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|
Imports System
Imports System.Reflection
Imports System.IO
Imports System.CodeDom
Imports System.CodeDom.Compiler
Imports Microsoft.VisualBasic
' This code example creates a graph using a CodeCompileUnit and
' generates source code for the graph using the VBCodeProvider.
Class Sample
' Define the compile unit to use for code generation.
Private targetUnit As CodeCompileUnit
' The only class in the compile unit. This class contains 2 fields,
' 3 properties, a constructor, an entry point, and 1 simple method.
Private targetClass As CodeTypeDeclaration
' The name of the file to contain the source code.
Private Const outputFileName As String = "SampleCode.vb"
' Define the class.
Public Sub New()
targetUnit = New CodeCompileUnit()
Dim samples As New CodeNamespace("CodeDOMSample")
samples.Imports.Add(New CodeNamespaceImport("System"))
'voici le nom du type !!!!
targetClass = New CodeTypeDeclaration("CodeDOMCreatedClass")
targetClass.IsClass = True
targetClass.TypeAttributes = _
TypeAttributes.Public Or TypeAttributes.Sealed
samples.Types.Add(targetClass)
targetUnit.Namespaces.Add(samples)
End Sub 'New
' Adds two fields to the class.
Public Sub AddFields()
' Declare the widthValue field.
Dim widthValueField As New CodeMemberField()
widthValueField.Attributes = MemberAttributes.Private
widthValueField.Name = "widthValue"
widthValueField.Type = _
New CodeTypeReference(GetType(System.Double))
widthValueField.Comments.Add(New CodeCommentStatement( _
"The width of the object."))
targetClass.Members.Add(widthValueField)
' Declare the heightValue field
Dim heightValueField As New CodeMemberField()
heightValueField.Attributes = MemberAttributes.Private
heightValueField.Name = "heightValue"
heightValueField.Type = _
New CodeTypeReference(GetType(System.Double))
heightValueField.Comments.Add(New CodeCommentStatement( _
"The height of the object."))
targetClass.Members.Add(heightValueField)
End Sub 'AddFields
' Add three properties to the class.
Public Sub AddProperties()
' Declare the read only Width property.
Dim widthProperty As New CodeMemberProperty()
widthProperty.Attributes = _
MemberAttributes.Public Or MemberAttributes.Final
widthProperty.Name = "Width"
widthProperty.HasGet = True
widthProperty.Type = New CodeTypeReference(GetType(System.Double))
widthProperty.Comments.Add(New CodeCommentStatement( _
"The width property for the object."))
widthProperty.GetStatements.Add(New CodeMethodReturnStatement( _
New CodeFieldReferenceExpression( _
New CodeThisReferenceExpression(), "widthValue")))
targetClass.Members.Add(widthProperty)
' Declare the read-only Height property.
Dim heightProperty As New CodeMemberProperty()
heightProperty.Attributes = _
MemberAttributes.Public Or MemberAttributes.Final
heightProperty.Name = "Height"
heightProperty.HasGet = True
heightProperty.Type = New CodeTypeReference(GetType(System.Double))
heightProperty.Comments.Add(New CodeCommentStatement( _
"The Height property for the object."))
heightProperty.GetStatements.Add(New CodeMethodReturnStatement( _
New CodeFieldReferenceExpression( _
New CodeThisReferenceExpression(), "heightValue")))
targetClass.Members.Add(heightProperty)
' Declare the read only Area property.
Dim areaProperty As New CodeMemberProperty()
areaProperty.Attributes = _
MemberAttributes.Public Or MemberAttributes.Final
areaProperty.Name = "Area"
areaProperty.HasGet = True
areaProperty.Type = New CodeTypeReference(GetType(System.Double))
areaProperty.Comments.Add(New CodeCommentStatement( _
"The Area property for the object."))
' Create an expression to calculate the area for the get accessor
' of the Area property.
Dim areaExpression As New CodeBinaryOperatorExpression( _
New CodeFieldReferenceExpression( _
New CodeThisReferenceExpression(), "widthValue"), _
CodeBinaryOperatorType.Multiply, _
New CodeFieldReferenceExpression( _
New CodeThisReferenceExpression(), "heightValue"))
areaProperty.GetStatements.Add( _
New CodeMethodReturnStatement(areaExpression))
targetClass.Members.Add(areaProperty)
End Sub 'AddProperties
' Adds a method to the class. This method multiplies values stored
' in both fields.
