C#以排列组合中的“组合”方式遍历某个文件夹下的所有文件

来源：互联网发布：windows平板手势编辑：程序博客网时间：2024/05/02 02:03

参考自：http://blog.csdn.net/zmazon/article/details/8315418#comments

 private void button1_Click(object sender, EventArgs e)        {            //temp文件夹下存放着我们的环境因子            DirectoryInfo folder = new DirectoryInfo(@"E:\work\test\data\temp");            string fileName;            FileInfo[] file = folder.GetFiles("*.asc");//只读取asc文件            string[] AttributeFiles = new string[file.Length];            for (int i = 0; i < file.Length; i++)            {                fileName = folder + "\\" + file[i].ToString();                AttributeFiles[i] = fileName;              }            int r = 3;//组合数,即C(r,n)中的r            if (null == AttributeFiles || AttributeFiles.Length == 0 || r <= 0 || r > AttributeFiles.Length)            {                MessageBox.Show("请检查文件夹的文件是否为空，参数n的设置是否有误。");            }            string[] AttributeFilesResult = new string[r];            getCombination(AttributeFiles, r, 0, AttributeFilesResult, 0);        }        private void getCombination(string[] a, int r, int begin, string[] b, int index)        {            string AttributeFile = "";            if (r == 0)            {                for (int i = 0; i < index; i++)                {                    AttributeFile = AttributeFile + b[i] + " ";                }                Console.WriteLine("AttributeFile=" + AttributeFile);            }            for (int i = begin; i < a.Length; i++)            {                for (int j = 0; j < r; j++)                {                    if (j % r != 0)                    {                          b[index] = a[i] + "#";//遍历文件，生成路径+文件名，在每个路径文件名后面加“#”号，末尾元素不加                    }                    else                    {                        b[index] = a[i];                    }                }                getCombination(a, r-1,i+1,b,index+1);            }        }

程序部分输出结果如下(C(3,4)，从文件夹中的4个文件中选出r=3的组合)：

AttributeFile=E:\work\test\data\temp\horizc.asc# E:\work\test\data\temp\profc.asc# E:\work\test\data\temp\slope.asc AttributeFile=E:\work\test\data\temp\horizc.asc# E:\work\test\data\temp\profc.asc# E:\work\test\data\temp\twi.asc AttributeFile=E:\work\test\data\temp\horizc.asc# E:\work\test\data\temp\slope.asc# E:\work\test\data\temp\twi.asc AttributeFile=E:\work\test\data\temp\profc.asc# E:\work\test\data\temp\slope.asc# E:\work\test\data\temp\twi.asc

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