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[英]System.ArgumentException: 'Value does not fall within the expected range.'
[英]System.ArgumentException: 'Value does not fall within the expected range.' on Content Dialog
我正在嘗試在我的 UWP (WinUI3) 應用程序中創建一個登錄系統,當我嘗試啟動 de Login Content Dialog 時,它崩潰並拋出此錯誤:
System.ArgumentException:“值不在預期范圍內。”
在await messageDialog.ShowAsync();
app.xaml.cs 上的代碼:
protected override async void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
{
m_window = new MainWindow();
m_window.Activate();
Login();
}
protected async void Login()
{
var messageDialog = new ContentDialogs.LoginDialog();
await messageDialog.ShowAsync();
if (App.Aplicacao.Utilizador == null)
{
m_window.Close();
return;
}
}
內容對話 XAML:
<ContentDialog
x:Class="xizSoft.ContentDialogs.LoginDialog"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:xizSoft.ContentDialogs"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="{ThemeResource SystemControlAcrylicWindowBrush}">
<Grid>
</Grid>
</ContentDialog>
代碼隱藏:
public LoginDialog()
{
this.InitializeComponent();
}
等待 window 的內容加載完畢,然后設置ContentDialog
的XamlRoot
屬性。
這是在啟動時顯示對話框的方式:
protected override async void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
{
m_window = new MainWindow();
m_window.Activate();
if (m_window.Content is FrameworkElement fe)
fe.Loaded += (ss, ee) => Login();
}
protected void Login()
{
var messageDialog = new ContentDialogs.LoginDialog();
messageDialog.XamlRoot = m_window.Content.XamlRoot;
await messageDialog.ShowAsync();
if (App.Aplicacao.Utilizador == null)
{
m_window.Close();
return;
}
}
private Window m_window;
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