使用WebClient类对网页下载源码,对文件下载保存及异步下载并报告下载进度

最新推荐文章于 2025-08-04 10:26:33 发布

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最新推荐文章于 2025-08-04 10:26:33 发布

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原文链接：http://www.cnblogs.com/lunawzh/p/5540589.html

本文介绍了一个简单的C#程序示例，演示了如何使用WebClient类从互联网上下载字符串数据、文件，并且实现异步下载过程中的进度显示。

private void button1_Click(object sender, EventArgs e)
        {
            WebClient webclient = new WebClient();
            webclient.Proxy = null;
            webclient.Encoding = Encoding.UTF8;
            richTextBox1.AppendText(webclient.DownloadString(textBox1.Text.Trim()));
            webclient.Dispose();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            WebClient webclient = new WebClient();
            webclient.Proxy = null;
            webclient.DownloadFile(textBox2.Text, textBox3.Text);
            MessageBox.Show("成功！");
            webclient.Dispose();

        }

        private void button3_Click(object sender, EventArgs e)
        {
            WebClient webclient = new WebClient();
            webclient.Proxy = null;
            webclient.DownloadProgressChanged += webclient_DownloadProgressChanged;
            webclient.DownloadDataCompleted += webclient_DownloadDataCompleted;
            webclient.DownloadFileAsync(new Uri(textBox2.Text), textBox3.Text);
            webclient.Dispose();
        }

        void webclient_DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e)
        {
            MessageBox.Show("成功");
        }

        void webclient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            progressBar1.Value = e.ProgressPercentage;
        }