c# - "Both use the XML type name X, use XML attributes to specify a unique XML name and/or namespace for the type"怎么解决？

Question

我有以下枚举定义...

namespace ItemTable
{
  public enum DisplayMode
  {
    Tiles,
    Default
  }
}

namespace EffectiveItemPermissionTable
{
  public enum DisplayMode
  {
    Tree,
    FullPaths
  }
}

...然后我有以下类(class)...

public class Table<TDisplayMode>
  where TDisplayMode: struct
{
  // public
    public TDisplayMode DisplayMode
    { 
      get { return mDisplayMode; }
      set { mDisplayMode = value; }
    }

  // private
    private TDisplayMode mDisplayMode;
}

public class ItemTable : Table<ItemTable.DisplayMode>
{}

public class EffectiveItemPermissionTable : Table<EffectiveItemPermissionTable.DisplayMode>
{}

public class UISettings
{
  public UISettings()
  {
    ItemTable = new ItemTable();
    EffectiveItemPermissionTable = new EffectiveItemPermissionTable();
  }

  public ItemTable ItemTable { get; set; }
  public EffectiveItemPermissionTable EffectiveItemPermissionTable { get; set; }
}

...当我尝试使用...序列化 UISettings 的实例时

System.Xml.Serialization.XmlSerializer lSerializer =
  new System.Xml.Serialization.XmlSerializer(typeof(UISettings));

...我收到以下错误:

Types 'UISettings.Table`1[EffectiveItemPermissionTable.DisplayMode]' and
'UISettings.Table`1[ItemTable.DisplayMode]' both use the XML type name,
'TableOfDisplayMode', from namespace ''.

Use XML attributes to specify a unique XML name and/or namespace for the type.

我已经尝试使用 XmlType 属性和网上发布的各种解决方案，但没有任何效果。如错误中所述，XML 类型名称始终是 TableOfDisplayMode。

目前唯一的解决方案是重命名其中一个枚举，例如到 DisplayMode_，但我觉得那很丑。

Answer 1

您需要提供 Namespace通过在 UISettings 类的属性上使用 XmlElement 属性:

public class UISettings
{
    public UISettings()
    {

        ItemTable = new ItemTable();
        EffectiveItemPermissionTable = new EffectiveItemPermissionTable();
    }
    [XmlElement(Namespace = "Item")]
    public ItemTable ItemTable { get; set; }
    [XmlElement(Namespace = "Permissions")]
    public EffectiveItemPermissionTable EffectiveItemPermissionTable { get; set; }
}

在这里应用时，这将是您的序列化输出:

<?xml version="1.0" encoding="utf-16"?>
<UISettings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">  
   <ItemTable xmlns="Item">    
      <DisplayMode>Tiles</DisplayMode>  
   </ItemTable>  
   <EffectiveItemPermissionTable xmlns="Permissions">    
       <DisplayMode>FullPaths</DisplayMode>  
   </EffectiveItemPermissionTable>
</UISettings>

或者，您可以为类型提供 namespace ，这可能更简洁:

[XmlType(Namespace="Item")]
public class ItemTable : Table<ItemTableNS.DisplayMode>
{ }

[XmlType(Namespace = "Permission")]
public class EffectiveItemPermissionTable : Table<EffectiveItemPermissionTableNS.DisplayMode>
{ }

这将序列化为:

<?xml version="1.0" encoding="utf-16"?>
<UISettings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <ItemTable>
    <DisplayMode xmlns="Item">Tiles</DisplayMode>
  </ItemTable>
  <EffectiveItemPermissionTable>
    <DisplayMode xmlns="Permission">FullPaths</DisplayMode>
  </EffectiveItemPermissionTable>
</UISettings>