Over the holiday I began to dive into WCF (Windows Communication Foundation). A few months ago, I created a simple Zip Code Lookup service using ThinkTecture's WSCF (Web Service Contract First add-in). The Zip Code Lookup service is the perfect project to upgrade to WCF.
One of the operations I added to the Zip Code Lookup service is called 'GetStateCodes'. The GetStateCodes operation retrieves a list of State Codes (ex: 'FL', 'Jacksonville') see code below. BTW, I'm also using SubSonic for the DAL.
Ok, I need a unit test as well and this is where I used List.Find to return an instance of StateCode from List<StateCode>. Normally, I'd write a ForEach statement in a separate method to find an object in a collection. However, now with Generics things are much easier.
Here is another reference from Developer Fusion that demonstrates sorting and searching a generic list.
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[TestMethod()]
public void SearchByState()
{
ZipCodeService svc = new ZipCodeService();
ZipCodeSearchRequest request = new ZipCodeSearchRequest();
List<StateCode> states = svc.GetStateCodes();
request.State = states.Find(delegate(StateCode state) { return state.StateAbbr == "FL"; });
List<ZipCodeInfo> actual = svc.ZipCodeSearch(request);
Assert.IsTrue(actual.Count > 0);
} |
Operation Implementation Code:
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public List<StateCode> GetStateCodes()
{
// Execute search and load results
Query qry = new Query(ZipCode.Schema);
qry.SelectList = ZipCode.Columns.StateCode + ", " + ZipCode.Columns.StateName;
qry.OrderBy = OrderBy.Asc(ZipCode.Columns.StateCode);
List<StateCode> stateInfo = null;
using (IDataReader dr = qry.ExecuteReader())
{
// Translate collection to WCF datacontract
stateInfo = translate.StateInfo(dr);
}
// Return results to happy consumer
return stateInfo;
} |
DataContract for StateCode:
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[DataContract(Namespace = Namespaces.ZipCodeNamespace)]
public class StateCode
{
private string stateAbbrField;
private string stateNameField;
public StateCode() {}
public StateCode(string stateAbbr, string stateName)
{
StateAbbr = stateAbbr;
StateName = stateName;
}
[DataMember(Order = 0)]
public String StateAbbr { get { return stateAbbrField; } set { stateAbbrField = value; } }
[DataMember(Order = 1)]
public string StateName { get { return stateNameField; } set { stateNameField = value; } }
} |