正则查询文件内容

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;
using System.Text.RegularExpressions;
namespace 文件内容搜索
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private string path;
        private string regx;

        private void button1_Click(object sender, EventArgs e)
        {
            textBox3.Text = "";
            path = textBox1.Text;
            regx = textBox2.Text;
            if (string.IsNullOrEmpty(path) || string.IsNullOrEmpty(regx))
            {
                MessageBox.Show("不能为空");
                return;
            }
            if (!File.Exists(path)&&!Directory.Exists(path))
            {
                MessageBox.Show("文件不存在");
            }
            else if (Directory.Exists(path))
            {
                Find(path, textBox3);
            }
            else
            {
                FindInFile(new FileInfo(path), textBox3);
            }
            

        }

        public void Find(string currPath, TextBox show)
        {
            DirectoryInfo dir = new DirectoryInfo(currPath);
            DirectoryInfo[] dirs = dir.GetDirectories();
            FileInfo[] fis = dir.GetFiles();
            foreach(DirectoryInfo d in dirs)
            {
                Find(d.FullName,show);
            }
            foreach (FileInfo f in fis)
            {
                FindInFile(f, show);
            }
        }

        public void FindInFile(FileInfo f, TextBox show)
        {
            Regex re = new Regex(regx, RegexOptions.None);
            string filePath = f.FullName;
            int lineNum = 0;
            StreamReader sr = f.OpenText();
            while (!sr.EndOfStream)
            {
                lineNum++;
                string line = sr.ReadLine();
                if(re.Matches(line).Count>0)
                {
                    show.Text += filePath + "  行：" + lineNum+"\r\n";
                }
            }
        }
        
    }
}

namespace 文件内容搜索
{
    partial class Form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (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.textBox1 = new System.Windows.Forms.TextBox();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.textBox3 = new System.Windows.Forms.TextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(32, 26);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(41, 12);
            this.label1.TabIndex = 0;
            this.label1.Text = "根路径";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(34, 54);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(41, 12);
            this.label2.TabIndex = 1;
            this.label2.Text = "正则式";
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(105, 26);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(206, 21);
            this.textBox1.TabIndex = 2;
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(105, 54);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(206, 21);
            this.textBox2.TabIndex = 3;
            // 
            // textBox3
            // 
            this.textBox3.Location = new System.Drawing.Point(36, 110);
            this.textBox3.Multiline = true;
            this.textBox3.Name = "textBox3";
            this.textBox3.ReadOnly = true;
            this.textBox3.ScrollBars = System.Windows.Forms.ScrollBars.Both;
            this.textBox3.ShortcutsEnabled = false;
            this.textBox3.Size = new System.Drawing.Size(275, 113);
            this.textBox3.TabIndex = 4;
            this.textBox3.WordWrap = false;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(236, 81);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 6;
            this.button1.Text = "搜索";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // Form1
            // 
            this.AcceptButton = this.button1;
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(353, 248);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.textBox3);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Name = "Form1";
            this.Text = "文件内容搜索";
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.TextBox textBox3;
        private System.Windows.Forms.Button button1;
    }
}

主要的代码就这些了