使用 JavaScriptSerializer 和自定义 JavaScriptConverter 序列化和反序列化 Dictionary<int, object>

Question

你如何序列化和反序列化一个键为整数到JSON的字典，使用JavaScriptSerializer and a custom JavaScriptConverter?

对于那些不知道的人，JavaScripSerializer 不能开箱即用。

请注意，我对需要在序列化之前转换字典或使用其他序列化程序的解决方案不感兴趣（如果您是，您可能会看到 this post）。

UPDATE：为了消除歧义，我认为密钥在 JSON 中生成为字符串这一事实没有问题（因此 1 将变为“1” ).

Answer 1

/// <summary>
/// Implements JavaScript Serialization and Deserialization for instances of the Dictionary&lt;int, object&gt; type.
/// </summary>
public class IntDictionaryConverter : JavaScriptConverter
{
    /// <summary>
    /// Converts the provided dictionary into a Dictionary&lt;int, object&gt; object.
    /// </summary>
    /// <param name="dictionary">An IDictionary instance of property data stored as name/value pairs.</param>
    /// <param name="type">The type of the resulting object.</param>
    /// <param name="serializer">The JavaScriptSerializer instance.</param>
    /// <returns>The deserialized object.</returns>
    public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
    {
        // Validate arguments
        if (dictionary == null) throw new ArgumentNullException("dictionary");
        if (serializer == null) throw new ArgumentNullException("serializer");

        Dictionary<int, object> deserializedDictionary = new Dictionary<int, object>();
        foreach (KeyValuePair<string, object> entry in dictionary)
        {
            int intKey = 0;
            if (!int.TryParse(entry.Key, out intKey))
                throw new InvalidOperationException("Cannot deserialize the dictionary because of invalid number string");

            deserializedDictionary.Add(intKey, entry.Value);
        }

        return deserializedDictionary;
    }

    /// <summary>
    /// Builds a dictionary of name/value pairs.
    /// </summary>
    /// <param name="obj">The object to serialize.</param>
    /// <param name="serializer">The object that is responsible for the serialization.</param>
    /// <returns>An object that contains key/value pairs that represent the object’s data.</returns>
    public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
    {
        // Validate arguments
        if (obj == null) throw new ArgumentNullException("obj");
        if (serializer == null) throw new ArgumentNullException("serializer");

        // Get the dictionary to convert
        Dictionary<int, object> dictionary = (Dictionary<int, object>)obj;

        // Build the converted dictionary
        Dictionary<string, object> convertedDictionary = new Dictionary<string, object>();

        foreach (KeyValuePair<int, object> entry in dictionary)
            convertedDictionary.Add(entry.Key.ToString(), entry.Value);

        return convertedDictionary;
    }

    /// <summary>
    /// Gets a collection of the supported types.
    /// </summary>
    public override System.Collections.Generic.IEnumerable<Type> SupportedTypes
    {
        get
        {
            return new Type[]
            {
                typeof(Dictionary<int, object>)
            };
        }
    }
}

使用 JavaScriptSerializer 和自定义 JavaScriptConverter 序列化和反序列化 Dictionary<int, object>

Serialize and deserialize Dictionary<int, object> using JavaScriptSerializer and a custom JavaScriptConverter

c#

json

dictionary

serialization

javascriptserializer