C# 跳过反序列化时的无效值 问题:

是否可以在反序列化时跳过无效值？例如，如果用户在xml文件中插入了无效值

类定义 序列化方法 XML内容（有效）

正常的
假的

XML内容（无效）

哞
假的

评论

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我不想“重置”用户设置，我只想跳过无效的内容并使用默认值。否则，我将使用try/catch构造并重新生成xml文件。

不幸的是，当遇到未知的

enum

值时，无法抑制

XmlSerializer

中的异常。相反，您需要为此创建一个

string

-值属性，并序列化该属性而不是

enum

-值属性：

[Serializable]
public class Settings
{
    internal static XmlSerializer Serializer = new XmlSerializer(typeof(Settings));

    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
    [XmlElement("Difficulty")]
    public string XmlDifficulty
    {
        get
        {
            return Difficulty.ToString();
        }
        set
        {
            try
            {
                Difficulty = (Difficulty)Enum.Parse(typeof(Difficulty), value);
            }
            catch
            {
                Debug.WriteLine("Invalid difficulty found: " + value);
                Difficulty = Difficulty.Normal;
            }
        }
    }

    [XmlIgnore]
    public Difficulty Difficulty { get; set; }

    public Boolean CaptureMouse { get; set; }

    internal void loadDefaults()
    {
        this.Difficulty = Difficulty.Normal;
        this.CaptureMouse = false;
    }
}

---

嗯，这仍然是一个比我想象的更好的解决方案。谢谢；）您仍然可以使用XDocument或XmlDocument手动编写自定义序列化/反序列化方法。简单的单元测试可以确保往返（序列化和反序列化）不会导致数据丢失。只需比较所有公共属性。

// ...
if(!File.Exists(GameDir + SettingsFile)) {
    Settings = new Settings();
    Settings.loadDefaults();
    TextWriter writer = new StreamWriter(GameDir + SettingsFile);
    Settings.Serializer.Serialize(writer, Settings);
    writer.Close();
    writer.Dispose();
} else {
    TextReader reader = new StreamReader(GameDir + SettingsFile);
    Settings = (Settings)Settings.Serializer.Deserialize(reader);
}
// ...

<?xml version="1.0" encoding="utf-8"?>
<Settings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Difficulty>Normal</Difficulty>
  <CaptureMouse>false</CaptureMouse>
</Settings>

<?xml version="1.0" encoding="utf-8"?>
<Settings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Difficulty>Moo</Difficulty>
  <CaptureMouse>false</CaptureMouse>
</Settings>

[Serializable]
public class Settings
{
    internal static XmlSerializer Serializer = new XmlSerializer(typeof(Settings));

    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
    [XmlElement("Difficulty")]
    public string XmlDifficulty
    {
        get
        {
            return Difficulty.ToString();
        }
        set
        {
            try
            {
                Difficulty = (Difficulty)Enum.Parse(typeof(Difficulty), value);
            }
            catch
            {
                Debug.WriteLine("Invalid difficulty found: " + value);
                Difficulty = Difficulty.Normal;
            }
        }
    }

    [XmlIgnore]
    public Difficulty Difficulty { get; set; }

    public Boolean CaptureMouse { get; set; }

    internal void loadDefaults()
    {
        this.Difficulty = Difficulty.Normal;
        this.CaptureMouse = false;
    }
}