C# winfrom 写的一个搜索助手，可以按照标题和内容搜索，支持doc,xls,ppt,pdf,txt等格式的文件搜索

C# winfrom 写的一个搜索助手，可以按照标题和内容搜索，指定目录后，遍历搜索文件和子目，现在只写了支持.DOC.DOCX.XLS.XLSX.PPT.PPTX.PDF.HTML.HTM.TXT等格式的文件搜索，读取execl 内容使用的是NPOI组件，doc,html,txt 格式的使用StreamReader 流文件读取方式，ppt,pdf使用的Spire组件。

直接上代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Threading;
using System.Security.AccessControl;
using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;
using NPOI.XSSF.UserModel;
using Spire.Presentation;
using Spire.Pdf;

namespace Search
{
    public partial class formMain : Form
    {
        public formMain()
        {
            InitializeComponent();
        }
        //选择文件路径
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                FolderBrowserDialog dialog = new FolderBrowserDialog();
                dialog.Description = "请选择文件路径";
                if (dialog.ShowDialog() == DialogResult.OK)
                {
                    string foldPath = dialog.SelectedPath;
                    textBox1.Text = foldPath;
                    //把选择路径存储在注册表
                    Application.UserAppDataRegistry.SetValue("ZMJASearchPath", foldPath);
                }
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
           try
            {
                string foldPath = textBox1.Text;
                if (string.IsNullOrEmpty(foldPath))
                {
                    MessageBox.Show("请选择文件路径！");
                    return;
                }
                string searckkey = textBox2.Text;
                if (string.IsNullOrEmpty(searckkey))
                {
                    MessageBox.Show("请输入搜索关键字！");
                    return;
                }
                string extension = comboBox1.Text;
                if (!string.IsNullOrEmpty(extension))
                {
                    extension = extension.ToUpper();
                    switch (extension)
                    {
                        case ".HTML":
                            extension = ".HTML.HTM";
                            break;
                        case ".DOC":
                            extension = ".DOC.DOCX";
                            break;
                        case ".XLS":
                            extension = ".XLS.XLSX";
                            break;
                        case ".PPT":
                            extension = ".PPT.PPTX";
                            break;
                        default:
                            break;
                    }
                }
                else {
                    extension = ".DOC.DOCX.XLS.XLSX.PPT.PPTX.PDF.HTML.HTM.TXT";
                }
                dataGridView1.Rows.Clear();
                listDirectory(@foldPath, extension, comboBox2.Text, searckkey);

                lbmessage.Text = "";
                MessageBox.Show("搜索完毕");
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }

         /// <summary>
         /// 列出path路径对应的文件夹中的子文件夹和文件
         /// 然后再递归列出子文件夹内的文件和文件夹
         /// </summary>
         /// <param name="path">需要搜索文件夹的路径</param>
         public void listDirectory(string path,string extension, string coding,string searckkey)
         {
             DirectoryInfo theFolder = new DirectoryInfo(@path);
             DirectorySecurity s = new DirectorySecurity(path, AccessControlSections.Access);
            //判断目录是否 可以访问  
            if (!s.AreAccessRulesProtected)
            {

                foreach (FileInfo file in theFolder.GetFiles())
                {
                    if (string.IsNullOrEmpty(extension) || extension.Contains(file.Extension.ToUpper()))
                    {
                        lbmessage.Text = "正在搜索文件：" + path + "\" + file.Name;
                        Application.DoEvents();

                        #region 仅检索标题
                        if (comboBox3.Text == "仅标题")
                        {
                            if (file.Name.Contains(searckkey))
                            {
                                int index = this.dataGridView1.Rows.Add();
                                this.dataGridView1.Rows[index].Cells[0].Value = index + 1;
                                this.dataGridView1.Rows[index].Cells[1].Value = file.Name;
                                this.dataGridView1.Rows[index].Cells[2].Value = path + "\" + file.Name;
                                break;
                            }
                        }
                        #endregion

                        #region 标题和内容都检索
                        else
                        {
                            #region 检索判断标题
                            //默认检索 先搜索标题是否有，如果有，则退出循环，如果没有，再检索内容
                            if (file.Name.Contains(searckkey))
                            {
                                int index = this.dataGridView1.Rows.Add();
                                this.dataGridView1.Rows[index].Cells[0].Value = index + 1;
                                this.dataGridView1.Rows[index].Cells[1].Value = file.Name;
                                this.dataGridView1.Rows[index].Cells[2].Value = path + "\" + file.Name;
                                break;
                            }
                            #endregion 

