C#如何实现文件传送

这篇文章给大家分享的是有关C#如何实现文件传送的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。

C#文件传送使用较为频繁的场景，是即时聊天工具中的文件传输。比如点对点方面的传送。在一般情况下，C#文件传送都要对通信端口，连接的控制，异常的控制等做好准备。

这个C#文件传送程序是借鉴TcpFileTransferDemo项目的来的。C#文件传送源码很少，还有改进的地方就是可以用多线程进行大文件传送。

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.Net.Sockets;  using System.Threading;    namespace CSharpData  {   ///   /// SaveFileForm 的摘要说明。   ///   public class SaveFileForm : System.Windows.Forms.Form   {    private System.Windows.Forms.Panel panel1;    private System.Windows.Forms.TextBox textBox2;    private System.Windows.Forms.Label label2;    private System.Windows.Forms.TextBox textBox1;    private System.Windows.Forms.Label label1;    private System.Windows.Forms.Button button4;    private System.Windows.Forms.Button button3;    private System.Windows.Forms.Button button2;    private System.Windows.Forms.Button button1;    private System.Windows.Forms.StatusBar statusBar1;    ///    /// 必需的设计器变量。    ///    private System.ComponentModel.Container components = null;          public SaveFileForm()    {     //     // Windows 窗体设计器支持所必需的     //     InitializeComponent();      setStatusDelegate = new SetStatusDelegate(SetStatus);     getSaveFileDelegate = new GetSaveFileDelegate(GetSaveFile);     //     // TODO: 在 InitializeComponent 调用后添加任何构造函数代码     //    }     ///    /// 清理所有正在使用的资源。    ///    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    ///    /// 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。    ///    private void InitializeComponent()    {     this.panel1 = new System.Windows.Forms.Panel();     this.textBox2 = new System.Windows.Forms.TextBox();     this.label2 = new System.Windows.Forms.Label();     this.textBox1 = new System.Windows.Forms.TextBox();     this.label1 = new System.Windows.Forms.Label();     this.button4 = new System.Windows.Forms.Button();     this.button3 = new System.Windows.Forms.Button();     this.button2 = new System.Windows.Forms.Button();     this.button1 = new System.Windows.Forms.Button();     this.statusBar1 = new System.Windows.Forms.StatusBar();     this.panel1.SuspendLayout();     this.SuspendLayout();     //      // panel1     //      this.panel1.Controls.Add(this.textBox2);     this.panel1.Controls.Add(this.label2);     this.panel1.Controls.Add(this.textBox1);     this.panel1.Controls.Add(this.label1);     this.panel1.Controls.Add(this.button4);     this.panel1.Controls.Add(this.button3);     this.panel1.Controls.Add(this.button2);     this.panel1.Controls.Add(this.button1);     this.panel1.Location = new System.Drawing.Point(8, 16);     this.panel1.Name = "panel1";     this.panel1.Size = new System.Drawing.Size(272, 152);     this.panel1.TabIndex = 0;     //      // textBox2     //      this.textBox2.Location = new System.Drawing.Point(96, 64);     this.textBox2.Name = "textBox2";     this.textBox2.TabIndex = 15;     this.textBox2.Text = "800";     //      // label2     //      this.label2.Location = new System.Drawing.Point(8, 72);     this.label2.Name = "label2";     this.label2.Size = new System.Drawing.Size(80, 16);     this.label2.TabIndex = 14;     this.label2.Text = "通信端口";     //      // textBox1     //      this.textBox1.Location = new System.Drawing.Point(96, 24);     this.textBox1.Name = "textBox1";     this.textBox1.TabIndex = 13;     this.textBox1.Text = "192.168.1.250";     //      // label1     //      this.label1.Location = new System.Drawing.Point(8, 32);     this.label1.Name = "label1";     this.label1.Size = new System.Drawing.Size(80, 16);     this.label1.TabIndex = 12;     this.label1.Text = "IP地址";     //      // button4     //      this.button4.Location = new System.Drawing.Point(160, 104);     this.button4.Name = "button4";     this.button4.Size = new System.Drawing.Size(64, 23);     this.button4.TabIndex = 11;     this.button4.Text = "接收文件";     this.button4.Click += new System.EventHandler(this.button4_Click);     //      // button3     //      this.button3.Location = new System.Drawing.Point(56, 104);     this.button3.Name = "button3";     this.button3.Size = new System.Drawing.Size(64, 23);     this.button3.TabIndex = 10;     this.button3.Text = "发送文件";     this.button3.Click += new System.EventHandler(this.button3_Click);     //      // button2     //      this.button2.Location = new System.Drawing.Point(200, 64);     this.button2.Name = "button2";     this.button2.Size = new System.Drawing.Size(64, 23);     this.button2.TabIndex = 9;     this.button2.Text = "停止监听";     this.button2.Click += new System.EventHandler(this.button2_Click);     //      // button1     //      this.button1.Location = new System.Drawing.Point(200, 24);     this.button1.Name = "button1";     this.button1.Size = new System.Drawing.Size(64, 23);     this.button1.TabIndex = 8;     this.button1.Text = "开始监听";     this.button1.Click += new