C#中对文件File常用操作方法的工具类

场景

C#中File类的常用读取与写入文件方法的使用：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/99693983

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实现

获取文件的扩展名

        /// <summary>
        /// 获取文件的扩展名
        /// </summary>
        /// <param name="filename">完整文件名</param>
        /// <returns>返回扩展名</returns>
  public static string GetPostfixStr(string filename)
  {
   int num = filename.LastIndexOf(".");
   int length = filename.Length;
   return filename.Substring(num, length - num);
  }

读取文件内容

      /// <summary>
        /// 读取文件内容
        /// </summary>
        /// <param name="path">要读取的文件路径</param>
        /// <returns>返回文件内容</returns>
  public static string ReadFile(string path)
  {
   string result;
   if (!System.IO.File.Exists(path))
   {
    result = "不存在相应的目录";
   }
   else
   {
    System.IO.FileStream stream = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite);
    System.IO.StreamReader streamReader = new System.IO.StreamReader(stream, System.Text.Encoding.Default);
    result = streamReader.ReadToEnd();
    streamReader.Close();
    streamReader.Dispose();
   }
   return result;
  }

指定编码格式读取文件内容

     /// <summary>
        /// 读取文件内容
        /// </summary>
        /// <param name="path">要读取的文件路径</param>
        /// <param name="encoding">编码格式</param>
        /// <returns>返回文件内容</returns>
        public static string ReadFile(string path, System.Text.Encoding encoding)
        {
            string result;
            if (!System.IO.File.Exists(path))
            {
                result = "不存在相应的目录";
            }
            else
            {
                System.IO.FileStream stream = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite);
                System.IO.StreamReader streamReader = new System.IO.StreamReader(stream, encoding);
                result = streamReader.ReadToEnd();
                streamReader.Close();
                streamReader.Dispose();
            }
            return result;
        }

向指定文件写入内容

      /// <summary>
        /// 向指定文件写入内容
        /// </summary>
        /// <param name="path">要写入内容的文件完整路径</param>
        /// <param name="content">要写入的内容</param>
  public static void WriteFile(string path, string content)
  {
   try
   {
    object obj = new object();
    if (!System.IO.File.Exists(path))
    {
     System.IO.FileStream fileStream = System.IO.File.Create(path);
     fileStream.Close();
    }
    lock (obj)
    {
     using (System.IO.StreamWriter streamWriter = new System.IO.StreamWriter(path, false, System.Text.Encoding.Default))
     {
      streamWriter.WriteLine(content);
      streamWriter.Close();
      streamWriter.Dispose();
     }
    }
   }
   catch (System.Exception ex)
   {
                ICSharpCode.Core.LoggingService<FileHelper>.Error(String.Format("写入文件{0}异常:{1}", path, ex.Message), ex);
   }
  }

指定编码格式向文件写入内容

       /// <summary>
        /// 向指定文件写入内容
        /// </summary>
        /// <param name="path">要写入内容的文件完整路径</param>
        /// <param name="content">要写入的内容</param>
        /// <param name="encoding">编码格式</param>
        public static void WriteFile(string path, string content, System.Text.Encoding encoding)
        {
            try
            {
                object obj = new object();
                if (!System.IO.File.Exists(path))
                {
                    System.IO.FileStream fileStream = System.IO.File.Create(path);
                    fileStream.Close();
                }
                lock (obj)
                {
                    using (System.IO.StreamWriter streamWriter = new System.IO.StreamWriter(path, false, encoding))
                    {
                        streamWriter.WriteLine(content);
                        streamWriter.Close();
                        streamWriter.Dispose();
                    }
                }
            }
            catch (System.Exception ex)
            {
                ICSharpCode.Core.LoggingService<FileHelper>.Error(String.Format("写入文件{0}异常:{1}", path, ex.Message), ex);
            }
        }

文件复制

        /// <summary>
        /// 文件复制
        /// </summary>
        /// <param name="orignFile">源文件完整路径</param>
        /// <param name="newFile">目标文件完整路径</param>
  public static void FileCoppy(string orignFile, string newFile)
  {
   System.IO.File.Copy(orignFile, newFile, true);
  }

文件删除

       /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="path">要删除的文件的完整路径</param>
  public static void FileDel(string path)
  {
   System.IO.File.Delete(path);
  }

文件移动

       /// <summary>
        /// 文件移动（剪贴->粘贴）
        /// </summary>
        /// <param name="orignFile">源文件的完整路径</param>
        /// <param name="newFile">目标文件完整路径</param>
  public static void FileMove(string orignFile, string newFile)
  {
   System.IO.File.Move(orignFile, newFile);
  }

判断一组文件是否都存在

     /// <summary>
        /// 判断一组文件是否都存在
        /// </summary>
        /// <param name="filePathList">文件路径List</param>
        /// <returns>文件是否全部存在</returns>
        public static bool IsFilesExist(List<string> filePathList)
        {
            bool isAllExist = true;
            foreach(string filePath in filePathList)
            {
                if(!File.Exists(filePath))
                {
                    isAllExist = false;
                }
            }
            return isAllExist;
        }

创建目录

       /// <summary>
        /// 创建目录
        /// </summary>
        /// <param name="orignFolder">当前目录</param>
        /// <param name="newFloder">要创建的目录名</param>
  public static void FolderCreate(string orignFolder, string newFloder)
  {
   System.IO.Directory.SetCurrentDirectory(orignFolder);
   System.IO.Directory.CreateDirectory(newFloder);
  }

删除目录

     /// <summary>
        /// 删除目录
        /// </summary>
        /// <param name="dir">要删除的目录</param>
  public static void DeleteFolder(string dir)
  {
   if (System.IO.Directory.Exists(dir))
   {
    string[] fileSystemEntries = System.IO.Directory.GetFileSystemEntries(dir);
    for (int i = ; i < fileSystemEntries.Length; i++)
    {
     string text = fileSystemEntries[i];
     if (System.IO.File.Exists(text))
     {
      System.IO.File.Delete(text);
     }
     else
     {
      FileHelper.DeleteFolder(text);
     }
    }
    System.IO.Directory.Delete(dir);
   }
  }

目录内容复制

     /// <summary>
        /// 目录内容复制
        /// </summary>
        /// <param name="srcPath">源目录</param>
        /// <param name="aimPath">目标目录</param>
  public static void CopyDir(string srcPath, string aimPath)
  {
   try
   {
    if (aimPath[aimPath.Length - ] != System.IO.Path.DirectorySeparatorChar)
    {
     aimPath += System.IO.Path.DirectorySeparatorChar;
    }
    if (!System.IO.Directory.Exists(aimPath))
    {
     System.IO.Directory.CreateDirectory(aimPath);
    }
    string[] fileSystemEntries = System.IO.Directory.GetFileSystemEntries(srcPath);
    string[] array = fileSystemEntries;
    for (int i = ; i < array.Length; i++)
    {
     string text = array[i];
     if (System.IO.Directory.Exists(text))
     {
      FileHelper.CopyDir(text, aimPath + System.IO.Path.GetFileName(text));
     }
     else
     {
      System.IO.File.Copy(text, aimPath + System.IO.Path.GetFileName(text), true);
     }
    }
   }
   catch (System.Exception ex)
   {
    throw new System.Exception(ex.ToString());
   }
  }