C# 读取Json内的数据,中文乱码,怎么解决

   private string getJson()

        {

            string url="http://218.228.332.114:8089/order/xxxxxx?prodid=330006";

            string addressBookStr1 = null;//存放整个的字符串

            HttpWebRequest addressRequest;//

            HttpWebResponse addressResponse;//请求回应

            try

            {

                

                addressRequest = (HttpWebRequest)WebRequest.Create(url);

                addressRequest.Method = "GET";

                addressResponse = (HttpWebResponse)addressRequest.GetResponse();

                string t = addressResponse.ContentType;

                string c = addressResponse.ContentEncoding;

                Stream addressStream = addressResponse.GetResponseStream();

                Encoding encode = System.Text.Encoding.GetEncoding("utf-8");

                StreamReader readStream = new StreamReader(addressStream, encode);

                Char[] read = new Char[256];  

                int count = readStream.Read(read, 0, 256);

                String str = "";

                while (count > 0)

                {

                    // Dumps the 256 characters on a string and displays the string to the console.