在图像上获取圆角

Question

Prescott Chartier

Asked: 2025-03-07 03:36:58 +0800 CST2025-03-07 03:36:58 +0800 CST 2025-03-07 03:36:58 +0800 CST

Maui App 连接到 Visual Studio 时以调试模式运行，但独立运行时崩溃

772

我已将问题缩小到Flyout菜单 xaml 代码中的某个部分，但无法查明原因。我的 xaml：

        <VerticalStackLayout
            x:Name="Flyout"
            WidthRequest="260"
            HorizontalOptions="Start"
            Spacing="2"
            Grid.Row="1"
            BackgroundColor="Gold"
            TranslationX="-250">
            <HorizontalStackLayout HorizontalOptions="Start" HeightRequest="50" >
                <Image Source="addEmployee.jpg" Style="{StaticResource IconLabelStyle}" />
                <Label x:Name="AddEmployee" Text="Add Employee" Style="{StaticResource LabelStyle}" />
                <HorizontalStackLayout.GestureRecognizers>
                    <TapGestureRecognizer Tapped="OnMenuItemTap" CommandParameter="Add Another Participant"/>
                </HorizontalStackLayout.GestureRecognizers>
            </HorizontalStackLayout>
            <HorizontalStackLayout HorizontalOptions="Start" HeightRequest="50">
                <Image Source="assign.jpg" Style="{StaticResource IconLabelStyle}" />
                <Label x:Name="Assign" Text="Assign Employee To Section" Style="{StaticResource LabelStyle}" />
                <HorizontalStackLayout.GestureRecognizers>
                    <TapGestureRecognizer Tapped="OnMenuItemTap" CommandParameter="Re-Register"/>
                </HorizontalStackLayout.GestureRecognizers>
            </HorizontalStackLayout>
            <HorizontalStackLayout HorizontalOptions="Start" HeightRequest="50">
                <Image Source="text.jpg" Style="{StaticResource IconLabelStyle}" />
                <Label x:Name="sendtext" Text="Send Text" Style="{StaticResource LabelStyle}" />
                <HorizontalStackLayout.GestureRecognizers>
                    <TapGestureRecognizer Tapped="OnMenuItemTap" CommandParameter="ChatRoom"/>
                </HorizontalStackLayout.GestureRecognizers>
            </HorizontalStackLayout>
            <HorizontalStackLayout HorizontalOptions="Start" HeightRequest="50">
                <Image Source="myaccount.jpg" Style="{StaticResource IconLabelStyle}" />
                <Label x:Name="MyAccount" Text="My Account" Style="{StaticResource LabelStyle}" />
                <HorizontalStackLayout.GestureRecognizers>
                    <TapGestureRecognizer Tapped="OnMenuItemTap" CommandParameter="My Account"/>
                </HorizontalStackLayout.GestureRecognizers>
            </HorizontalStackLayout>
            <HorizontalStackLayout HorizontalOptions="Start" HeightRequest="50">
                <Image Source="myaccount.jpg" Style="{StaticResource IconLabelStyle}" />
                <Label x:Name="LogOut" Text="Log Off" Style="{StaticResource LabelStyle}" />
                <HorizontalStackLayout.GestureRecognizers>
                    <TapGestureRecognizer Tapped="OnMenuItemTap" CommandParameter="Log Off"/>
                </HorizontalStackLayout.GestureRecognizers>
            </HorizontalStackLayout>
        </VerticalStackLayout>

