不能将类型字符串转换为List使用JavascriptSerializer

Question

我尝试了序列化我的手机列表：

在我的应用程序中，我在我的控制器中使用javascriptSerializer：

[HttpGet]
    public List<Phone> GetPhones()
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        var serializedResult = serializer.Serialize(new TestPhoneService().GetTestData());
        return serializedResult;
    }

我的方法 GetPhones（）应该以 json格式返回手机，但我有错误： 无法将类型'string'隐式转换为'System.Collections.Generic.List ... 可能有人知道我如何配置 javascript序列化程序来解决它的错误？谢谢你的回答！

Answer 1

Currently, your GetPhones() method is expecting a List<Phone> to be returned, however you are currently returning the result of the Serialize() method which is going to yield a string.

If you want to explicitly return a List<Phone>, then you don't really need to serialize your content at all and you could simply return the collection as follows :

[HttpGet]
public List<Phone> GetPhones()
{
    return new TestPhoneService().GetTestData();
}

Likewise, if you wanted to return a JSON serialized version of your collection, you could try changing your return type to JsonResult and using the Json() method when returning your collection :

[HttpGet]
public JsonResult GetPhones()
{
    return Json(new TestPhoneService().GetTestData());
}

Answer 2

您收到此错误是因为JavascriptSerializer.Serialize(...)返回string，但您的方法会返回电话列表。将GetPhones()的返回类型更改为string。

Answer 3

要从操作方法GetPhones（）返回Json格式，请将返回类型从List更改为ActionResult或JsonResult类型。并使用return Json（serializedResult）而不是return serializedResult;