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The key to understanding LINQ is to understand the role of expression trees in the implementation of LINQ. Expression trees are representations of source code as data. Consider the following code passed to the Where() method in LINQ: var result = someCollection.Where( x => x.SomeVal == 42); The parameter provided to the Where() method is a lambda function a more compact syntax for an anonymous method. However, when Where() is invoked, the lambda function is converted into a data structure in the form of an expression tree that looks like Figure 14-3.

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Notice how the code directly alters the instance fields of the object. For instance, the _id field is set to a new Guid value. Since the Id property is read-only, this is the only way to load the Id property with a new value. While the Started property is read-write and could be set through the property, it is more efficient and consistent to directly set the _started field. Since not all properties can be set, it is best to be consistent and always set fields directly. Additionally, the ValidationRules.CheckRules() call will apply all the validation rules in the entire object. Setting a property causes the validation rules for that property to be checked, so setting property values would cause validation rules to be run twice, which is wasteful. Setting the fields and then calling CheckRules() means validation rules are run only once. Of course, the default values set in a new object might not conform to the object s validation rules. In fact, the Name property starts out as an empty string value, which means it is invalid, since that is a required property. Remember that this was specified in the AddBusinessRules() method by associating this property with the StringRequired rule method. To ensure that all validation rules are run against the newly created object s data, ValidationRules.CheckRules() is called. Calling this method with no parameters causes it to run all the validation rules associated with all properties of the object, as defined in the object s AddBusinessRules() method. The end result is that the new object has been loaded with default values, and those values have been validated. The new object is then returned by the data portal to the factory method (NewProject() in this case), which typically returns it to the UI code.

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More interesting and complex is the DataPortal_Fetch() method, which is called by the data portal to tell the object that it should load its data from the database (or other data source). The method accepts a Criteria object as a parameter, which contains the criteria data needed to identify the data to load: private void DataPortal_Fetch(Criteria criteria) { using (SqlConnection cn = new SqlConnection(Database.PTrackerConnection)) { cn.Open(); using (SqlCommand cm = cn.CreateCommand()) { cm.CommandType = CommandType.StoredProcedure; cm.CommandText = "getProject"; cm.Parameters.AddWithValue("@id", criteria.Id); using (SafeDataReader dr = new SafeDataReader(cm.ExecuteReader())) { dr.Read(); _id = dr.GetGuid("Id"); _name = dr.GetString("Name"); _started = dr.GetSmartDate("Started", _started.EmptyIsMin); _ended = dr.GetSmartDate("Ended", _ended.EmptyIsMin); _description = dr.GetString("Description"); dr.GetBytes("LastChanged", 0, _timestamp, 0, 8); // load child objects dr.NextResult(); _resources = ProjectResources.GetProjectResources(dr); } } } }

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Figure 14-3. A simple expression tree Expression trees allow for code to be executed by alternative means that is, the code can be translated to other forms, such as SQL. For example, in LINQ to SQL, the previous expression will get converted into the following SQL query: SELECT * FROM someCollection WHERE SomeVal = 42 What the expression gets converted to in other LINQ providers will vary according to the provider. For example, LINQ to XML could convert the expression to an XPath expression that ordinary code in the System.Xml namespace could execute. In CSLA .NET, the key differences in how expressions are handled occur in two areas. First, the optimization of Where takes advantage of indexing (which I cover in detail later in this chapter). Second, CSLA .NET makes sure that LINQ queries against BusinessListBase return a LinqBindingList that synchronizes with the collection from which it was originally queried, rather than a Sequence that features no such synchronization. The indexing code analyzes the expression passed to the Where clause to determine if indexing is possible. The synchronization code analyzes the expression passed to the Select clause to determine if the projection is an identity projection, and thus, able to be synchronized.

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