下面这段代码是自己写的一段程序段,主要功能是在一个确定的路径下面随机搜索n个项目.

protected

 

void

 Button1_Click(

object

 sender, EventArgs e)

    

{

        try

        {

            Label3.Visible = true;

            Label3.Text = "";

            TableRow tr;

            TableCell tc;

            Random autoRand = new Random();

            ArrayList arr = new ArrayList();

            double percentage = Convert.ToInt32(TextBox3.Text);

            percentage = percentage / 100;

            string name = TextBox1.Text;

            string str = "D:\\XXX\\" + name + "\\";

            int num = 0;

            DirectoryInfo dir = new DirectoryInfo(str);

            foreach (FileSystemInfo fsi in dir.GetFileSystemInfos())

            {

                filename = "";

                if (fsi is FileInfo)

                {

                    num++;

                    filename = fsi.FullName;

                    arr.Add(filename);

                }

                if (fsi is DirectoryInfo)

                {

                    num++;

                    filename = fsi.FullName;

                    arr.Add(filename);

                }

            }

            for (double i = 1; i <=percentage * num; i += 1)

            {

                int sum =Convert.ToInt32(percentage * num);

                foreach (FileSystemInfo fsi in dir.GetFileSystemInfos())

                {

                    filename = arr[autoRand.Next(1, num)].ToString();

                    tr = new TableRow();

                    tc = new TableCell();

                    tc.Controls.Add(new LiteralControl(filename.ToString()));

                    tr.Cells.Add(tc);

                    Table1.Rows.Add(tr);

                    break;

                }

            }

        }

        catch

        {

            Label3.Text = "不存在该项目,请确定后重新搜索!";

        }

    }