winform--权限系统--01--框架介绍，通用数据库访问类介绍
以下是学习笔记：
参考：https://www.bilibili.com/video/BV1LK4y1k7HM?t=2583 感谢朝夕教育
一，项目框架介绍:
二，数据库的分析和创建
1，数据库的设计：
2，创建数据库的过程：
USE [master]
GO
/****** Object: Database [RightDBase] Script Date: 2020/4/3 星期五 下午 8:44:51 ******/
--数据库文件路径：'D:\课程\新课程\DBase' 改成本地存在的路径
--CREATE DATABASE [RightDBase]
CREATE DATABASE RightDBase
CONTAINMENT = NONE
ON PRIMARY
--( NAME = N'RightDBase', FILENAME = N'D:\课程\新课程\DBase\RightDBase.mdf' , SIZE = 5120KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )
( NAME = 'RightDBase', FILENAME = 'D:\DB\RightDBase.mdf' , SIZE = 5120KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )
LOG ON
--( NAME = N'RightDBase_log', FILENAME = N'D:\课程\新课程\DBase\RightDBase_log.ldf' , SIZE = 1024KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)
( NAME = 'RightDBase_log', FILENAME = 'D:\DB\RightDBase_log.ldf' , SIZE = 1024KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)
ALTER DATABASE [RightDBase] SET COMPATIBILITY_LEVEL = 110
GO
GO
IF (1 = FULLTEXTSERVICEPROPERTY('IsFullTextInstalled'))
begin
EXEC [RightDBase].[dbo].[sp_fulltext_database] @action = 'enable'
end
GO
ALTER DATABASE [RightDBase] SET ANSI_NULL_DEFAULT OFF
GO
ALTER DATABASE [RightDBase] SET ANSI_NULLS OFF
GO
ALTER DATABASE [RightDBase] SET ANSI_PADDING OFF
GO
ALTER DATABASE [RightDBase] SET ANSI_WARNINGS OFF
GO
ALTER DATABASE [RightDBase] SET ARITHABORT OFF
GO
ALTER DATABASE [RightDBase] SET AUTO_CLOSE OFF
GO
ALTER DATABASE [RightDBase] SET AUTO_CREATE_STATISTICS ON
GO
ALTER DATABASE [RightDBase] SET AUTO_SHRINK OFF
GO
ALTER DATABASE [RightDBase] SET AUTO_UPDATE_STATISTICS ON
GO
ALTER DATABASE [RightDBase] SET CURSOR_CLOSE_ON_COMMIT OFF
GO
ALTER DATABASE [RightDBase] SET CURSOR_DEFAULT GLOBAL
GO
ALTER DATABASE [RightDBase] SET CONCAT_NULL_YIELDS_NULL OFF
GO
ALTER DATABASE [RightDBase] SET NUMERIC_ROUNDABORT OFF
GO
ALTER DATABASE [RightDBase] SET QUOTED_IDENTIFIER OFF
GO
ALTER DATABASE [RightDBase] SET RECURSIVE_TRIGGERS OFF
GO
ALTER DATABASE [RightDBase] SET DISABLE_BROKER
GO
ALTER DATABASE [RightDBase] SET AUTO_UPDATE_STATISTICS_ASYNC OFF
GO
ALTER DATABASE [RightDBase] SET DATE_CORRELATION_OPTIMIZATION OFF
GO
ALTER DATABASE [RightDBase] SET TRUSTWORTHY OFF
GO
ALTER DATABASE [RightDBase] SET ALLOW_SNAPSHOT_ISOLATION OFF
GO
ALTER DATABASE [RightDBase] SET PARAMETERIZATION SIMPLE
GO
ALTER DATABASE [RightDBase] SET READ_COMMITTED_SNAPSHOT OFF
GO
ALTER DATABASE [RightDBase] SET HONOR_BROKER_PRIORITY OFF
GO
ALTER DATABASE [RightDBase] SET RECOVERY FULL
GO
ALTER DATABASE [RightDBase] SET MULTI_USER
GO
ALTER DATABASE [RightDBase] SET PAGE_VERIFY CHECKSUM
GO
ALTER DATABASE [RightDBase] SET DB_CHAINING OFF
GO
ALTER DATABASE [RightDBase] SET FILESTREAM( NON_TRANSACTED_ACCESS = OFF )
GO
ALTER DATABASE [RightDBase] SET TARGET_RECOVERY_TIME = 0 SECONDS
GO
EXEC sys.sp_db_vardecimal_storage_format N'RightDBase', N'ON'
GO
USE [RightDBase]
GO
/****** Object: Table [dbo].[MenuInfos] Script Date: 2020/4/3 星期五 下午 8:44:51 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[MenuInfos](
[MenuId] [int] IDENTITY(1,1) NOT NULL,
[MenuName] [nvarchar](50) NOT NULL,
[ParentId] [int] NOT NULL,
[FrmName] [varchar](500) NULL,
[MKey] [nchar](10) NULL,
CONSTRAINT [PK_MenuInfos] PRIMARY KEY CLUSTERED
(
[MenuId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
