Using Lambda with Dictionaries

Question

Hello,

I am trying to use LINQ to retrieve some data from a dictionary.

    var testDict = new Dictionary<int, string>();
    testDict.Add(1, "Apple");
    testDict.Add(2, "Cherry");

    var q1 = from obj in testDict.Values.Where(p => p == "Apple");
    var q2 = from obj in testDict.Where(p => p.Value == "Apple");

The above lines, q1 and q2, both result in a compiler error.

error CS0742: A query body must end with a select clause or a group clause

How do I go about using LINQ to find values in a dictionary?

Thank you,

Rick

Answer 1

Either

var q1 = from obj in testDict.Values where obj == "Apple" select obj;

or

var q1 = testDict.Where(p => p.Value == "Apple");

Answer 2

you have an extra "from obj in" in your statements that isn't needed. Either remove that or change the .Where to the linq query syntax instead of the method syntax.

var q1 = from obj in testDict.Values
         where p == "Apple"
         select p;    
var q2 = testDict
         .Where(p => p.Value == "Apple")
         .Select(p => p.Value);

Answer 3

Wow! You guys are fast.

Thank you so much.

Rick