在 JSON 反序列化期间没有为System.String类型定义无参数构造函数

这看起来应该很简单，但当我try 将一些简单的JSON转换成托管类型时，我遇到了一个例外.例外情况是:

MissingMethodException

While it is true that there are no parameterless constructors for System.String, I'm not clear as to why this matters.

The code that performs the deserialization is:

using System.Web.Script.Serialization;
private static JavaScriptSerializer serializer = new JavaScriptSerializer();
public static MyType Deserialize(string json)
{
    return serializer.Deserialize<MyType>(json);
}

My type is roughly:

public class MyType
{
    public string id { get; set; }
    public string type { get; set; }
    public List<Double> location { get; set; }
    public Address address { get; set; }
    public Dictionary<string, string> localizedStrings { get; set; }
}

另一个类用于地址:

public class Address
{
    public string addressLine { get; set; }
    public string suite { get; set; }
    public string locality { get; set; }
    public string subdivisionCode { get; set; }
    public string postalCode { get; set; }
    public string countryRegionCode { get; set; }
    public string countryRegion { get; set; }
}

以下是JSON:

{
    "id": "uniqueString",
    "type": "Foo",
    "location": [
        47.6,
        -122.3321
    ]
    "address": {
        "addressLine": "1000 Fourth Ave",
        "suite": "en-us",
        "locality": "Seattle",
        "subdivisionCode": "WA",
        "postalCode": "98104",
        "countryRegionCode": "US",
        "countryRegion": "United States"
    },
    "localizedStrings": {
        "en-us": "Library",
        "en-ES": "La Biblioteca"
    }
}

I get the same exception even if my JSON is just:

{
    "id": "uniquestring"
}

有人能告诉我为什么System.String需要无参数构造函数吗？