/****** Object: Table [dbo].[RoleInfos] Script Date: 2020/4/3 星期五 下午 8:44:51 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[RoleInfos](
[RoleId] [int] IDENTITY(1,1) NOT NULL,
[RoleName] [nvarchar](50) NULL,
[Remark] [nvarchar](500) NULL,
[IsAdmin] [int] NOT NULL,
CONSTRAINT [PK_RoleInfos] PRIMARY KEY CLUSTERED
(
[RoleId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[RoleMenuInfos] Script Date: 2020/4/3 星期五 下午 8:44:51 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[RoleMenuInfos](
[RMId] [int] IDENTITY(1,1) NOT NULL,
[RoleId] [int] NOT NULL,
[MenuId] [int] NOT NULL,
CONSTRAINT [PK_RoleMenuInfos] PRIMARY KEY CLUSTERED
(
[RMId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[UserInfos] Script Date: 2020/4/3 星期五 下午 8:44:51 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[UserInfos](
[UserId] [int] IDENTITY(101,1) NOT NULL,
[UserName] [varchar](20) NOT NULL,
[UserPwd] [varchar](50) NOT NULL,
CONSTRAINT [PK_UserInfos] PRIMARY KEY CLUSTERED
(
[UserId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
/****** Object: Table [dbo].[UserRoleInfos] Script Date: 2020/4/3 星期五 下午 8:44:51 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[UserRoleInfos](
[URId] [int] IDENTITY(1,1) NOT NULL,
[UserId] [int] NOT NULL,
[RoleId] [int] NOT NULL,
CONSTRAINT [PK_UserRoleInfos] PRIMARY KEY CLUSTERED
(
[URId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET IDENTITY_INSERT [dbo].[MenuInfos] ON
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (1, N'系统管理', 0, NULL, NULL)
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (2, N'新增菜单', 1, N'sm.FrmAddMenuInfo', NULL)
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (3, N'菜单列表', 1, N'sm.FrmMenuList', NULL)
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (4, N'角色列表', 1, N'sm.FrmRoleList', NULL)
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (5, N'权限分配', 1, N'sm.FrmRight', NULL)
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (6, N'用户列表', 1, N'sm.FrmUserList', NULL)
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (8, N'新增用户', 6, N'sm.FrmUserInfo', NULL)
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (10, N'成绩管理', 0, N'', N'Alt+S ')
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (11, N'成绩列表', 10, N'score.FrmScoreList', N' ')
INSERT [dbo].[MenuInfos] ([MenuId], [MenuName], [ParentId], [FrmName], [MKey]) VALUES (12, N'成绩信息', 10, N'score.FrmScoreInfo', N' ')
SET IDENTITY_INSERT [dbo].[MenuInfos] OFF
SET IDENTITY_INSERT [dbo].[RoleInfos] ON
INSERT [dbo].[RoleInfos] ([RoleId], [RoleName], [Remark], [IsAdmin]) VALUES (1, N'超级管理员', N'具有一切权限', 1)
INSERT [dbo].[RoleInfos] ([RoleId], [RoleName], [Remark], [IsAdmin]) VALUES (3, N'系统管理员', N'负责系统管理功能。ssssssssddddd', 0)
INSERT [dbo].[RoleInfos] ([RoleId], [RoleName], [Remark], [IsAdmin]) VALUES (4, N'成绩管理员', N'负责成绩信息管理', 0)
SET IDENTITY_INSERT [dbo].[RoleInfos] OFF
SET IDENTITY_INSERT [dbo].[RoleMenuInfos] ON
INSERT [dbo].[RoleMenuInfos] ([RMId], [RoleId], [MenuId]) VALUES (7, 3, 1)
INSERT [dbo].[RoleMenuInfos] ([RMId], [RoleId], [MenuId]) VALUES (8, 3, 2)
INSERT [dbo].[RoleMenuInfos] ([RMId], [RoleId], [MenuId]) VALUES (9, 3, 3)
INSERT [dbo].[RoleMenuInfos] ([RMId], [RoleId], [MenuId]) VALUES (10, 3, 6)
INSERT [dbo].[RoleMenuInfos] ([RMId], [RoleId], [MenuId]) VALUES (11, 3, 8)
INSERT [dbo].[RoleMenuInfos] ([RMId], [RoleId], [MenuId]) VALUES (12, 4, 10)
