How to Serialize a Class with a Dictionary Member in .NET 2.0?

Contains serialization methods for dictionary member classes under .NET 2.0

This article extends a previous discussion on the issue of serializing classes containing dictionary members. This class contains three attributes: guiPath, configPath and mappedDrives. mappedDrives is a dictionary mapping drive letters to network paths.

However, when serializing or deserializing the class, the user receives the following error:

Unable to serialize member App.Configfile.mappedDrives

This error occurs because for some reason, generic dictionaries in .NET 2.0 are not XML serializable.

Solution

To solve this problem, users can use a custom serializable dictionary class. Paul Welter provides such a class on his blog:

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

[XmlRoot("dictionary")]
public class SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, IXmlSerializable
{
    // 部分代码省略 ...
}

This class implements the IXmlSerializable interface, allowing it to be serialized and deserialized. Users can then use this custom dictionary class in their main class:

// ...

public Dictionary<string, string> mappedDrives = new SerializableDictionary<string, string>();

// ...

This should allow the class to be serialized and deserialized correctly.

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