C# 使用HttpClient 上传文件

using (var httpClient = new HttpClient())
{
    string boundary = "----Boundary" + DateTime.Now.Ticks.ToString("x");
   
    using (var multipartFormDataContent = new MultipartFormDataContent(boundary))
    {
        var values = new[]
        {
            new KeyValuePair("id", snapOrRecords[i].fileId),
            //new KeyValuePair("file", "2"),
        };

        foreach (var keyValuePair in values)
        {
            multipartFormDataContent.Add(new StringContent(keyValuePair.Value),
                String.Format("\"{0}\"", keyValuePair.Key));
        }

        multipartFormDataContent.Add(
            new ByteArrayContent(System.IO.File.ReadAllBytes(@".\108摄像机_0_1698051272697.png")),
            "file",
            "108摄像机_0_1698051272697.png");

        multipartFormDataContent.Headers.ContentType = MediaTypeHeaderValue.Parse("multipart/form-data; boundary=" + boundary);

        var requestUri = "http://192.168.1.34:12001/sms/file/uploadById";
        var html = httpClient.PostAsync(requestUri, multipartFormDataContent).Result.Content.ReadAsStringAsync().Result;
    }
 }