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几个强大的工具类,不看你得后悔咯

时间:2016-03-30 19:43:04      阅读:719      评论:0      收藏:0      [点我收藏+]

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SqlHelper类

作用:充当一个助人为乐的角色。这个类呢,任何类都可以调用。例如:数据的“增, 删, 改 ,查”,数据库的链接,等等。

这个类是静态类,只要用类名.方法名(),就可以使用该方法的功能了。

//与数据交互的方法
    public static class SQLHelper
    {
        //创建静态方法,方便调用
        //配置文件
        public static string str = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
       // public static string str = "data source=.;initial catalog=myschool;uid=sa;pwd=123";
        //执行NonQuery命令
       public static int ExecuteNonQuery(string cmdTxt, params SqlParameter[] parames)
        {
            return ExecuteNonQuery(cmdTxt, CommandType.Text, parames);
        }
        //可以使用存储过程的ExecuteNonQuery
        public static int ExecuteNonQuery(string cmdTxt, CommandType commandType, params SqlParameter[] parames)
        {
            //判断脚本是否为空,直接返回0
            if (string.IsNullOrEmpty(cmdTxt))
            {
                return 0;
            }
            using (SqlConnection con = new SqlConnection(str))
            {
                using (SqlCommand cmd = new SqlCommand(cmdTxt, con))
                {
                    if (parames != null)
                    {
                        cmd.CommandText = cmdTxt;
                        cmd.Parameters.AddRange(parames);
                    }
                    con.Open();
                    return cmd.ExecuteNonQuery();
                }
            }
        }
        public static SqlDataReader ExecuteDataReader(string cmdTxt, params SqlParameter[] parames)
        {
            return ExecuteDataReader(cmdTxt, CommandType.Text, parames);
        }
        //SQLDataReader存储过程方法
        public static SqlDataReader ExecuteDataReader(string cmdTxt, CommandType commandType, params SqlParameter[] parames)
        {
            if (string.IsNullOrEmpty(cmdTxt))
            {
                return null;
            }
            SqlConnection con = new SqlConnection(str);
            using (SqlCommand cmd = new SqlCommand(cmdTxt, con))
            {
                cmd.CommandType = commandType;
                if (parames != null)
                {
                    cmd.Parameters.AddRange(parames);
                }
                con.Open();
                //把reader的行为加进来。当reader释放资源的时候,con也被一块关闭
                return cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
            }
        }
        public static DataTable ExecuteDataTable(string sql, params SqlParameter[] parames)
        {
            return ExecuteDataTable(sql, CommandType.Text, parames);
        }
        //调用存储过程的类,关于(ExecuteDataTable)
        public static DataTable ExecuteDataTable(string sql, CommandType commandType, SqlParameter[] parames)
        {
            if (string.IsNullOrEmpty(sql))
            {
                return null;
            }
            DataTable dt = new DataTable();
            using (SqlDataAdapter da = new SqlDataAdapter(sql, str))
            {
                da.SelectCommand.CommandType = commandType;
                if (parames != null)
                {
                    da.SelectCommand.Parameters.AddRange(parames);
                }
                da.Fill(dt);
                return dt;
            }
        }
        /// <summary>
        /// ExecuteScalar
        /// </summary>
        /// <param name="cmdTxt">第一个参数,SQLServer语句</param>
        /// <param name="parames">第二个参数,传递0个或者多个参数</param>
        /// <returns></returns>
        /// 
        public static object ExecuteScalar(string cmdTxt, params SqlParameter[] parames)
        {
            return ExecuteScalar(cmdTxt, CommandType.Text, parames);
        }
        //可使用存储过程的ExecuteScalar
        public static object ExecuteScalar(string cmdTxt, CommandType commandType, SqlParameter[] parames)
        {
            if (string.IsNullOrEmpty(cmdTxt))
            {
                return null;
            }
            using (SqlConnection con = new SqlConnection(str))
            {
                using (SqlCommand cmd = new SqlCommand(cmdTxt, con))
                {
                    cmd.CommandType = commandType;
                    if (parames != null)
                    {
                        cmd.Parameters.AddRange(parames);
                    }
                    con.Open();
                    return cmd.ExecuteScalar();
                }
            }
        }
        //调用存储过程的DBHelper类(关于ExeceutScalar,包含事务,只能处理Int类型,返回错误号)
        public static object ExecuteScalar(string cmdTxt, CommandType commandType, SqlTransaction sqltran, SqlParameter[] parames)
        {
            if (string.IsNullOrEmpty(cmdTxt))
            {
                return 0;
            }
            using (SqlConnection con = new SqlConnection(str))
            {
                int sum = 0;
                using (SqlCommand cmd = new SqlCommand(cmdTxt, con))
                {
                    cmd.CommandType = commandType;
                    if (parames != null)
                    {
                        cmd.Parameters.AddRange(parames);
                    }
                    con.Open();
                    sqltran = con.BeginTransaction();
                    try
                    {
                        cmd.Transaction = sqltran;
                        sum = Convert.ToInt32(cmd.ExecuteScalar());
                        sqltran.Commit();
                    }
                    catch (SqlException ex)
                    {

