C#结合JavaScript实现上传视频到腾讯云点播平台的操作方法

<div>
<input type="file" accept=".mp4,.mp3" id="file1"  onchange="vUpload()" />
<img id="ajax_uploadFiles_curprogress" style="z-index:1;position:absolute;left:0px;top:4px;width:0px;height:12px" alt="" src="win7progress.jpg" />
<div id="ajax_uploadFiles_curbg" style="display:none;z-index:0;position:absolute;left:0px;top:4px;width:203px;height:12px;background-color:Gray"></div>
<div id="tip" style="z-index:0;position:absolute; font-size:9pt;left:205px;top:2px;height:12px;"></div>
</div>

public class Signature
         {
             public string m_strSecId;
             public string m_strSecKey;
             public int m_iRandom;
             public long m_qwNowTime;
             public int m_iSignValidDuration;
             public static long GetIntTimeStamp()
             {
                 TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1);
                 return Convert.ToInt64(ts.TotalSeconds);
             }
             private byte[] hash_hmac_byte(string signatureString, string secretKey)
             {
                 var enc = Encoding.UTF8; HMACSHA1 hmac = new HMACSHA1(enc.GetBytes(secretKey));
                 hmac.Initialize();
                 byte[] buffer = enc.GetBytes(signatureString);
                 return hmac.ComputeHash(buffer);
             }
             public string GetUploadSignature()
             {
                 string strContent = "";
                 strContent += ("secretId=" + Uri.EscapeDataString((m_strSecId)));
                 strContent += ("&currentTimeStamp=" + m_qwNowTime);
                 strContent += ("&expireTime=" + (m_qwNowTime + m_iSignValidDuration));
                 strContent += ("&random=" + m_iRandom);
                 byte[] bytesSign = hash_hmac_byte(strContent, m_strSecKey);
                 byte[] byteContent = System.Text.Encoding.Default.GetBytes(strContent);
                 byte[] nCon = new byte[bytesSign.Length + byteContent.Length];
                 bytesSign.CopyTo(nCon, 0);
                 byteContent.CopyTo(nCon, bytesSign.Length);
                 return Convert.ToBase64String(nCon);
             }
             public string getSign(int SignValidSeconds){
                 Signature sign = new Signature();
                 sign.m_strSecId = secretId;   //开发ID
                 sign.m_strSecKey = secretKey; //开发密钥
                 sign.m_qwNowTime = Signature.GetIntTimeStamp();
                 sign.m_iRandom = new Random().Next(0, 1000000);
                 sign.m_iSignValidDuration = SignValidSeconds;
                 return rv = "{\"errcode\":0,\"sign\":\"" + sign.GetUploadSignature() + "\",\"sdkid\":\"1111111111\"}";    
             }
         }

//引用必要的三个js
<script src="jquery-3.2.1.min.js"></script>
  <script src="es6-promise.auto.js"></script>
  <script src="vod-js-sdk-v6.js"></script>
  <script type="text/javascript">
      var sign = "";
      var sdkid="";
      var tcVod = null;
      var timer=null;
      var ws=0;
      var fileobj=document.getElementById('file1');
      var curbg=document.getElementById('ajax_uploadFiles_curbg');
      var progressBarWidth=parseInt(curbg.style.width,10);
//重新或尝试获取sign
      function resign() {
          return sign;
      }
//与服务器API地址交互获得签名值和SDKID，有效时间为3600秒
      function getsign() {
          $.ajax({
              type: "Post",
              url: '<%=ViewState["apiurl"].ToString()%>',
              contentType: "application/x-www-form-urlencoded;charset=utf-8",
              data: {
                  validSeconds: 3600
              },
              dataType: "json",
              success: function (res) {
                  //返回的数据用data.d获取内容   
                  if (res.errcode == 0) {
                      sign = res.sign;
                      sdkid=res.sdkid;
                      initTcVod();
                  } else {
                      alert('上传暂时无法使用。');
                  }
              },
              error: function (err) {
                      alert(err);
              }
          });
      }
      getsign();  //获取一次签名值
     function timetip(off) {
        var z = parseInt(off / 60, 10);
        var y = off % 60;
        var mtip='';
        var stip='';
        if(z==0&&y!=0){
          stip=y+'秒';
        } else if (z != 0 && y == 0) {
          mtip = z +'分钟';
        } else if (z != 0 && y != 0) {
          mtip = z + '分';
          stip = y + '秒';
        }  
        return mtip+stip;
    }
//初始化腾讯上传组件
      function initTcVod() {
          tcVod = new TcVod.default({getSignature: resign});
      }
//上传视频
            function vUpload(){
                  ws=0;
                  curbg.style.display='';
                  timer=window.setInterval(function(){ws++},1000);
                  var mediaFile = document.getElementById('file1').files[0];
                  var uploader = tcVod.upload({
                    mediaFile: mediaFile,mediaName:sdkid+mediaFile.name,
                  });
                  uploader.on('media_progress', function (info) {
                    fileobj.style.display='none';
                    document.getElementById('tip').innerHTML='已上传'+ Math.round(info.percent*100)+'%(耗时'+timetip(ws)+')';
                    document.getElementById('ajax_uploadFiles_curprogress').style.width=(progressBarWidth*info.percent)+'px';
                  })
                  uploader.on('media_upload', function (info) {
                    window.clearInterval(timer);
                    document.getElementById('tip').innerHTML='上传成功!';
                    执行后续操作...
                    }else{
                    }
                  })
            }
  </script>