datacontract helper

    public static class DataContractHelper
    {

        public static void ToDCFile<T>(this T obj, string path)  
        {
            //路径
            FileStream fs = new FileStream(path, FileMode.Create);
            try
            {
                DataContractSerializer s = new DataContractSerializer(typeof(T));
                s.WriteObject(fs, obj);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                fs.Close();
            }
        }

        public static T FromDCFile<T>(string path)   
        {
            FileStream fs = new FileStream(path, FileMode.Open);
            try
            {
                DataContractSerializer s = new DataContractSerializer(typeof(T));
                var obj = s.ReadObject(fs);
                return (T)obj;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return default(T);
            }
            finally
            {
                fs.Close();
            }

        }

        public static string ToDCJsone<T>(this T obj)  where T:new()
        {
            string result = string.Empty;
            //路径
            MemoryStream ms = new MemoryStream();
            try
            {
                DataContractJsonSerializer s = new DataContractJsonSerializer(typeof(T));
                s.WriteObject(ms, obj);
                ms.Position = 0;
                result = (new StreamReader(ms, Encoding.UTF8)).ReadToEnd();
                return result;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return "";
            }
            finally
            {
                ms.Close();
            }
        }

        public static T FromDCJsone<T>(string jsonStr)   
        {
            MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(jsonStr));
            try
            {
                DataContractJsonSerializer s = new DataContractJsonSerializer(typeof(T));
                ms.Position = 0;
                var obj = s.ReadObject(ms);
                return (T)obj;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return default(T);
            }
            finally
            {
                ms.Close();
            }

        }

    }