一个文件夹操作类

//杨春
//2008-7-10
//删除指定目录下所有文件   用来处理饼状图  柱状图产生的缓冲文件

using System;
using System.Data;
using System.IO;
using System.Data.SqlClient;

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

        /// <summary>
        /// 根据文件路径删除文件
        /// </summary>
        /// <param name="path">文件名(路径)</param>
        /// <returns>是否成功</returns>
        public static bool DeleteSigleFile(string path)
        {
            FileInfo file = new FileInfo(path);
            try
            {
                if (file.Exists)
                {
                    file.Delete();
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
                return false;
            }
        }

        /// <summary>
        /// 删除指定目录和目录下所有文件
        /// </summary>
        /// <param name="path">目录路径</param>
        /// <returns>是否成功</returns>
        public static bool DeleteDirectory(string path)
        {
            FileInfo info = new FileInfo(path);
            if (info.Exists)
            {
                return DeleteSigleFile(path);
            }
            else
            {
                DirectoryInfo directory = new DirectoryInfo(path);
                try
                {
                    if (directory.Exists != true)
                    {
                        return false;
                    }
                    if (directory.GetFiles().Length < 1)
                    {
                        directory.Delete();
                        return true;
                    }
                    else
                    {
                        foreach (FileInfo file in directory.GetFiles())
                        {
                            string filepath = file.FullName;
                            if (DeleteSigleFile(filepath) != true)
                            {
                                return false;
                            }
                        }
                        directory.Delete();
                        return true;
                    }
                }
                catch (Exception ex)
                {
                    Console.Write(ex.Message);
                    return false;
                }
            }
        }

        /// <summary>
        /// 根据路径删除该目录下所有文件(不包含该目录)
        /// </summary>
        /// <param name="path">路径</param>
        /// <returns>是否删除成功</returns>
        public static bool DeleteAllFileInDirectory(string path)
        {
            FileInfo file = new FileInfo(path);
            if (file.Exists)
            {
                return DeleteSigleFile(path);
            }
            else
            {
                DirectoryInfo directory = new DirectoryInfo(path);
                try
                {
                    if (directory.Exists != true)
                    {
                        return false;
                    }
                    if (directory.GetFiles().Length < 1)
                    {
                        return true;
                    }
                    else
                    {
                        foreach (FileInfo info in directory.GetFiles())
                        {
                            string filePath = info.FullName;
                            if (DeleteSigleFile(filePath) != true)
                            {
                                return false;
                            }
                        }
                        return true;
                    }
                }
                catch (Exception ex)
                {
                    Console.Write(ex.Message);
                    return false;
                }
            }
           
        }

        /// <summary>
        /// 得到文件夹大小
        /// </summary>
        /// <param name="path">路径</param>
        /// <returns>大小</returns>
        public static long GetDirectoryLength(string path)
        {
            long length = 0;
            if (Directory.Exists(path))
            {
                DirectoryInfo directory = new DirectoryInfo(path);

                foreach (FileInfo file in directory.GetFiles())
                {
                    length += file.Length;
                }
                DirectoryInfo[] directoryInfo = directory.GetDirectories();
                if (directoryInfo.Length > 0)
                {
                    for (int i = 0; i < directoryInfo.Length; i++)
                    {
                        length = GetDirectoryLength(directoryInfo[i].FullName);
                    }
                }
                return length;
            }
            else
            {
                return length;
            }
        }

        /// <summary>
        /// 根据表名取得该表记录行数
        /// </summary>
        /// <param name="tableName">表名</param>
        /// <returns>记录行数</returns>
        public static int GetTableRecordCount(string tableName)
        {
            int result = 0;
            string sql = "SELECT COUNT(0) AS tableCount FROM " + tableName;
            SqlConnection connection = new SqlConnection(DAL.DbHelperSQL.GetConnectionString());
            SqlCommand cmd = new SqlCommand(sql, connection);
            try
            {
                connection.Open();
                result = (int)cmd.ExecuteScalar();
                return result;
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
                return 0;
            }
            finally
            {
                cmd.Dispose();
                connection.Close();
            }
               
        }

        /// <summary>
        /// 根据表名删除该表所有记录
        /// </summary>
        /// <param name="tableName">表名</param>
        /// <returns>操作是否成功</returns>
        public static bool DeleteTableRecord(string tableName)
        {
            string sql = "DELETE FROM " + tableName;
            SqlConnection connection = new SqlConnection(DAL.DbHelperSQL.GetConnectionString());
            SqlCommand cmd = new SqlCommand(sql, connection);
            try
            {
                connection.Open();
                if (cmd.ExecuteNonQuery() > 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
                return false;
            }
            finally
            {
                cmd.Dispose();
                connection.Close();
            }
        }
    }
}