FileUtil.cs

/*************************************************************************************************
  Required Notice: Copyright (C) EPPlus Software AB. 
  This software is licensed under PolyForm Noncommercial License 1.0.0 
  and may only be used for noncommercial purposes 
  https://polyformproject.org/licenses/noncommercial/1.0.0/

  A commercial license to use this software can be purchased at https://epplussoftware.com
 *************************************************************************************************
  Date               Author                       Change
 *************************************************************************************************
  01/27/2020         EPPlus Software AB           Initial release EPPlus 5
 *************************************************************************************************/
using System;
using System.IO;
namespace EPPlusSamples
{
    public class FileUtil
    {
        static DirectoryInfo _outputDir = null;
        public static DirectoryInfo OutputDir
        {
            get
            {
                return _outputDir;
            }
            set
            {
                _outputDir = value;
                if (!_outputDir.Exists)
                {
                    _outputDir.Create();
                }
            }
        } 
        public static FileInfo GetCleanFileInfo(string file)
        {
            var fi = new FileInfo(OutputDir.FullName + Path.DirectorySeparatorChar + file);
            if (fi.Exists)
            { 
                fi.Delete();  // ensures we create a new workbook
            } 
            return fi; 
        }
        public static FileInfo GetFileInfo(string file)
        {
            return new FileInfo(OutputDir.FullName + Path.DirectorySeparatorChar + file);
        }

        public static FileInfo GetFileInfo(DirectoryInfo altOutputDir, string file, bool deleteIfExists = true)
        {
            var fi = new FileInfo(altOutputDir.FullName + Path.DirectorySeparatorChar + file);
            if (deleteIfExists && fi.Exists)
            {
                fi.Delete();  // ensures we create a new workbook
            }
            return fi;  
        }


        internal static DirectoryInfo GetDirectoryInfo(string directory)
        {
            var di = new DirectoryInfo(_outputDir.FullName + Path.DirectorySeparatorChar + directory);
            if (!di.Exists)
            {
                di.Create();
            }
            return di;
        }
        /// <summary>
        /// Returns a fileinfo with the full path of the requested file
        /// </summary>
        /// <param name="directory">A subdirectory</param>
        /// <param name="file"></param>
        /// <returns></returns>
        public static FileInfo GetFileInfo(string directory, string file)
        {
            var rootDir = GetRootDirectory().FullName;
            return new FileInfo(Path.Combine(rootDir, directory, file));
        }

        public static DirectoryInfo GetRootDirectory()
        {
            var currentDir = AppDomain.CurrentDomain.BaseDirectory;
            while (!currentDir.EndsWith("bin"))
            {
                currentDir = Directory.GetParent(currentDir).FullName.TrimEnd('\\');
            }
            return new DirectoryInfo(currentDir).Parent;
        }

        public static DirectoryInfo GetSubDirectory(string directory, string subDirectory)
        {
            var currentDir = GetRootDirectory().FullName;
            return new DirectoryInfo(Path.Combine(currentDir, directory, subDirectory));
        }
    }
}