protected override void OnStart(string[] args)
{
try
{
t.Enabled = true;
t.Interval = 10000; //60 * 24;
t.Elapsed += new System.Timers.ElapsedEventHandler(t_Elapsed);
}
catch (Exception ex)
{
writeErrorToFile(ex.Message + " -- (OnStart) --");
}
}
这是我的启动方法。我是制作Windows服务的新手。你能解释一下instart方法中的代码是什么吗？我用谷歌搜索时无法得到正确的答案。
以下是从onstart方法
调用的方法private void t_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
try
{
// Read Data from Excel
OleDbConnection conn = new OleDbConnection();
OleDbCommand cmd = new OleDbCommand();
OleDbDataAdapter da = new OleDbDataAdapter();
SqlCommand sm = new SqlCommand();
string connString = "";
string query = "";
string strDt = DateTime.Now.ToString("dd_MM_yyyy");
string strNewPath = @"E:\E-Cata_Stock_Report\ALL_INDIA_STOCK_REPORT_" + strDt + ".xls"; //Server.MapPath(@"C:\E-Cata_Stock_Report\ALL_INDIA_STOCK_REPORT.xls"); // ///" + strFileName + strFileType);
connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strNewPath +
";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
query = "SELECT * FROM [SPARE_LIST$]";
conn = new OleDbConnection(connString);
//Open connection
if (conn.State == ConnectionState.Open)
conn.Close();
conn.Open();
//Create the command object
cmd = new OleDbCommand(query, conn);
da = new OleDbDataAdapter(cmd);
dsExcel = new DataSet();
try
{
da.Fill(dsExcel);
}
catch (Exception ex)
{
writeErrorToFile(ex.Message + " -- (t_Elapsed -> Keep valid excel file which you want to upload..) --");
//lblMsg.Text = "Keep valid excel file which you want to upload..";
return;
}
//lblMsg.Text = "Data retrieved successfully! Total Records:" + dsExcel.Tables[0].Rows.Count;
da.Dispose();
conn.Close();
conn.Dispose();
if (dsExcel.Tables[0].Columns.Count != 32)
{
writeErrorToFile("Please check the Excel Sheet.. It contains more or less columns..");
return;
}
if (dsExcel.Tables[0].Rows.Count > 0)
{
for (int i = 0; i < dsExcel.Tables[0].Rows.Count; i++)
File.AppendAllText(@"C:\E-Cata_Itms.txt", dsExcel.Tables[0].Rows[i][0].ToString() + " \n\r"+i+i);
}
//======================================================================================================
string con = getConn_string();
SqlConnection sn = new SqlConnection(con);
if (sn.State == ConnectionState.Open)
sn.Close();
sn.Open();
SqlTransaction transaction = sn.BeginTransaction();
try
{
for (int j = 4; j < dsExcel.Tables[0].Rows.Count; j++) // for rows
{
for (int i = 2; i < 32; i++) //for coloumns
{
sm = new SqlCommand();
sm.Transaction = transaction;
sm.CommandText = "whItmItemwise_upload_update";
sm.Connection = sn;
sm.CommandType = CommandType.StoredProcedure;
sm.Parameters.AddWithValue("@whItm_wh_code", dsExcel.Tables[0].Rows[3][i].ToString().Trim());
sm.Parameters.AddWithValue("@whItm_item_code", dsExcel.Tables[0].Rows[j][0].ToString().Trim());
try
{
// open stock quantity
decimal op_qty = (dsExcel.Tables[0].Rows[j][i].ToString().Trim() ==
"")
? Convert.ToDecimal(0.0)
: Convert.ToDecimal(
dsExcel.Tables[0].Rows[j][i].ToString().Trim
());
sm.Parameters.AddWithValue("@whItm_OP_STK_Qty", op_qty);
}
catch (Exception ex)
{
writeErrorToFile(ex.Message + " -- (t_Elapsed -> Enter valid Open stock quantity..) --"+i);
return;
}
sm.Parameters.AddWithValue("@whItm_Creation_DT", DateTime.Now.ToString("yyyy/MM/dd"));
//sm.Parameters.AddWithValue("@whItm_Created_By", "");
//sm.Parameters.AddWithValue("@His_whItm_Modify_Del_DT", DateTime.Now.ToString("yyyy/MM/dd"));
//sm.Parameters.AddWithValue("@His_whItm_Modify_Del_By", "");
try
{
int x = sm.ExecuteNonQuery();
}
catch (Exception ex)
{
System.Text.StringBuilder str_Upload = new System.Text.StringBuilder();
str_Upload.Append(dsExcel.Tables[0].Rows[3][i].ToString().Trim() + ",");
str_Upload.Append(dsExcel.Tables[0].Rows[j][0].ToString().Trim() + ",");
str_Upload.Append(ex.Message.Replace(',', '-') + ",");
str_Upload.Append(DateTime.Now.ToString("dd/MM/yyyy") + ",");
File.AppendAllText(@"C:\E-Cata_Error" + ".csv", str_Upload.ToString());
}
sm.Parameters.Clear();
}
}
// Update stock from WH master to Item Master
SqlCommand sm2 = new SqlCommand();
sm2.Transaction = transaction;
sm2.CommandText = "Stock_Update_from_WH_to_Item_master";
sm2.Connection = sn;
sm2.CommandType = CommandType.StoredProcedure;
sm2.Parameters.AddWithValue("@Item_Code", "");
sm2.ExecuteNonQuery();
transaction.Commit();
sm2.Dispose();
MyNewService iyu = new MyNewService();
iyu.Stop();
}
catch (Exception ex)
{
transaction.Rollback();
writeErrorToFile(ex.Message+"abcd");
return;
}
finally
{
sm.Dispose();
transaction.Dispose();
sn.Close();
sn.Dispose();
}
//try
//{
// // delete uploaded file
// File.Delete(strNewPath);
//}
//catch (Exception)
//{
//}
}
catch (Exception ex)
{
writeErrorToFile(ex.Message + " -- (t_Elapsed) --"+"xyz");
}
}
答案 0 :(得分：1)
Windows服务必须从ServiceBase类继承。它具有我们需要在服务类中覆盖的OnStart和OnStop虚拟方法。
在您的代码中，启动Windows服务时，将调用OnStart方法。在此方法中，启用计时器并将间隔设置为10秒。定时器间隔始终以毫秒为单位，这就是值为10000的原因。当经过10秒后，在Elapsed事件中订阅的方法被触发，在这种情况下触发了t_Elapsed方法。
有关在托管Windows服务中托管wcf服务的信息，请参阅以下文章。
http://msdn.microsoft.com/en-us/library/ms733069.aspx