INSERT [dbo].[RoleMenuInfos] ([RMId], [RoleId], [MenuId]) VALUES (13, 4, 11)
INSERT [dbo].[RoleMenuInfos] ([RMId], [RoleId], [MenuId]) VALUES (14, 4, 12)
SET IDENTITY_INSERT [dbo].[RoleMenuInfos] OFF
SET IDENTITY_INSERT [dbo].[UserInfos] ON
INSERT [dbo].[UserInfos] ([UserId], [UserName], [UserPwd]) VALUES (101, N'admin', N'admin')
INSERT [dbo].[UserInfos] ([UserId], [UserName], [UserPwd]) VALUES (102, N'lyc001', N'123456')
SET IDENTITY_INSERT [dbo].[UserInfos] OFF
SET IDENTITY_INSERT [dbo].[UserRoleInfos] ON
INSERT [dbo].[UserRoleInfos] ([URId], [UserId], [RoleId]) VALUES (1, 101, 1)
INSERT [dbo].[UserRoleInfos] ([URId], [UserId], [RoleId]) VALUES (3, 102, 3)
SET IDENTITY_INSERT [dbo].[UserRoleInfos] OFF
ALTER TABLE [dbo].[RoleInfos] ADD CONSTRAINT [DF_RoleInfos_IsAdmin] DEFAULT ((0)) FOR [IsAdmin]
GO
ALTER TABLE [dbo].[RoleMenuInfos] WITH CHECK ADD CONSTRAINT [FK_RoleMenuInfos_RoleInfos] FOREIGN KEY([RoleId])
REFERENCES [dbo].[RoleInfos] ([RoleId])
GO
ALTER TABLE [dbo].[RoleMenuInfos] CHECK CONSTRAINT [FK_RoleMenuInfos_RoleInfos]
GO
ALTER TABLE [dbo].[UserRoleInfos] WITH CHECK ADD CONSTRAINT [FK_UserRoleInfos_RoleInfos] FOREIGN KEY([UserId])
REFERENCES [dbo].[UserInfos] ([UserId])
GO
ALTER TABLE [dbo].[UserRoleInfos] CHECK CONSTRAINT [FK_UserRoleInfos_RoleInfos]
GO
ALTER TABLE [dbo].[UserRoleInfos] WITH CHECK ADD CONSTRAINT [FK_UserRoleInfos_RoleInfos1] FOREIGN KEY([RoleId])
REFERENCES [dbo].[RoleInfos] ([RoleId])
GO
ALTER TABLE [dbo].[UserRoleInfos] CHECK CONSTRAINT [FK_UserRoleInfos_RoleInfos1]
GO
USE [master]
GO
ALTER DATABASE [RightDBase] SET READ_WRITE
GO
三，数据访问
1,通用数据访问类
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.Common;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace PM.DAL.Helper
{
/// <summary>
/// 数据库帮助类（工具类） 静态类操作起来更快
/// </summary>
public static class DBHelper
{
/// <summary>
/// 连接字符串
/// </summary>
private static string connStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
/// <summary>
/// 增、删、改的通用方法
/// 执行Sql语句或存储过程，返回受影响的行数
/// SQL注入
/// </summary>
/// <param name="sql">sql语句或存储过程名</param>
/// <param name="cmdType">执行的脚本类型 1:sql语句 2:存储过程</param>
/// <param name="parameters">参数列表</param>
/// <returns></returns>
public static int ExecuteNonQuery(string sql,int cmdType,params SqlParameter[] parameters)
{
//select @@Identity 返回上一次插入记录时自动产生的ID
int result = 0;//返回结果
using (SqlConnection conn = new SqlConnection(connStr))
{
//执行脚本的对象cmd
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
result = cmd.ExecuteNonQuery();//执行T-SQL并返回受影响行数
cmd.Parameters.Clear();
}
//using原理：类似于try finally
return result;
}
/// <summary>
/// 执行sql查询，返回第一行第一列的值
/// </summary>
/// <param name="sql">sql语句或存储过程</param>
/// <param name="cmdType">执行的脚本类型 1:sql语句 2:存储过程</param>
/// <param name="parameters">参数列表</param>
/// <returns></returns>
public static object ExecuteScalar(string sql,int cmdType, params SqlParameter[] parameters)
{
//params 只能写在一维数组之前，且只能标识参数列表中的最后一个参数
//select @@Identity 返回上一次插入记录时自动产生的ID
object result = null;//返回结果
using (SqlConnection conn = new SqlConnection(connStr))
{
//执行脚本的对象cmd
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
result = cmd.ExecuteScalar();//执行T-SQL并返回第一行第一列的值
cmd.Parameters.Clear();
if (result == null || result == DBNull.Value)
{
return null;
}
else
{
return result;
}
}
}
/// <summary>
/// 执行sql查询,返回SqlDataReader对象
/// </summary>
