static void Main()
{
try
{
bool New;
Mutex instance = new Mutex(true, "大屏显示程序", out New);
if (New)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new LedFrm());
}
else
{
MessageBox.Show("已经启动了一个程序，请先退出！", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
Application.Exit();
}
}
catch (Exception ee)
{
ErrorWriter ew = new ErrorWriter();
ew.MonthErrorWriter(ee.StackTrace.ToString() + "||" + ee.Message.ToString());
}
}
/// <summary>
/// 通用查询
/// </summary>
/// <param name="sql">string sql</param>
/// <returns>DataTable</returns>
public static DataTable GetDataTable(string sql)
{
try
{
if (connection == "")
{
sqlconnection();
}
using (SqlConnection con = new SqlConnection(connection))
{
SqlDataAdapter sda = new SqlDataAdapter(sql, con);
DataTable dt = new DataTable();
sda.Fill(dt);
return dt;
}
}
catch (Exception ee)
{
ErrorWriter ew = new ErrorWriter();
ew.MonthErrorWriter(ee.StackTrace + "||" + ee.Message);
return null;
}
}