截图
 <xmp> using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.IO; using System.Net; using System.Threading; namespace DownLoad { /// <summary> /// Form1 的摘要说明。 /// </summary> public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private System.Windows.Forms.TextBox txtURI; private System.Windows.Forms.TextBox txtPath; private System.Windows.Forms.Button btnSelect; private System.Windows.Forms.Button btnDownLoad; private System.Windows.Forms.StatusBar stBar; private System.Windows.Forms.FolderBrowserDialog folderBD; //使用WebClient的方法以实现文件的下载 private WebClient client=new WebClient(); /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.Container components = null;
public Form1() { // // Windows 窗体设计器支持所必需的 // InitializeComponent();
// // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 // }
/// <summary> /// 清理所有正在使用的资源。 /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); }
#region Windows 窗体设计器生成的代码 /// <summary> /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void InitializeComponent() { this.label1 = new System.Windows.Forms.Label(); this.label2 = new System.Windows.Forms.Label(); this.txtURI = new System.Windows.Forms.TextBox(); this.txtPath = new System.Windows.Forms.TextBox(); this.folderBD = new System.Windows.Forms.FolderBrowserDialog(); this.btnSelect = new System.Windows.Forms.Button(); this.btnDownLoad = new System.Windows.Forms.Button(); this.stBar = new System.Windows.Forms.StatusBar(); this.SuspendLayout(); // // label1 // this.label1.Location = new System.Drawing.Point(8, 24); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(96, 23); this.label1.TabIndex = 0; this.label1.Text = "下载文件的URI:"; // // label2 // this.label2.Location = new System.Drawing.Point(16, 64); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(88, 23); this.label2.TabIndex = 1; this.label2.Text = "本地保存路径:"; // // txtURI // this.txtURI.Location = new System.Drawing.Point(112, 25); this.txtURI.Name = "txtURI"; this.txtURI.Size = new System.Drawing.Size(208, 21); this.txtURI.TabIndex = 2; this.txtURI.Text = ""; // // txtPath // this.txtPath.Location = new System.Drawing.Point(112, 65); this.txtPath.Name = "txtPath"; this.txtPath.Size = new System.Drawing.Size(208, 21); this.txtPath.TabIndex = 3; this.txtPath.Text = ""; // // btnSelect // this.btnSelect.Location = new System.Drawing.Point(328, 64); this.btnSelect.Name = "btnSelect"; this.btnSelect.TabIndex = 4; this.btnSelect.Text = "选择路径..."; this.btnSelect.Click += new System.EventHandler(this.btnSelect_Click); // // btnDownLoad // this.btnDownLoad.Location = new System.Drawing.Point(112, 104); this.btnDownLoad.Name = "btnDownLoad"; this.btnDownLoad.TabIndex = 5; this.btnDownLoad.Text = "下载"; this.btnDownLoad.Click += new System.EventHandler(this.btnDownLoad_Click); // // stBar // this.stBar.Location = new System.Drawing.Point(0, 184); this.stBar.Name = "stBar"; this.stBar.Size = new System.Drawing.Size(424, 22); this.stBar.TabIndex = 6; // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(424, 206); this.Controls.Add(this.stBar); this.Controls.Add(this.btnDownLoad); this.Controls.Add(this.btnSelect); this.Controls.Add(this.txtPath); this.Controls.Add(this.txtURI); this.Controls.Add(this.label2); this.Controls.Add(this.label1); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false);
} #endregion
/// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.Run(new Form1()); }
private void btnSelect_Click(object sender, System.EventArgs e) { if(folderBD.ShowDialog()==DialogResult.Cancel) { return; } txtPath.Text=folderBD.SelectedPath; }
private void btnDownLoad_Click(object sender, System.EventArgs e) { //开启线程,以改善用户体验. Thread th=new Thread(new ThreadStart(StartDownLoad)); //th.Name="New DownLoad"; th.Start(); } private void StartDownLoad() { string url=string.Empty; string fileName=string.Empty; int n=0; string path=string.Empty;
btnDownLoad.Enabled=false; url=txtURI.Text; n=url.LastIndexOf('/'); fileName=url.Substring(n+1); path=txtPath.Text+"\\"+fileName;
try { WebRequest request=WebRequest.Create(url); } catch(WebException ex) { MessageBox.Show(ex.Message,"Error"); }
try { stBar.Text="开始下载文件..."; client.DownloadFile(url,path); stBar.Text="下载完毕,文件已经保存到"+path.ToString(); } catch(WebException ex) { MessageBox.Show(ex.Message,"Error"); stBar.Text=string.Empty; } finally { btnDownLoad.Enabled=true; } } } }
</xmp> 
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