Odata 使用lowerCamelCase查询Web API 2.2

我将Web API 2.2与

[EnableQuery]

一起使用，如下所示：

public class ProductsController : ApiController
{
    private MyContext db = new MyContext();


    [EnableQuery]
    public IQueryable<Product> GetProducts()
    {
        return db.Products;
    }
}

---

因此，我想知道ApiController是否可以做到这一点？

您需要执行以下步骤：

定义自定义EnableQueryAttribute：

public class MyEnableQueryAttribute:EnableQueryAttribute
{
    public override IEdmModel GetModel(Type elementClrType, HttpRequestMessage request,
        HttpActionDescriptor actionDescriptor)
    {
        // Get model for the request
        IEdmModel model = request.ODataProperties().Model;

        if (model == null)
        {
            // user has not configured anything or has registered a model without the element type
            // let's create one just for this type and cache it in the action descriptor
            model = actionDescriptor.Properties.GetOrAdd("System.Web.OData.Model+" + elementClrType.FullName, _ =>
            {
                ODataConventionModelBuilder builder =
                    new ODataConventionModelBuilder(actionDescriptor.Configuration, isQueryCompositionMode: true);
                builder.EnableLowerCamelCase();
                EntityTypeConfiguration entityTypeConfiguration = builder.AddEntityType(elementClrType);
                builder.AddEntitySet(elementClrType.Name, entityTypeConfiguration);
                IEdmModel edmModel = builder.GetEdmModel();
                Contract.Assert(edmModel != null);
                return edmModel;
            }) as IEdmModel;
        }

        Contract.Assert(model != null);
        return model;
    }
}

将其添加到控制器中的操作：

public class ProductsController : ApiController
{
    [MyEnableQuery]
    public IHttpActionResult Get()
    {
        IList<Product> products=new List<Product>();
        products.Add(new Product() { Id = 1, Name = "Name1",Category=new Category(){Id=1,Name="Category1" }});
        products.Add(new Product() { Id = 2, Name = "Name2", Category = new Category() { Id = 2, Name = "Category2" } });


        return Ok(products.AsQueryable<Product>());
    }
}

我把整个解决方案放在这里：，仅供参考

public class ProductsController : ApiController
{
    [MyEnableQuery]
    public IHttpActionResult Get()
    {
        IList<Product> products=new List<Product>();
        products.Add(new Product() { Id = 1, Name = "Name1",Category=new Category(){Id=1,Name="Category1" }});
        products.Add(new Product() { Id = 2, Name = "Name2", Category = new Category() { Id = 2, Name = "Category2" } });


        return Ok(products.AsQueryable<Product>());
    }
}

GET http://localhost:12568/api/Products?$expand=category