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我目前正在学习有关如何构建 ASP.NET blazor 应用程序的课程并且已经走到了死胡同。正如标题所述，方法 CreateMauiApp() 需要一个 void 返回类型。一个关键的区别是我正在学习一门 1 岁的课程，并且不包括我正在使用的毛伊岛。有没有人知道这个问题的解决方法？

 public static class MauiProgram
{
    public static async MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder
            .RegisterBlazorMauiWebView()
            .UseMauiApp<App>()
            .ConfigureFonts(fonts =>
            {
                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
            });
        //builder.Services.AddSingleton<IUserManager, UserManager>();
        //builder.Services.AddSingleton<WeatherForecastService>();

        builder.Services.AddSingleton<IUserManager, UserManagerFake>();
        builder.Services.AddScoped<ICurrentUserService, CurrentUserService>();

        builder.Services.AddBlazorWebView();


        var host = builder.Build();
        var currentUserService = host.Services.GetRequiredService<ICurrentUserService>();
        TestData.CreateTestUser();
        currentUserService.CurrentUser = TestData.TestUser;

        await host.RunAsync();
        
    }
}

}

错误信息：

错误 CS0161 'MauiProgram.CreateMauiApp()'：并非所有代码路径都返回值 UdemyCourseIntro (net6.0-android)、UdemyCourseIntro (net6.0-ios)、UdemyCourseIntro (net6.0-maccatalyst)、UdemyCourseIntro (net6.0- windows10.0.19041) C:\Users\matej\source\repos\UdemyCourseIntro\UdemyCourseIntro\MauiProgram.cs 11 活动

错误 CS1983 异步方法的返回类型必须为 void、Task、Task、类似任务的类型、IAsyncEnumerable 或 IAsyncEnumerator UdemyCourseIntro (net6.0-android)、UdemyCourseIntro (net6.0-ios)、UdemyCourseIntro (net6.0 -maccatalyst), UdemyCourseIntro (net6.0-windows10.0.19041) C:\Users\matej\source\repos\UdemyCourseIntro\UdemyCourseIntro\MauiProgram.cs 11 活动

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1 回答 1

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所以这个问题正如某人在其中一条评论中礼貌地陈述的那样。我所要做的就是删除异步并返回一个 MauiApp 对象。

public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder
            .RegisterBlazorMauiWebView()
            .UseMauiApp<App>()
            .ConfigureFonts(fonts =>
            {
                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
            });
        //builder.Services.AddSingleton<IUserManager, UserManager>();
        builder.Services.AddSingleton<IUserManager, UserManagerFake>();
        builder.Services.AddScoped<ICurrentUserService, CurrentUserService>();

        builder.Services.AddBlazorWebView();

        //builder.Services.AddSingleton<WeatherForecastService>();

        var host = builder.Build();
        var currentUserService = host.Services.GetRequiredService<ICurrentUserService>();
        TestData.CreateTestUser();
        currentUserService.CurrentUser = TestData.TestUser;

        host.RunAsync();

        return host;
    }
}

}

于 2022-02-24T11:38:54.923 回答