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How to use LINQ in C# to filter a return database list using values from a string array.

Posted on 2014-09-23
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Last Modified: 2016-02-16
I would like to  use LINQ in C# to filter a list of objects using values from a string array. How can i get the list where it only returns the objects that match values in my String Array?


example:
string[] stringArray = { "Bob", "Joe", "Dan", "Rick" };

var newlist = DataObject.where(x => x.names.Contains("any names from my string Array");


note; The Names is a delimited list
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Question by:bojeff30
2 Comments
 
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Accepted Solution

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it_saige earned 2000 total points
ID: 40339359
You would need something like:

			List<string> namesArray = new List<string>() { "Bob", "Joe", "Dan", "Rick" };
			List<ComplexData> DataObject = new List<ComplexData>();
			DataObject.Add(new ComplexData() { Account = 1, City = "Ramhurst", Names = "Rick,Peter,Paul" });
			DataObject.Add(new ComplexData() { Account = 2, City = "Paulson", Names = "David,Dan,Daryl" });
			DataObject.Add(new ComplexData() { Account = 3, City = "Petersburg", Names = "Nuk,Nit,Nat" });
			DataObject.Add(new ComplexData() { Account = 4, City = "Salsburg", Names = "Joe,Diane,Tracy" });
			DataObject.Add(new ComplexData() { Account = 5, City = "Templeton", Names = "Larry,Nancy,Bob" });
			var newList = (from item in DataObject
						from name in namesArray
						where item.Names.Contains(name)
						select item);
			foreach (var item in newList)
			{
				MessageBox.Show(string.Format("Account - {0}; City - {1}; Names - {2}", item.Account, item.City, item.Names));
			}

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ComplexData class:
	public class ComplexData
	{
		public string Names { get; set; }
		public string City { get; set; }
		public int Account { get; set; }
	}

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HTH,

-saige-
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Author Comment

by:bojeff30
ID: 40339599
Thank you so much! This worked perfectly!
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