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本文实例为大家介绍了几个可用的类，供大家参考，具体内容如下
1.SQLHelper类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;
namespace MySchool.DAL
{
public static class SQLHelper
{
//用静态的方法调用的时候不用创建SQLHelper的实例
//Execetenonquery
// public static string Constr = "server=HAPPYPIG\\SQLMODEL;database=shooltest;uid=sa;";
public static string Constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
public static int id;
/// <summary>
/// 执行NonQuery命令
/// </summary>
/// <param name="cmdTxt"></param>
/// <param name="parames"></param>
/// <returns></returns>
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 cmdtype, 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(Constr))
{
using (SqlCommand cmd = new SqlCommand(cmdTxt, con))
{
if (parames != null)
{
cmd.CommandType = cmdtype;
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 cmdtype, params SqlParameter[] parames)
{
if (string.IsNullOrEmpty(cmdTxt))
{
return null;
}
SqlConnection con = new SqlConnection(Constr);
using (SqlCommand cmd = new SqlCommand(cmdTxt, con))
{
cmd.CommandType = cmdtype;
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 cmdType, params SqlParameter[] parames)
{
if (string.IsNullOrEmpty(sql))
{
return null;
}
DataTable dt = new DataTable();
using (SqlDataAdapter da = new SqlDataAdapter(sql, Constr))
{
da.SelectCommand.CommandType = cmdType;
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 cmdtype, params SqlParameter[] parames)
{
if (string.IsNullOrEmpty(cmdTxt))
{
return null;
}
using (SqlConnection con = new SqlConnection(Constr))
{
using (SqlCommand cmd = new SqlCommand(cmdTxt, con))
{
cmd.CommandType = cmdtype;
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 cmdtype,SqlTransaction sqltran, params SqlParameter[] parames)
{
if (string.IsNullOrEmpty(cmdTxt))
{
return 0;
}
using (SqlConnection con = new SqlConnection(Constr))
{
int sum = 0;
using (SqlCommand cmd = new SqlCommand(cmdTxt, con))
{
cmd.CommandType=cmdtype;
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;
}
}
}
}
}
</div>
例如：
//以返回表的方式加载下拉框
public DataTable LoadCombox()
{
string sql = "select * from Grade";
DataTable dt = SQLHelper.ExecuteDataTable(sql);
return dt;
}
</div>
2.MyTool类（DataTable转List<>）
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace MySchool.DAL
{
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;
}
}
}
</div>
例如：
public List<Grade> Loadcombox2()
{
string sql = "select * from Grade";
DataTable dt = SQLHelper.ExecuteDataTable(sql);
//方法一：
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);
}
//方法二：(使用MyTool类)
MyTool tool=new MyTool();
list = tool.DataTableToList<Grade>(dt);
return list;
}
</div>
3.DGMsgDiv类（可生成自己的控件）
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
/// <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>