文本搜索器

本例创建一个文本搜索器，它能在指定目录下指定类型文件中搜索指定的文本，程序界面如下图。

程序代码如下。

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Security;
namespace eg47_findApp
{
	public partial class MainForm : Form
	{
		ArrayList m_arrFiles=new ArrayList();
		public MainForm()
		{
			InitializeComponent();
		}
		
		void BtnBrowseClick(object sender, EventArgs e)
		{
			OpenFileDialog fdlg=new OpenFileDialog();
			fdlg.Title="Select a file";
			fdlg.Filter="All filter(*.*)|*.*";
			if(fdlg.ShowDialog()==DialogResult.OK)
			{
				string strPath=fdlg.FileName;
				string strExt;
				FileInfo f=new FileInfo(strPath);
				txtDir.Text=f.DirectoryName;
				strExt=f.Extension;
				if(strExt!="")
					strExt=strExt.Substring(1);
				txtFiles.Text=strExt;
			}
		}
		void BtnSearchClick(object sender, EventArgs e)
		{
			Search();
		}
		protected void Search()
		{
			string strDir=txtDir.Text;
			DirectoryInfo dir=new DirectoryInfo(strDir);
			if(!dir.Exists)
				MessageBox.Show("Directory doesn't exist!","Win Grep Erro");
			else
			{
				Text="文件内内容搜索器"+strDir;
				Cursor=System.Windows.Forms.Cursor.Current;
				string strExt=txtFiles.Text;
				if(strExt!="")
					if(strExt.StartsWith("."))
				{
					strExt=strExt.Substring(1);
				}
				m_arrFiles.Clear();
				GetFiles(strDir,strExt,ckInclude.Checked);
				string strSearch=txtSearchtext.Text;
				string strResults="";
				string strLine;
				int iLine;
				IEnumerator enm=m_arrFiles.GetEnumerator();
				while(enm.MoveNext())
				{
					try
					{
						StreamReader sr=File.OpenText((string)enm.Current);
						iLine=0;
						string strResultsInThisFile="";
						while((strLine=sr.ReadLine())!=null)
						{
							iLine++;
							if(strLine.IndexOf(strSearch)!=-1)
							{
								strResultsInThisFile+=""+iLine+":"+strLine+"\r\n";
							}
						}
						sr.Close();
						if(chkNotListAll.Checked)
						{
							if(strResultsInThisFile.Length>0)
							{
								strResults+="\r\n"+(string)enm.Current+":\r\n";
								strResults+=strResultsInThisFile;
							}
						}
						else
						{
							strResults+="\r\n"+(string)enm.Current+"\r\n";
							strResults+=strResultsInThisFile;
						}
					}
					catch(SecurityException)
					{
						strResults+="\r\n|"+(string)enm.Current+":Security exception\r\n\r\n";
					}
				}
				txtResults.Text=strResults;
				Cursor=System.Windows.Forms.Cursors.Arrow;
			}
		}
		protected void GetFiles(string strDir,string strExt,bool bRecursive)
		{
			DirectoryInfo dir=new DirectoryInfo(strDir);
			FileInfo[]fileList=dir.GetFiles("*."+strExt);
			for(int i=0;i<fileList.Length;i++)
			{
				if(fileList[i].Exists)
				{
					m_arrFiles.Add(strDir+"\\"+fileList[i].Name);
				}

			}
			if(bRecursive==true)
				{
					DirectoryInfo[]dirList=dir.GetDirectories();
					for(int i=0;i<dirList.Length;i++)
					{
						GetFiles(strDir+"\\"+dirList[i].Name,strExt,bRecursive);
					}
				}
		}
		void TxtFilesKeyDown(object sender, KeyEventArgs e)
		{
			if(e.KeyCode==Keys.Enter&&btnSearch.Enabled==true)
			{
				Search();
			}
		}
		void TxtDirKeyDown(object sender, KeyEventArgs e)
		{
			if(e.KeyCode==Keys.Enter&&btnSearch.Enabled==true)
			{
				Search();
			}
		}
		void TxtSearchtextKeyDown(object sender, KeyEventArgs e)
		{
			if(e.KeyCode==Keys.Enter&&btnSearch.Enabled==true)
			{
				Search();
			}
		}
		void TxtDirTextChanged(object sender, EventArgs e)
		{
			VerifySearchBtn();
		}
		protected void VerifySearchBtn()
		{
			if(txtDir.Text!=""&&txtSearchtext.Text!="")
			{
				btnSearch.Enabled=true;
			}
			else
				btnSearch.Enabled=false;
		}
		void TxtSearchtextTextChanged(object sender, EventArgs e)
		{
			VerifySearchBtn();
		}
	}
}