FileStream实例

 using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// FileOperate 的摘要说明
/// </summary>
public class FileOperate
{
     public FileOperate()
     {
         //
         // TODO: 在此处添加构造函数逻辑
         //
     }

     //生成一个文件
     public static bool WriteFile(string FileContent,string FilePath)
     {
         try
         {
             string strPath = System.Web.HttpContext.Current.Server.MapPath(FilePath);
             if(System.IO.File.Exists(strPath))
             {
                 System.IO.File.Delete(strPath);
             }
             System.IO.FileStream Fs = System.IO.File.Create(strPath);
             byte[] bcontent = System.Text.Encoding.GetEncoding("GB2312").GetBytes(FileContent);
             Fs.Write(bcontent,0,bcontent.Length);
             Fs.Close();
             Fs = null;
             return true;
         }
         catch
         {
             return false;
         }
         finally
         {
       
         }         

     }

     //读入文件
     public static string ReadWrite(string FilePath)
     {
         try
         {
             string strPath = System.Web.HttpContext.Current.Server.MapPath(FilePath);
             if (System.IO.File.Exists(strPath))
             {
                 string strRead = System.IO.File.ReadAllText(strPath, System.Text.Encoding.GetEncoding("gb2312"));
                 return strRead;
             }
             else
             {
                 return "false";
             }

         }
         catch
         {
             return "false";
         }
         finally
         {

         }
   
     }

     //向文件中增加内容
     public static bool UpdateFile(string FilePath, string FileContent)
     {
         try
         {  
             string strPath = System.Web.HttpContext.Current.Server.MapPath(FilePath).ToString();
             if (!System.IO.File.Exists(strPath))
             {
                 //文件不存在，生成文件
                 System.IO.FileStream Fs = System.IO.File.Create(strPath);
                 byte[] bcontent = System.Text.Encoding.GetEncoding("GB2312").GetBytes(FileContent);
                 Fs.Write(bcontent, 0, bcontent.Length);
                 Fs.Close();
                 Fs = null;
                 return true;
             }

             System.IO.FileStream FileRead = new System.IO.FileStream(strPath, System.IO.FileMode.Open, System.IO.FileAccess.ReadWrite);
             System.IO.StreamReader FileReadWord = new System.IO.StreamReader(FileRead, System.Text.Encoding.Default);
             string OldString = FileReadWord.ReadToEnd().ToString();
             OldString = OldString + FileContent;
             //把新的内容重新写入
             System.IO.StreamWriter FileWrite = new System.IO.StreamWriter(FileRead, System.Text.Encoding.Default);
             FileWrite.Write(OldString);
             //关闭
             FileWrite.Close();
             FileReadWord.Close();
             FileRead.Close();
             return true;
           

     
         }
         catch
         {
             //     throw;
             return false;
         }
     }

     //删除文件
     public static bool DeleteFile(string FilePath)
     {
         try
         {
             string strPath = System.Web.HttpContext.Current.Server.MapPath(FilePath).ToString();
             if (System.IO.File.Exists(strPath))
             {
                 System.IO.File.Delete(strPath);
             }
             return true;
         }
         catch
         {
             return false;
         }
         finally
         {
       
         }

     }

     //创建文件夹
     public static bool CreateFolder(string FolderName)
     {
         if (FolderName.Trim().Length > 0)
         {
             try
             {
                 string FolderPath = System.Web.HttpContext.Current.Server.MapPath(FolderName);
                 if (!System.IO.Directory.Exists(FolderPath))
                 {
                     System.IO.Directory.CreateDirectory(FolderPath);
                     return true;
                 }
                 else
                 {
                     return true;
                 }
             }
             catch
             {
                 return false;
             }
             finally
             {

             }
         }
         else
         {
             return false;
         }
     }

     //删除整个文件夹及其字文件夹和文件
     public static bool DeleteFolder(string FolderName)
     {
         if (FolderName.Trim().Length > 0)
         {
             try
             {
                 string FolderPath = System.Web.HttpContext.Current.Server.MapPath(FolderName);
                 if (System.IO.Directory.Exists(FolderPath))
                 {
                     System.IO.Directory.Delete(FolderPath,true);
                     return true;
                 }
                 else
                 {
                     return true;
                 }
             }
             catch
             {
                 return false;
             }
             finally
             {

             }
         }
         else
         {
             return false;
         }
     }

     // 删除整个文件夹及其字文件夹和文件 (验证没成功)

     public static bool DeleParentFolder(string FolderPathName)
     {
         try
         {
             string strPath = System.Web.HttpContext.Current.Server.MapPath(FolderPathName).ToString();
             System.IO.DirectoryInfo DelFolder = new System.IO.DirectoryInfo(strPath);
             if (DelFolder.Exists)
             {
                 DelFolder.Delete();
             }
             return true;
         }
         catch
         {
             return false;
         }
     }

     //遍历一个目录下的全部目录

     public static DataTable GetDir(string FilePath)
     {
         DataTable tb = new DataTable();
         tb.Columns.Add("name",typeof(string));
         tb.Columns.Add("fullname", typeof(string));
         string strPath = System.Web.HttpContext.Current.Server.MapPath(FilePath).ToString();
         System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(strPath);

         foreach ( System.IO.DirectoryInfo dChild in dir.GetDirectories("*"))
         {
             //如果用GetDirectories("ab*"),那么全部以ab开头的目录会被显示
            DataRow Dr=tb.NewRow();
            Dr["name"] = dChild.Name; //打印目录名
            Dr["fullname"] = dChild.FullName; //打印路径和目录名
            tb.Rows.Add(Dr);
           
         }
         return tb;

     }

     //遍历一个目录下的全部目录

     public static DataTable GetFile(string FilePath)
     {
         DataTable tb = new DataTable();
         tb.Columns.Add("name", typeof(string));
         tb.Columns.Add("fullname", typeof(string));
         string strPath = System.Web.HttpContext.Current.Server.MapPath(FilePath).ToString();
         System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(strPath);

         foreach (System.IO.FileInfo dChild in dir.GetFiles("*"))
         {
             //如果用GetDirectories("ab*"),那么全部以ab开头的目录会被显示
             DataRow Dr = tb.NewRow();
             Dr["name"] = dChild.Name; //打印目录名
             Dr["fullname"] = dChild.FullName; //打印路径和目录名
             tb.Rows.Add(Dr);

         }
         return tb;

     }