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

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