提供了无效的请求 URI。请求 URI 必须是绝对 URI，或者必须设置 BaseAddress。在 Blazor答案

【问题标题】：An invalid request URI was provided. The request URI must either be an absolute URI or BaseAddress must be set. in Blazor提供了无效的请求 URI。请求 URI 必须是绝对 URI，或者必须设置 BaseAddress。在 Blazor
【发布时间】：2019-10-10 06:31:12
【问题描述】：

遇到控制器异常错误时出现“提供了无效的请求 URI。请求 URI 必须是绝对 URI 或必须设置 BaseAddress。”****strong text

blazor 服务器端

控制器调用不在 Razor 组件中执行查看代码

  async Task UploadFile()
  {
    try
    {
      LoginRepository loginRepository = new LoginRepository(new LaborgDbContext());
      DocumentService documentService = new DocumentService();
      var form = new MultipartFormDataContent();
      var content = new StreamContent(file.Data);
      content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("form-data")
      {
        Name = "files",
        FileName = file.Name
      };
      form.Add(content);
      var response = await HttpClient.PostAsync("/api/Document/Upload", form);    
    }
    catch (Exception ex)
    {
      throw ex;
    }

  }

控制器代码

[Route("api/[controller]/[action]")]
  [ApiController]
  public class UploadController : ControllerBase
  {
    private readonly IWebHostEnvironment _Env;

    public UploadController(IWebHostEnvironment env)
    {
      _Env = env;
    }
    [HttpPost()]
    public async Task<IActionResult> Post(List<IFormFile> files)
    {
      long size = files.Sum(f => f.Length);
      foreach (var formFile in files)
      {
        // full path to file in temp location
        var filePath = Path.GetTempFileName();
        if (formFile.Length > 0)
        {
          using (var stream = new FileStream(filePath, FileMode.Create))
          {
           await formFile.CopyToAsync(stream);
          }
        }

        System.IO.File.Copy(filePath, Path.Combine(_Env.ContentRootPath, "Uploaded", formFile.FileName)); 
      }

      return Ok(new { count = files.Count, size });
    }

启动

  public class Startup

{ 公共启动（IConfiguration 配置） { 配置=配置； }

public IConfiguration Configuration { get; }

// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
  services.AddAuthorizationCore();
  services.AddDbContext<ApplicationDbContext>(options =>
      options.UseSqlServer(
          Configuration.GetConnectionString("DefaultConnection")));
  services.AddDefaultIdentity<IdentityUser>()
      .AddEntityFrameworkStores<ApplicationDbContext>();
  services.AddRazorPages();
  services.AddServerSideBlazor();
  services.AddScoped<AuthenticationStateProvider, RevalidatingIdentityAuthenticationStateProvider<IdentityUser>>();
  services.AddSingleton<WeatherForecastService>();
  services.AddSingleton<TaskSchedulerService>();
  services.AddSingleton<TimeOffSchedulerService>();
  services.AddSingleton<DocumentService>();
  services.AddFileReaderService(options => options.InitializeOnFirstCall = true);
  services.AddSingleton<HttpClient>();

  services
.AddBlazorise(options =>
{
  options.ChangeTextOnKeyPress = true; // optional
})
.AddBootstrapProviders()
.AddFontAwesomeIcons();
}


public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
  if (env.IsDevelopment())
  {
    app.UseDeveloperExceptionPage();
    app.UseDatabaseErrorPage();
  }
  else
  {
    app.UseExceptionHandler("/Error");

    app.UseHsts();
  }

  app.UseHttpsRedirection();
  app.UseStaticFiles();

  app.UseRouting();
  app.UseEmbeddedBlazorContent(typeof(MatBlazor.BaseMatComponent).Assembly);
  app.UseEmbeddedBlazorContent(typeof(BlazorDateRangePicker.DateRangePicker).Assembly);
  app.UseAuthentication();
  app.UseAuthorization();

  app.UseEndpoints(endpoints =>
  {
    endpoints.MapControllers();
    endpoints.MapBlazorHub();
    endpoints.MapFallbackToPage("/_Host");
  });
}

} }

【问题讨论】：

请出示您的Startup.cs代码
包含 Startup.cs

标签： asp.net-core asp.net-apicontroller blazor-server-side

【解决方案1】：

startup.cs 页面并将以下代码添加到 app.UseEndpoints 方法的末尾（在 endpoints.MapFallbackToPage("/_Host"); 行下），以允许正确路由对控制器的 http 请求。

添加以下行 endpoints.MapControllerRoute("default", "{controller=Home}/{action=Index}/{id?}");

app.UseEndpoints(endpoints =>
      {
        endpoints.MapBlazorHub();
        endpoints.MapFallbackToPage("/_Host");
        endpoints.MapControllerRoute("default", "{controller=Home}/{action=Index}/{id?}");
      });

【讨论】：

我有同样的问题我的启动页面除了单例之外是相同的但是，当我尝试调用 Http.PostJsonAsync 我得到相同的错误消息 - 还有其他想法吗？我使用 vs 2019 创建了一个新的服务器端 blazor 应用程序

【解决方案2】：

https://github.com/dotnet/aspnetcore/issues/16840

当位置包含 %20 时 Blazor 抛出

来自：@msftbot

我们已将此问题移至待办事项里程碑。这意味着它不会在即将发布的版本中使用。我们将在当前版本之后重新评估积压，并在那时考虑这个项目。

【讨论】：