                        sqltran.Rollback();
                    }
                    return sum;
                }
            }
        }      
    }
}
MyTool类

作用:简化代码,提高性能,提高运行效率。

string sql = "select * from grade";
DataTable dt = SQLHelper.ExecuteDataTable(sql);

MyTool tool=new MyTool();
List<Grade> list=tool.DataTableToList<Grade>(dt);

相当于foreach循环

上面四行代码相当于下面十行代码

List<Grade> list = new List<Grade>();
string sql = "select * from grade";
DataTable dt = SQLHelper.ExecuteDataTable(sql);

//将dt转成List<Student>
foreach (DataRow row in dt.Rows)
{
 //每一个row代表表中的一行 所以 一行对应一个年级对象

 Grade grade = new Grade();
 grade.GradeId = Convert.ToInt32(row["gradeid"]);
 grade.GradeName = row["gradename"].ToString();
 list.Add(grade);
}

public class MyTool
    {
        /// <summary>
        /// DataSetToList
        /// </summary>
        /// <typeparam name="T">转换类型</typeparam>
        /// <param name="dataSet">数据源</param>
        /// <param name="tableIndex">需要转换表的索引</param>
        /// <returns></returns>
        public List<T> DataTableToList<T>(DataTable dt)
        {
            //确认参数有效
            if (dt == null )
                return null;
            List<T> list = new List<T>();
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                //创建泛型对象
                T _t = Activator.CreateInstance<T>();
                //获取对象所有属性
                PropertyInfo[] propertyInfo = _t.GetType().GetProperties();
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    foreach (PropertyInfo info in propertyInfo)
                    {
                        //属性名称和列名相同时赋值
                        if (dt.Columns[j].ColumnName.ToUpper().Equals(info.Name.ToUpper()))
                        {
                            if (dt.Rows[i][j] != DBNull.Value)
                            {
                                info.SetValue(_t, dt.Rows[i][j], null);
                            }
                            else
                            {
                                info.SetValue(_t, null, null);
                            }
                            break;
                        }
                    }
                }
                list.Add(_t);
            }
            return list;
        }
    }
}

MsgDiv类

作用:该类相当于一个控件。我们知道有这么TextBox控件,及文本框。

但是有时候我们需要美化文字,所以就要用MsgDiv控件。而且该控件还有一个特别的作用:计时器,

就是有时间的延长,即当你运行一个窗体时,你不想马上就要看到

该窗体,所以呢,可以用该控件设置时间 的延续,已达到效果。

首先你把这个类放项目窗体下面。

效果图:

