我使用 VS 中包含的模板创建了一个 Blazor Webassembly 应用程序,其中包含授权和 ASP.NET Core 托管选项,如下所示:
我希望能够在未经身份验证的情况下向服务器发出 http 请求。我通过注释掉 WeatherForecastController
属性(甚至添加了 [Authorize]
属性)更改了 [AllowAnonymous]
中的代码:
//[Authorize] CHANGED
[AllowAnonymous] //CHANGED
[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
private static readonly string[] Summaries = new[]
{
"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
};
private readonly ILogger<WeatherForecastController> _logger;
public WeatherForecastController(ILogger<WeatherForecastController> logger)
{
_logger = logger;
}
[HttpGet]
public IEnumerable<WeatherForecast> Get()
{
var rng = new Random();
return Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
Date = DateTime.Now.AddDays(index),
TemperatureC = rng.Next(-20, 55),
Summary = Summaries[rng.Next(Summaries.Length)]
})
.ToArray();
}
}
在 FetchData.razor
页面中,连同代码中指出的其他更改,我注释掉了 @attribute [Authorize]
:
@page "/fetchdata"
@using Microsoft.AspNetCore.Authorization
@using Microsoft.AspNetCore.Components.WebAssembly.Authentication
@using StackOverflowAuthProblem.Shared
@*@attribute [Authorize]*@ @*CHANGED*@
@inject HttpClient Http
@*CHANGED Html removed for brevity*@
<div>Exception message: @exceptionMessage</div>
@code {
private WeatherForecast[] forecasts;
string exceptionMessage; //CHANGED
protected override async Task OnInitializedAsync()
{
try
{
forecasts = await Http.GetFromJsonAsync<WeatherForecast[]>("WeatherForecast");
}
catch (AccessTokenNotAvailableException exception)
{
exceptionMessage = exception.Message; //CHANGED returns an empty string
exceptionMessage = exception.ToString(); //CHANGED returns
//Microsoft.AspNetCore.Components.WebAssembly.Authentication.AccessTokenNotAvailableException: '' at
//Microsoft.AspNetCore.Components.WebAssembly.Authentication.AuthorizationMessageHandler.SendAsync(HttpRequestMessage request,
//CancellationToken cancellationToken) at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(
// HttpRequestMessage request, CancellationToken cancellationToken)
//at System.Net.Http.HttpClient.SendAsyncCore(HttpRequestMessage request,
//HttpCompletionOption completionOption, Boolean async, Boolean emitTelemetryStartStop,
//CancellationToken cancellationToken)
//at System.Net.Http.Json.HttpClientJsonExtensions.<GetFromJsonAsyncCore>d__9`1[[StackOverflowAuthProblem.Shared.WeatherForecast[],
//StackOverflowAuthProblem.Shared, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext()
//at StackOverflowAuthProblem.Client.Pages.FetchData.OnInitializedAsync()
//in E:\StackOverflow\StackOverflowAuthProblem\StackOverflowAuthProblem\Client\Pages\FetchData.razor:line 53
//exception.Redirect(); CHANGE
}
}
}
我得到的异常在上面的代码中。我怀疑问题出在 App.razor
页面上,但无法弄清楚。
有什么帮助吗?