使用DataContractSerializer序列化,但不能反序列化

时间:2011-02-15 22:20:23

标签: c# c#-4.0 xml-serialization datacontractserializer

我有以下两个功能:

public static string Serialize(object obj)
{
    DataContractSerializer serializer = new DataContractSerializer(obj.GetType());
    MemoryStream memoryStream = new MemoryStream();
    serializer.WriteObject(memoryStream, obj);
    return Encoding.UTF8.GetString(memoryStream.GetBuffer());
}

public static object Deserialize(string xml, Type toType)
{
    MemoryStream memoryStream = new MemoryStream(Encoding.UTF8.GetBytes(xml));
   // memoryStream.Position = 0L;
    XmlDictionaryReader reader = XmlDictionaryReader.CreateTextReader(memoryStream, Encoding.UTF8, new XmlDictionaryReaderQuotas(), null);
    DataContractSerializer dataContractSerializer = new DataContractSerializer(toType);
    return dataContractSerializer.ReadObject(reader);
}

第一个似乎将对象序列化为xml字符串就好了。 XML显示有效,没有损坏的标记,开头或结尾没有空格等。现在第二个函数不希望将我的xml字符串反序列化回对象。在最后一行我得到:

  

反序列化时出错   类型对象[我的对象类型在这里]。   根级别的数据无效。   第1行,第1位。

我做错了什么?我尝试重写Deserialize函数几次,它似乎总是出现同样的错误。谢谢!

哦,这就是我调用2个函数的方式:

SomeObject so = new SomeObject();
string temp = SerializationManager.Serialize(so);
so = (SomeObject)SerializationManager.Deserialize(temp, typeof(SomeObject));

4 个答案:

答案 0 :(得分:134)

以下是我一直以来的做法:

    public static string Serialize(object obj) {
        using(MemoryStream memoryStream = new MemoryStream())
        using(StreamReader reader = new StreamReader(memoryStream)) {
            DataContractSerializer serializer = new DataContractSerializer(obj.GetType());
            serializer.WriteObject(memoryStream, obj);
            memoryStream.Position = 0;
            return reader.ReadToEnd();
        }
    }

    public static object Deserialize(string xml, Type toType) {
        using(Stream stream = new MemoryStream()) {
            byte[] data = System.Text.Encoding.UTF8.GetBytes(xml);
            stream.Write(data, 0, data.Length);
            stream.Position = 0;
            DataContractSerializer deserializer = new DataContractSerializer(toType);
            return deserializer.ReadObject(stream);
        }
    }

答案 1 :(得分:34)

其他解决方案是:

public static T Deserialize<T>(string rawXml)
{
    using (XmlReader reader = XmlReader.Create(new StringReader(rawXml)))
    {
        DataContractSerializer formatter0 = 
            new DataContractSerializer(typeof(T));
        return (T)formatter0.ReadObject(reader);
    }
}

一句话:有时会发生原始xml包含例如:

<?xml version="1.0" encoding="utf-16"?>

当然你不能使用其他例子中使用的UTF8编码。

答案 2 :(得分:33)

我最终做了以下工作并且有效。

public static string Serialize(object obj)
{
    using (MemoryStream memoryStream = new MemoryStream())
    {
        DataContractSerializer serializer = new DataContractSerializer(obj.GetType());
        serializer.WriteObject(memoryStream, obj);
        return Encoding.UTF8.GetString(memoryStream.ToArray());
    }
}

public static object Deserialize(string xml, Type toType)
{
    using (MemoryStream memoryStream = new MemoryStream(Encoding.UTF8.GetBytes(xml)))
    {
        XmlDictionaryReader reader = XmlDictionaryReader.CreateTextReader(memoryStream, Encoding.UTF8, new XmlDictionaryReaderQuotas(), null);
        DataContractSerializer serializer = new DataContractSerializer(toType);
        return serializer.ReadObject(reader);
    }
}

调用stream.GetBuffer()时,似乎主要问题出在Serialize函数中。调用stream.ToArray()似乎可以工作。

答案 3 :(得分:-3)

最适合XML反序列化

 public static object Deserialize(string xml, Type toType)
    {

        using (MemoryStream memoryStream = new MemoryStream(Encoding.UTF8.GetBytes(xml)))
        {
            System.IO.StreamReader str = new System.IO.StreamReader(memoryStream);
            System.Xml.Serialization.XmlSerializer xSerializer = new System.Xml.Serialization.XmlSerializer(toType);
            return xSerializer.Deserialize(str);
        }

    }