技术分享

技术分享

技术分享

/// <summary>
/// 消息条回调函数委托
/// </summary>
public delegate void DGMsgDiv();
    /// <summary>
    /// 消息条类 带Timer计时
    /// </summary>
public class MsgDiv : System.Windows.Forms.Label
{
    private Timer timerLable = new Timer();
    /// <summary>
    /// 消息回调 委托对象
    /// </summary>
    private DGMsgDiv dgCallBack = null;

    #region 计时器
    /// <summary>
    /// 计时器
    /// </summary>
    public Timer TimerMsg
    {
        get { return timerLable; }
        set { timerLable = value; }
    } 
    #endregion

    #region  MsgDiv构造函数
    /// <summary>
    /// MsgDiv构造函数
    /// </summary>
    public MsgDiv()
    {
        InitallMsgDiv(7, 7);
    }

    /// <summary>
    /// MsgDiv构造函数
    /// </summary>
    /// <param name="x">定位x轴坐标</param>
    /// <param name="y">定位y轴坐标</param>
    public MsgDiv(int x, int y)
    {
        InitallMsgDiv(x, y);
    }
    #endregion

    #region  初始化消息条
    /// <summary>
    /// 初始化消息条
    /// </summary>
    private void InitallMsgDiv(int x, int y)
    {
        this.AutoSize = true;
        this.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(255)))), ((int)(((byte)(192)))));
        this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
        //this.ContextMenuStrip = this.cmsList;
        this.Font = new System.Drawing.Font("宋体", 11F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
        this.ForeColor = System.Drawing.Color.Red;
        this.Location = new System.Drawing.Point(x, y);
        this.MaximumSize = new System.Drawing.Size(980, 525);
        this.Name = "msgDIV";
        this.Padding = new System.Windows.Forms.Padding(7);
        this.Size = new System.Drawing.Size(71, 31);
        this.TabIndex = 1;
        this.Text = "消息条";
        this.Visible = false;
        //给委托添加事件
        this.DoubleClick += new System.EventHandler(this.msgDIV_DoubleClick);
        this.MouseLeave += new System.EventHandler(this.msgDIV_MouseLeave);
        this.MouseHover += new System.EventHandler(this.msgDIV_MouseHover);
        this.timerLable.Interval = 1000;
        this.timerLable.Tick += new System.EventHandler(this.timerLable_Tick);
    }
    #endregion

    #region 将消息条添加到指定容器上
    /// <summary>
    /// 将消息条添加到指定容器上Form
    /// </summary>
    /// <param name="form"></param>
    public void AddToControl(Form form)
    {
        form.Controls.Add(this);
    }
    /// <summary>
    /// 将消息条添加到指定容器上GroupBox
    /// </summary>
    /// <param name="form"></param>
    public void AddToControl(GroupBox groupBox)
    {
        groupBox.Controls.Add(this);
    }
    /// <summary>
    /// 将消息条添加到指定容器上Panel
    /// </summary>
    /// <param name="form"></param>
    public void AddToControl(Panel panel)
    {
        panel.Controls.Add(this);
    }
    #endregion

    //---------------------------------------------------------------------------
    #region 消息显示 的相关参数们 hiddenClick,countNumber,constCountNumber
    /// <summary>
    /// 当前显示了多久的秒钟数
    /// </summary>
    int hiddenClick = 0;
    /// <summary>
    /// 要显示多久的秒钟数 可变参数
    /// </summary>
    int countNumber = 3;
    /// <summary>
    /// 要显示多久的秒钟数 固定参数
    /// </summary>
    int constCountNumber = 3; 
    #endregion

    #region 计时器 显示countNumber秒钟后自动隐藏div -timerLable_Tick(object sender, EventArgs e)
    private void timerLable_Tick(object sender, EventArgs e)
    {
        if (hiddenClick > countNumber - 2)
        {
            MsgDivHidden();
        }
        else
        {
            hiddenClick++;
            //RemainCount();
        }
    } 
    #endregion

