4

我有许多测试实现接口 IDoTest 的列表，我想将它们存储在文件中。我也想从这个文件中读取。

简单地使用XmlSerializer将对象存储在我的 IDoTest 列表中似乎很自然。但是当我这样做时，我会感到模糊，很抱歉我不能在 System.Xml.Serialization.TypeDesc.CheckSupported() 附近犯那个错误

XmlSerializer 只能做一些琐碎的工作吗？还是我错过了什么？他们在 MSDN上谈论自定义序列化。这是我的简化代码示例。

using System;
using System.Collections.Generic;
using System.IO;
using System.Xml.Serialization;

namespace ConsoleApplication1
{
    public interface IDoTest
    {
        void DoTest();
        void Setup();
    }
    internal class TestDBConnection : IDoTest
    {
        public string DBName;
        public void DoTest()
        {
            Console.WriteLine("DoHardComplicated Test");
        }
        public void Setup()
        {
            Console.WriteLine("SetUpDBTest");
        }
    }
    internal class PingTest : IDoTest
    {
        public string ServerName;
        public void DoTest()
        {
            Console.WriteLine("MaybeDoAPing");
        }
        public void Setup()
        {
            Console.WriteLine("SetupAPingTest");
        }
    }     

    internal class Program
    {
        private static void Main(string[] args)
        {

            TestDBConnection Do1 = new TestDBConnection { DBName = "SQLDB" };
            PingTest Do2 = new PingTest { ServerName = "AccTestServ_5" };
            List<IDoTest> allTest = new List<IDoTest> { Do1, (Do2) };
            // Now I want to serialize my list. 
            // Its here where I get the error at allTest
            XmlSerializer x = new XmlSerializer(allTest.GetType());
            StreamWriter writer = new StreamWriter("mySerializedTestSuite.xml");
            x.Serialize(writer, allTest); 

        }
    }
}
4

3 回答 3

3

XmlSerializer不能序列化一个interface，并且通过扩展，它不能序列化List<>某个接口的一个。它只能序列化具体的对象类型。

假设您可能希望在某个时候反序列化对象，并且如果它只输出与该接口有关的信息，则不能保证存在所有必要的数据来重建原始对象。

如果您能够使用抽象基类并显式提供可能出现在列表中的每种可能类型的对象，则这篇文章显示了一种潜在的解决方法。

于 2013-03-30T20:22:46.400 回答
1

I followed the link that StriplingWarrior gave and found this excellent answer. https://stackoverflow.com/a/15089253/648076 from webturner

I changed his implementation and made a class class ListOfToDo that implemented both List and IXmlSerializable. That worked! Here is my changed code.

using System;
using System.Collections.Generic;
using System.IO;
using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;

namespace ConsoleApplication1
{
    public interface IDoTest
    {
        void DoTest();
        void Setup();
    }
    public class TestDBConnection : IDoTest
    {
        public string DBName;
        public void DoTest()
        {
            Console.WriteLine("DoHardComplicated Test");
        }
        public void Setup()
        {
            Console.WriteLine("SetUpDBTest");
        }
    }
    public class PingTest : IDoTest
    {
        public string ServerName;
        public void DoTest()
        {
            Console.WriteLine("MaybeDoAPing");
        }
        public void Setup()
        {
            Console.WriteLine("SetupAPingTest");
        }
    }

    public class ListOfToDo : List<IDoTest>, **IXmlSerializable**
    {    
        #region IXmlSerializable
        public XmlSchema GetSchema(){ return null; }

        public void ReadXml(XmlReader reader)

           {
               reader.ReadStartElement("ListOfToDo");
               while (reader.IsStartElement("IDoTest"))
            {
                Type type = Type.GetType(reader.GetAttribute("AssemblyQualifiedName"));
                XmlSerializer serial = new XmlSerializer(type);

                reader.ReadStartElement("IDoTest");
                this.Add((IDoTest)serial.Deserialize(reader));
                reader.ReadEndElement(); //IDoTest
            }
            reader.ReadEndElement(); //IDoTest
        }

        public void WriteXml(XmlWriter writer)
        {
            foreach (IDoTest test in this)
            {
                writer.WriteStartElement("IDoTest");
                writer.WriteAttributeString("AssemblyQualifiedName", test.GetType().AssemblyQualifiedName);
                XmlSerializer xmlSerializer = new XmlSerializer(test.GetType());
                xmlSerializer.Serialize(writer, test);
                writer.WriteEndElement();
            }
        }
         #endregion
    }

    internal class Program
    {
        private static void Main(string[] args)
        {

            TestDBConnection Do1 = new TestDBConnection { DBName = "SQLDB" };
            PingTest Do2 = new PingTest { ServerName = "AccTestServ_5" };
            ListOfToDo allTest = new ListOfToDo { Do1, (Do2) };

            // Now I want to serialize my list. 
            // Its here where I get the error at allTest
            XmlSerializer x = new XmlSerializer(allTest.GetType());
            StreamWriter writer = new StreamWriter("mySerializedTestSuite.xml");
            x.Serialize(writer, allTest); 
            writer.Flush();
            writer.Close();

            //Read it aka deserialize
            {
                var xmlSerializer = new XmlSerializer(typeof(ListOfToDo));
                var xmlReader = XmlReader.Create(new StreamReader("mySerializedTestSuite.xml"));
                ListOfToDo readWhatToTest = (ListOfToDo)xmlSerializer.Deserialize(xmlReader);
                xmlReader.Close();
            }


        }
    }
}

Output will then be:

    <?xml version="1.0" encoding="utf-8"?>
<ListOfToDo>
  <IDoTest AssemblyQualifiedName="ConsoleApplication1.TestDBConnection, ConsoleApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
    <TestDBConnection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <DBName>SQLDB</DBName>
    </TestDBConnection>
  </IDoTest>
  <IDoTest AssemblyQualifiedName="ConsoleApplication1.PingTest, ConsoleApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
    <PingTest xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <ServerName>AccTestServ_5</ServerName>
    </PingTest>
  </IDoTest>
</ListOfToDo>
于 2013-03-30T21:26:49.183 回答
0

不确定这是否可能是您的问题的原因，但在这两个示例中，他们确实使用typeof(T)而不是T.GetType()

http://msdn.microsoft.com/en-us/library/71s92ee1.aspx

我无法使用 XmlSerializer 序列化 C# 中的对象列表

于 2013-03-30T20:15:57.703 回答