ASP .NET MVC 4 WebApi:手动处理OData查询

Question

我必须使用Web服务取得的WebAPI由ASP .NET MVC提供4.我知道其中的WebAPI自动工作在顶部层处理的OData查询(例如$filter,$top,$skip),但如果我想自己处理过滤？

我不是简单地从我的数据库返回数据,但我有另一个层添加了一些属性,进行了一些转换等等.因此查询我的所有数据,转换它们并将它们返回到WebAPI类进行OData过滤不仅仅是好的足够.它当然非常慢,通常是一个糟糕的想法.

那么有没有办法将OData查询参数从我的WebAPI入口点传播到我调用的函数来获取和转换数据？

例如,/api/people?$skip=10&$top=10要调用服务器的GET :

public IQueryable<Person> get() {
    return PersonService.get(SomethingAboutCurrentRequest.CurrentOData);
}

并在PersonService:

public IQueryable<Person> getPeople(var ODataQueries) {
    IQueryable<ServerSidePerson> serverPeople = from p in dbContext.ServerSidePerson select p;
    // Make the OData queries
    // Skip
    serverPeople = serverPeople.Skip(ODataQueries.Skip);
    // Take
    serverPeople = serverPeople.Take(ODataQueries.Take);
    // And so on
    // ...

    // Then, convert them
    IQueryable<Person> people = Converter.convertPersonList(serverPeople);
    return people;
}

Answer 1

我只是偶然发现了这个老帖子,我正在添加这个答案,因为现在很容易自己处理OData查询.这是一个例子:

[HttpGet]
[ActionName("Example")]
public IEnumerable<Poco> GetExample(ODataQueryOptions<Poco> queryOptions)
{
    var data = new Poco[] { 
        new Poco() { id = 1, name = "one", type = "a" },
        new Poco() { id = 2, name = "two", type = "b" },
        new Poco() { id = 3, name = "three", type = "c" }
    };

    var t = new ODataValidationSettings() { MaxTop = 2 };
    queryOptions.Validate(t);

    //this is the method to filter using the OData framework
    //var s = new ODataQuerySettings() { PageSize = 1 };
    //var results = queryOptions.ApplyTo(data.AsQueryable(), s) as IEnumerable<Poco>;

    //or DIY
    var results = data;
    if (queryOptions.Skip != null) 
        results = results.Skip(queryOptions.Skip.Value);
    if (queryOptions.Top != null)
        results = results.Take(queryOptions.Top.Value);

    return results;
}

public class Poco
{
    public int id { get; set; }
    public string name { get; set; }
    public string type { get; set; }
}