Serial Port Complete - Latest Microcontroller projects

Managing Ports and Transfers in .NET

Events provide a way to pass data and event notifications between modules

while requiring only loose coupling between modules. The module that raises

the event doesn’t have to know anything about a module that handles the event.

The module that raises the event just makes the event and its parameters avail-

able to any module that wants to receive data or take other action when the

event is raised. On being notified of an event, a module can run a routine that

accepts passed data and performs any other actions as needed.

For example, a ComPorts class can declare an event that passes text to a form

module:

 Friend Shared Event UserInterfaceData (ByVal textToAdd As String)

 internal delegate void UserInterfaceDataEventHandler(string textToAdd);

internal static event UserInterfaceDataEventHandler UserInterfaceData;

A routine that reads data from the port can raise the event:

 Dim newReceivedData As String

' Get data from the COM port.

newReceivedData = selectedPort.ReadExisting

' Raise the event to make the data available to other modules.

RaiseEvent UserInterfaceData(newReceivedData)

 string newReceivedData = null;

// Get data from the COM port.

newReceivedData = SelectedPort.ReadExisting();

// Raise the event to make the data available to other modules.

if (null != UserInterfaceData)

{

UserInterfaceData(newReceivedData);

}

To receive the data, the form’s module specifies a routine to execute when the

event occurs. The routine must have the same type and number of parameters