Using LINQ to Convert an Array Into a Generic List with C#
Wednesday 14 October 2009 @ 5:35 pm

 

This is just going to be a short post, but I bet it’s something I do a large number of times so I thought I’d blog it.  Say you get back from something like a web service an array of objects.

In my case this:

cmRateResult[] cmRateResults = TransiteUtils.MakeRateRequest(_cmRateRequest);

Then, I want to convert that into

List<cmRateResult]

We all know the foreach way of doing it, about 5 lines of code

var cmRateResultsList = new List<cmRateResult>(cmRateResults.Length);
 foreach (var r in cmRateResults)
 {
      cmRateResultsList.Add(r);
 }

Or, my preferred way is to use the LINQ for syntax as follows:

var recs = (from data in cmRateResults select data).ToList();
But, it’s nicer (IMHO) to do it with LINQ chaining, though exactly the same.  here it is:
var recs = cmRateResults.Select(data => data)).ToList()
Hope this helps!
 
Comments (5) - Posted in ASP.NET 3.5, C#, LINQ  



5 Responses to “Using LINQ to Convert an Array Into a Generic List with C#”

  1. Artem Govorov Says:
    October 14th, 2009 at 7:39 pm

    Not sure why you even need Select, this would work for you: cmRateResults.ToList()

  2. Peter Says:
    October 14th, 2009 at 8:52 pm

    Artem,
    I think I may just be link happy :)

  3. Pau Says:
    October 16th, 2009 at 6:11 am

    Or you could just do:
    List recs = new List(cmRateResults);

    Not sure if it’s any less performant than the .ToList(), but it’s 100% more readable than the Linq version.

  4. Pau Says:
    October 16th, 2009 at 6:12 am

    Erm, yeah that should have come out as:
    List<cmRateResult> recs = new List<cmRateResult>(cmRateResults);

  5. simi Says:
    December 29th, 2009 at 11:51 pm

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