Question

我正在使用Azure MobileServices编写WindowsPhone应用程序，并希望使用TableControllers将数据库公开给客户端。

public IQueryable<Activity> GetAllActivities()
{
    return Query();
}

但是如何过滤控制器返回客户端的数据呢？我已经发现，我可以使用Where（..）来过滤行。

但是有没有办法从结果集中排除列？

提前致谢！

Answer 1

有两种方法可以做到，但取决于要求：

1 - 使用与模型映射的特定dtos

您可以创建与Azure Mobile Service中的模型映射的Dtos，并且模型与数据库连接。 Dtos不需要公开我的所有模型，比如

我可以

public class MyDto
{
  public string Name {get;set;}
}

我的模特可以

public class MyModel
{
   public string Name {get;set;}

   public string Details {get;set;}
}

然后需要映射它们，在Azure Mobile Service中我们通常使用AutoMapper

2 - 使用Linq中的“选择”方法

在客户端应用程序中，您可以执行类似

的操作

_client.GetTable<YourObject>().Select(x => new YourObject()
{
    Prop1 = x.Prop1,
    Prop2 = x.Prop2,
}

当您需要进行查询时，您应该使用Linq。

Answer 2

one good option for you would be overwriting your EntityDomainManager.

What I mean is creating a new class call it for example KhosroItemDomainManager

public class KhosroItemDomainManager : MappedEntityDomainManager<YourModelHere, YourEntityHere>
{
    public KhosroItemDomainManager(DbContext context, 
        System.Net.Http.HttpRequestMessage request, ApiServices services): base(context, request, services)
    { }

    public override IQueryable<YourModelHere> Query()
    {
        MobileServiceContext ctx = this.Context as MobileServiceContext;

        var items = from ai in ctx.YourModelHere
            select new AuctionItem
            {
                Name = ai.Name,
                Description = ai.Description,

            };

        return items;
    }

    public override System.Web.Http.SingleResult<YourModelHere> Lookup(string id)
    {
        var ctx = Context as MobileServiceContext;
        var item = from ai in ctx.AuctionItems
                   where ai.Id == id
                   select new AuctionItem
                   {
                       Id = ai.Id,
                       Description = ai.Description,

                   };

        return new System.Web.Http.SingleResult<YourModelHere>(item);
    }

    public override Task<bool> DeleteAsync(string id)
    {
        return base.DeleteItemAsync(id);
    }
    public override Task<YourModelHere> UpdateAsync(string id, System.Web.Http.OData.Delta<YourModelHere> patch)
    {
        return base.UpdateEntityAsync(patch, id);
    }


}

as simple as that, basically, all you need to do is creating your own domain manager. and override the Query, Lookup , DeleteAsync and UpdateAsync

after that you need to go back to your Controller and replace this part with

 protected override void Initialize(HttpControllerContext controllerContext)
    {
        base.Initialize(controllerContext);
        MobileServiceContext context = new MobileServiceContext();
        DomainManager = new EntityDomainManager<YourModelHere>(context, Request,       Services);
    }

with

 protected override void Initialize(HttpControllerContext controllerContext)
    {
        base.Initialize(controllerContext);
        MobileServiceContext context = new MobileServiceContext();
        DomainManager = new KhosroItemDomainManager(context, Request, Services);
    }

排除Azure MobileService TableController中的列

2 个答案: