c# 深拷贝各种实现

1：利用反射实现

public static T DeepCopy<T>(T obj)
{
    //如果是字符串或值类型则直接返回
    if (obj is string || obj.GetType().IsValueType) return obj;

    object retval = Activator.CreateInstance(obj.GetType());
    FieldInfo[] fields = obj.GetType().GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
    foreach (FieldInfo field in fields)
    {
        try { field.SetValue(retval, DeepCopy(field.GetValue(obj))); }
        catch { }
    }
    return (T)retval;
}

2：利用xml序列化和反序列化实现

  public T DeepCopy<T>(T obj)
        {
            object retval;
            using (MemoryStream ms = new MemoryStream())
            {
                XmlSerializer xml = new XmlSerializer(typeof(T));
                xml.Serialize(ms, obj);
                ms.Seek(0, SeekOrigin.Begin);
                retval = xml.Deserialize(ms);
                ms.Close();
            }
            return (T)retval;
        }

3：利用二进制序列化和反序列化实现

public static T DeepCopy<T>(T obj)
{
    object retval;
    using (MemoryStream ms = new MemoryStream())
    {
        BinaryFormatter bf = new BinaryFormatter();
        //序列化成流
        bf.Serialize(ms, obj);
        ms.Seek(0, SeekOrigin.Begin);
        //反序列化成对象
        retval = bf.Deserialize(ms);
        ms.Close();
    }
    return (T)retval;
}

4：利用silverlight DataContractSerializer实现，用于在silverlight 客户端使用

public static T DeepCopy<T>(T obj)
        {
            object retval;
            using (MemoryStream ms = new MemoryStream())
            {
                DataContractSerializer ser = new DataContractSerializer(typeof(T));
                ser.WriteObject(ms, obj);
                ms.Seek(0, SeekOrigin.Begin);
                retval = ser.ReadObject(ms);
                ms.Close();
            }
            return (T)retval;

补充：第一个已经通过递归实现了深拷贝。