u实验步骤（4）：<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

向FileOption.cs文件中添加代码如下：
//==============================第二部分：类设计============================

using System;

using System.Collections.Generic;

using System.Text;

using System.IO;

 

namespace FileOptionApplication

{

    class MyFileOption

    {

        /// <summary>

        /*******************************************************

        **方法 名：WriteTextFile

        **输入参数：filepath:文件路径；

        **          filecontent：写入文件的内容

        **          WriteMethord：写入方法（0：打开并创建文件；1：添加文本；2：新建文本）

        **输出参数：逻辑类型参数

        **返 回 值：bool

        **创建 人：钱哨

        **创建日期：<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />09-7-9

        **描    述：打开存放在某目录下名称为filepath文件，并在该文件中写入filecontent。

        *******************************************************/

        public bool WriteTextFile(string filepath, string filecontent, Int16 WriteMethord)

        {

            bool i = true;

            try

            {

                if (WriteMethord == 0)

                {

              FileStream textfile = File.Open(filepath, FileMode.OpenOrCreate, FileAccess.Write);

                    StreamWriter sw = new StreamWriter(textfile, Encoding.Default);

                    sw.Write(filecontent);

                    i = true;

                    sw.Close();

                    textfile.Close();

                }

                else if (WriteMethord == 1)

                {

                    FileStream textfile = File.Open(filepath, FileMode.Append, FileAccess.Write);

                    StreamWriter sw = new StreamWriter(textfile, Encoding.Default);

                    sw.Write(filecontent);

                    i = true;

                    sw.Close();

                    textfile.Close();

                }

                else if (WriteMethord == 2)

                {

                    FileStream textfile = File.Open(filepath, FileMode.Create, FileAccess.Write);

                    StreamWriter sw = new StreamWriter(textfile, Encoding.Default);

                    sw.Write(filecontent);

                    i = true;

                    sw.Close();

                    textfile.Close();

                }

                return i;

            }

            catch

            {

                i = false;

                return i;

            }

        }

        /// <summary>

        /*******************************************************

        **方法 名：DiskFileOption

        **输入参数：SourcePath:源文件路径；

        **           TargetPath：目的文件路径；

        **           OptionMethord：操作类别;0：文件创建；1：文件删除；2：文件复制；3：文件移动

        **输出参数：逻辑类型参数

        **返 回 值：bool

        **创 建 人：钱哨

        **创建日期：09-7-9

        **描    述：对磁盘文件实施基本操作。

        *******************************************************/

        public bool DiskFileOption(string SourcePath, string TargetPath, Int16 OptionMethord)

        {

            bool i = true;

            try

            {

                if (OptionMethord == 0)

                {

                   //文件创建

                    FileStream textfile = File.Create(SourcePath);

                    textfile.Close();

                }

                else if (OptionMethord == 1)

                {

                    //文件删除

                    File.Delete(SourcePath);

                }

                else if (OptionMethord == 2)

                {

                    //文件复制

                    File.Copy(SourcePath, TargetPath, true);

                }

                else if (OptionMethord == 3)

                {

                    //文件移动

                    File.Move(SourcePath,TargetPath);

                }

                return i;

            }

            catch

            {

                i = false;

                return i;

            }

        }
....（未完待续）