有一個錯誤反映了類型 - XML序列化問題

Question

我有一個Dictionary對象需要寫入XML文件。 字典包含String類型作為Key，自定義類的Object（從System.Windows.Forms.Control派生）作為Value。

namespace SharpFormEditorDemo
{
    [Serializable]
    public static class common
    {

    public static Dictionary<String,CommonControl > dicControls = new Dictionary<string, CommonControl>();

    public static Object objSelected = new Object();
    public static int ctrlId = 0;

    //The serialization and Deserialization methods.
    public static void Serialize(XmlTextWriter xmlTextWriter,Dictionary<String,CommonControl> dic)
    {
        xmlTextWriter.WriteStartDocument();
        ControlSerializer file = new ControlSerializer(dic);
        XmlSerializer xmlSerializer = new XmlSerializer(typeof(ControlSerializer));
        xmlSerializer.Serialize(xmlTextWriter, file);

        xmlTextWriter.WriteEndDocument();
    }
}

CommonControl類是這樣的

namespace SharpFormEditorDemo
{

public class CommonControl : System.Windows.Forms.Control 
{

    //private List<String> controls;
    private String sql;
    private int minVal; //Minimum value for a field
    private int maxVal; //Maximum value for a field
    private string displayValue; //Display Value        
    private string keyValue; //Key Value
    private string clickEvent; //Click event
    private string selectedIndexChangeEvent; //Combo box event.
    private string validateEvent; //Validated event.



    public string SelectedIndexChangeEvent
    {
        get { return selectedIndexChangeEvent; }
        set { selectedIndexChangeEvent = value; }
    }

    public string ClickEvent
    {
        get { return clickEvent; }
        set { clickEvent = value; }
    }

    public string ValidateEvent
    {
        get { return validateEvent; }
        set { validateEvent = value; }
    }

    public string KeyValue
    {
        get { return keyValue; }
        set { keyValue = value; }
    }

    public string DisplayValue
    {
        get { return displayValue; }
        set { displayValue = value; }
    }

    public int MinVal
    {
        get { return minVal; }
        set { minVal = value; }
    }       

    public int MaxVal
    {
        get { return maxVal; }
        set { maxVal = value; }
    }     

    public String Sql
    {
        get { return sql; }
        set { sql = value; }
    }

    //public List<String> Controls
    //{
    //    get { return controls; }
    //    set { controls = value; }
    //}
}
}

CommonControl類是從Controls類派生的。

我想要做的是將上述字典寫入XML文件。

[Serializable]
public class ControlSerializer : ISerializable
{
    public ControlSerializer()
    {
    }


    private Dictionary<String, CommonControl> dicCtrl;

    public Dictionary<String, CommonControl> DicCtrl
    {
        get { return dicCtrl; }
        set { dicCtrl = value; }
    }


    public ControlSerializer(Dictionary<String, CommonControl> dic)
    {           
        this.DicCtrl = dic;
    }

    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        throw new NotImplementedException();
    }

}

因為我正在使用ControlSerializer類

並稱之為這樣

 try
        {
            XmlTextWriter xlw = new XmlTextWriter(@"D:\Test.xml", null);
            common.Serialize(xlw, common.dicControls);
        }
        catch (Exception exShow)
        {

問題是我得到一個例外，說“反映類型為'SharpFormEditorDemo.ControlSerializer'的錯誤。”

但我正在使用typeof運算符獲取類型。 感到困惑的是為什么會這樣。 對不起，如果我太長，但想要全面了解。

謝謝

Answer 1

通用詞典不能是XmlSerialized。 您獲得的錯誤是由公共屬性DicCtrl引起的。

• 使用[XmlIgnore]屬性在序列化時跳過此屬性（可能不是您想要的）。
• 將屬性的類型更改為可序列化的類型，例如List<T>
• 查找或實現可序列化的字典
• 或者實現IXmlSerializable

BTW [Serializable]屬性僅用於二進制序列化。 Xml序列化不需要它。

Answer 2

伙計們......在網上給我一點幫助，我找到了一個解決方案..

我不得不添加另一個課程

[XmlRoot("dictionary")]
public class SerializableDictionary<TKey, TValue>: Dictionary<TKey, TValue>, IXmlSerializable
{      

    #region IXmlSerializable Members
    public System.Xml.Schema.XmlSchema GetSchema()
    {
        return null;
    }


    public void ReadXml(System.Xml.XmlReader reader)
    {
        XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
        XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue)); 

        bool wasEmpty = reader.IsEmptyElement;
        reader.Read(); 

        if (wasEmpty)
            return; 

        while (reader.NodeType != System.Xml.XmlNodeType.EndElement)
        {
            reader.ReadStartElement("item");
            reader.ReadStartElement("key");
            TKey key = (TKey)keySerializer.Deserialize(reader);
            reader.ReadEndElement();
            reader.ReadStartElement("value");
            TValue value = (TValue)valueSerializer.Deserialize(reader);
            reader.ReadEndElement();
            this.Add(key, value);
            reader.ReadEndElement();
            reader.MoveToContent();
        }

        reader.ReadEndElement();
    }



    public void WriteXml(System.Xml.XmlWriter writer)
    {
        XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
        XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue)); 

        foreach (TKey key in this.Keys)
        {
            writer.WriteStartElement("item");
            writer.WriteStartElement("key");
            keySerializer.Serialize(writer, key);
            writer.WriteEndElement();
            writer.WriteStartElement("value");
            TValue value = this[key];
            valueSerializer.Serialize(writer, value);
            writer.WriteEndElement();
            writer.WriteEndElement();
        }

    }

    #endregion

}

然后使用SerializableDictionary對象而不是普通的Dictionary。 同樣在我的CommonControls類中，我必須使用以下方法實現“IXmlSerializable”。

 #region IXmlSerializable Members

    public System.Xml.Schema.XmlSchema GetSchema()
    {
        throw new NotImplementedException();
    }

    public void ReadXml(XmlReader reader)
    {
        throw new NotImplementedException();
    }

    public void WriteXml(XmlWriter writer)
    {
        throw new NotImplementedException();
    }

    #endregion

現在整個事情都運轉正常。 感謝大家。 ！

Answer 3

我想你會發現無法用XmlSerializer序列化Dictionary

Answer 4

我使用System.Runtime.Serialization.dll DataContractSerializer 。 使用兩個Dictionary屬性對我的類進行序列化/反序列化，沒有任何問題。