使用Path对象判断路径的完整性和正确性

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.
         */
    }
}

使用FileInfo创建文件

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());
        }
    }
}