1.在Blazor WebAssembly应用程序中添加以下代码，以便允许AJAX进度触发：

builder.Services.Configure(options =>
{
    options.AllowSynchronousIO = true;
}); 

2.在文件上传组件的OnInitializedAsync方法中添加以下代码，以便在上传进度发生更改时触发进度事件：

protected async override Task OnInitializedAsync()
{
    HttpContent content = new MultipartFormDataContent();
    content.Add(new StreamContent(_file.OpenReadStream()),
                "file",
                _file.Name);
    var response = await _httpClient.PostAsync("api/FileUpload", content);
    response.EnsureSuccessStatusCode();

    var stream = await response.Content.ReadAsStreamAsync();
    var result = await JsonSerializer.DeserializeAsync(stream);
    Progress.Report(100);
}

3.对于AJAX进度事件的处理，添加以下代码以显示进度：

var percentage = e.loaded / e.total * 100;
jsRuntime.InvokeAsync