                            using (FileStream fs = new FileStream(path + "\" + file.Name, FileMode.Open, FileAccess.Read))
                            {
                                #region 读取Execl

                                if (file.Extension.ToUpper().Contains(".XLS"))
                                {
                                    try
                                    {
                                        IWorkbook workbook = null;//全局workbook
                                        ISheet sheet;//sheet
                                        switch (file.Extension)
                                        {
                                            //xls是03，用HSSFWorkbook打开，.xlsx是07或者10用XSSFWorkbook打开
                                            case ".xls": workbook = new HSSFWorkbook(fs); break;
                                            case ".xlsx": workbook = new XSSFWorkbook(fs); break;
                                            default: break;
                                        }
                                        fs.Close();//关闭文件流
                                        if (workbook != null)
                                        {
                                            int count = workbook.NumberOfSheets;
                                            bool bo = false; //bo初始化为假
                                            for (int index = 0; index < count; index++)
                                            {
                                                if (bo)//如果bo为真
                                                    break;//退出第一层循环
                                                sheet = workbook.GetSheetAt(index);//读取到指定的sheet
                                                                                   //遍历读取cell
                                                for (int i = sheet.FirstRowNum; i <= sheet.LastRowNum; i++)
                                                {
                                                    if (bo)//如果bo为真
                                                        break;//退出第二层循环
                                                    IRow row = sheet.GetRow(i);//得到一行
                                                    if (row != null)
                                                    {
                                                        for (int j = row.FirstCellNum; j < row.LastCellNum; j++)
                                                        {
                                                            ICell cell = row.GetCell(j);//得到cell
                                                            if (cell != null)//如果cell为null，则赋值为空
                                                            {
                                                                if (row.GetCell(j).ToString().Contains(searckkey))
                                                                {
                                                                    int GridIndex = this.dataGridView1.Rows.Add();
                                                                    this.dataGridView1.Rows[GridIndex].Cells[0].Value = GridIndex + 1;
                                                                    this.dataGridView1.Rows[GridIndex].Cells[1].Value = file.Name;
                                                                    this.dataGridView1.Rows[GridIndex].Cells[2].Value = path + "\" + file.Name;
                                                                    bo = true;//bo赋为真
                                                                    break;//退出第三层循环
                                                                }
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                        //释放资源
                                        workbook = null;
                                        sheet = null;
                                    }
                                    catch (Exception err)
                                    {
                                        //MessageBox.Show(err.Message);
                                    }
                                }
                                #endregion

                                #region 读取ppt内容
                                else if (file.Extension.ToUpper().Contains(".PPT"))
                                {
                                    try
                                    {
                                        //初始化一个Presentation类实例，并加载文档
                                        Presentation ppt = new Presentation();
                                        ppt.LoadFromFile(path + "\" + file.Name);
                                        bool bo = false;
                                        foreach (ISlide slide in ppt.Slides)
                                        {
                                            if (bo)//如果bo为真
                                                break;//退出第一层循环
                                            foreach (Spire.Presentation.IShape shape in slide.Shapes)
                                            {
                                                if (bo)//如果bo为真
                                                    break;//退出第一层循环
                                                if (shape is IAutoShape)
                                                {
                                                    foreach (TextParagraph tp in (shape as IAutoShape).TextFrame.Paragraphs)
                                                    {
                                                        if (tp.Text.Contains(searckkey))
                                                        {
                                                            int GridIndex = this.dataGridView1.Rows.Add();
                                                            this.dataGridView1.Rows[GridIndex].Cells[0].Value = GridIndex + 1;
                                                            this.dataGridView1.Rows[GridIndex].Cells[1].Value = file.Name;
                                                            this.dataGridView1.Rows[GridIndex].Cells[2].Value = path + "\" + file.Name;
                                                            bo = true;//bo赋为真
                                                            break;//退出第三层循环
                                                        }
                                                    }
                                                }

                                            }
                                        }
                                        ppt = null; //释放资源
                                    }
                                    catch (Exception err)
                                    {
                                        //MessageBox.Show(err.Message);
                                    }
                                }
                                #endregion

