How Web API returns multiple types

问题

I am just wondering whether it is possible to return multiple types in a single Web Api. For example, I want an api to return both lists of customers and orders (these two sets of data may or may not relate to each other?

回答1:

To return multiple types, you can wrap them into anonymous type, there are two possible approaches:

public HttpResponseMessage Get()
{
    var listInt = new List<int>() { 1, 2 };
    var listString = new List<string>() { "a", "b" };

    return ControllerContext.Request
        .CreateResponse(HttpStatusCode.OK, new { listInt, listString });
}

Or:

public object Get()
{
    var listInt = new List<int>() { 1, 2 };
    var listString = new List<string>() { "a", "b" };

    return  new { listInt, listString };
}

Also remember that The XML serializer does not support anonymous types. So, you have to ensure that request should have header:

Accept: application/json

in order to accept json format

回答2:

You have to use JsonNetFormatter serializer, because the default serializer- DataContractJsonSerializer can not serialize anonymous types.

public HttpResponseMessage Get()
{
    List<Customer> cust = GetCustomers();
    List<Products> prod= GetCustomers();
    //create an anonymous type with 2 properties
    var returnObject = new { customers = cust, Products= prod };
    return new HttpResponseMessage<object>(returnObject , new[] { new JsonNetFormatter() });
}

You could get JsonNetFormatter from HERE

回答3:

Instead of this:

return ControllerContext.Request
       .CreateResponse(HttpStatusCode.OK, new { listInt, listString });

use this:

return Ok(new {new List<int>() { 1, 2 }, new List<string>() { "a", "b" }});

来源：https://stackoverflow.com/questions/11733205/how-web-api-returns-multiple-types

标签

asp.net-web-api