using float + Lambda Expressions C#

var distances = new Dictionary<char, float>();
var nodes = new List<char>();

I have this line to find the smallest distance 

nodes.Sort((x, y) => distances[x] - distances[y]);

When I use int it works well, but when I used float I got a message

cannot convert lambda expression to type 'System.Collections.Generic.IComparer' because it is not a delegate type

Do you have an idea?

Jon Skeet
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You can't convert your lambda expression into a Comparison<char> (which is what you want) because it returns a float - you've effectively got a Func<char, char, float> there, whereas Comparison<char> is closer to Func<char, char, int>.

The simplest approach is to use float.CompareTo:

nodes.Sort((x, y) => distances[x].CompareTo(distances[y]));

Or if you don't need to sort in-place, you could use LINQ:

var sorted = nodes.OrderBy(x => distances[x]);

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