Remove duplicate entries from string array

karenpayne

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4 Mar 2010CPOL

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This VS2008 or higher extension uses a LINQ statement to remove duplicate items from a string array but is not case sensitive, also you might like to leave the sort/order-by in the extension or remove it.ExampleDim Names() As String = {"Bob", "Mary", "bob", "Bob", "Jane", "Kevin",...

Dim Names() As String = {"Bob", "Mary", "bob", "Bob", "Jane", "Kevin", "Jane"}
Names = Names.RemoveDuplicates
For Each Name As String In Names
    Console.WriteLine(Name)
Next

Returns

bob
Bob
Jane
Kevin
Mary

Extension (place in code module)

XML

<System.Diagnostics.DebuggerStepThrough()> _
<System.Runtime.CompilerServices.Extension()> _
Public Function RemoveDuplicates(ByVal sender As String()) As String()
    Return (From value In sender Select value Distinct Order By value).ToArray
End Function

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By

karenpayne

Instructor / Trainer

United States

Microsoft MVP, Uses Microsoft Visual Studio ecosystem building web and desktop solutions

Private Sub CodeIHaveNoControlOver() Dim Values As String() = {"Bob", "Mary", "bob", "Bob", "Jane", "Kevin", "Jane"} Demo(Values) End Sub Private Sub Demo(ByVal Values() As String) Dim query = (From value In Values Select value Distinct Order By value).ToArray ComboBox1.Items.AddRange(query) End Sub

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Remove duplicate entries from string array

License

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