跟踪WebClient上传进度

本文关键字：WebClient 跟踪 | 更新日期: 2023-09-27 18:15:12

所以我目前通过php脚本在我的web服务器上使用以下代码上传文件:

string file = "dp.jpg";
System.Net.WebClient Client = new System.Net.WebClient();
Client.Headers.Add("Content-Type", "binary/octet-stream");
byte[] result = Client.UploadFile("http://localhost/upload.php", "POST", file);
String response = System.Text.Encoding.UTF8.GetString(result, 0, result.Length);

我想知道的是我如何使用这个，或者一个不同的方法来跟踪它上传了多少，并在进度条上显示它?

谢谢。

跟踪WebClient上传进度

使用UploadFileAsync

服从wcUploader.UploadFileCompleted和wcUploader.UploadProgressChanged事件，以便您可以获得上传进度和上传完成。

在下面的代码中，您可以检查我们如何订阅UploadProgressChanged和可以得到e.ProgressPercentage值

检查以下代码片段:

using System;
using System.Net;
using System.Text;
using System.Threading;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private readonly WebClient wcUploader = new WebClient();
        public Form1()
        {
            InitializeComponent();
            wcUploader.UploadFileCompleted += UploadFileCompletedCallback;
            wcUploader.UploadProgressChanged += UploadProgressCallback;
        }

        private void UploadFileCompletedCallback(object sender, UploadFileCompletedEventArgs e)
        {
            // a clever way to handle cross-thread calls and avoid the dreaded
            // "Cross-thread operation not valid: Control 'textBox1' accessed 
            // from a thread other than the thread it was created on." exception
            // this will always be called from another thread,
            // no need to check for InvokeRequired
            BeginInvoke(
                new MethodInvoker(() =>
                    {
                        textBox1.Text = Encoding.UTF8.GetString(e.Result);
                        button1.Enabled = true;
                    }));
        }
        private void UploadProgressCallback(object sender, UploadProgressChangedEventArgs e)
        {
            // a clever way to handle cross-thread calls and avoid the dreaded
            // "Cross-thread operation not valid: Control 'textBox1' accessed 
            // from a thread other than the thread it was created on." exception
            // this will always be called from another thread,
            // no need to check for InvokeRequired
            BeginInvoke(
                new MethodInvoker(() =>
                    {
                        textBox1.Text = (string)e.UserState + "'n'n"
                                        + "Uploaded " + e.BytesSent + "/" + e.TotalBytesToSend
                                        + "b (" + e.ProgressPercentage + "%)";
                    }));
        }
        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                button1.Enabled = false;
                string toUpload = openFileDialog1.FileName;
                textBox1.Text = "Initiating connection";
                new Thread(() =>
                           wcUploader.UploadFileAsync(new Uri("http://anyhub.net/api/upload"), "POST", toUpload)).Start();
            }
        }
    }
}

从这里提取的代码片段:

UploadFileAsync不是异步的?

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