C# 实现文件锁

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;namespace FileTokenNotWork{    public partial class Form1 : Form    {        FileStream fs = null;        int count = 0;        public Form1()        {            InitializeComponent();        }        private void btnUpdate_Click(object sender, EventArgs e)        {            OpenFileDialog ofd = new OpenFileDialog();            ofd.ShowDialog();            filedirtectory.Text = ofd.FileName;        }        private void button1_Click(object sender, EventArgs e)        {            count++;            if (count > 1)            {                MessageBox.Show("Do not do it again.","Warning",MessageBoxButtons.OK,MessageBoxIcon.Warning);                return;            }            try            {                if (string.IsNullOrEmpty(filedirtectory.Text))                {                    MessageBox.Show("Not have the file", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Error);                    count--;                    return;                }                fs = new FileStream(filedirtectory.Text, FileMode.Open, FileAccess.Read, FileShare.None);            }            catch (Exception)            {                fs.Close();            }        }        private void button2_Click(object sender, EventArgs e)        {            count--;            fs.Close();        }    }}

 

namespace FileTokenNotWork{    partial class Form1    {        /// <summary>        /// Required designer variable.        /// </summary>        private System.ComponentModel.IContainer components = null;        /// <summary>        /// Clean up any resources being used.        /// </summary>        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>        protected override void Dispose(bool disposing)        {            if (disposing && (components != null))            {                components.Dispose();            }            base.Dispose(disposing);        }        #region Windows Form Designer generated code        /// <summary>        /// Required method for Designer support - do not modify        /// the contents of this method with the code editor.        /// </summary>        private void InitializeComponent()        {            this.btnUpdate = new System.Windows.Forms.Button();            this.openFileDialog = new System.Windows.Forms.OpenFileDialog();            this.filedirtectory = new System.Windows.Forms.TextBox();            this.groupBox1 = new System.Windows.Forms.GroupBox();            this.groupBox2 = new System.Windows.Forms.GroupBox();            this.button1 = new System.Windows.Forms.Button();            this.button2 = new System.Windows.Forms.Button();            this.groupBox1.SuspendLayout();            this.groupBox2.SuspendLayout();            this.SuspendLayout();            //             // btnUpdate            //             this.btnUpdate.Location = new System.Drawing.Point(175, 20);            this.btnUpdate.Name = "btnUpdate";            this.btnUpdate.Size = new System.Drawing.Size(75, 23);            this.btnUpdate.TabIndex = 0;            this.btnUpdate.Text = "submit";            this.btnUpdate.UseVisualStyleBackColor = true;            this.btnUpdate.Click += new System.EventHandler(this.btnUpdate_Click);            //             // openFileDialog            //             this.openFileDialog.FileName = "openFileDialog";            //             // filedirtectory            //             this.filedirtectory.Location = new System.Drawing.Point(18, 22);            this.filedirtectory.Name = "filedirtectory";            this.filedirtectory.Size = new System.Drawing.Size(134, 21);            this.filedirtectory.TabIndex = 1;            //             // groupBox1            //             this.groupBox1.Controls.Add(this.filedirtectory);            this.groupBox1.Controls.Add(this.btnUpdate);            this.groupBox1.Location = new System.Drawing.Point(12, 12);            this.groupBox1.Name = "groupBox1";            this.groupBox1.Size = new System.Drawing.Size(268, 65);            this.groupBox1.TabIndex = 2;            this.groupBox1.TabStop = false;            this.groupBox1.Text = "Find file directory";            //             // groupBox2            //             this.groupBox2.Controls.Add(this.button2);            this.groupBox2.Controls.Add(this.button1);            this.groupBox2.Location = new System.Drawing.Point(12, 97);            this.groupBox2.Name = "groupBox2";            this.groupBox2.Size = new System.Drawing.Size(268, 98);            this.groupBox2.TabIndex = 3;            this.groupBox2.TabStop = false;            this.groupBox2.Text = "lock file";            //             // button1            //             this.button1.Location = new System.Drawing.Point(28, 37);            this.button1.Name = "button1";            this.button1.Size = new System.Drawing.Size(75, 23);            this.button1.TabIndex = 0;            this.button1.Text = "lock";            this.button1.UseVisualStyleBackColor = true;            this.button1.Click += new System.EventHandler(this.button1_Click);            //             // button2            //             this.button2.Location = new System.Drawing.Point(144, 37);            this.button2.Name = "button2";            this.button2.Size = new System.Drawing.Size(75, 23);            this.button2.TabIndex = 1;            this.button2.Text = "release";            this.button2.UseVisualStyleBackColor = true;            this.button2.Click += new System.EventHandler(this.button2_Click);            //             // Form1            //             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;            this.ClientSize = new System.Drawing.Size(290, 204);            this.Controls.Add(this.groupBox2);            this.Controls.Add(this.groupBox1);            this.Name = "Form1";            this.Text = "LockFileTool";            this.groupBox1.ResumeLayout(false);            this.groupBox1.PerformLayout();            this.groupBox2.ResumeLayout(false);            this.ResumeLayout(false);        }        #endregion        private System.Windows.Forms.Button btnUpdate;        private System.Windows.Forms.OpenFileDialog openFileDialog;        private System.Windows.Forms.TextBox filedirtectory;        private System.Windows.Forms.GroupBox groupBox1;        private System.Windows.Forms.GroupBox groupBox2;        private System.Windows.Forms.Button button2;        private System.Windows.Forms.Button button1;    }}

 

----转载自http://chenhailong.iteye.com/blog/1138711 对此深表感谢。