学步园

此方法只适合于小文件的内容替换

using System;
using System.IO;
using System.Text.RegularExpressions;

/// <summary>
/// Replaces text in a file.
/// </summary>
/// <param name="filePath">Path of the text file.</param>
/// <param name="searchText">Text to search for.</param>
/// <param name="replaceText">Text to replace the search text.</param>
        public void ReplaceInPath(string filePath, string searchText, string replaceText)
        {
            if (Directory.Exists(filePath))
            {                             
                foreach (string file in Directory.GetFiles(filePath))
                {
                    ReplaceInFile(file, searchText, replaceText);
                }
                foreach (string path in Directory.GetDirectories(filePath))
                {
                    ReplaceInPath(path, searchText, replaceText);
                }
            }
            else if (File.Exists(filePath))
            {
                ReplaceInFile(filePath, searchText, replaceText);
            }
        }
        public void ReplaceInFile( string filePath, string searchText, string replaceText )
        {
            try
            {
                StreamReader reader = new StreamReader(filePath, Encoding.Default);
                string content = reader.ReadToEnd();
                reader.Close();
                content = Regex.Replace(content, searchText, replaceText);
                StreamWriter writer = new StreamWriter(filePath, false, Encoding.Default);
                writer.Write(content);
                writer.Close();
            }
            catch (System.Exception e)
            {            
            }           
        }