现在添加设计器表面并从属性窗口改变序列化模式为单向的。现在，我们的设计器就生成了可以供WCF使用的LINQ to SQL类。如果你想使用自定义用户定义类型，你必须为你的类设置[DataContract]特性并且你必须为你想暴露的WCF服务类的每个属性添加[DataMember]特性。
现在，我们将添加一个如下形式的服务接口:
namespace ServiceLibrary
{
[ServiceContract(Namespace = "ServiceLibrary")]
interface IToDoService
{
[OperationContract]
ToDo GetToDo(long ID);
[OperationContract]
ToDo AddToDo(ToDo toDo);
[OperationContract]
bool DeleteToDo(ToDo todo);
[OperationContract]
ToDo UpdateToDo(ToDo todo);
[OperationContract]
List<ToDo> GetAllToDo();
}
}
{
[ServiceContract(Namespace = "ServiceLibrary")]
interface IToDoService
{
[OperationContract]
ToDo GetToDo(long ID);
[OperationContract]
ToDo AddToDo(ToDo toDo);
[OperationContract]
bool DeleteToDo(ToDo todo);
[OperationContract]
ToDo UpdateToDo(ToDo todo);
[OperationContract]
List<ToDo> GetAllToDo();
}
}
注意，在ServiceContract 接口特性中我们已经提到的一个命名空间。这点非常重要。我们将使用该名字作为服务的名称以便内部的JavaScript代码访问该服务。现在，我们将添加实现该服务的接口；其代码如下。
请注意代码中在类特性上所使用的[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]特性；这对于以ASP.NET AJAX启用WCF服务暴露的方式是必须的。
namespace ServiceLibrary
{
[AspNetCompatibilityRequirements(RequirementsMode =
AspNetCompatibilityRequirementsMode.Allowed)]
public class ToDoService : IToDoService
{
#region IToDoService Members
public ToDo GetToDo(long ID)
{
DataClasses1DataContext context = new DataClasses1DataContext();
var toDos = from p in context.ToDos
where p.ID == ID
select p;
List<ToDo> listTodos = toDos.ToList();
if (listTodos != null && listTodos.Count > 0)
{
return listTodos[0];
}
else
{
return null;
}
}
#endregion
}
}
{
[AspNetCompatibilityRequirements(RequirementsMode =
AspNetCompatibilityRequirementsMode.Allowed)]
public class ToDoService : IToDoService
{
#region IToDoService Members
public ToDo GetToDo(long ID)
{
DataClasses1DataContext context = new DataClasses1DataContext();
var toDos = from p in context.ToDos
where p.ID == ID
select p;
List<ToDo> listTodos = toDos.ToList();
if (listTodos != null && listTodos.Count > 0)
{
return listTodos[0];
}
else
{
return null;
}
}
#endregion
}
}