/// <param name="sql">sql语句或存储过程</param>
/// <param name="cmdType">执行的脚本类型 1:sql语句 2:存储过程</param>
/// <param name="parameters">参数列表</param>
/// <returns></returns>
public static SqlDataReader ExecuteReader(string sql,int cmdType,params SqlParameter[] parameters)
{
SqlConnection conn = new SqlConnection(connStr);
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
SqlDataReader reader;
try
{
reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return reader;
}
catch (Exception ex)
{
conn.Close();
throw new Exception("创建reader对象发生异常", ex);
}
}
/// <summary>
/// 执行查询，查询结果填充到DataTable 只针对查询一个表的情况
/// </summary>
/// <param name="sql">sql语句或存储过程</param>
/// <param name="cmdType">执行的脚本类型 1:sql语句 2:存储过程</param>
/// <param name="parameters">参数列表</param>
/// <returns></returns>
public static DataTable GetDataTable(string sql,int cmdType,params SqlParameter[] parameters)
{
DataTable dt = null;
using (SqlConnection conn = new SqlConnection(connStr))
{
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
SqlDataAdapter da = new SqlDataAdapter(cmd);
dt = new DataTable();
da.Fill(dt);
}
return dt;
}
/// <summary>
/// 执行查询，数据填充到DataSet
/// </summary>
/// <param name="sql">sql语句或存储过程</param>
/// <param name="cmdType">执行的脚本类型 1:sql语句 2:存储过程</param>
/// <param name="parameters">参数列表</param>
/// <returns></returns>
public static DataSet GetDataSet(string sql, int cmdType, params SqlParameter[] parameters)
{
DataSet ds = null;
using (SqlConnection conn = new SqlConnection(connStr))
{
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
//数据适配器
//conn 自动打开 断开式连接
SqlDataAdapter da = new SqlDataAdapter(cmd);
ds = new DataSet();
da.Fill(ds);
//自动关闭conn
}
return ds;
}
/// <summary>
/// 事务 执行批量sql
/// </summary>
/// <param name="listSql"></param>
/// <returns></returns>
public static bool ExecuteTrans(List<string> listSql)
{
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
SqlTransaction trans = conn.BeginTransaction();
SqlCommand cmd = BuilderCommand(conn, "", 1, trans);
try
{
int count = 0;
for (int i = 0; i < listSql.Count; i++)
{
if (listSql[i].Length > 0)
{
cmd.CommandText = listSql[i];
cmd.CommandType = CommandType.Text;
count += cmd.ExecuteNonQuery();
}
}
trans.Commit();
return true;
}
catch (Exception ex)
{
trans.Rollback();
throw new Exception("执行事务出现异常", ex);
}
}
}
/// <summary>
/// 事务 批量执行 CommandInfo 包括sql,脚本类型，参数列表
/// </summary>
/// <param name="comList"></param>
/// <returns></returns>
public static bool ExecuteTrans(List<CommandInfo> comList)
{
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
SqlTransaction trans = conn.BeginTransaction();
SqlCommand cmd = BuilderCommand(conn, "", 1, trans);
try
{
int count = 0;
for (int i = 0; i < comList.Count; i++)
{
cmd.CommandText = comList[i].CommandText;
if (comList[i].IsProc)
cmd.CommandType = CommandType.StoredProcedure;
else
cmd.CommandType = CommandType.Text;
if (comList[i].Paras.Length > 0)
{
cmd.Parameters.Clear();//记得清空，一定要记住
foreach (var p in comList[i].Paras)
{
cmd.Parameters.Add(p);
}
}
count += cmd.ExecuteNonQuery();
}
trans.Commit();
return true;
}
catch (Exception ex)
{
trans.Rollback();
throw new Exception("执行事务出现异常", ex);
}
}
}
//public static T ExecuteSql<T>(string sql, int cmdType, DbParameter[] paras, Func<IDbCommand, T> action)
//{
// using (DbConnection conn = new SqlConnection(connStr))
// {
// conn.Open();