                                #region 读取pdf文件
                                else if (file.Extension.ToUpper().Contains(".PDF")) {
                                    try
                                    {
                                        PdfDocument pdf= new PdfDocument();
                                        pdf.LoadFromFile(@path + "\" + file.Name);
                                        foreach (PdfPageBase page in pdf.Pages)
                                        {
                                            string content = page.ExtractText();
                                            if (content.Contains(searckkey)) {
                                                int GridIndex = this.dataGridView1.Rows.Add();
                                                this.dataGridView1.Rows[GridIndex].Cells[0].Value = GridIndex + 1;
                                                this.dataGridView1.Rows[GridIndex].Cells[1].Value = file.Name;
                                                this.dataGridView1.Rows[GridIndex].Cells[2].Value = path + "\" + file.Name;
                                                break;
                                            }
                                        }
                                        pdf = null;//释放资源
                                    }
                                    catch (Exception err) {

                                    }
                                }
                                #endregion

                                #region 读取其他文本文件
                                else
                                {
                                    Encoding codingType = Encoding.Default;
                                    if (!string.IsNullOrEmpty(coding))
                                    {
                                        codingType = Encoding.GetEncoding(coding.ToUpper());
                                    }
                                    else
                                    {
                                        codingType = common.GetType(path + "\" + file.Name);
                                    }
                                    StreamReader sr = new StreamReader(fs, codingType);
                                    String str;
                                    while ((str = sr.ReadLine()) != null)
                                    {
                                        if (str.Contains(searckkey))
                                        {
                                            int index = this.dataGridView1.Rows.Add();
                                            this.dataGridView1.Rows[index].Cells[0].Value = index + 1;
                                            this.dataGridView1.Rows[index].Cells[1].Value = file.Name;
                                            this.dataGridView1.Rows[index].Cells[2].Value = path + "\" + file.Name;
                                            sr.Close();
                                            fs.Close();
                                            break;
                                        }
                                    }
                                }
                                #endregion

                            }
                        }

                        #endregion
                    }
                }
            }
             //遍历文件夹
             foreach (DirectoryInfo NextFolder in theFolder.GetDirectories())
             {
                if ((NextFolder.Attributes & FileAttributes.Hidden) != FileAttributes.Hidden) {
                    listDirectory(NextFolder.FullName,extension, coding,searckkey);
                }
            }
         }

        private void OpenFolderAndSelectFile(String fileFullName)
        {
            System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo("Explorer.exe");
            psi.Arguments = "/e,/select," + fileFullName;
            System.Diagnostics.Process.Start(psi);
        }
        private void dataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
        {

        }
        //删除文件，这里是一个伪删除了，直接把文件移动到deleteData文件夹中，如果需要删除手动删除
        private void button3_Click(object sender, EventArgs e)
        { 
            try
            {
                int count = 0;
                int totalCount = dataGridView1.RowCount;
                string foldPath = textBox1.Text;
                string filderPath = @foldPath + "\DeleteData";
                string fileName = "";
                if (Directory.Exists(filderPath) == false)
                {
                    //如果不存
                    Directory.CreateDirectory(filderPath);
                }
                for (int i = 0; i < dataGridView1.RowCount; i++)
                {
                    lbmessage.Text = "正在删除文件：" + dataGridView1.Rows[i].Cells[2].Value.ToString();
                    Application.DoEvents();
                    count += 1;
                    fileName = dataGridView1.Rows[i].Cells[1].Value.ToString();
                    File.Move(dataGridView1.Rows[i].Cells[2].Value.ToString(), filderPath + "\" + fileName);
                }
                dataGridView1.Rows.Clear();
                lbmessage.Text = "";
                MessageBox.Show("删除完毕");
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
            finally {
                lbmessage.Text = "";
            }
        }

        //清空列表
        private void button4_Click(object sender, EventArgs e)
        {
            dataGridView1.Rows.Clear();
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            string extension = comboBox1.Text;
            if (!string.IsNullOrEmpty(extension))
            {
                extension = extension.ToUpper();
                switch (extension)
                {
                    case ".HTML":
                        comboBox2.SelectedIndex = comboBox2.Items.IndexOf("UTF-8");
                        break;
                    case ".DOC":
                        comboBox2.SelectedIndex = comboBox2.Items.IndexOf("Unicode");
                        break;
                    default:
                       
                        break;
                }
            }
        }

        //默认加载
        private void formMain_Load(object sender, EventArgs e)
        {
            //默认是全部搜索模式
            comboBox3.SelectedText = "全部";
            //从注册表把选择路径读取出来
            textBox1.Text = Application.UserAppDataRegistry.GetValue("ZMJASearchPath") as string;
        }

