XSharp now supports an extended Event syntax. Both a single line syntax is supported as a multi line:
Old style syntax
[Attributes] [Modifiers] EVENT [<ExplicitInterface>.] <Id> AS <Type> // Old Style
Single Line syntax with explicit expressions
[Attributes] [Modifiers] EVENT [<ExplicitInterface>.] <Id> AS <Type> [ADD <ExpressionList] [REMOVE <ExpressionList] // Single Line
Multi line syntax with explicit expressions
[Attributes] [Modifiers] EVENT [<ExplicitInterface>.] <Id> AS <Type> // Multi line
ADD
<Statements>
END [ADD]
REMOVE
<Statements>
END [REMOVE]
END [EVENT]
Example
USING System.Collections.Generic
FUNCTION Start AS VOID
LOCAL e AS EventsExample
e := EventsExample{}
e:Event1 += TestClass.DelegateMethod
e:Event1 += TestClass.DelegateMethod
e:Event1 -= TestClass.DelegateMethod // added 2, removed 1, should be called once
e:Event2 += TestClass.DelegateMethod
e:Event2 += TestClass.DelegateMethod
e:Event2 -= TestClass.DelegateMethod // added 2, removed 1, should be called once
e:Event3 += TestClass.DelegateMethod
e:RaiseEvent1("This is a test through a multi line event definition")
e:RaiseEvent2("This is a test through a single line event definition")
e:RaiseEvent3("This is a test through an old style event definition")
Console.WriteLine("Press a Key")
Console.ReadLine()
DELEGATE EventHandler (s AS STRING) AS VOID
CLASS TestClass
STATIC METHOD DelegateMethod(s AS STRING ) AS VOID
Console.WriteLine( s)
END CLASS
CLASS EventsExample
PRIVATE eventsTable AS Dictionary<STRING, System.Delegate>
PRIVATE CONST sEvent1 := "Event1" AS STRING
PRIVATE CONST sEvent2 := "Event2" AS STRING
CONSTRUCTOR()
eventsTable := Dictionary<STRING, System.Delegate>{}
eventsTable:Add(sEvent1,NULL_OBJECT)
eventsTable:Add(sEvent2,NULL_OBJECT)
// Multiline definition
EVENT Event1 AS EventHandler
ADD
BEGIN LOCK eventsTable
eventsTable[sEvent1] := ((EventHandler) eventsTable[sEvent1]) + value
END LOCK
Console.WriteLine(__ENTITY__ + " "+value:ToString())
END
REMOVE
BEGIN LOCK eventsTable
eventsTable[sEvent1] := ((EventHandler) eventsTable[sEvent1]) - value
END LOCK
Console.WriteLine(__ENTITY__+ " "+value:ToString())
END
END EVENT
// Single Line defintion on multilpe lines with semi colons, for better reading !
EVENT Event2 AS EventHandler ;
ADD eventsTable[sEvent2] := ((EventHandler) eventsTable[sEvent2]) + value ;
REMOVE eventsTable[sEvent2] := ((EventHandler) eventsTable[sEvent2]) - value
// Old style definition
EVENT Event3 AS EventHandler
METHOD RaiseEvent1(s AS STRING) AS VOID
VAR handler := (EventHandler) eventsTable[sEvent1]
IF handler != NULL
handler(s)
ENDIF
METHOD RaiseEvent2(s AS STRING) AS VOID
VAR handler := (EventHandler) eventsTable[sEvent2]
IF handler != NULL
handler(s)
ENDIF
METHOD RaiseEvent3(s AS STRING) AS VOID
IF SELF:Event3 != NULL
Event3(s)
ENDIF
END CLASS
