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You must initialize String fields to a non-Null value. Other fields may be optionally initialized, but I recommend initializing all fields as shown.
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Also notice how the field is passed as a parameter to GetProperty(). As you can imagine, GetProperty() simply returns the value as a result, but only after checking authorization rules. The SetProperty() method is more interesting, because the field is passed as a parameter using the ByRef qualifier in the method signature in BusinessBase. This means the field is passed by reference, so any changes you make to the field inside the SetProperty() method will actually change the value of the field itself. In this case, SetProperty() still performs the steps shown in Figures 7-1 and 7-2, but if the property s value is ultimately changed, the new value will be put directly into that field, which is passed by reference.
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There are variations on the four property helper methods that can be used to help convert a field from one type to another. For example, you may maintain the field value as an Enum or SmartDate type but declare the property itself to be of type String. This is useful when the user wants to see a friendly name but the object wants a more computer-friendly data type for the property. Private Shared BirthDateProperty As PropertyInfo(Of SmartDate) = _ RegisterProperty(New PropertyInfo(Of SmartDate)("BirthDate")) Private _birthDate As SmartDate = BirthDateProperty.DefaultValue Public Property BirthDate() As String Get Return GetPropertyConvert(Of SmartDate, String)(BirthDateProperty, _birthDate) End Get Set(ByVal value As String) SetPropertyConvert((Of SmartDate, String)( _ BirthDateProperty, _birthDate, value) End Set End Property Rather than calling GetProperty(), this code calls GetPropertyConvert(), which takes two type parameters. The first is the type of the backing field, and the second is the type of the property. The GetPropertyConvert() method is implemented in BusinessBase like this:
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CH A PT ER 7 PRO PERTY DE CLA RAT IO NS
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Protected Function GetPropertyConvert(Of F, P)(_ ByVal propertyInfo As PropertyInfo(Of F), ByRef field As F) As P Return Utilities.CoerceValue(Of P)(GetType(F), Nothing, _ GetProperty(Of F)(propertyInfo.Name, field, propertyInfo.DefaultValue, _ Security.NoAccessBehavior.SuppressException)) End Function This method delegates the task of getting the field value to the GetProperty() method you ve already seen. However, it then uses Utilities.CoerceValue() to coerce the value to the specified property type. You might wonder how this differs from just using a cast to change the value type. The CoerceValue() method attempts to perform a cast, but it s more aggressive and attempts other techniques of type conversion as well, including using .NET type converters. It also includes functionality to convert Enum types into and out of text representations. The end result is that these versions of the four property helper methods can save you a lot of code and complexity in cases where the property type and backing field type do not match.
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My first property example illustrated how to declare a property that uses a managed backing field: Private Shared NameProperty As PropertyInfo(Of String) = _ RegisterProperty(New PropertyInfo(Of String)("Name")) Public Property Name() As String Get Return GetProperty(NameProperty) End Get Set(ByVal value As String) SetProperty(NameProperty, value) End Set End Property Notice that no Private field is declared, so there s no field to pass to the GetProperty() or SetProperty() method. Behind the scenes, the field manager stores and retrieves the value from a data structure. I ll discuss the field manager in more detail later.
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As with Private backing fields, four methods get and set managed property values while converting the value to different types. The syntax is similar to what you ve already seen: Private Shared CategoryProperty As PropertyInfo(Of CategoryEnum) = _ RegisterProperty(New PropertyInfo(Of CategoryEnum)("Category")) Public Property Category() As String Get Return GetPropertyConvert(Of CategoryEnum, String)(CategoryProperty) End Get Set(ByVal value As String) SetPropertyConvert(Of CategoryEnum, String)(CategoryProperty, value) End Set End Property Again, rather than calling GetProperty() or SetProperty(), similar methods are called such as GetPropertyConvert(). These methods take two type parameters; the first is the type of the field value, and the second is the type of the property. The GetPropertyConvert() overload looks like this:
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