使多个API请求并行，并在asp.net中接收到任何一个响应后立即显示数据。

protected async void Page_Load(object sender, EventArgs e)
{
    // 创建多个API请求的Task
    Task<string> apiRequest1 = GetApiResponseAsync("API1");
    Task<string> apiRequest2 = GetApiResponseAsync("API2");
    Task<string> apiRequest3 = GetApiResponseAsync("API3");

    // 并行处理多个API请求
    Task<string>[] apiRequests = { apiRequest1, apiRequest2, apiRequest3 };
    while (apiRequests.Length > 0)
    {
        Task<string> completedTask = await Task.WhenAny(apiRequests);
        apiRequests = apiRequests.Where(t => t != completedTask).ToArray();

        // 处理接收到的API响应
        string responseData = await completedTask;
        // 更新页面上的数据，例如将responseData绑定到前端控件或使用JavaScript更新页面
        // ...
    }
}

private async Task<string> GetApiResponseAsync(string apiEndpoint)
{
    // 发起API请求并等待响应
    using (HttpClient client = new HttpClient())
    {
        HttpResponseMessage response = await client.GetAsync(apiEndpoint);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync();
    }
}