请使用Windows.Web.Http来优化下面的代码 public Http() { // 请求头设置 var headers = httpClient.DefaultRequestHeaders; headers.Add("Accept", "application/json"); string header = "ie"; if (!headers.UserAgent.TryParseAdd(header)) { throw new Exception("Invalid header value: " + header); } header = "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64;Trident / 6.0)"; if (!headers.UserAgent.TryParseAdd(header)) { throw new Exception("Invalid header value: " + header); } }

使用Windows.Web.Http来优化上面的代码，可以按照以下方式进行修改：

using Windows.Web.Http;
using Windows.Web.Http.Headers;

...

public class Http
{
    private readonly HttpClient _httpClient;

    public Http()
    {
        _httpClient = new HttpClient();
        _httpClient.DefaultRequestHeaders.Accept.Add(new HttpMediaTypeWithQualityHeaderValue("application/json"));
        string header = "ie";
        if (!_httpClient.DefaultRequestHeaders.UserAgent.TryParseAdd(header))
        {
            throw new Exception("Invalid header value: " + header);
        }
        header = "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64;Trident / 6.0)";
        if (!_httpClient.DefaultRequestHeaders.UserAgent.TryParseAdd(header))
        {
            throw new Exception("Invalid header value: " + header);
        }
    }

    // 其他方法...

    public async Task<ResponseResult> PostDataAsync(string url, string data)
    {
        // 发送POST请求...
    }
}

在上述代码中，我们使用了Windows.Web.Http中的HttpClient、HttpMediaTypeWithQualityHeaderValue和相关类型来处理HTTP请求和请求头。请确保已添加对Windows.Web.Http命名空间的引用，并根据你的需求对代码进行适当的调整。