WCF数据服务是否支持使用Entity Framework Code First(4.1)?看起来很难理解如何处理DbSet
或DbContext
。我认为这不应该太令人惊讶,因为EFCF是在数据服务之后发布的。
internal class Context:DbContext {
public Context(String nameOrConnectionString) : base(nameOrConnectionString) { }
public DbSet<AlertQueue> Alerts { get; set; }
}
public class EntitySet:Abstract.EntitySet {
public EntitySet(String nameOrConnectionString) {
var context = new Context(nameOrConnectionString);
this.AlertQueueRepository = new Concrete.AlertQueueRepository(new Repository<AlertQueue>(context, context.Alerts));
}
}
public class AlertQueueRepository:EntityRepository<AlertQueue> {
public AlertQueueRepository(IEntityRepository<AlertQueue> entityRepository):base(entityRepository) { }
public IQueryable<AlertQueue> Pending {
get {
return (from alert in this.All
where alert.ReviewMoment == null
select alert);
}
}
}
EntityRepository
和IEntityRepository
为All
和其他CRUD函数提供了通用方法。这是无效的WCF数据服务:
public class WcfDataService1:DataService<Domain.Concrete.AlertQueueRepository> {
public static void InitializeService(DataServiceConfiguration config) {
config.SetEntitySetAccessRule("All", EntitySetRights.AllRead);
config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
}
}
答案 0 :(得分:2)
我刚做了这个非常简单的测试:
WCF服务:
public class WcfDataService : DataService<Context>
{
public static void InitializeService(DataServiceConfiguration config)
{
config.SetEntitySetAccessRule("*", EntitySetRights.All);
config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
}
}
上下文:
public class Context : DbContext
{
public DbSet<User> Users { get; set; }
public Context()
{
this.Configuration.ProxyCreationEnabled = false;
}
}
[DataServiceKey("Id")]
public class User
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
}
它有效,但我担心它是只读的。 Here is a workaround允许修改数据。
答案 1 :(得分:2)
您需要安装Microsoft WCF Data Services 2011 CTP2。
以下是ADO.NET团队博客中的一篇很好的分步文章:Using WCF Data Services with Entity Framework 4.1 and Code First
您需要更改“System.Data.Services”和“System.Data.Services.Client”的引用 安装CTP后“Microsoft.Data.Services”和“Microsoft.Data.Services.Client”,然后你将有一个新的V3协议版本(DataServiceProtocolVersion.V3)
添加如下所示的构造函数以传入连接字符串或数据库名称
public class HospitalContext : DbContext
{
public HospitalContext(string dbname) : base(dbname)
{
}
public DbSet<Patient> Patients { get; set; }
public DbSet<LabResult> LabResults { get; set; }
}