CODEWITHSUNDEEP
c#.netreflection
AstroSharp
AstroSharp

Reputation: 1902

Find properties of an object that are dictionary whose keys are of certain type

I need to write an extension method with generic type T that goes through all properties of an object and does something to those that are dictionaries whose values are of type t:

public static T DoDictionaries<T,t>(T source, Func<t,t> cleanUpper)
{

 Type objectType = typeof(T);
 List<PropertyInfo> properties = objectType.GetProperties().ToList();
 properties.Each(prop=>
      {
        if (typeof(Dictionary<????, t>).IsAssignableFrom(prop.PropertyType))
           {
                Dictionary<????, t> newDictionary = dictionary
                     .ToDictionary(kvp => kvp.Key, kvp => cleanUpper(dictionary[kvp.Key]));
                prop.SetValue(source, newDictionary);
           }
      });
 return source;
}

I cannot use another generic type ``k'' for type of dictionary keys since there can be many dictionaries with various key types in one object. Obviously, something different has to be done instead of the code above. I just can't figure out how to do this. Thanks

Upvotes: 0

Views: 942

Answers (1)

Vyacheslav Volkov
Vyacheslav Volkov

Reputation: 4742

public static TSource DoDictionaries<TSource, TValue>(TSource source, Func<TValue, TValue> cleanUpper)
    {
        Type type = typeof(TSource);

        PropertyInfo[] propertyInfos = type
            .GetProperties()
            .Where(info => info.PropertyType.IsGenericType &&
                           info.PropertyType.GetGenericTypeDefinition() == typeof (Dictionary<,>) &&
                           info.PropertyType.GetGenericArguments()[1] == typeof (TValue))
            .ToArray();

        foreach (var propertyInfo in propertyInfos)
        {
            var dict = (IDictionary)propertyInfo.GetValue(source, null);
            var newDict = (IDictionary)Activator.CreateInstance(propertyInfo.PropertyType);
            foreach (var key in dict.Keys)
            {
                newDict[key] = cleanUpper((TValue)dict[key]);
            }
            propertyInfo.SetValue(source, newDict, null);
        }

        return source;
    }

Upvotes: 2

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