Question

What is the best way to “reset” a Dictionary<int, bool> type of structure (set all values to true or false). Currently I’m using a ToDictionary() extension method. Is there a way to do this by reusing the current instance?

This code throws an exception:

[TestFixture]
public class Sample
{
    [Test]
    public void SampleTest()
    {
        var dictionary = new Dictionary<int, bool>{{1, false}, {2, true}, {3, false}};
        foreach (var key in dictionary.Keys)
        {
            dictionary[key] = true;
        }

        Assert.That(dictionary[3], Is.True);
    }
}

Answer 1

foreach (int key in dictionary.Keys.ToList())
    dictionary[key] = true;