The One With

So far we have been focusing on creating and consuming one-way OData feeds (read-only feeds). This time, let us look at how to CREATE, UPDATE and DELETE items. CUD operations are handled by the IDataServiceUpdateProvider and this interface is fully supported by the eXpress Persistent Objects (XPO) Toolkit.

Server Side

Apart from setting the entity access rule to EntitySetRights.All, there is nothing we really need to do on the server side.

Client Side

CREATE

void CreateObject(object entity) {
    DataServiceContext service 
        = new DataServiceContext(new Uri("http://localhost:7676/Service.svc"));

    service.AddObject("<EntitySetName>", entity);

    service.SaveChanges();
}

UPDATE

void UpdateObject(object entity) {
    DataServiceContext service 
        = new DataServiceContext(new Uri("http://localhost:7676/Service.svc"));

    service.AttachTo("<EntitySetName>", entity);
    service.UpdateObject(entity);

    service.SaveChanges();
}

DELETE

void DeleteObject(object entity) {
    DataServiceContext service 
        = new DataServiceContext(new Uri("http://localhost:7676/Service.svc"));

    service.AttachTo("<EntitySetName>", entity);
    service.DeleteObject(entity);

    service.SaveChanges();
}

Sample Application

To see all CRUD operations in action download the source code for the WinForms Calendar Sample

Resources

• OData Provider for XPO – Introduction
• OData Provider for XPO – IDataServiceQueryProvider
• OData Provider for XPO – Client Side
• OData Provider for XPO – Complex Types

Cheers

Azret