// IDbCommand cmd = conn.CreateCommand();
// cmd.CommandText = sql;
// if (cmdType==2)
// cmd.CommandType = CommandType.StoredProcedure;
// return action(cmd);
// }
//}
/// <summary>
/// 比如添加一个商品表的同时，相关联的要更新其他表中的商品信息的时候，用这种方法
/// </summary>
/// <typeparam name="T">委托类型：要执行的操作当做参数</typeparam>
/// <param name="action"></param>
/// <returns></returns>
public static T ExecuteTrans<T>(Func<IDbCommand, T> action)
{
using (IDbConnection conn = new SqlConnection(connStr))
{
conn.Open();
IDbTransaction trans = conn.BeginTransaction();
IDbCommand cmd = conn.CreateCommand();
cmd.Transaction = trans;
return action(cmd);
}
}
/// <summary>
/// 构建SqlCommand
/// </summary>
/// <param name="conn">数据库连接对象</param>
/// <param name="sql">SQL语句或存储过程</param>
/// <param name="comType">命令字符串的类型</param>
/// <param name="trans">事务</param>
/// <param name="paras">参数数组</param>
/// <returns></returns>
private static SqlCommand BuilderCommand(SqlConnection conn, string sql, int cmdType, SqlTransaction trans,params SqlParameter[] paras)
{
if (conn == null) throw new ArgumentNullException("连接对象不能为空！");
SqlCommand command = new SqlCommand(sql, conn);
if (cmdType==2)
command.CommandType = CommandType.StoredProcedure;
if (conn.State == ConnectionState.Closed)
conn.Open();
if (trans != null)
command.Transaction = trans;
if (paras != null && paras.Length > 0)
{
command.Parameters.Clear();
command.Parameters.AddRange(paras);
}
return command;
}
}
}
2，与数据库访问类中有关的事务操作的封装类：
namespace PM.DAL.Helper
{
/// <summary>
/// 事务一系列操作中的一个操作封装类
/// </summary>
public class CommandInfo
{
public string CommandText;//sql或存储过程名
public DbParameter[] Paras; //参数列表
public bool IsProc; //是否是存储过程
public CommandInfo()
{
}
public CommandInfo(string comText, bool isProc)
{
this.CommandText = comText;
this.IsProc = isProc;
}
public CommandInfo(string sqlText, bool isProc, DbParameter[] para)
{
this.CommandText = sqlText;
this.Paras = para;
this.IsProc = isProc;
}
}
}
3，数据库的配置文件
<connectionStrings>
<add name ="connStr" connectionString ="server=.;database=RightDBase;uid=sa;pwd=123;" providerName="System.Data.SqlClient"/>
</connectionStrings>
四，通用类：字符串通用操作，类型转换等
namespace PM.Common
{
public static class StringHelper
{
/// <summary>
/// 将数字字符串转换为int
/// </summary>
/// <param name="strValue"></param>
/// <returns></returns>
public static int GetInt(this string strValue)
{
int reInt = 0;
int.TryParse(strValue, out reInt);
return reInt;
}
public static decimal GetDecimal(this string strValue)
{
decimal reInt = 0;
decimal.TryParse(strValue, out reInt);
return reInt;
}
public static int GetInt(this object oValue)
{
int reInt = 0;
try
{
reInt = Convert.ToInt32(oValue);
}
catch
{
reInt = 0;
}
return reInt;
}
/// <summary>
/// 把字符串按照分隔符转换成 List
/// </summary>
/// <param name="str">源字符串</param>
/// <param name="speater">分隔符</param>
/// <param name="toLower">是否转换为小写</param>
/// <returns></returns>
public static List<string> GetStrList(this string str, char speater, bool toLower)
{
List<string> list = new List<string>();
string[] ss = str.Split(speater);
foreach (string s in ss)
{
if (!string.IsNullOrEmpty(s) && s != speater.ToString())
{
string strVal = s;
if (toLower)
{
strVal = s.ToLower();
}
list.Add(strVal);
}
}
return list;
}
/// <summary>
/// 把字符串转 按照, 分割 换为数据
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string[] GetStrArray(this string str)
{
