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Property values must be stored somewhere. In a typical object property, values are stored in backing fields, which are simply private fields declared in the class for example: private string _name = string.Empty; private int _id; If you use the compact property declaration syntax, the compiler will create a hidden private backing field on your behalf. public string Name { get; set; } In this case, you don t know or care about the field name, but the field is there nonetheless. CSLA .NET allows you to use private backing fields if you would like, or you can allow CSLA .NET to manage the field values automatically. Using private backing fields offers better performance, but it does require that you declare and initialize the backing field in your code. Managed backing fields incur a performance penalty, because CSLA .NET is actually storing the field values in a collection on your behalf, but they require less code in your business class.
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When using CSLA .NET for Silverlight, managed backing fields are serialized automatically. However, you must write extra code to coordinate the serialization of all private backing fields.
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You can use private backing fields for any field value required by your object. However, when it comes to storing references to child objects, I strongly recommend using managed backing fields. I ll discuss storing child references later in the chapter, as they are relatively complex. If you choose to store child references in private backing fields, then you ll have to deal with all that complexity yourself. On the other hand, a managed backing field takes care of everything automatically.
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As with many features of CSLA .NET, you can choose which technique suits your needs best. In general, I typically use managed backing fields and only switch to private backing fields when dealing with large collections of objects where performance is a bigger issue.
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Private Backing Fields
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The four property helper methods have overloads that accept private backing fields as parameters. For example, you can call GetProperty() like this: private static PropertyInfo<string> NameProperty = RegisterProperty(new PropertyInfo<string>("Name")); private string _name = NameProperty.DefaultValue; public string Name { get { return GetProperty(NameProperty, _name); } set { SetProperty(NameProperty, ref _name, value); } } The bold lines indicate the differences with the previous example code. Notice that a field is now declared explicitly and is initialized to a default value.
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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.
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 ref qualifier. 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.
Private Backing Fields with Type Conversion
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 static PropertyInfo<SmartDate> BirthDateProperty = RegisterProperty(new PropertyInfo<SmartDate>("BirthDate")); private SmartDate _birthDate = BirthDateProperty.DefaultValue; public string BirthDate { get { return GetPropertyConvert<SmartDate, string>( BirthDateProperty, _birthDate); } set { SetProperty<SmartDate, string>( BirthDateProperty, ref _birthDate, value); } }
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