例外:DrawingSurfaceBackgroundGrid必须是开始绘制的第一个元素.

问题描述

当我打开一个使用DrawingSurfaceBackgroundGrid的XAML页面时，出现了此异常.我该如何解决?

I'm getting this exception when I open a XAML page that uses DrawingSurfaceBackgroundGrid. How do I fix this?

DrawingSurfaceBackgroundGrid必须是开始绘制的第一个元素.

DrawingSurfaceBackgroundGrid must be the first element to begin drawing.

这是我的XAML文件.在MainPage.xaml上，单击MainPage.xaml上的按钮时，我导航到此DirectX.xaml文件.我确保DrawingSurfaceBackgroundGrid是唯一的控件，所以它是FIRST元素.

Here is my XAML file. On my MainPage.xaml, I navigate to this DirectX.xaml file when a button is clicked on MainPage.xaml. I made sure the DrawingSurfaceBackgroundGrid is the only control, so it's the FIRST element.

<phone:PhoneApplicationPage
    x:Class="GameWp8Dx.Hud.Tests.DirectX"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    mc:Ignorable="d"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <DrawingSurfaceBackgroundGrid x:Name="DrawingSurfaceBackground" Loaded="DrawingSurfaceBackground_Loaded">
    </DrawingSurfaceBackgroundGrid>

</phone:PhoneApplicationPage>

MainPage.xaml:

MainPage.xaml:

<phone:PhoneApplicationPage
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
    xmlns:local="clr-namespace:GameWp8Dx"
    xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" xmlns:ec="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions"
    x:Class="GameWp8Dx.MainPage"
    mc:Ignorable="d"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True"
    local:TiltEffect.IsTiltEnabled="True"
    ApplicationBar="{StaticResource socialAppBar}"
    >

    <!--Transitions-->
    <toolkit:TransitionService.NavigationInTransition>
        <toolkit:NavigationInTransition>
            <toolkit:NavigationInTransition.Backward>
                <toolkit:TurnstileTransition Mode="BackwardIn"/>
            </toolkit:NavigationInTransition.Backward>
            <toolkit:NavigationInTransition.Forward>
                <toolkit:TurnstileTransition Mode="ForwardIn"/>
            </toolkit:NavigationInTransition.Forward>
        </toolkit:NavigationInTransition>
    </toolkit:TransitionService.NavigationInTransition>

<!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot">

        <phone:Panorama x:Name="test" HorizontalAlignment="Left" Height="686" VerticalAlignment="Top" Width="470"
    		Title="{Binding Path=LocalizedResources.ApplicationTitle, Source={StaticResource ResourceKey=LocalizedStrings}}" TitleTemplate="{StaticResource MainPageTitleTemplate}" HeaderTemplate="{StaticResource MainPageHeaderTemplate}">


etc.
            

App.xaml

<Application
    x:Class="GameWp8Dx.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone">

    <!--Application Resources-->
    <Application.Resources>

        <ResourceDictionary>
    		<ResourceDictionary.MergedDictionaries>
    			<ResourceDictionary Source="CustomStyles.xaml"/>
    		</ResourceDictionary.MergedDictionaries>

            <local:LocalizedStrings xmlns:local="clr-namespace:GameWp8Dx" x:Key="LocalizedStrings"/>

            <shell:ApplicationBar x:Key="inGameAppBar" IsVisible="True" IsMenuEnabled="False">
    			<shell:ApplicationBarIconButton IconUri="/Assets/Icons/microphone.png" Text="record" Click="record_Click"/>
    			<shell:ApplicationBarIconButton IconUri="/Assets/Icons/questionmark.png" Text="info"/>
    			<shell:ApplicationBarIconButton IconUri="/Assets/Icons/map.png" Text="map" Click="map_Click"/>
    		</shell:ApplicationBar>

    		<shell:ApplicationBar x:Key="socialAppBar" IsVisible="True" IsMenuEnabled="False">
    			<shell:ApplicationBarIconButton IconUri="/Assets/Icons/appbar.twitter.png" Text="Tweet" Click="OnTweet"/>
    			<shell:ApplicationBarIconButton IconUri="/Assets/Icons/appbar.twitter.bird.png" Text="Tweet" Click="OnTweetSharp"/>
    			<shell:ApplicationBarIconButton IconUri="/Assets/Icons/appbar.facebook.png" Text="Share" Click="OnShare"/>
    			<shell:ApplicationBarIconButton IconUri="/Assets/Icons/appbar.facebook.heart.png" Text="Like" Click="OnLike"/>
    		</shell:ApplicationBar>

    	</ResourceDictionary>

    </Application.Resources>

    <Application.ApplicationLifetimeObjects>
        <!--Required object that handles lifetime events for the application-->
        <shell:PhoneApplicationService
            Launching="Application_Launching" Closing="Application_Closing"
            Activated="Application_Activated" Deactivated="Application_Deactivated"/>
    </Application.ApplicationLifetimeObjects>



</Application>

 

 

推荐答案

我还注意到您的游戏页面类名称看起来有点奇怪"GameWp8Dx.Hud.Tests.DirectX" ...
您的游戏页面是否在不同的程序集中?

I also notice your game page class name looks a little odd "GameWp8Dx.Hud.Tests.DirectX"...
Is your game page in a different assembly? 

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