Why do I get a compile error when calling string.Select in C#?

Question

In a different question (How to split a number into individual digits?), they call the Select method on a string. This site also suggests that it is possible.

However, when I try to do this using the code samples found in either of those places, I get a compile error. What could be causing this, and how can I use the Select method on a string?

score 12 · Answer 1 · answered Mar 22 '11 at 23:46

12

This is a LINQ method.

To use it, you need to be using .Net 3.5 or later, have referenced System.Core.dll, and have using System.Linq.

answered Mar 22 '11 at 23:46

SLaks

868,454
176
1,908
1,964

How do I reference System.Core.dll? – Patrick Mar 23 '11 at 00:06
Right-click the project, `Add Reference`. – SLaks Mar 23 '11 at 00:11

score 2 · Answer 2 · answered Mar 22 '11 at 23:47

2

Are you sure you have included the System.Linq reference?

using System.Linq;

answered Mar 22 '11 at 23:47

Josh Anderson

5,975
2
35
48

Yes I have "using System.Linq;" – Patrick Mar 23 '11 at 00:05

Crimsonland · Accepted Answer · 2011-03-23T00:08:58.533

1

Just Add a reference system.core.dll

1.In Solution Explorer, right-click on the project node and click Add Reference.

2.In the Add Reference dialog box, select the tab indicating the type of component you want to reference.

3.On .NET tab Select System.Core, then click OK.

And add using System.Linq on what the example you provided;

and make sure that youre project framework is 3.5 because it will not work on lower versions.

Regards

edited Mar 23 '11 at 00:08

answered Mar 22 '11 at 23:54

Crimsonland

2,194
3
24
42

Wrong; that's LINQ to SQL. You mean `System.Core.dll`. – SLaks Mar 23 '11 at 00:02
How do I add a reference to system.core.dll – Patrick Mar 23 '11 at 00:05

Why do I get a compile error when calling string.Select in C#?

3 Answers3