更改启动页面 [英] Changing the StartUp Page

问题描述

我目前正在我的应用程序中创建一个设置页面，让用户可以选择主页面的UI。我有两个页面，每个页面包含一个不同的UI。它们是"MainPage.xaml"。和"OldMainPage.xaml"。我想知道如何在Visual Basic中编写
来改变启动页面，具体取决于"MainPage"的radiobutton是否可用。或"OldMainPage"的"radiobutton"或"radiobutton"在设置页面中是否选中。

Hi, I am currently making a settings page in my app which lets the user pick the main page's UI. I have two pages one of each contain a different UI. They are "MainPage.xaml" and the "OldMainPage.xaml". I was wondering how I can program in Visual Basic to change the startup page depending on if the radiobutton for "MainPage" or radiobutton for "OldMainPage" in the settings page is checked or not.

我已经找到了如何实现这一目标的方法，但是它们似乎都没有效果。我尝试了UriMapper，这是我在App.xaml.vb页面中到目前为止的代码片段：

I have looked up ways on how to achieve this, however none of them seem to work. I tried UriMapper and here is the snippet of code I have thus far in my App.xaml.vb page:

   公共类UriMapper

       继承UriMapperBase

       私人天使作为字符串

        Public Overrides Function MapUri（uri As Uri）As Uri

            Dim tempUri = uri.ToString（）

           如果（tempUri.Contains（QUOT; ViewfinderLaunch"））然后

              &NBSP ; Dim referenceSettings As New Settings

               如果referenceSettings.radioButton7.IsChecked然后

                 &NBSP ; 返回新的URI（QUOT; /MainPage.xaml" ;, UriKind.Relative）

                 elseif的referenceSettings.radioButton8.IsChecked然后

                 &NBSP ; 返回新的URI（QUOT; /OldMainPage.xaml" ;, UriKind.Relative）

                结束如果

           结束如果

           返回uri

       结束功能

   结束类

    Public Class UriMapper
        Inherits UriMapperBase
        Private tempuri As String
        Public Overrides Function MapUri(uri As Uri) As Uri
            Dim tempUri = uri.ToString()
            If (tempUri.Contains("ViewfinderLaunch")) Then
                Dim referenceSettings As New Settings
                If referenceSettings.radioButton7.IsChecked Then
                    Return New Uri("/MainPage.xaml", UriKind.Relative)
                ElseIf referenceSettings.radioButton8.IsChecked Then
                    Return New Uri("/OldMainPage.xaml", UriKind.Relative)
                End If
            End If
            Return uri
        End Function
    End Class

稍后，我将其置于"Private Sub InitializePhoneApplication（）"下：

And later on, I have put this under"Private Sub InitializePhoneApplication()":

  RootFrame.UriMapper = New UriMapper（）

 RootFrame.UriMapper = New UriMapper()

我不确定我做错了什么，所以任何帮助都会受到极大关注。谢谢！

I am not sure if I am doing anything wrong, so any help would be greatly appriciated. Thank you!

推荐答案

您好，可以使用以下代码片段：

Hi there, you can use the following code snippet:

var tipo = (from assembly in AppDomain.CurrentDomain.GetAssemblies()
    from type in assembly.GetTypes()
    where type.Name.ToLower() == "YOUR_MAIN_PAGE_NAME".ToLower()
    select type).FirstOrDefault();

if (tipo != null)
{
    //test contains your XAML file
    object test = Activator.CreateInstance(tipo);
    //Do some stuff here...
}    

我的解决方案是C＃，但想法是一样的。

My solution is in C# but the idea is the same.

希望有所帮助。

这篇关于更改启动页面的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！