TransactionStateChangeEventArgs Class

In This Topic

Base class for TransactionStateChangedEventArgs and TransactionStateChangingEventArgs classes.

Syntax

Visual Basic
C#

'Declaration
 
Public MustInherit Class TransactionStateChangeEventArgs 
   Inherits System.EventArgs

public abstract class TransactionStateChangeEventArgs : System.EventArgs

Example

This sample demonstrates how the common base TransactionStateChangeEventArgs class for TransactionStateChanged and TransactionStateChanging envent arguments allows using more general code.

csharp

PgSqlConnection connection = new PgSqlConnection(
    "host=server;database=test;user id=postgres;");
   connection.TransactionStateChanged += new TransactionStateChangedEventHandler(connection_TransactionStateChange);
   connection.TransactionStateChanging += new TransactionStateChangingEventHandler(connection_TransactionStateChange);
   connection.Open();
   // ...
PgSqlTransaction transaction = connection.BeginTransaction();
   // ...
   transaction.Commit();
   // ...

void connection_TransactionStateChange(object sender, TransactionStateChangeEventArgs e) {

        // common actions that must be done before and after the transaction state change
        // ...

        if (e is TransactionStateChangingEventArgs) {
                // actions before the transaction state change
                // ...
        }
        else { // e is TransactionStateChangedEventArgs
                // actions after the transaction state change
                // ...
        }
}

Visual Basic

Dim connection As New PgSqlConnection( _
    "host=server;database=test;user id=postgres;")
AddHandler connection.TransactionStateChanged, New TransactionStateChangedEventHandler(AddressOf &_ Me.connection_TransactionStateChange)
        AddHandler connection.TransactionStateChanging, New TransactionStateChangingEventHandler(AddressOf &_ Me.connection_TransactionStateChange)
        connection.Open()
        ' ...
        Dim Transaction As OracleTransaction
        Transaction = connection.BeginTransaction()
        ' ...
        Transaction.Commit()
        ' ...

        Private Sub connection_TransactionStateChange(ByVal sender As Object, ByVal e As TransactionStateChangeEventArgs)
        ' common actions that must be done before and after the transaction state change
        '...
        If TypeOf e Is TransactionStateChangingEventArgs Then
                ' actions before the transaction state change
                ' ...
        Else ' e is TransactionStateChangedEventArgs
                ' actions after the transaction state change
                ' ...
        End If
End Sub

Inheritance Hierarchy

System.Object
   System.EventArgs
      Devart.Common.TransactionStateChangeEventArgs
         Devart.Common.TransactionStateChangedEventArgs
         Devart.Common.TransactionStateChangingEventArgs

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

TransactionStateChangeEventArgs Members
Devart.Common Namespace

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