创建指定大小文件代码,C#代码库,德仔网

代码语言

代码分类

【C#】创建指定大小文件

作者: / 发布于2019/10/18/ 328

// <summary>?
??????? /// 创建固定大小的临时文件?
??????? /// </summary>?
??????? /// <param name="fileName">文件名</param>?
??????? /// <param name="fileSize">文件大小</param>?
??????? /// <param name="overwrite">允许覆写：可以覆盖掉已经存在的文件</param>?
??????? public static void CreateFixedSizeFile(string fileName, long fileSize)
??????? {
??????????? //验证参数?
??????????? if (string.IsNullOrEmpty(fileName) || new[] { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar }.Contains(
??????????????????? fileName[fileName.Length - 1]))
??????????????? throw new ArgumentException("fileName");
??????????? if (fileSize < 0) throw new ArgumentException("fileSize");
??????????? //创建目录?
??????????? string dir = Path.GetDirectoryName(fileName);
??????????? if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
??????????????? Directory.CreateDirectory(dir);
??????????? //创建文件?
??????????? FileStream fs = null;
??????????? try
??????????? {
??????????????? fs = new FileStream(fileName, FileMode.Create);
??????????????? fs.SetLength(fileSize); //设置文件大小?
??????????? }
??????????? catch
??????????? {
??????????????? if (fs != null)
??????????????? {
??????????????????? fs.Close();
??????????????????? File.Delete(fileName); //注意，若由fs.SetLength方法产生了异常，同样会执行删除命令，请慎用overwrite:true参数，或者修改删除文件代码。?
??????????????? }
??????????????? throw;
??????????? }
??????????? finally
??????????? {
??????????????? if (fs != null) fs.Close();
??????????? }
??????? }
??????? /// <summary>
??????? /// 读取大文件用,读取文件前面指定长度字节数
??????? /// </summary>
??????? /// <param name="filePath">文件路径</param>
??????? /// <param name="readByteLength">读取长度,单位字节</param>
??????? /// <returns></returns>
??????? public byte[] ReadBigFile(string filePath,int readByteLength)
??????? {?
??????????? FileStream stream = new FileStream(filePath,FileMode.Open);
??????????? byte[] buffer = new byte[readByteLength];
??????????? stream.Read(buffer, 0, readByteLength);
??????????? stream.Close();
??????????? stream.Dispose();
??????????? return buffer;
??????????? //string str = Encoding.Default.GetString(buffer) //如果需要转换成编码字符串的话
??????? }
??????? /// <summary>
??????? /// 普通文件读取方法
??????? /// </summary>
??????? /// <param name="path"></param>
??????? /// <returns></returns>
??????? public string ReaderFile(string path)
??????? {
??????????? string fileData = string.Empty;
??????????? ///读取文件的内容?????
??????????? StreamReader reader = new StreamReader(path, Encoding.Default);
??????????? fileData = reader.ReadToEnd();
??????????? reader.Close();
??????????? reader.Dispose();
??????????? return fileData;
??????? }

评论列表

本站所提供的代码，版权归原作者所有，若有侵犯作者版权，请与我们联系，我们将立即删除或修改。谢谢!
本站所有代码发布及提供者。

试试其它关键字

同语言下

可能有用的

贡献的其它代码Label