Asp.net DataContractJsonSerializer ReadObject（）返回空值

我正在尝试反序列化JSON数据，以便将这些值插入数据库，但我在sts.text中不断得到空值。有人能帮忙吗？谢谢

这是我的数据合同

[DataContract]
internal class Statuses
{
    [DataMember(Name = "text", IsRequired = false)]
    internal string text;
}


        try
        {
            HttpWebResponse webResponse = webRequest.GetResponse() as HttpWebResponse;
            Stream dataStream = webResponse.GetResponseStream();
            // Open the stream using a StreamReader for easy access.
            StreamReader reader = new StreamReader(dataStream);
            // Read the content.
            string responseFromServer = reader.ReadToEnd();

            DataContractJsonSerializer js = new DataContractJsonSerializer(typeof(Statuses));
            MemoryStream ms = new MemoryStream(System.Text.ASCIIEncoding.ASCII.GetBytes(responseFromServer));

            Statuses sts = (Statuses)js.ReadObject(ms);                
            Console.WriteLine("text: " + sts.text);

        }
        catch (Exception ex)
        {
        }

这对我很有用：

    // Read the content.
    const string responseFromServer = "{\"text\":\"testing\"}"; //Add JSON

    var js = new DataContractJsonSerializer(typeof(Statuses));
    var ms = new MemoryStream(Encoding.UTF8.GetBytes(responseFromServer));

    var sts = (Statuses)js.ReadObject(ms);
    Response.Write("text: " + sts.text);

同样值得注意的是，我用公共访问修饰符转换了内部访问修饰符

还请注意，我改变了：

System.Text.ASCIIEncoding.ASCII.GetBytes(responseFromServer)

与：

Encoding.UTF8.GetBytes(responseFromServer)

我从测试中得到的最终结果是：

---

text:测试

responseFromServer的值是多少？我正在尝试测试这个，但我需要JSON数据。

Encoding.UTF8.GetBytes(responseFromServer)