I found the cause of this error could be multiple things in your code. For me at least, the best way was to add verbose in command. With that will be able to understand what is the problem. the verbose will display all steps of the execution. In visual studio use: add-migration Added_something -verbose For … Read more
This is not currently supported out of the box in .net-core-3.0, .net-5, .net-6.0 or .net-7.0. There is currently an issue Support for EnumMemberAttribute in JsonConverterEnum #31081[1] requesting this functionality. In the interim, you will need to create your own JsonConverterFactory that serializes enums with custom value names specified by attributes. If you need to round-trip … Read more
There are three possibilities for getting the user in a component (a page is a component): Inject IHttpContextAccessor and from it access HttpContext and then User; need to register IHttpContextAccessor in Startup.ConfigureServices, normally using AddHttpContextAccessor. Edit: according to the Microsoft docs you must not do this for security reasons. Inject an AuthenticationStateProvider property, call GetAuthenticationStateAsync … Read more
I have received the same error after upgrading my ASP.NET Core project from .NET Core 3.0 to 3.1 and installing Microsoft .NET Core 3.1.0 – Windows Server Hosting. Quick (but bad) fix changed the web.config handler from AspNetCoreModuleV2 to AspNetCoreModule and it worked ok. Good fix Find the underlying cause by inspecting Event Viewer. There … Read more
I’m looking at .Net Core 3.1, where this should ignore null values services.AddControllers().AddJsonOptions(options => { options.JsonSerializerOptions.IgnoreNullValues = true; }); While in .NET 5 and later, set JsonSerializerOptions.DefaultIgnoreCondition to JsonIgnoreCondition.WhenWritingNull: services.AddControllers().AddJsonOptions(options => { options.JsonSerializerOptions.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull; }); Note, the above isn’t per property/attribute, although there is an attribute which may be helpful JsonIgnoreAttribute. An alternative, to … Read more
After some research, I eventually found the answer here Before seeing this page, I knew that I should use AddSecurityRequirement after AddSecurityDefinition because of many samples, but it was a problem that the function parameters have changed on .NET Core 3.0. By the way, the final answer is as below: services.AddSwaggerGen(c => { c.SwaggerDoc(“v1”, new … Read more
If for example the worker class needed access to some data stored in your appsettings public class Worker : BackgroundService { private readonly ILogger<Worker> logger; private readonly WorkerOptions options; public Worker(ILogger<Worker> logger, WorkerOptions options) { this.logger = logger; this.options = options; } protected override async Task ExecuteAsync(CancellationToken stoppingToken) { while (!stoppingToken.IsCancellationRequested) { //do something that … Read more
New System.Text.Json serialization ASP.NET MVC Core 3.0 uses built-in JSON serialization. Use System.Text.Json.Serialization.JsonStringEnumConverter (with “Json” prefix): services .AddMvc() // Or .AddControllers(…) .AddJsonOptions(opts => { var enumConverter = new JsonStringEnumConverter(); opts.JsonSerializerOptions.Converters.Add(enumConverter); }) More info here. The documentation can be found here. If you prefer Newtonsoft.Json You can also use “traditional” Newtonsoft.Json serialization: Install-Package Microsoft.AspNetCore.Mvc.NewtonsoftJson And then: … Read more
No, they have clearly stated that these are windows only. In one of the .NET Core 3.0 discussions, they have also clarified that they do not intend to make these features cross-platform in the future since the whole concept is derived from windows specific features. They talked about thinking of a whole new idea for … Read more
There is an option in Tools -> Options that enables preview versions of the .NET Core SDK. In the VS Preview shipping channel, it is on (by default, and not settable). In the VS Release channel, it defaults to off and you can opt-in. (Note: it’s disabled in the screenshot because I have a Preview … Read more