我创建了一个类型为“.NET MAUI Blazor Hybrid and Web App” 的项目，并进行了一些修改。 在启动该应用的Windows版本时，出现了“发生了未处理的错误”消息：

发生了未处理的错误。重新加载 🗙

在浏览器开发者工具中没有任何错误（是的，即使在Windows原生应用中也可能启动浏览器开发者工具——我推测是因为.NET MAUI使用了WebView）：

调试输出中也没有任何错误线索：

'Myapp.Native.exe' (CoreCLR: DefaultDomain): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Private.CoreLib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Myapp.Native.dll'. Symbols loaded.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'c:\program files\microsoft visual studio\18\community\common7\ide\extensions\microsoft\managedprojectsystem\HotReload\net10.0\Microsoft.Extensions.DotNetDeltaApplier.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Linq.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Runtime.Loader.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Console.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Collections.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Runtime.InteropServices.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Collections.Concurrent.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.IO.Pipes.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Threading.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Threading.Overlapped.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Security.AccessControl.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Security.Principal.Windows.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Security.Claims.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\WinRT.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.WinUI.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\Microsoft Visual Studio\18\Community\Common7\IDE\PrivateAssemblies\Runtime\Microsoft.VisualStudio.Debugger.Runtime.NetCoreApp.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Memory.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Runtime.CompilerServices.Unsafe.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.ObjectModel.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Windows.SDK.NET.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Numerics.Vectors.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Private.Uri.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.ComponentModel.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Security.Cryptography.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.InteractiveExperiences.Projection.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Maui.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Linq.Expressions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Maui.Essentials.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Maui.Controls.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.DependencyInjection.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.Hosting.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.Logging.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.Configuration.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.Diagnostics.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Maui.Controls.Xaml.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Xml.ReaderWriter.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Private.Xml.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.AspNetCore.Components.WebView.Maui.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.Logging.Debug.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.Configuration.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.FileProviders.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Diagnostics.DiagnosticSource.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Maui.Graphics.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Net.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.ComponentModel.TypeConverter.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Maui.Graphics.Win2D.WinUI.Desktop.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.AspNetCore.Components.WebView.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.Logging.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.JSInterop.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.AspNetCore.Components.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.AspNetCore.Components.Web.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.Options.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.DependencyInjection.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Diagnostics.Tracing.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Threading.ThreadPool.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Text.Json.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Myapp.Shared.dll'. Symbols loaded.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Reflection.Emit.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'Snippets'. 
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Reflection.Emit.Lightweight.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Reflection.Emit.ILGeneration.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Reflection.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Extensions.FileProviders.Composite.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Web.WebView2.Core.Projection.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'D:\Myapp\Native\bin\Debug\net10.0-windows10.0.19041.0\win-x64\Microsoft.Graphics.Canvas.Interop.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\Microsoft.Win32.Registry.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'c:\program files\microsoft visual studio\18\community\common7\ide\commonextensions\microsoft\xamldiagnostics\Mobile\Microsoft.Maui.Controls.HotReload.Forms.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\netstandard.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'c:\program files\microsoft visual studio\18\community\common7\ide\commonextensions\microsoft\xamldiagnostics\Mobile\Microsoft.VisualStudio.DesignTools.MobileTapContracts.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'c:\program files\microsoft visual studio\18\community\common7\ide\commonextensions\microsoft\xamldiagnostics\Mobile\Microsoft.VisualStudio.DesignTools.TapContract.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Threading.Thread.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Text.RegularExpressions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Runtime.Serialization.Json.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Private.DataContractSerialization.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Runtime.Serialization.Xml.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Text.Encoding.Extensions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Runtime.Serialization.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'c:\program files\microsoft visual studio\18\community\common7\ide\commonextensions\microsoft\xamldiagnostics\Mobile\Microsoft.VisualStudio.DesignTools.XamlTapContract.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Text.Encodings.Web.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Collections.Immutable.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.IO.Pipelines.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.3\System.Collections.NonGeneric.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Myapp.Native.exe' (CoreCLR: clrhost): Loaded 'Anonymously Hosted DynamicMethods Assembly'.

我不会详细说明我进行了哪些具体的修改，因为这个问题的目标是从某种输出中找出原因。即使我回滚这些修改，这个问题未来仍可能再次出现，回滚也不能解决，但我也不愿再去面对这种麻烦。我的问题是，如何获取会指向该问题的输出？

顺便说一句，An unhandled error has occurred. 消息属于 MainLayout.razor，这是自动生成的布局文件：

@inherits LayoutComponentBase

@Body

<div id="blazor-error-ui" data-nosnippet>
    An unhandled error has occurred.
    <a href="." class="reload">Reload</a>
    <span class="dismiss">🗙</span>
</div>

也许知道它是如何被触发的，可能会成为线索。

更新

我已经按照建议尝试使用 ErrorBoundary。 之前，Shared/Layout/MainLayout.razor 是：

@inherits LayoutComponentBase

@Body

<div id="blazor-error-ui" data-nosnippet>
    An unhandled error has occurred.
    <a href="." class="reload">Reload</a>
    <span class="dismiss">🗙</span>
</div>

现在是：

@using MyMapp.Shared.Components

@inherits LayoutComponentBase

<MyErrorBoundary>
    @Body
</MyErrorBoundary>

其中 MyErrorBoundary 是：

<ErrorBoundary @ref="_errorBoundary">

  <ChildContent>
    @ChildContent
  </ChildContent>

  <ErrorContent>
    @if (ErrorContent is not null)
    {
      @ErrorContent(context)
    }
    else
    {
      <div class="my-error-boundary">
        <p>An unhandled error has occurred.</p>
        <p>@context.Message</p>
        <button class="reload" @onclick="Recover">Reload</button>
      </div>
    }
  </ErrorContent>

</ErrorBoundary>

@code {

  private ErrorBoundary? _errorBoundary;

  [Parameter] 
  public RenderFragment? ChildContent { get; set; }

  [Parameter] 
  public RenderFragment<Exception>? ErrorContent { get; set; }

  public void Recover()
  {
      _errorBoundary?.Recover();
  }

}

没有错误信息：

但是，如果回滚修改，仍会再次显示“发生了未处理的错误。”：

解决方案

从 MainLayout.razor 文件可以看出，包含“发生了未处理的错误”这条信息的元素并没有进行条件渲染：

@inherits LayoutComponentBase

@Body

<div id="blazor-error-ui" data-nosnippet>
    An unhandled error has occurred.
    <a href="." class="reload">Reload</a>
    <span class="dismiss">🗙</span>
</div>

相反，使用的是对动态CSS样式的处理。初始时，ID为 blazor-error-ui 的元素通过 display: none 被隐藏。 该规则在 MainLayout.razor.css 中声明：

#blazor-error-ui {
    color-scheme: light only;
    background: lightyellow;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}

    #blazor-error-ui .dismiss {
        cursor: pointer;
        position: absolute;
        right: 0.75rem;
        top: 0.5rem;
    }

因此如果由于某种原因页面无法访问该样式表，消息就会显示出来。这正是上述情形发生的原因。

感谢 Mister Magoo 和 H.A.H. 指出并定位了这个原因。