在 C# 和 XNA 4.0 中使用 XMLReader 时出错

Question

我正在尝试在 XNA 中为共享元素的字典编写 ContentTypeSerializer，我几乎已经完成了，但由于我对 XmlReader 类缺乏了解，在反序列化字典 xml 时出现错误。

我使用此函数来序列化字典（工作正常）：

protected override void Serialize(IntermediateWriter output,
                                      SharedResourceDictionary<T, K> value,
                                      ContentSerializerAttribute format)
    {
         foreach (KeyValuePair<T, K> item in value)// foreach (T item in value)
        {
            output.Xml.WriteStartElement(itemFormat.ElementName);
            output.WriteObject(item.Key, keyFormat);
            output.WriteSharedResource(item.Value, valueFormat);
            output.Xml.WriteEndElement();
        }
    }

它会生成以下 XML： http://pastebin.com/19fEteqV< /a> （抱歉，我无法以 xml 格式将其发布到此处）

最后我尝试使用此函数进行反序列化：

protected override SharedResourceDictionary<T, K> Deserialize(IntermediateReader input,
                                                         ContentSerializerAttribute format,
                                                         SharedResourceDictionary<T, K> existingInstance)
    {
        if (existingInstance == null)
            existingInstance = new SharedResourceDictionary<T, K>();

        while (input.MoveToElement(itemFormat.ElementName))
        {

            T key;

            input.Xml.ReadToDescendant(keyFormat.ElementName);
            key = input.ReadObject<T>(keyFormat);
            input.Xml.ReadToNextSibling(valueFormat.ElementName);
            input.ReadSharedResource(
                valueFormat, 
                (K value) => existingInstance.Add(key, value));
            input.Xml.MoveToElement();


        }

        return existingInstance;
    }

问题是，当我尝试加载时出现以下异常

Microsoft.Xna.Framework.Content.Pipeline.InvalidContentException was unhandled
  Message=XML element "Resources" not found.
  Source=Microsoft.Xna.Framework.Content.Pipeline
  StackTrace:
       at Microsoft.Xna.Framework.Content.Pipeline.Serialization.Intermediate.IntermediateReader.ReadSharedResources()
       at Microsoft.Xna.Framework.Content.Pipeline.Serialization.Intermediate.IntermediateSerializer.Deserialize[T](XmlReader input, String referenceRelocationPath)
       at SerializationTest.Modes.Mode4.Update(GameTime gameTime) in D:\All\Proyects\SerializationTest\SerializationTest\SerializationTest\Modes\Mode4.cs:line 87
       at Microsoft.Xna.Framework.Game.Update(GameTime gameTime)
       at SerializationTest.Game1.Update(GameTime gameTime) in D:\All\Proyects\SerializationTest\SerializationTest\SerializationTest\Game1.cs:line 78
       at Microsoft.Xna.Framework.Game.Tick()
       at Microsoft.Xna.Framework.Game.HostIdle(Object sender, EventArgs e)
       at Microsoft.Xna.Framework.GameHost.OnIdle()
       at Microsoft.Xna.Framework.WindowsGameHost.RunOneFrame()
       at Microsoft.Xna.Framework.WindowsGameHost.ApplicationIdle(Object sender, EventArgs e)
       at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at Microsoft.Xna.Framework.WindowsGameHost.Run()
       at Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun)
       at Microsoft.Xna.Framework.Game.Run()
       at SerializationTest.Program.Main(String[] args) in D:\All\Proyects\SerializationTest\SerializationTest\SerializationTest\Program.cs:line 15
  InnerException: 

：代码可以在此处找到。不想将帖子与所有内容聚集在一起。 如果有人有任何建议，我们将不胜感激。我很确定错误是在反序列化函数中解析 xml 时出现的，但我一生都找不到它。

感谢您抽出时间。

Answer 1

您没有读取 Item 标记的结束元素，因此读者在读取第一个键/值对后会变得疯狂。以下是更正后的 Deserialize 函数：

    protected override SharedResourceDictionary<T, K> Deserialize(IntermediateReader input,
                                                             ContentSerializerAttribute format,
                                                             SharedResourceDictionary<T, K> existingInstance)
    {
        if (existingInstance == null)
            existingInstance = new SharedResourceDictionary<T, K>();

        while (input.MoveToElement(Itemformat.ElementName))
        {
            T key;

            input.Xml.ReadToDescendant(Keyformat.ElementName);
            key = input.ReadObject<T>(Keyformat);
            input.Xml.ReadToNextSibling(Valueformat.ElementName);
            input.ReadSharedResource<K>(Valueformat, (K value) =>
            {
                existingInstance.Add(key, value);
            });
            input.Xml.ReadEndElement();
        }

        return existingInstance;
    }
}