using System;

using System.IO;

class Test

{

    public static void Main()

    {

        string path1 = @"c:\temp\MyTest.txt";

        string path2 = @"c:\temp\MyTest";

        string path3 = @"temp";

        if (Path.HasExtension(path1))

        {

            Console.WriteLine("{0} has an extension.", path1);

        }

        if (!Path.HasExtension(path2))

        {

            Console.WriteLine("{0} has no extension.", path2);

        }

        if (!Path.IsPathRooted(path3))

        {

            Console.WriteLine("The string {0} contains no root information.", path3);

        }

        Console.WriteLine("The full path of {0} is {1}.", path3, Path.GetFullPath(path3));

        Console.WriteLine("{0} is the location for temporary files.", Path.GetTempPath());

        Console.WriteLine("{0} is a file available for use.", Path.GetTempFileName());

        /* This code produces output similar to the following:

         * c:\temp\MyTest.txt has an extension.

         * c:\temp\MyTest has no extension.

         * The string temp contains no root information.

         * The full path of temp is D:\Documents and Settings\cliffc\My Documents\Visual Studio 2005\Projects\ConsoleApplication2\ConsoleApplication2\bin\Debug\temp.

         * D:\Documents and Settings\cliffc\Local Settings\Temp\8\ is the location for temporary files.

         * D:\Documents and Settings\cliffc\Local Settings\Temp\8\tmp3D.tmp is a file available for use.

         */

    }

}

using System;

using System.IO;

class Test

{

    public static void Main()

    {

        //通过Path对象获取缓存路径

        string path = Path.GetTempFileName();

        FileInfo fi1 = new FileInfo(path);

        //创建文件，并且通过返回的"文件流写入对象"写入数据

        using (StreamWriter sw = fi1.CreateText())

        {

            sw.WriteLine("Hello");

            sw.WriteLine("And");

            sw.WriteLine("Welcome");

        }	

        //打开文件，并且通过返回的"文件流读取对象"读取数据

        using (StreamReader sr = fi1.OpenText())

        {

            string s = "";

            while ((s = sr.ReadLine()) != null)

            {

                Console.WriteLine(s);

            }

        }

        try

        {

            string path2 = Path.GetTempFileName();

            FileInfo fi2 = new FileInfo(path2);

            //删除文件

            fi2.Delete();

            //将f1文件拷贝到f2文件

            fi1.CopyTo(path2);

            Console.WriteLine("{0} was copied to {1}.", path, path2);

            //删除文件

            fi2.Delete();

            Console.WriteLine("{0} was successfully deleted.", path2);

        }

        catch (Exception e)

        {

            Console.WriteLine("The process failed: {0}", e.ToString());

        }

    }

}