    #region 隐藏消息框 并停止计时 +void MsgDivHidden()
    /// <summary>
    /// 隐藏消息框 并停止计时
    /// </summary>
    public void MsgDivHidden()
    {
        this.Text = "";
        this.Visible = false;
        this.hiddenClick = 0;
        //this.tslblRemainSecond.Text = "";
        if (this.timerLable.Enabled == true)
            this.timerLable.Stop();

        //调用 委托 然后清空委托
        if (dgCallBack != null && dgCallBack.GetInvocationList().Length > 0)
        {
            dgCallBack();
            dgCallBack -= dgCallBack;
        }
    } 
    #endregion

    #region 在消息框中显示消息字符串 +void MsgDivShow(string msg)
    /// <summary>
    /// 在消息框中显示消息字符串
    /// </summary>
    /// <param name="msg">要显示的字符串</param>
    public void MsgDivShow(string msg)
    {
        this.Text = msg;
        this.Visible = true;
        this.countNumber = constCountNumber;//默认设置显示秒数为10;
        this.hiddenClick = 0;//重置倒数描述
        this.timerLable.Start();
    } 
    #endregion

    #region 在消息框中显示消息字符串 并在消息消失时 调用回调函数 +void MsgDivShow(string msg, DGMsgDiv callback)
    /// <summary>
    /// 在消息框中显示消息字符串 并在消息消失时 调用回调函数
    /// </summary>
    /// <param name="msg">要显示的字符串</param>
    /// <param name="callback">回调函数</param>
    public void MsgDivShow(string msg, DGMsgDiv callback)
    {
        MsgDivShow(msg);
        dgCallBack = callback;
    }
    #endregion

    #region 在消息框中显示消息字符串 并在指定时间消息消失时 调用回调函数 +void MsgDivShow(string msg, int seconds, DGMsgDiv callback)
    /// <summary>
    /// 在消息框中显示消息字符串 并在消息消失时 调用回调函数
    /// </summary>
    /// <param name="msg">要显示的字符串</param>
    /// <param name="seconds">消息显示时间</param>
    /// <param name="callback">回调函数</param>
    public void MsgDivShow(string msg, int seconds, DGMsgDiv callback)
    {
        MsgDivShow(msg, seconds);
        dgCallBack = callback;
    }  
    #endregion

    #region 在消息框中显示消息字符串,并指定消息框显示秒数 +void MsgDivShow(string msg, int seconds)
    /// <summary>
    /// 在消息框中显示消息字符串,并指定消息框显示秒数
    /// </summary>
    /// <param name="msg">要显示的字符串</param>
    /// <param name="seconds">消息框显示秒数</param>
    public void MsgDivShow(string msg, int seconds)
    {
        this.Text = msg;
        this.Visible = true;
        this.countNumber = seconds;
        this.hiddenClick = 0;//重置倒数描述
        this.timerLable.Start();
    } 
    #endregion

    //---------------------------------------------------------------------------
    #region 事件们~~~! msgDIV_MouseHover,msgDIV_MouseLeave,msgDIV_DoubleClick
    //当鼠标停留在div上时 停止计时
    private void msgDIV_MouseHover(object sender, EventArgs e)
    {
        if (this.timerLable.Enabled == true)
            this.timerLable.Stop();
    }
    //当鼠标从div上移开时 继续及时
    private void msgDIV_MouseLeave(object sender, EventArgs e)
    {
        //当消息框正在显示、回复框没显示、计时器正停止的时候,重新启动计时器
        if (this.Visible == true && this.timerLable.Enabled == false)
            this.timerLable.Start();
    }
    //双击消息框时关闭消息框
    private void msgDIV_DoubleClick(object sender, EventArgs e)
    {
        MsgDivHidden();
    } 
    #endregion

}

上面这三个类的代码,虽然是老师给的代码,但是都是经过本人认真写出来的,目的就是强化记忆。望对大家有帮助。

谢谢!

几个强大的工具类,不看你得后悔咯

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原文地址:http://www.cnblogs.com/whyhappy/p/5338394.html

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