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派生类的C#XML序列化

derived class xml c#

111111 · 技术社区 · 14 年前

嗨,我正在尝试序列化一个从类派生的对象数组,我一直在用c#遇到同样的错误。非常感谢您的帮助。

显然这个例子已经被缩小了,因为在现实世界中,这个帖子的形状会包含大量不同的形状。

namespace XMLInheritTests
{
    class Program
    {
        static void Main(string[] args)
        {
            Shape[] a = new Shape[1] { new Square(1) };

            FileStream fS = new FileStream("C:\\shape.xml",
                                        FileMode.OpenOrCreate);
            XmlSerializer xS = new XmlSerializer(a.GetType());
            Console.WriteLine("writing");
            try
            {
                xS.Serialize(fS, a);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.InnerException.ToString());
                Console.ReadKey();
            }
            fS.Close();
            Console.WriteLine("Fin");
        }
    }
}

形状.cs

namespace XMLInheritTests
{
    public abstract class Shape
    {
        public Shape() { }
        public int area;
        public int edges;
    }
}

方块字.cs

namespace XMLInheritTests
{
    public  class  Square : Shape
    {
        public int iSize;
        public Square() { }

        public Square(int size)
        {
            iSize = size;
            edges = 4;
            area = size * size;
        }
    }
}

错误: System.InvalidOperationException:不应为XMLInheritTests.Square类型。使用xmlclude或SoapInclude属性指定静态未知的类型。

位于Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterShapeA

非常感谢

2 回复 | 直到 14 年前

Marc Gravell 14 年前

[XmlInclude(typeof(Square))]
public abstract class Shape {...}

XmlSerializer 构造器,但是:那就是缓存和重用序列化程序实例;否则,您将使动态创建的程序集大出血。当您使用只接受 Type ,但不适用于其他重载。

111111 14 年前

解决方案:

class Program
    {
        static void Main(string[] args)
        {
            Shape[] a = new Shape[2] { new Square(1), new Triangle() };

            FileStream fS = new FileStream("C:\\shape.xml",FileMode.OpenOrCreate);

            //this could be much cleaner
            Type[] t = { a[1].GetType(), a[0].GetType() };


            XmlSerializer xS = new XmlSerializer(a.GetType(),t);
            Console.WriteLine("writing");
            try
            {
                xS.Serialize(fS, a);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.InnerException.ToString());
                Console.ReadKey();
            }
            fS.Close();
            Console.WriteLine("Fin");
        }
    }

namespace XMLInheritTests
{
    [XmlInclude(typeof(Square))]
    [XmlInclude(typeof(Triangle))]
    public abstract class Shape
    {
        public Shape() { }
        public int area;
        public int edges;
    }
}