Why When I Type Array.Reverse I Get An Error Message The Type Or Namespace Name 'Reverse' Does Not Exist In The Namespace 'Array' (Are You Missing An Assembly Reference?)

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why when I type Array.Reverse I get an error message "The type or namespace name 'Reverse' does not exist in the namespace 'Array' (are you missing an assembly reference?)"

Posted 29-Jun-15 8:22am

Member 11800973

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[no name] 29-Jun-15 14:29pm

Since we can't see your code or anything as a guess, it might be that you are missing an assembly reference.

Suvendu Shekhar Giri 29-Jun-15 14:48pm

Make sure that you have added following using directive.
using System;
Or you can write like-
System.Array.Reverse

Matt T Heffron 29-Jun-15 14:56pm

Array is in the System namespace, so... are you missing a
using System;
??

LLLLGGGG 29-Jun-15 15:07pm

To be sure: If you are using VS, put your mouse cursor on the line of code underlined: you should see a small, red rectangle. Click on it and choose the best workaround for the error.

LG

Suvendu Shekhar Giri 30-Jun-15 3:07am

It's very unlikely but can check once whether your project have a reference to mscorlib.dll or not?

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Mark Miller · Answer 1 · 2015-07-01T11:20:00

Solution 2

See this: http://www.dotnetperls.com/array-reverse[^]

Posted 1-Jul-15 11:20am

Mark Miller

F-ES Sitecore · Answer 2 · 2015-06-29T08:35:00

Solution 1

You need this at the top of your page

using System.Linq;

This is .net 101, you should go through a book on .net and learn the fundamentals.

Posted 29-Jun-15 8:35am

F-ES Sitecore

Comments

Suvendu Shekhar Giri 29-Jun-15 14:39pm

System.Linq? Why?

Member 11800973 30-Jun-15 0:58am

I have it on top and I'm still getting that error message

Matt T Heffron 1-Jul-15 18:59pm

Array.Reverse() is in the System namespace, not System.Linq

phil.o · Answer 3 · 2015-07-01T15:56:00

"The type or namespace name 'Reverse' does not exist in the namespace 'Array' (are you missing an assembly reference?)"

If it considers Array as a namespace qualification, it means you did not import the System namespace.

Just place the line

C#

using System;

at the top of your code file.

Or use a plain qualification:

C#

System.Array.Reverse(myArray);

There is also a Reverse extension method defined in System.Linq namespace, but it acts differently: the former is a void method which acts directly on the array which is passed to it as a parameter, whereas the latter returns a IEnumerable<TSource> that you have to assign to your variable. This way:

C#

using System.Linq;
int[] myArray = new int[] { 1, 2, 3 };
myArray = myArray.Reverse().ToArray();