adding properties together from list of objects using LINQ

Question

Looking to see if there is a simpler way to achieve this. I would love if I could keep the return as a one-line LINQ expression. I want to grab the total number of hints used, which can be more than one.

public int hintsUsed
{
 get
 {
 int i = 0;
 questions.ForEach(q => i += q.hintsUsed);
 return i;
 }
}

Answer 1

You can use the Sum function

public int HintsUsed => questions.Sum(q => q.hintsUsed);

By using an expression bodied member (since C# 6.0), you can even get rid of the get and the return keywords plus a few braces.

The code above is equivalent to

public int HintsUsed
{
 get
 {
 return questions.Sum(q => q.hintsUsed);
 }
}

Most of the LINQ-to-Objects functionality is provided by the Enumerable Class.

• Premier Bromanov: Ahh perfect, thank you. Sometimes its difficult to search for these things because I'm not sure which words to use. I will definitely use this in the future.