Codepolice.net » array

IN queries with LINQ to SQL

Ola — Tue, 01 Jun 2010 13:33:12 +0000

This is another awesome feature in LINQ to SQL that i always forget about. Sometimes you have an array of strings or any other type and want to query the database for all values that have one of the values in the array.

string platform = "windows|linux";
string[] platformList = platform.Split('|');
itemQuery = from m in itemQuery
from p in m.PlattformItemRelations
where platformList.Contains(p.Plattform.Text.ToLower())
select m;

Ain’t that a beauty? I got this tip from Ron Connery so all the kudos to him.

Create a comma separated list with LINQ in C#

Ola — Tue, 20 Apr 2010 13:29:59 +0000

For some reason I always forget that you do not do .Join on your actual string array. So i might as well write it down here so i never forget about this again.

string mycommalist = string.Join(",", alternatives.Select(x=>x.Item.Name).ToArray())

Convert String Array to Int Array and vice versa in C#

Ola — Sat, 07 Nov 2009 15:35:17 +0000

Sometimes you want to convert arrays back and forth. This is to nice extension methods to convert a int array into a string array and vice versa.

public static class ExtensionMethods {

  public static string[] ToStringArray(this int[] intArray) {
   return Array.ConvertAll(intArray, delegate(int intParameter) { return intParameter.ToString(); });
  }

  public static int[] ToIntArray(this string[] strArray) {
   return Array.ConvertAll(strArray, delegate(string intParameter) { return int.Parse(intParameter.ToString()); });
  }
}