return str.Split(new Char[] { ',' });
}
/// <summary>
/// 把 List<string> 按照分隔符组装成 string
/// </summary>
/// <param name="list"></param>
/// <param name="speater"></param>
/// <returns></returns>
public static string GetListStrToString(this List<string> list, string speater)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < list.Count; i++)
{
if (i == list.Count - 1)
{
sb.Append(list[i]);
}
else
{
sb.Append(list[i]);
sb.Append(speater);
}
}
return sb.ToString();
}
/// <summary>
/// 得到数组列表以逗号分隔的字符串
/// </summary>
/// <param name="list"></param>
/// <returns></returns>
public static string GetListToStr(this List<int> list)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < list.Count; i++)
{
if (i == list.Count - 1)
{
sb.Append(list[i].ToString());
}
else
{
sb.Append(list[i]);
sb.Append(",");
}
}
return sb.ToString();
}
/// <summary>
/// 得到数组列表以逗号分隔的字符串
/// </summary>
/// <param name="list"></param>
/// <returns></returns>
public static string GetArrayValueStr(this Dictionary<int, int> list)
{
StringBuilder sb = new StringBuilder();
foreach (KeyValuePair<int, int> kvp in list)
{
sb.Append(kvp.Value + ",");
}
if (list.Count > 0)
{
return DelLastComma(sb.ToString());
}
else
{
return "";
}
}
#region 删除最后一个字符之后的字符
/// <summary>
/// 删除最后结尾的一个逗号
/// </summary>
public static string DelLastComma(this string str)
{
return str.Substring(0, str.LastIndexOf(","));
}
/// <summary>
/// 删除最后结尾的指定字符后的字符
/// </summary>
public static string DelLastChar(this string str, string strchar)
{
return str.Substring(0, str.LastIndexOf(strchar));
}
#endregion
/// <summary>
/// 把字符串按照指定分隔符装成 List 去除重复
/// </summary>
/// <param name="o_str"></param>
/// <param name="sepeater"></param>
/// <returns></returns>
public static List<string> GetSubStringList(string o_str, char sepeater)
{
List<string> list = new List<string>();
string[] ss = o_str.Split(sepeater);
foreach (string s in ss)
{
if (!string.IsNullOrEmpty(s) && s != sepeater.ToString())
{
list.Add(s);
}
}
return list;
}
#region 得到字符串长度，一个汉字长度为2
/// <summary>
/// 得到字符串长度，一个汉字长度为2
/// </summary>
/// <param name="inputString">参数字符串</param>
/// <returns></returns>
public static int StrLength(string inputString)
{
System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();
int tempLen = 0;
byte[] s = ascii.GetBytes(inputString);
for (int i = 0; i < s.Length; i++)
{
if ((int)s[i] == 63)
tempLen += 2;
else
tempLen += 1;
}
return tempLen;
}
#endregion
#region 截取指定长度字符串
/// <summary>
/// 截取指定长度字符串
/// </summary>
/// <param name="inputString">要处理的字符串</param>
/// <param name="len">指定长度</param>
/// <returns>返回处理后的字符串</returns>
public static string ClipString(string inputString, int len)
{
bool isShowFix = false;
if (len % 2 == 1)
{
isShowFix = true;
len--;
}
System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();
int tempLen = 0;
string tempString = "";
byte[] s = ascii.GetBytes(inputString);
for (int i = 0; i < s.Length; i++)
{
if ((int)s[i] == 63)
tempLen += 2;
else
tempLen += 1;
try
{
tempString += inputString.Substring(i, 1);
}
catch
{
break;
}
if (tempLen > len)
break;
}
byte[] mybyte = System.Text.Encoding.Default.GetBytes(inputString);
if (isShowFix && mybyte.Length > len)
tempString += "…";
return tempString;
}
#endregion
public static string StringTrim(this string str)
{
return str.Trim();
}
}
}
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