Tests if the specified file is newer than the reference file. : File Util « File Stream « C# / C Sharp

Tests if the specified file is newer than the reference file.

#region License and Copyright
/* -------------------------------------------------------------------------
 * Dotnet Commons IO
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License 
 * for more details. 
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this library; if not, write to the 
 * Free Software Foundation, Inc., 
 * 59 Temple Place, 
 * Suite 330, 
 * Boston, 
 * MA 02111-1307 
 * USA 
 * -------------------------------------------------------------------------

using System;
using System.Collections;
using System.Globalization;
using System.IO;

namespace Dotnet.Commons.IO
  /// <summary>  
  /// This class provides basic facilities for manipulating files and file paths.
    /// <h3>File-related methods</h3>
    /// There are methods to 
    /// <list type="bullet">
    ///     <item>copy a file to another file,</item>
    ///     <item>compare the content of 2 files,</item>
    ///     <item>delete files using the wildcard character,</item>
    ///     <item>etc</item>
    /// </list>
  /// </summary>
  public sealed class FileUtils

        /// ---------------------------------------------------------------
        /// <summary> Tests if the specified <i>file</i> is newer than the reference 
        ///  <i>file</i>.
        /// </summary>
        /// <param name="newerFile">the <i>file</i> of which the modification date must be compared
        /// </param>
        /// <param name="referenceFile">the <i>file</i> of which the modification date is used 
        /// like reference
        /// </param>
        /// <returns> true if the <i>file</i> exists and has been modified more recently
        /// than the reference <i>file</i>.
        /// </returns>
        /// ---------------------------------------------------------------
        public static bool IsNewer(FileInfo newerFile, FileInfo referenceFile)

            if (referenceFile == null)
                throw new ArgumentNullException("referenceFile");

            bool exists = referenceFile.Exists;
            if (!referenceFile.Exists)
                exists = Directory.Exists(referenceFile.FullName);
            if (!exists)
                throw new System.ArgumentException("The reference file '" + referenceFile + "' doesn't exist");

            return IsNewer(newerFile, referenceFile.LastWriteTime);

        /// ---------------------------------------------------------------
        /// <summary>
        /// Tests if the specified <i>file</i> is newer than the specified 
    /// time reference.    
        /// </summary>
        /// <param name="file">the <i>file</i> of which the modification date must be compared.</param>
        /// <param name="timeCompare">the time reference</param>
        /// <returns>true if the <i>file</i> exists and has been modified after
        /// the given time reference.</returns>
        /// ---------------------------------------------------------------
        public static bool IsNewer(FileInfo file, DateTime timeCompare)
            if (file == null)            
                throw new ArgumentException("No file specified");

            bool exists = file.Exists;
            if (!file.Exists)                
                exists = Directory.Exists(file.FullName);
            if (!exists)            
                return false;

            return (file.LastWriteTime > timeCompare);


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