How do I add if statement in Linq statement

Question

How can I add the if statement that's commented in the code snippet below?

Dictionary<string,int> toReturn;
List<string> lookup = GetIt();

foreach (string test in lookup)
{
    var testDictionary = ToGroupDictionary(test);
    testDictionary.Keys.ToList().ForEach(k =>
        //if(true){add toReturn list}
    );
}

You would be better off just using a `foreach` loop -- [`.ForEach` is virtually a deprecated construct](http://stackoverflow.com/questions/10299458/is-the-listt-foreach-extension-method-gone). — Kirk Woll, Aug 26 '12 at 01:55

score 4 · Accepted Answer · answered Aug 26 '12 at 00:47

4

Just need to add curly braces:

testDictionary.Keys.ToList().ForEach(k => 
{
    //if(true){add toReturn list}
});

answered Aug 26 '12 at 00:47

Gabe

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Marc Bollinger · Answer 2 · 2012-08-26T07:35:09.043

3

Or add a Where clause

testDictionary
  .Keys
  .Where(k => conditional(k))
  .ForEach(k => { /* something else */ } );

edited Aug 26 '12 at 07:35

answered Aug 26 '12 at 00:49

Marc Bollinger

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1

Except for `ForEach` - `IEnumerable` doesn't support that extension. You do require `ToList` in this case. – Enigmativity Aug 26 '12 at 01:39
*sigh* And that's why we don't open our mouths without double-checking. Side note, while that makes sense (I knew there was a reason I wasn't intimately familiar with the `ForEach` extension), this provides a good justification for _why_ it doesn't support that method - http://blogs.msdn.com/b/ericlippert/archive/2009/05/18/foreach-vs-foreach.aspx – Marc Bollinger Aug 26 '12 at 07:37

How do I add if statement in Linq statement

2 Answers2