We get a lot of questions about JSON serialization so we thought we would do a blog post on it. This code was executed using EntitySpaces 2010 but it should work the same for EntitySpaces 2009. We used the the NET 3.5 JSON serializer "DataContractJsonSerializer" located in the “System.Runtime.Serialization.Json” namespace which is in the “System.ServiceModel.Web” assembly.
Let’s take a look at a easy sample.
Employees emp = new Employees();
emp.Query.es.Top = 1;
emp.Query.Select
(
emp.Query.EmployeeID, emp.Query.FirstName, emp.Query.LastName, emp.Query.HireDate,
(emp.Query.LastName + ", " + emp.Query.FirstName).As("Fullname")
);
emp.Query.Load();
// Modify the first name ...
emp.FirstName = "Freddy";
// Serialize it using our EmployeesProxyStub
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(EmployeesProxyStub));
MemoryStream ms = new MemoryStream();
ser.WriteObject(ms, (EmployeesProxyStub)emp); // Cast it (we have a built in cast operator)
string json = Encoding.Default.GetString(ms.ToArray());
ms.Close();
// Convert it back into an object
MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(json));
ser = new DataContractJsonSerializer(typeof(EmployeesProxyStub));
EmployeesProxyStub empProxy = ser.ReadObject(ms) as EmployeesProxyStub;
ms.Close();
Employees emp2 = empProxy.Entity; // Now we have a reconstituted object
This is what the Empoyee object looks like when serialized in JSON …
{"EmployeeID":1,"LastName":"Burns","FirstName":"Freddy","HireDate":"\/Date(704692800000-0400)\/",
"esRowState":"Modified","ModifiedColumns":["FirstName"],"ExtraColumns":[{"Key":"Fullname","Value":"Burns, Fred"}]}
It also deserializes just fine. You can do the same thing with our Collections, you just would just use the EmployeesCollectionProxyStub and the EmployeesCollection classes.
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