StackExchange.Redis.IDatabase exists in two dlls

Question

I installed Redis StackExchange nuget and things worked fine. But then I installed RedisSessionStateProvider nuget, which installed StackExchange.Redis.StrongName along with it.

Now I am getting the following error,

Error 107 The type 'StackExchange.Redis.IDatabase' exists in both 'e:\Source\packages\StackExchange.Redis.1.0.481\lib\net45\StackExchange.Redis.dll' and 'e:\Source\packages\StackExchange.Redis.StrongName.1.0.481\lib\net45\StackExchange.Redis.StrongName.dll' E:\Source\MyApp\Helpers\RedisHelper\StackExchangeRedisExtensions.cs 13 37 MyApp

Why is this?

score 10 · Answer 1 · answered Nov 30 '15 at 18:30

There's a lot of confusion between the strong-named dll and the non-strong-named dll namespaces.

You can easily solve this by using extern alias.

Right click on project references and pick the dll you want to refer, go to properties window. Then, change the Aliases field value to anything you want. E.g: "Redis".

Then go to your consumer source-file and add:

extern alias Redis;

using System;
// ... other references
using Redis::StackExchange.Redis;

namespace Foo
{
    public class Program
    {
        public static void Main(string[] args)
        {
            using (ConnectionMultiplexer connection = ConnectionMultiplexer.Connect("myConn"))
            {
                // use StackExchange API here.
            }
        }
    }
}

There's also an issue on StackExchange's repository explaining more about StrongName vs Non-StrongName.

I can't seem to find that "Aliases" field you're talking about. Can you please be more detailed? — Shimmy Weitzhandler, Nov 26 '17 at 04:23
I just changed the Alias for StackExchange.Redis.StrongName from "global" to "RedisStrongName", rebuilt the solution and there were no errors — Kappacake, May 08 '18 at 11:24

score 4 · Accepted Answer · answered Jul 17 '15 at 10:23

4

Some methods/properties/interfaces are duplicated in above 2 dlls.

Remove StackExchange.Redis reference to resolve errors.

answered Jul 17 '15 at 10:23

Rohit

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score 0 · Answer 3 · answered Nov 26 '17 at 04:29

0

I faced this issue in an ASP.NET Core app, and this answer solved my issue quickly.

answered Nov 26 '17 at 04:29

Shimmy Weitzhandler

101,809
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Link-only answer is discouraged on SO. – spender Apr 04 '18 at 03:48
Did you check the link before downvoting? It's a SO answer. – Shimmy Weitzhandler Apr 07 '18 at 22:40
In which case, isn't this a dupe?... or a comment? – spender Apr 07 '18 at 22:54
1

The guidelines [here](https://meta.stackexchange.com/q/225370/133351) suggest that if one is to strip out the markup of an answer and no useful information remains, then it's a link-only answer. I believe this qualifies. – spender Apr 07 '18 at 23:29

StackExchange.Redis.IDatabase exists in two dlls

3 Answers3