web api 返回数据

        [HttpGet]
        public void GetNone()
        {

        }

        [HttpGet]
        public HttpResponseMessage GetNone()
        {
            HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, "value");
            response.Content = new StringContent("{'name':'tom'}", Encoding.Unicode);
            response.Headers.CacheControl = new CacheControlHeaderValue()
            {
                MaxAge = TimeSpan.FromMinutes(20)
            };
            return response;
        }

public HttpResponseMessage Get()
{
    // Get a list of products from a database.
    IEnumerable<Product> products = GetProductsFromDB();

    // Write the list to the response body.
    HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, products);
    return response;
}