Entity framework 谢谢你的建议。。汽车制造商。。解决了我的问题。简言之，是的，有更好的方法。WebApi内置了javascript序列化，因此不需要使用JsonConvert。但是，您不希望直接从控制器返回实体。返回ApiModels（如MVC中的ViewModels）。您

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谢谢你的建议。。汽车制造商。。解决了我的问题。简言之，是的，有更好的方法。WebApi内置了javascript序列化，因此不需要使用JsonConvert。但是，您不希望直接从控制器返回实体。返回ApiModels（如MVC中的ViewModels）。您可以使用AutoMapper使这更容易，但您不必这样做。有关更多信息，请参阅我的更新答案：

protected void Application_Start(object sender, EventArgs e)
        {
            RouteTable.Routes.MapHttpRoute(
            name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}", // browse with localhost:7031/api/product
                //routeTemplate: "{controller}/{id}",  // browse with localhost:7031/product
                 defaults: new { id = System.Web.Http.RouteParameter.Optional }
      );

    public class ProductController : ApiController
    {
        NorthwindEntities db = new NorthwindEntities();

        public List<Product> GetAll()
        {
            return db.Products.ToList<Product>();// ;
        }

    <script src="Script/jquery-1.7.1.min.js" type="text/javascript"></script>

<script type="text/javascript">
    $(function () {
        $('#<%= cviewproduct.ClientID %>').click(function (e) {
            getProducts();
            e.preventDefault();
        });

    });

    function getProducts() {
        $.getJSON("/api/product",
                function (data) {
                    $.each(data, function (key, val) {
                        //var str = val.ProductName;
                        // alert(str);

                        var row = '<tr> <td>' + val.ProductName + '</td><td>' + val.ProductID + '</td><tr/>';

                        $(row).appendTo($('#tblproduct'));


                    });
                });
    }
</script>

public class ProductApiModel
{
    public int ProductId { get; set; }
    public string ProductName { get; set; }
}

public class ProductController : ApiController
{
    public IEnumerable<ProductApiModel> GetAll()
    {
        var products = db.Products
            .OrderBy(x => x.ProductID)
            .Select(x => new ProductApiModel
            {
                ProductId = x.ProductID,
                ProductName = x.ProductName
            });
        return products;
    }
}

public class ProductController : ApiController
{
    public IEnumerable<ProductApiModel> GetAll()
    {
        var entities = db.Products.OrderBy(x => x.ProductID);
        var models = Mapper.Map<ProductApiModel[]>(entities);
        return models;
    }
}

public class ProductController : ApiController
{
    NorthwindEntities db = new NorthwindEntities();

    public List<Product> GetAll()
    {
        return db.Products.ToList<Product>();// ;
    }

public class ProductController : ApiController
{

   public string GetAll()
    {
        var product = db.Products.OrderBy(x => x.ProductID).Select(x => new
                     {
                         ProductId = x.ProductID,
                         ProductName = x.ProductName
                     });
        return JsonConvert.SerializeObject(product);
    }

function getProducts() {
        $.getJSON("/api/product",
                function (data) {
                    $.each(data, function (key, val) {
                        var row = '<tr> <td>' + val.ProductName 
            + '</td><td>' + val.ProductID + '</td><tr/>';
                        $(row).appendTo($('#tblproduct'));

                    });
                });

$.getJSON("/api/product",
                function (data) {
                    var obj = $.parseJSON(data);
                    $.each(obj, function (key, val) {
                        var row = '<tr> <td>' + val.ProductId 
        + '</td><td>' + val.ProductName + '</td><tr/>';
                        $(row).appendTo($('#tblproduct'));
                    });
                });

{
    public class ProductApi
    {
        [Key]
        public Int32 ProductID { get; set; }
        public string ProductName { get; set; }
    }
}

public IEnumerable<ProductApi> getall()
    {
        Mapper.CreateMap<Product, ProductApi>();
        var entities = db.Products.OrderBy(x => x.ProductID).ToList();
        var models = Mapper.Map<ProductApi[]>(entities);
        return models;
    }

public List<ProductApi> GetAll()
{
    var products = db.Products
        .OrderBy(x => x.ProductID)
        .Select(x => new ProductApi
        {
            ProductID = x.ProductID,
            ProductName = x.ProductName
        }).ToList();
    return products;
}

function getProducts() {
    $.getJSON("/api/product",
            function (data) {
                $.each(data, function (key, val) {
                    var row = '<tr> <td>' + val.ProductName + '</td><td>' + val.ProductID + '</td><tr/>';
                    $(row).appendTo($('#tblproduct'));
                });
            });
   }