当我注释掉Flyout代码时，应用程序将在调试器之外运行。我转储了测试设备崩溃日志，在其中发现了以下内容：

03-05 20:52:00.570 10573  4825  4825 I MonoDroid: UNHANDLED EXCEPTION:
03-05 20:52:00.575 10573  4825  4825 I MonoDroid: Android.Runtime.JavaProxyThrowable: Exception of type 'Android.Runtime.JavaProxyThrowable' was thrown.
03-05 20:52:00.575 10573  4825  4825 I MonoDroid: 
03-05 20:52:00.575 10573  4825  4825 I MonoDroid:   --- End of managed Android.Runtime.JavaProxyThrowable stack trace ---
03-05 20:52:00.575 10573  4825  4825 I MonoDroid: android.runtime.JavaProxyThrowable: [System.InvalidCastException]: Specified cast is not valid.
03-05 20:52:00.575 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.ApplyPropertiesVisitor.SetPropertyValue + 0xb9(Unknown Source)
03-05 20:52:00.575 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.ApplyPropertiesVisitor.Visit + 0xf6(Unknown Source)
03-05 20:52:00.575 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.ElementNode.Accept + 0x90(Unknown Source)
03-05 20:52:00.575 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.ElementNode.Accept + 0x3e(Unknown Source)
03-05 20:52:00.575 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.ElementNode.Accept + 0x67(Unknown Source)
03-05 20:52:00.575 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.ElementNode.Accept + 0x67(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.ElementNode.Accept + 0x67(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.ElementNode.Accept + 0x67(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.RootNode.Accept + 0x81(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.XamlLoader.Visit + 0x97(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.XamlLoader.Load + 0x9d(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.XamlLoader.Load + 0x0(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.XamlLoader.Load + 0x29(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Microsoft.Maui.Controls.Xaml.Extensions.LoadFromXaml + 0x0(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at MyApp.RegUser.InitializeComponent + 0x1(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at MyApp.RegUser..ctor + 0xa0(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at MyApp.Logon+<SignOn>d__6.MoveNext + 0x7b6(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw + 0x11(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess + 0x37(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification + 0x2d(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd + 0x8(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.CompilerServices.TaskAwaiter.GetResult + 0x0(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at MyApp.Logon+<<OnCounterClicked>b__5_0>d.MoveNext + 0x73(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw + 0x11(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess + 0x37(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification + 0x2d(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd + 0x8(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.CompilerServices.TaskAwaiter.GetResult + 0x0(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at MyApp.Logon+<OnCounterClicked>d__5.MoveNext + 0xf4(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw + 0x11(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at System.Threading.Tasks.Task+<>c.<ThrowAsync>b__128_0 + 0x0(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0 + 0x0(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Java.Lang.Thread+RunnableImplementor.Run + 0x8(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Java.Lang.IRunnableInvoker.n_Run + 0x0(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PP_V + 0x5(Unknown Source)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at mono.java.lang.RunnableImplementor.n_run(Native Method)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:29)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at android.os.Handler.handleCallback(Handler.java:958)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at android.os.Handler.dispatchMessage(Handler.java:99)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at android.os.Looper.loopOnce(Looper.java:230)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at android.os.Looper.loop(Looper.java:319)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at android.app.ActivityThread.main(ActivityThread.java:9063)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at java.lang.reflect.Method.invoke(Native Method)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:588)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
03-05 20:52:00.576 10573  4825  4825 I MonoDroid: 
03-05 20:52:00.576 10573  4825  4825 I MonoDroid:   --- End of managed Android.Runtime.JavaProxyThrowable stack trace ---

此行出现错误Specified cast is not valid. at Microsoft.Maui.Controls.Xaml.ApplyPropertiesVisitor.SetPropertyValue + 0xb9(Unknown Source)

我没有在其中看到任何可以确定演员异常的信息。也许另一双眼睛可以找到。

1 个回答

Voted

Prescott Chartier · Answer 1 · 2025-03-07T08:27:06+08:00

我逐行注释掉代码，直到应用程序运行而不会在调试器外崩溃。结果发现Style="{StaticResource IconLabelStyle}`每个Image标签中的行都是崩溃的根源。样式的定义包含在ResourceDictionary我下面发布的文件中。

    <ResourceDictionary\>  
        <Style x:Key="IconLabelStyle" TargetType="Label"\>  
            <Setter Property="FontSize" Value="Medium" /\>  
            <Setter Property="WidthRequest" Value="50" /\>  
            <Setter Property="VerticalTextAlignment" Value="Center" /\>  
            <Setter Property="HorizontalTextAlignment" Value="Center" /\>  
            <Setter Property="TextColor" Value="Black" /\>  
            <Setter Property="BackgroundColor" Value="Gold" /\>  
        </Style\>  
        <Style x:Key="LabelStyle" TargetType="Label"\>  
            <Setter Property="VerticalTextAlignment" Value="Center" /\>  
            <Setter Property="Padding" Value="5,5" /\>  
            <Setter Property="FontSize" Value="Medium" /\>  
            <Setter Property="BackgroundColor" Value="Gold" /\>  
        </Style\>  
    </ResourceDictionary\>

如您所见，ResourceDictionary TargetType=Label绝对不是标签。显然，编译器无法识别这些东西。这可以节省我很多时间。我Image为添加了样式ResourceDisctionary，现在它变成了：

        <ResourceDictionary>
            <Style x:Key="IconImageStyle" TargetType="Image">
                <Setter Property="WidthRequest" Value="20" />
                <Setter Property="HeightRequest" Value="20"/>
                <Setter Property="VerticalOptions"  Value="Center" />
                <Setter Property="HorizontalOptions" Value="Center" />
                <Setter Property="BackgroundColor" Value="Gold" />
            </Style>
            <Style x:Key="IconLabelStyle" TargetType="Label">
                <Setter Property="FontSize" Value="Medium" />
                <Setter Property="WidthRequest" Value="50" />
                <Setter Property="VerticalTextAlignment" Value="Center" />
                <Setter Property="HorizontalTextAlignment" Value="Center" />
                <Setter Property="TextColor" Value="Black" />
                <Setter Property="BackgroundColor" Value="Gold" />
            </Style>
            <Style x:Key="LabelStyle" TargetType="Label">
                <Setter Property="VerticalTextAlignment" Value="Center" />
                <Setter Property="Padding" Value="5,5" />
                <Setter Property="FontSize" Value="Medium" />
                <Setter Property="BackgroundColor" Value="Gold" />
            </Style>
        </ResourceDictionary>

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1 个回答

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