C# HttpClient Post参数同时上传文件的实现

using (var client = new HttpClient())
{
    using (var multipartFormDataContent = new MultipartFormDataContent())
    {
        var values = new[]
        {
            new KeyValuePair<string, string>("c", "3"),
            new KeyValuePair<string, string>("c", "2"),
            new KeyValuePair<string, string>("d", "2")
             //other values
        };
 
        foreach (var keyValuePair in values)
        {
            multipartFormDataContent.Add(new StringContent(keyValuePair.Value),
                String.Format("\"{0}\"", keyValuePair.Key));
        }
 
        multipartFormDataContent.Add(new ByteArrayContent(System.IO.File.ReadAllBytes(@"D:\test.jpg")),
            "\"pic\"",
            "\"test.jpg\"");
 
        var requestUri = "http://localhost:8080";
        var html = client.PostAsync(requestUri, multipartFormDataContent).Result.Content.ReadAsStringAsync().Result;
    }
}

string reqUrl = JsonrpcHttpClient.MakeRpcUrl(typeof(Wfm_SimReport).Name, "save");
using (HttpClient client = new HttpClient(new HttpClientHandler() { UseCookies = false }))//若想手动设置Cookie则必须设置UseCookies = false
{
                               
    string boundary = string.Format("----WebKitFormBoundary{0}",DateTime.Now.Ticks.ToString("x"));
    MultipartFormDataContent content = new MultipartFormDataContent(boundary);
 
    #region 设置请求参数
    content.Headers.ContentType = MediaTypeHeaderValue.Parse("multipart/form-data");
    content.Headers.Add("Cookie", TokenManager.Token);
    content.Headers.Add("client", "true");
 
    #endregion
    if (string.IsNullOrEmpty(fullPath) && !File.Exists(fullPath))
    {
        return false;
    }
 
    string fileName = Path.GetFileName(fullPath);
 
    #region Stream请求
    FileStream fStream = File.Open(fullPath, FileMode.Open, FileAccess.Read);
    content.Add(new StreamContent(fStream, (int)fStream.Length), "file", fileName);
                
    #endregion
    content.Add(new StringContent(JsonHelper.Serialize(entity)), "dtoStr");
    var result = client.PostAsync(reqUrl, content).Result;
 
    try
    {
        if (result.IsSuccessStatusCode)
        {
            string rslt = result.Content.ReadAsStringAsync().Result;
            Debug.WriteLine(rslt);
            return true;
        }
    }
    catch (Exception ex)
    {
        Debug.WriteLine(string.Format("获取服务器返回结果错误：消息：{0},堆栈：{1}",ex.Message,ex.StackTrace));
    }
    finally
    {
        //关闭文件流
        fStream.Close();
        client.Dispose();
    }                
 }