EnterpriceServices

业务层：

业务层
 1using System;
 2using System.EnterpriseServices;
 3
 4using MyBusiness.Personnel;
 5using MyBusiness.Orders;
 6
 7
 8[assembly: ApplicationName("MyBusiness.Administration")]
 9[assembly: ApplicationActivation(ActivationOption.Library)]
10
11namespace MyBusiness.Administration
12{
13    /**//// <summary>
14    /// Epmployee Administration Object
15    /// </summary>
16     
17    [ Transaction(TransactionOption.RequiresNew) ]
18    [ ObjectPooling(true, 5, 10) ]
19    public class EmployeeMaintenance : ServicedComponent
20    {
21        public EmployeeMaintenance()
22        {
23        }
24
25        [ AutoComplete(true) ]
26        public void AddEmployee(string Name, string Address, int JobType, bool bMakePayrollFail, bool bMakeOrdersFail)
27        {
28            // Create out tier 3 of 4 components that act as the data access layer.
29            PayrollMaintenance payroll_maintenance = new PayrollMaintenance();
30            OrdersMaintenance orders_maintenance = new OrdersMaintenance();
31
32            // Some business LogicNames must always be stored in upcase!
33            Name = Name.ToUpper();
34
35            // Let the tier 3 of 4 access the seperate databases and store 
36            // our complex business information.
37            payroll_maintenance.AddEmployee(Name, Address, JobType, bMakePayrollFail);
38            orders_maintenance.SetupUser(Name, JobType, bMakeOrdersFail);
39        }
40    }
41}
42

DAL层：

Orders类DAL
 1using System;
 2using System.Data;
 3using System.Data.SqlClient;
 4using System.EnterpriseServices;
 5
 6[assembly: ApplicationName("MyBusiness.Orders")]
 7[assembly: ApplicationActivation(ActivationOption.Library)]
 8
 9namespace MyBusiness.Orders
10{
11    /**//// <summary>
12    /// Orders Specific Mainenance Object
13    /// </summary>
14    [ Transaction(TransactionOption.Required) ]
15    [ ObjectPooling(true, 5, 10) ]
16    public class OrdersMaintenance : ServicedComponent
17    {
18        public OrdersMaintenance()
19        {
20        }
21
22        [ AutoComplete(true) ]
23        public void SetupUser(string Name, int JobType, bool MakeFail)
24        {
25            string sConnection = "Persist Security Info=false;Data Source=192.168.0.98;Initial Catalog=MyOrdersDB;User ID=sa;Password=100200;";
26            SqlConnection cnn= new SqlConnection(sConnection);
27
28            // Open the Database Connection
29            cnn.Open();
30
31            DataSet ds = new DataSet();
32            DataRow dr;
33            SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM tblOrderUser", cnn);
34            SqlCommandBuilder cb = new SqlCommandBuilder(da);
35
36            // Tell it we want Primary and index keys.
37            da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
38
39            // Load the table from the database.
40            // This will become slow very quickly, so not a great design,
41            // but it does demonstrate the reading and writing of data.
42            da.Fill(ds, "tblOrderUser");
43
44            dr = ds.Tables["tblOrderUser"].NewRow();
45
46            dr["sName"] = Name;
47            dr["nJobType"] = JobType;
48            dr["sTransactionActivityID"] = ContextUtil.ActivityId;
49            dr["sTransactionContextID"] = ContextUtil.ContextId;
50
51            ds.Tables["tblOrderUser"].Rows.Add(dr);
52
53            da.Update(ds, "tblOrderUser");
54
55            // Close the Database Connection
56            cnn.Close();
57
58            if(MakeFail)
59            {
60                // Oh no!!! Its all gone horibly wrong.
61                throw new Exception("User requested Exception in PayrollMaintenance.AddEmployee");
62            }
63        }
64    }
65}
66

Person类DAL
 1using System;
 2using System.Data;
 3using System.Data.SqlClient;
 4using System.EnterpriseServices;
 5
 6[assembly: ApplicationName("MyBusiness.Personnel")]
 7[assembly: ApplicationActivation(ActivationOption.Library)]
 8
 9namespace MyBusiness.Personnel
10{
11    /**//// <summary>
12    /// Payroll Specific Mainenance Object
13    /// </summary>
14    [ Transaction(TransactionOption.Required) ]
15    [ ObjectPooling(true, 5, 10) ]
16    public class PayrollMaintenance : ServicedComponent
17    {
18        public PayrollMaintenance ()
19        {
20        }
21
22        public void AddEmployee(string Name, string Address, int JobType, bool MakeFail)
23        {
24            string sConnection = "Persist Security Info=false;Data Source=192.168.0.98;Initial Catalog=MyPersonnelDB;User ID=sa;Password=100200;";
25            SqlConnection cnn= new SqlConnection(sConnection);
26
27            // Open the Database Connection
28            cnn.Open();
29
30            DataSet ds = new DataSet();
31            DataRow dr;
32            SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM tblEmployees", cnn);
33            SqlCommandBuilder cb = new SqlCommandBuilder(da);
34
35            // Tell it we want Primary and index keys.
36            da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
37
38            // Load the table from the database.
39            // This will become slow very quickly, so not a great design,
40            // but it does demonstrate the reading and writing of data.
41            da.Fill(ds, "tblEmployees");
42
43            dr = ds.Tables["tblEmployees"].NewRow();
44
45            dr["sName"] = Name; ;
46            dr["sAddress"] = Address;
47            dr["nJobType"] = JobType;
48            dr["sTransactionActivityID"] = ContextUtil.ActivityId;
49            dr["sTransactionContextID"] = ContextUtil.ContextId;
50
51            ds.Tables["tblEmployees"].Rows.Add(dr);
52
53            da.Update(ds, "tblEmployees");
54
55            // Close the Database Connection
56            cnn.Close();
57
58            if(MakeFail)
59            {
60                // Oh no!!! Its all gone horibly wrong.
61                throw new Exception("User requested Exception in PayrollMaintenance.AddEmployee");
62            }
63        }
64    }
65}
66

客户：

客户代码
 1EmployeeMaintenance employee_maintenance = new EmployeeMaintenance();
 2
 3            // Its a one function wonder, but we could call a few. The
 4            // transaction would succeed as long as they all voted yes.
 5            // Remeber the transaction state lived with the life of the
 6            // object and the transaction is commited or rolled back 
 7            // when it goes out of scope.
 8
 9            try
10            {
11
12                employee_maintenance.AddEmployee
13                    (
14                    txtEmployee.Text, 
15                    txtAddress.Text, 
16                    Convert.ToInt32(txtJobType.Text), 
17                    cbExceptionPersonnel.Checked, 
18                    cbExceptionOrders.Checked
19                    );
20
21            }
22            catch(Exception ex)
23            {
24                string sMessage = "The transaction threw the follwing Exception:\n\n";
25                
26                sMessage += ex.Message + "\n";
27                sMessage += ex.Source + "\n";
28                sMessage += "\nThe transaction will be rolled back.";
29
30                MessageBox.Show(sMessage, "Unhandled Exeption");
31
32                throw ex;
33            }