c# - 在核心的 odataqueryoptions 中处理选择？

Question

我有一个常规 Controller ，它具有 odata 功能:

[Route("[controller]")]
public class ChannelsController : Controller
{
    private readonly ChannelContext db = new ChannelContext();
    public IQueryable<PrdChannel> Get()
    {
        var entities = db.PrdChannel.AsQueryable();
        var modelManager = (IODataModelManger) HttpContext.RequestServices.GetService(typeof(IODataModelManger));
        var model = modelManager.GetModel(nameof(ProductConfiguration));
        var queryContext = new ODataQueryContext(model, typeof(PrdChannel), null);
        var queryOptions = new ODataQueryOptions(queryContext, HttpContext.Request);

        return queryOptions
            .ApplyTo(entities, new ODataQuerySettings
            {
                HandleNullPropagation = HandleNullPropagationOption.True
            })
            .Cast<PrdChannel>();
    }
}

我可以发出 GET:https://myservice/Channel?$filter=cable lt 10

但是，当我尝试执行 $select 时，它不起作用!

https://myservice/Channel?$select=cable

根据 OdataQueryOptions 的定义，它不支持选择/扩展。

问题:aspnetcore如何支持$select？

也许这应该是一个 ODataController？

Answer 1

重复:Can't apply $select when using ODataQueryOptions

要允许在 OData 中支持 $select，您不能将 IQueryable 强制转换为已定义的类型，您需要改用 dynamic 类型。

    public IQueryable<dynamic> Get()
    {
        ... your code ...
        return queryOptions
            .ApplyTo(entities, new ODataQuerySettings
            {
                HandleNullPropagation = HandleNullPropagationOption.True
            })
            as IQueryable<dynamic>;
    }