Filtering out values from a C# Generic Dictionary

Question

I have a C# dictionary, Dictionary that I need to be filtered based on a property of MyObject.

For example, I want to

Answer 1

Here is a general solution, working not only for boolean properties of the values.

Method

Reminder: Extension methods must be placed in static classes. Dont forget the using System.Linq; statement at the top of the source file.

    /// 

    /// Creates a filtered copy of this dictionary, using the given predicate.
    /// 
    public static Dictionary Filter(this Dictionary dict,
            Predicate> pred) {
        return dict.Where(it => pred(it)).ToDictionary(it => it.Key, it => it.Value);
    }

Usage

Example:

    var onlyWithPositiveValues = allNumbers.Filter(it => it.Value > 0);