序列化和反序列化字典< int，object>使用JavaScriptSerializer和自定义JavaScriptConverter [英] Serialize and deserialize Dictionary<int, object> using JavaScriptSerializer and a custom JavaScriptConverter

问题描述

如何使用整数 的字典序列化和反序列化为JSON -us / library / system.web.script.serialization.javascriptserializer％28v = vs.110％29.aspxrel =nofollow noreferrer> JavaScriptSerializer 和一个自定义 JavaScriptConverter ？

How would you serialize and deserialize a dictionary whose keys are integers to JSON, using a JavaScriptSerializer and a custom JavaScriptConverter?

对于那些不知道的人，JavaScripSerializer不能开箱即用。

For those who don't know, the JavaScripSerializer cannot do this out of the box.

请注意，我不感兴趣一个解决方案，需要在序列化之前转换字典，或者使用另一个序列化程序（如果是，您可能会看到这篇文章）。

Please note that I'm not interested in a solution that requires converting the dictionary prior to serialization or that uses another serializer (if you are, you may see this post).

更新：删除任何歧义，我没有问题的事实关键在JSON中生成为一个字符串（因此1将变为1）。

UPDATE: to remove any ambiguity, I have no problem with the fact the key is generated as a string in JSON (so 1 will become "1").

推荐答案

/// <summary>
/// Implements JavaScript Serialization and Deserialization for instances of the Dictionary<int, object> type.
/// </summary>
public class IntDictionaryConverter : JavaScriptConverter
{
    /// <summary>
    /// Converts the provided dictionary into a Dictionary<int, object> 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>)
            };
        }
    }
}

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