按文件扩展名移动文件的小实例

首先在c:/file目录下建立两个文件夹bmpfile和giffile,在c:/file下放几张图片

private void fileExtension()
        ...{
            System.String fPath = @"C: ile";
            DirectoryInfo dirInfo = new DirectoryInfo(fPath);
            FileInfo[] fi = dirInfo.GetFiles();
            //get the num of the file
            System.Int32 fileNum = fi.Length;
            MessageBox.Show("the num of the file is " + fileNum);
            foreach (FileInfo fInfo in fi)
            ...{               
                switch (fInfo.Extension)
                ...{
                    case ".bmp":
                        //最后一个后有空格
                        fInfo.MoveTo(@"C: ilempfile " + fInfo.Name);
                        break;
                    case ".gif":
                        fInfo.MoveTo(@"C: ilegiffile " + fInfo.Name);
                        break;
                    default:
                        break;
                }
            }
        }