        //双击单元格打开文件所在位置
        private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            try
            {
                if (e.ColumnIndex < 0 || e.RowIndex < 0)
                {
                    MessageBox.Show("请选择要打开的文件");
                    return;
                }
                int index = dataGridView1.CurrentCell.RowIndex;
                System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo("Explorer.exe");
                psi.Arguments = "/e,/select," + dataGridView1.Rows[index].Cells[2].Value.ToString();
                System.Diagnostics.Process.Start(psi);
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }
        //右键快捷菜单打开文件所在位置
        private void 打开文件所在位置ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                if (dataGridView1.CurrentRow == null)
                {
                    MessageBox.Show("请选择要打开的文件");
                    return;
                }
                int index = dataGridView1.CurrentCell.RowIndex;
                System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo("Explorer.exe");
                psi.Arguments = "/e,/select," + dataGridView1.Rows[index].Cells[2].Value.ToString();
                System.Diagnostics.Process.Start(psi);
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }

        //双击文本框选择路径
        private void textBox1_DoubleClick(object sender, EventArgs e)
        {
            try
            {
                FolderBrowserDialog dialog = new FolderBrowserDialog();
                dialog.Description = "请选择文件路径";
                if (dialog.ShowDialog() == DialogResult.OK)
                {
                    string foldPath = dialog.SelectedPath;
                    textBox1.Text = foldPath;
                    //把选择路径存储在注册表
                    Application.UserAppDataRegistry.SetValue("ZMJASearchPath", foldPath);
                }
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }
    }
}

参考博客园里获取文件编码格式的类

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Search
{
    public class common
    {
        //编码问题目前为止，基本上没人解决，就连windows的IE的自动识别有时还识别错编码呢
        //如果文件有BOM则判断，如果没有就用系统默认编码，缺点：没有BOM的非系统编码文件会显示乱码。   
        //调用方法： common.GetType(filename)    
        public static System.Text.Encoding GetType(string FILE_NAME)
        {
            using (FileStream fs = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read))
            {
                System.Text.Encoding r = GetType(fs);
                fs.Close();
                return r;
            }
        }
        /// <summary> 
        /// 通过给定的文件流，判断文件的编码类型 
        /// </summary> 
        /// <param name="fs">文件流</param> 
        /// <returns>文件的编码类型</returns> 
        public static System.Text.Encoding GetType(FileStream fs)
        {
            byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 };
            byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 };
            byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //带BOM 
            Encoding reVal = Encoding.Default;

            BinaryReader r = new BinaryReader(fs, System.Text.Encoding.Default);
            int i;
            int.TryParse(fs.Length.ToString(), out i);
            byte[] ss = r.ReadBytes(i);
            if (IsUTF8Bytes(ss) || (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF))
            {
                reVal = Encoding.UTF8;
            }
            else if (ss[0] == 0xFE && ss[1] == 0xFF && ss[2] == 0x00)
            {
                reVal = Encoding.BigEndianUnicode;
            }
            else if (ss[0] == 0xFF && ss[1] == 0xFE && ss[2] == 0x41)
            {
                reVal = Encoding.Unicode;
            }
            r.Close();
            return reVal;

        }

        /// <summary> 
        /// 判断是否是不带 BOM 的 UTF8 格式 
        /// </summary> 
        /// <param name=“data“></param> 
        /// <returns></returns> 
        private static bool IsUTF8Bytes(byte[] data)
        {
            int charByteCounter = 1; //计算当前正分析的字符应还有的字节数 
            byte curByte; //当前分析的字节. 
            for (int i = 0; i < data.Length; i++)
            {
                curByte = data[i];
                if (charByteCounter == 1)
                {
                    if (curByte >= 0x80)
                    {
                        //判断当前 
                        while (((curByte <<= 1) & 0x80) != 0)
                        {
                            charByteCounter++;
                        }
                        //标记位首位若为非0 则至少以2个1开始 如:110XXXXX...........1111110X 
                        if (charByteCounter == 1 || charByteCounter > 6)
                        {
                            return false;
                        }
                    }
                }
                else
                {
                    //若是UTF-8 此时第一位必须为1 
                    if ((curByte & 0xC0) != 0x80)
                    {
                        return false;
                    }
                    charByteCounter--;
                }
            }
            if (charByteCounter > 1)
            {
                throw new Exception("非预期的byte格式");
            }
            return true;
        }
    }
}