHolder;
DropDownList ddlproxylist1 = ucHeader1.FindControl("ddlProxyList") as DropDownList;
phProxylist.Visible = false;
Hope this helps.
希望这可以帮助。