System.EventHandler(this.button1_Click);     //      // statusBar1     //      this.statusBar1.Location = new System.Drawing.Point(0, 191);     this.statusBar1.Name = "statusBar1";     this.statusBar1.Size = new System.Drawing.Size(292, 22);     this.statusBar1.TabIndex = 1;     this.statusBar1.Text = "statusBar1";     //      // SaveFileForm     //      this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);     this.ClientSize = new System.Drawing.Size(292, 213);     this.Controls.Add(this.statusBar1);     this.Controls.Add(this.panel1);     this.Name = "SaveFileForm";     this.Text = "局域网内接收文件";     this.panel1.ResumeLayout(false);     this.ResumeLayout(false);     }    #endregion     private void button1_Click(object sender, System.EventArgs e)    {     port = 0;     try    {      port = int.Parse(textBox2.Text);      if (port < 1 || port > 65535) throw new ArgumentOutOfRangeException();     }     catch    {      MessageBox.Show("请输入有效的端口号。");      textBox2.Focus();      textBox2.SelectAll();      return;     }     button1.Enabled = false;     button2.Enabled = true;     worker = new Thread(new ThreadStart(Start));     worker.IsBackground = true;     worker.Start();    }     private void button2_Click(object sender, System.EventArgs e)    {     try { worker.Abort(); }     catch {}    }     private void button3_Click(object sender, System.EventArgs e)    {        }     private void button4_Click(object sender, System.EventArgs e)    {        }     #region 程序逻辑    private Thread worker;    private int port;     private void Start()    {     try // 捕获线程中止异常     {      SetStatus("开始侦听端口");      TcpListener tcpListener = new TcpListener(IPAddress.Any, port);      try // 捕获开始侦听时出现的错误，例如端口已被占用      {       tcpListener.Start();      }      catch (Exception e)      {       SetStatus("侦听端口出错：" + e.Message);       InvokeCancel();       return;      }      try // 确保停止侦听      {       SetStatus("等待传入连接中");       while (true) // 一直循环，直到线程被中止。但每次只处理一个连接       {        // 没有等待传入的连接就一直等待。不使用异步模型以提高程序可读性        while (!tcpListener.Pending())         Thread.Sleep(100);         TcpClient tcpClient = tcpListener.AcceptTcpClient();        tcpClient.NoDelay = true;        tcpClient.ReceiveTimeout = 30000;        BinaryReader reader = new BinaryReader(tcpClient.GetStream());         try // 捕获文件传输中途出现的错误，并确保关闭连接        {         string filename = reader.ReadString();         long total = reader.ReadInt64();         SetStatus("收到文件传输请求，文件名 " + filename +          "，大小 " + total.ToString() + " 字节");          string saveAs = GetSaveFile(filename);         if (saveAs == null)         {          SetStatus("操作已取消。等待下一连接中");          // finally 段会帮忙关闭连接         }         else        {          SetStatus("接收文件中");          FileStream fs = File.Create(saveAs);          try         {           byte[] buffer = new byte[8192];           int len;           while (total > 0)           {            len = reader.Read(buffer, 0, 8192);            if (len == 0)             throw new IOException("发送方中止了连接");            fs.Write(buffer, 0, len);            SetStatus("接收文件中 - 剩余 " +             (total -= len).ToString() + " 字节");           }           SetStatus("文件已保存至 " + saveAs +            "。等待下一连接中");          }          finally         {           fs.Close();          }         }        }        catch (Exception e)        {         SetStatus("文件传输中途出错：" + e.Message);         InvokeCancel();        }        finally       {         try { reader.Close(); }         catch {}         try { tcpClient.Close(); }         catch {}        }       }      }      finally     {       tcpListener.Stop();      }     }     catch (ThreadAbortException)     {      SetStatus("用户中断");      InvokeCancel();     }     finally    {      worker = null;     }    }    #endregion     #region 线程安全UI操作代码    private delegate void SetStatusDelegate(string status);    private SetStatusDelegate setStatusDelegate; // 赋值在构造函数里     private void SetStatus(string status)    {     if (InvokeRequired)      Invoke(setStatusDelegate, new object[] { status });     else     statusBar1.Text = status;    }     private void InvokeCancel()    {     if (InvokeRequired)      Invoke(new MethodInvoker(InvokeCancel));     else    {      button2.Enabled = false;      button1.Enabled = true;     }    }     private delegate string GetSaveFileDelegate(string filename);    private GetSaveFileDelegate getSaveFileDelegate; //        private string GetSaveFile(string filename)    {     if (InvokeRequired)      return (string)Invoke(getSaveFileDelegate, new object[] { filename });     else    {      //打开要发送的文件      SaveFileDialog sfd = new SaveFileDialog();      sfd.FileName = filename;      if (sfd.ShowDialog(this) == DialogResult.OK)       return sfd.FileName;      else      return null;     }    }    #endregion   }  }

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