<FormItem Label="上传">
            <InputFile OnChange="@LoadFiles" multiple />
</FormItem>

private async void LoadFiles(InputFileChangeEventArgs e)
  {
      foreach (var file in e.GetMultipleFiles())
      {
          string url = "https://xxxx.com/api/File/UploadFile";

          using HttpClientHandler handler = new();

          using HttpClient client = new(handler);
          client.DefaultVersionPolicy = HttpVersionPolicy.RequestVersionOrHigher;

          foreach (var header in headers)
          {
              client.DefaultRequestHeaders.Add(header.Key, header.Value);
          }

          string boundary = "----" + DateTime.UtcNow.Ticks.ToString("x");

          using MultipartFormDataContent formDataContent = new(boundary);

          byte[] imageByteArray;

          using (var memoryStream = new MemoryStream())
          {
              await file.OpenReadStream(1024*10000).CopyToAsync(memoryStream);
              imageByteArray = memoryStream.ToArray();
          }

          using var original = SKBitmap.Decode(imageByteArray);

          int maxSideLength = 1920;

          int width = 0;
          int height = 0;

          if (original.Width > original.Height)
          {
              if (original.Width > maxSideLength)
              {
                  var percent = maxSideLength / (float)original.Width;
                  width = (int)(original.Width * percent);
                  height = (int)(original.Height * percent);
              }
          }
          else
          {
              if (original.Height > maxSideLength)
              {
                  var percent = maxSideLength / (float)original.Height;
                  width = (int)(original.Width * percent);
                  height = (int)(original.Height * percent);
              }
          }

          using var resizeBitmap = original.Resize(new SKImageInfo(width, height), SKFilterQuality.High);
          using var image = SKImage.FromBitmap(resizeBitmap);
          using var imageData = image.Encode(SKEncodedImageFormat.Jpeg, 100);

          var fileContent = new StreamContent(imageData.AsStream());

          fileContent.Headers.ContentType = new MediaTypeHeaderValue(file.ContentType);
          formDataContent.Add(fileContent, "file", file.Name);

          var httpResponse = await client.PostAsync(url, formDataContent);

          string responseStr = httpResponse.Content.ReadAsStringAsync().Result;

          Console.WriteLine("Success");
      }
  }