Radzen Upload -- OpenReadStream Errors

Adrian0012 · June 27, 2024, 11:45am

Hello,

I am looking to implement the Upload Component and every time I call OpenReadStream on a file of type Radzen.FileInfo I get a null reference error.
Not doing anything fancy, pretty much following the example provided in the docs.
My file however does not look quite right:

{Radzen.FileInfo}
    ContentType: 'file.ContentType' threw an exception of type 'System.NullReferenceException'
    LastModified: 'file.LastModified' threw an exception of type 'System.NullReferenceException'
    Name: "abc.pdf"
    Size: 373767
    Source: null

Any advice / support is greatly appreciated.

enchev · June 27, 2024, 12:21pm

You can download and debug our demos to check what’s different compared to your app.

Adrian0012 · June 27, 2024, 1:04pm

this is pretty much what I have done, lifted the code from the example in order to check how it works but with no success

enchev · June 27, 2024, 1:28pm

Try with smaller file size - you’ve might hit some of the Blazor WebSocket limitations. In our demos we’ve extended various max values:

github.com

radzenhq/radzen-blazor/blob/master/RadzenBlazorDemos.Host/Program.cs#L32


      
          {
              // Get the address that the app is currently running at
              var server = sp.GetRequiredService<IServer>();
              var addressFeature = server.Features.Get<IServerAddressesFeature>();
              string baseAddress = addressFeature.Addresses.First();
              return new HttpClient { BaseAddress = new Uri(baseAddress) };
          });
          builder.Services.AddDistributedMemoryCache();
          builder.Services.Configure<Microsoft.AspNetCore.Http.Features.FormOptions>(options =>
          {
              options.MultipartBodyLengthLimit = long.MaxValue;
          });
          
          // Add Radzen.Blazor services
          builder.Services.AddRadzenComponents();
          
          // Demo services
          builder.Services.AddScoped<ThemeService>();
          builder.Services.AddScoped<CompilerService>();
          builder.Services.AddScoped<ExampleService>();

github.com

radzenhq/radzen-blazor/blob/master/RadzenBlazorDemos.Server/Program.cs#L17


      
          using RadzenBlazorDemos.Data;

          using RadzenBlazorDemos.Services;

          

          var builder = WebApplication.CreateBuilder(args);

          

          // Add services to the container.

          builder.Services.AddRazorPages();

          builder.Services.AddRazorComponents()

              .AddInteractiveServerComponents().AddHubOptions(o =>

          {

              o.MaximumReceiveMessageSize = 10 * 1024 * 1024;

          });

          builder.Services.AddSingleton(sp =>

          {

              // Get the address that the app is currently running at

              var server = sp.GetRequiredService<IServer>();

              var addressFeature = server.Features.Get<IServerAddressesFeature>();

              string baseAddress = addressFeature != null ? addressFeature.Addresses.First() : string.Empty;

              return new HttpClient { BaseAddress = new Uri(baseAddress) };

          });