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Forums > Building DNN Modules, Providers etc.

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Michael Tobisch

Veteran Member

Posts:929

1/21/2020 9:01 AM

Hi all,

I got a problem when replacing the Globals.NavigateURL() function with the new INavigationManager. What I have done:

namespace myNamespace
{
   public partial class myControl : PortalModuleBase, IActionable
   {
      [...]
      protected INavigationManager NavigationManager { get; }
      [...]
#region IActionable
      public ModuleActionCollection ModuleActions
      {
         get
         {
            ModuleActionCollection actions = new ModuleActionCollection();
            switch (someCondition)
            {
                case [...]:
                   [...]
                   break;
                case [...]:
                   actions.Add(GetNextActionID(),
                      Localization.GetString("ActionName", LocalResourceFile),
                      ModuleActionType.AddContent,
                      string.Empty,
                      string.Empty,
                      NavigationManager.NavigateURL(string.Empty, new string[] { "parameter=value" }),
                      false,
                      SecurityAccessLevel.Edit,
                      true,
                      false);
                   break;
                [...]
            }
            return actions;
         }
      }
#endregion
   }
}

I get a null reference exception (NavigationManager is null). What did I miss?

Happy DNNing!
Michael

Michael Tobisch
DNN★MVP

Brian Dukes

Advanced Member

Posts:129

1/21/2020 9:14 AM

Since WebForms don't have Dependency Injection support, you have to set that property (in an MVC or Web API controller, you would add INavigationManager as a constructor parameter, and the DI support would automatically supply it). In the control's constructor, set that property to DependencyProvider.GetRequiredService(). See this WebForms example or the Use the Service Locator section of Andrew's WebForm DI blog post.

DNN partner specializing in custom, enterprise DNN development https://engagesoftware.com/showcase

Michael Tobisch

Veteran Member

Posts:929

1/21/2020 11:42 PM

Thank you, Brian!

Happy DNNing!
Michael

Michael Tobisch
DNN★MVP

Michael Tobisch

Veteran Member

Posts:929

1/22/2020 2:57 AM

Hi Brian,

I tried this, but here I get an error: Method must have a return type.

Any idea? Do I have to install a NuGet package for that, and if yes, where do I find it? Is it this one? How can I install it from there? Or is it on the public NuGet feed (from Andrews blog: "Once DNN 9.4 is released it will be available on the public NuGet Feed."). Where is that? I did not find anything with the VS NuGet manager... :-(

Happy DNNing!
Michael

Michael Tobisch
DNN★MVP

Brian Dukes

Advanced Member

Posts:129

1/23/2020 8:39 AM

That's the constructor, so you'll need to add that line to your constructor, or if you don't already have a constructor, use the name of your control's class instead of View

DNN partner specializing in custom, enterprise DNN development https://engagesoftware.com/showcase

Brian Dukes

Advanced Member

Posts:129

1/23/2020 8:40 AM

Also, adding DNN 9.4 NuGet packages should automatically pull in DotNetNuke.Abstractions and DotNetNuke.DependencyInjection

DNN partner specializing in custom, enterprise DNN development https://engagesoftware.com/showcase

Michael Tobisch

Veteran Member

Posts:929

1/24/2020 1:52 AM

Posted By Brian Dukes on 23 Jan 2020 09:39 AM
That's the constructor, so you'll need to add that line to your constructor, or if you don't already have a constructor, use the name of your control's class instead of View

Stupid me! Too much trees to see the forest...

Thanks for your help.

Happy DNNing!
Michael

Michael Tobisch
DNN★MVP

Michael Tobisch

Veteran Member

Posts:929

1/24/2020 1:57 AM

Posted By Brian Dukes on 23 Jan 2020 09:40 AM
Also, adding DNN 9.4 NuGet packages should automatically pull in DotNetNuke.Abstractions and DotNetNuke.DependencyInjection

Hi Brian,

I still have problems, I can't find any DNN packages when browsing using the NuGet Packet Manager (in VS 2019).

Anyway, I set the references to DotNetNuke.Abstractions, DotNetNuke.DependenyInjection and Microsoft.Extensions.DependencyInjection manually, but still get this error:

      public MyView()
      {
         NavigationManager = DependencyProvider.GetRequiredService<INavigationManager>();
      }

'IServiceProvider' does not contain a definition for 'GetRequiredService' and no accessible extension method 'GetRequiredService' accepting a first argument of type 'IServiceProvider' could be found (are you missing a using directive or an assembly reference?)

Any ideas?

Happy DNNing!
Michael

Michael Tobisch
DNN★MVP

Brian Dukes

Advanced Member

Posts:129

1/24/2020 8:24 AM

GetRequiredService is an extension method, so you'll need to add using Microsoft.Extensions.DependencyInjection;.

Here's the DotNetNuke.Core NuGet package, which depends on DotNetNuke.DependencyInjection. In the NuGet dialog, is the Package source drop down mistakenly set to a custom feed instead of All or nuget.org?

DNN partner specializing in custom, enterprise DNN development https://engagesoftware.com/showcase

Michael Tobisch

Veteran Member

Posts:929

1/27/2020 5:09 AM

Hi Brian,

[...]
using DotNetNuke.DependencyInjection;
[...]
using Microsoft.Extensions.DependencyInjection;
[...]

are both set, but appear in gray (not used) in the source code.

There are also references to the two DLLs in the bin folder, DotNetNuke.DependencyInjection (v 9.4.4.0) and Microsoft.Extensions.DependencyInjection (v 2.1.1.0).

Happy DNNing!
Michael

Michael Tobisch
DNN★MVP

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