c#HTTP POST – 需要跟踪发布/上传进度

发布时间：2020-12-16 09:36:52 所属栏目：百科来源：网络整理

导读：我的代码可以很好地将文件POST到预先签名的Amazon S3网址.但是,我想跟踪大文件的POST /上传进度.有没有一种简单的方法将其添加到我的代码中？我该怎么做？我不需要进度条,只需要输出到控制台,文件传输的百分比是完整的,例如： 123etc WebRequest request = W

我的代码可以很好地将文件POST到预先签名的Amazon S3网址.但是,我想跟踪大文件的POST /上传进度.有没有一种简单的方法将其添加到我的代码中？我该怎么做？我不需要进度条,只需要输出到控制台,文件传输的百分比是完整的,例如：
123etc

WebRequest request = WebRequest.Create(PUT_URL_FINAL[0]);
//PUT_URL_FINAL IS THE PRE-SIGNED AMAZON S3 URL THAT I AM SENDING THE FILE TO

request.Timeout = 360000; //6 minutes

request.Method = "PUT";

//result3 is the filename that I am sending                                     
request.ContentType = MimeType(result3)

byte[] byteArray =
    File.ReadAllBytes(result3);

request.ContentLength = byteArray.Length;

Stream dataStream = request.GetRequestStream();

dataStream.Write(byteArray,byteArray.Length); 

dataStream.Close();

//This will return "OK" if successful.
WebResponse response = request.GetResponse();
Console.WriteLine("++ HttpWebResponse: " +
                  ((HttpWebResponse)response).StatusDescription);

解决方法

我会使用WebClient的UploadDataAsync() method并绑定到其UploadProgressChanged event.

– 更新：更改样本以使用UploadDataAsync而不是UploadFileAsync

稍微修改过的样本来自MSDN：

public static void UploadDataInBackground (string address,byte[] data)
    {
        WebClient client = new WebClient ();
        Uri uri = new Uri(address);


        // Specify a progress notification handler.
        client.UploadProgressChanged += new UploadProgressChangedEventHandler(UploadProgressCallback);
        client.UploadDataAsync (uri,"POST",data);
        Console.WriteLine ("Data upload started.");
    }

private static void UploadProgressCallback(object sender,UploadProgressChangedEventArgs e)
{
    // Displays the operation identifier,and the transfer progress.
    Console.WriteLine("{0}    uploaded {1} of {2} bytes. {3} % complete...",(string)e.UserState,e.BytesSent,e.TotalBytesToSend,e.ProgressPercentage);
}

（编辑：李大同）

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