C#常用文件操作

using UnityEngine;
using System.Collections;
using System;
using System.IO;

public class FilesHelper {

	private const string PATH_SPLIT_CHAR = "\\";
	
	/// <summary>	
	/// 返回文件是否存在	
	/// </summary>	
	/// <param name="filename">文件名</param>	
	/// <returns>是否存在</returns>	
	public static bool FileExists(string filename)		
	{		
		return System.IO.File.Exists(filename);		
	}

	public static void Copy_mxh(string sourceDir, string targetDir, bool overWrite){
		File.Copy(sourceDir, targetDir, overWrite);	
	}

	/// <summary>	
	/// 复制指定目录的所有文件	
	/// </summary>	
	/// <param name="sourceDir">原始目录</param>	
	/// <param name="targetDir">目标目录</param>	
	/// <param name="overWrite">如果为true,覆盖同名文件,否则不覆盖</param>	
	public static void CopyFiles(string sourceDir, string targetDir, bool overWrite)		
	{	
		//复制当前目录文件		
		foreach (string sourceFileName in Directory.GetFiles(sourceDir))			
		{	
			string targetFileName = Path.Combine(targetDir, sourceFileName.Substring(sourceFileName.LastIndexOf(PATH_SPLIT_CHAR) + 1));	
			if (File.Exists(targetFileName))				
			{			
				if (overWrite == true)					
				{				
					File.SetAttributes(targetFileName, FileAttributes.Normal);					
					File.Copy(sourceFileName, targetFileName, overWrite);	
				}			
			}			
			else				
			{				
				File.Copy(sourceFileName, targetFileName, overWrite);				
			}			
		}		
	}


	/// <summary>	
	/// 删除指定目录下的指定文件	
	/// </summary>	
	/// <param name="TargetFileDir">指定文件的目录</param>	
	public static void DeleteFiles(string TargetFileDir)		
	{		
		File.Delete(TargetFileDir);
	}

	/// <summary>	
	/// 创建指定目录	
	/// </summary>	
	/// <param name="targetDir"></param>	
	public static void CreateDirectory(string targetDir)		
	{		
		DirectoryInfo dir = new DirectoryInfo(targetDir);		
		if (!dir.Exists)			
			dir.Create();		
	}


	/// <summary>	
	/// 检测目录是否存在	
	/// </summary>	
	/// <param name="StrPath">路径</param>	
	/// <param name="Create">如果不存在，是否创建</param>	
	public static void DirectoryIsExists(string StrPath, bool Create)		
	{		
		DirectoryInfo dirInfo = new DirectoryInfo(StrPath);		
		//return dirInfo.Exists;		
		if (!dirInfo.Exists)			
		{		
			if (Create) dirInfo.Create();		
		}		
	}
		
	/// <summary>	
	/// 返回指定路径的文件的扩展名	
	/// </summary>	
	/// <param name="PathFileName">完整路径的文件</param>	
	/// <returns></returns>	
	public string GetFileExtension(string PathFileName)		
	{		
		return Path.GetExtension(PathFileName);		
	}

	//_____________________________________________________________________________________________________//

}

原文：http://www.cnblogs.com/zfanlong1314/p/3916033.html