在 C#中使用HttpClient上传大文件的同时显示上传进度

  private async void button2_Click(object sender, EventArgs e)
        {
            HttpClientHandler handler = new HttpClientHandler();
            ProgressMessageHandler progressMessageHandler = new ProgressMessageHandler(handler);
            progressMessageHandler.HttpSendProgress += ProgressMessageHandler_HttpSendProgress;
            var httpClient = new HttpClient(progressMessageHandler);
            httpClient.Timeout = Timeout.InfiniteTimeSpan;
            var url = "http://10.141.40.176:5236/main/Uploadfile";
            var content = new MultipartFormDataContent();
            content.Add(new StringContent("ulami"), "Department");
            content.Add(new StringContent("1"), "taskname");
            content.Add(new StringContent("false"), "cover");
           // StringContent loginContent = new StringContent("{\"username\":\"admin\",\"password\":\"123456\"}", Encoding.UTF8, "application/json");
            var filepath = textBox1.Text;//97.6MB
            using var fileStream = new FileStream(filepath, FileMode.Open, FileAccess.Read);
            using var streamContent = new StreamContent(fileStream, 102400);
            content.Add(streamContent, "file", "测试文件1.ppt");
            var response = await httpClient.PostAsync(url, content);
            var str = await response.Content.ReadAsStringAsync();
            textBox2.Text = str;
            //    try
            //    {
            //        //上传服务器的地址（web服务）
            //        string address = "http://10.141.40.176:7245/main/dwj";
            //        //上传后文件保存的名称
            //        string saveName = DateTime.Now.ToString("yyyyMMddHHmmss");
            //        int count = FileUpload.UpLoad_Request(address, filePath, saveName,progressBar1);
            //        if (count > 0)
            //        {
            //            MessageBox.Show("上传文件成功！");
            //        }
            //        else
            //        {
            //            MessageBox.Show("上传文件失败！");
            //        }
            //    }
            //    catch (Exception ex)
            //    {

            //        Console.WriteLine(ex.Message);
            //    }
        }

        private void ProgressMessageHandler_HttpSendProgress(object sender, HttpProgressEventArgs e)
        {
            Console.WriteLine(e.ProgressPercentage + "%");
        }