C#保存文件时重名自动生成新文件的方法

将一个文档保存为 a.txt 时，发现此文件已经存在，则自动保存为 a(1).txt，如果不存在，仍为a.txt


/// <summary>
/// Generates a new path for duplicate filenames.
/// </summary>
/// <param name="path">The path.</param>
/// <returns></returns>
private string GetNewPathForDupes( string path )
{
    string directory = Path.GetDirectoryName( path );
    string filename = Path.GetFileNameWithoutExtension( path );
    string extension = Path.GetExtension( path );
    int counter = 1;
 
    string newFullPath=path;
 
    while ( System.IO.File.Exists( newFullPath ) )
    {
    string newFilename = "{0}({1}){2}".FormatWith( filename, counter, extension );
    newFullPath = Path.Combine( directory, newFilename );
    counter++;
    } 
 
    return newFullPath;
}