Why is this an issue?
When creating a custom Markup Extension
that accepts parameters in WPF, the ConstructorArgument markup
must be used to identify the discrete properties that match these parameters. However since this is done via a string, the compiler won’t give you any
warning in case there are typos.
This rule raises an issue when the string argument to ConstructorArgumentAttribute doesn’t match any parameter of any constructor.
How to fix it
Code examples
Noncompliant code example
Imports System
Namespace MyLibrary
Public Class MyExtension
Inherits MarkupExtension
Public Sub New()
End Sub
Public Sub New(ByVal value1 As Object)
Value1 = value1
End Sub
<ConstructorArgument("value2")> ' Noncompliant
Public Property Value1 As Object
End Class
End Namespace
Compliant solution
Imports System
Namespace MyLibrary
Public Class MyExtension
Inherits MarkupExtension
Public Sub New()
End Sub
Public Sub New(ByVal value1 As Object)
Value1 = value1
End Sub
<ConstructorArgument("value1")>
Public Property Value1 As Object
End Class
End Namespace
Resources
Documentation