Public Sub AddMethod()
' Declaring a ToString method.
Dim toStringMethod As New CodeMemberMethod()
toStringMethod.Attributes = _
MemberAttributes.Public Or MemberAttributes.Override
toStringMethod.Name = "ToString"
toStringMethod.ReturnType = _
New CodeTypeReference(GetType(System.String))
Dim widthReference As New CodeFieldReferenceExpression( _
New CodeThisReferenceExpression(), "Width")
Dim heightReference As New CodeFieldReferenceExpression( _
New CodeThisReferenceExpression(), "Height")
Dim areaReference As New CodeFieldReferenceExpression( _
New CodeThisReferenceExpression(), "Area")
' Declaring a return statement for method ToString.
Dim returnStatement As New CodeMethodReturnStatement()
' This statement returns a string representation of the width,
' height, and area.
Dim formattedOutput As String = "The object:" & Environment.NewLine _
& " width = {0}," & Environment.NewLine & " height = {1}," _
& Environment.NewLine & " area = {2}"
returnStatement.Expression = New CodeMethodInvokeExpression( _
New CodeTypeReferenceExpression("System.String"), "Format", _
New CodePrimitiveExpression(formattedOutput), widthReference, _
heightReference, areaReference)
toStringMethod.Statements.Add(returnStatement)
targetClass.Members.Add(toStringMethod)
End Sub 'AddMethod
' Add a constructor to the class.
Public Sub AddConstructor()
' Declare the constructor
Dim constructor As New CodeConstructor()
constructor.Attributes = _
MemberAttributes.Public Or MemberAttributes.Final
' Add parameters.
constructor.Parameters.Add( _
New CodeParameterDeclarationExpression( _
GetType(System.Double), "width"))
constructor.Parameters.Add( _
New CodeParameterDeclarationExpression( _
GetType(System.Double), "height"))
' Add field initialization logic
Dim widthReference As New CodeFieldReferenceExpression( _
New CodeThisReferenceExpression(), "widthValue")
constructor.Statements.Add(New CodeAssignStatement( _
widthReference, New CodeArgumentReferenceExpression("width")))
Dim heightReference As New CodeFieldReferenceExpression( _
New CodeThisReferenceExpression(), "heightValue")
constructor.Statements.Add( _
New CodeAssignStatement(heightReference, _
New CodeArgumentReferenceExpression("height")))
targetClass.Members.Add(constructor)
End Sub 'AddConstructor
' Add an entry point to the class.
Public Sub AddEntryPoint()
Dim start As New CodeEntryPointMethod()
Dim objectCreate As New CodeObjectCreateExpression( _
New CodeTypeReference("CodeDOMCreatedClass"), _
New CodePrimitiveExpression(5.3), _
New CodePrimitiveExpression(6.9))
' Add the statement:
' "CodeDOMCreatedClass testClass = _
' new CodeDOMCreatedClass(5.3, 6.9);"
start.Statements.Add(New CodeVariableDeclarationStatement( _
New CodeTypeReference("CodeDOMCreatedClass"), _
"testClass", objectCreate))
' Creat the expression:
' "testClass.ToString()"
Dim toStringInvoke As New CodeMethodInvokeExpression( _
New CodeVariableReferenceExpression("testClass"), "ToString")
' Add a System.Console.WriteLine statement with the previous
' expression as a parameter.
start.Statements.Add(New CodeMethodInvokeExpression( _
New CodeTypeReferenceExpression("System.Console"), _
"WriteLine", toStringInvoke))
targetClass.Members.Add(start)
End Sub 'AddEntryPoint
' Generate Visual Basic source code from the compile unit.
Public Sub GenerateVBCode(ByVal fileName As String)
Dim provider As CodeDomProvider
provider = CodeDomProvider.CreateProvider("VisualBasic")
Dim options As New CodeGeneratorOptions()
Dim sourceWriter As New StreamWriter(fileName)
Try
provider.GenerateCodeFromCompileUnit( _
targetUnit, sourceWriter, options)
Finally
sourceWriter.Dispose()
End Try
End Sub 'GenerateVBCode
' Create the CodeDOM graph and generate the code.
Shared Sub Main()
Dim sample As New Sample()
sample.AddFields()
sample.AddProperties()
sample.AddMethod()
sample.AddConstructor()
sample.AddEntryPoint()
sample.GenerateVBCode(outputFileName)
End Sub 'Main
End Class 'Sample |
