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We are trying to add custom services with SignalR, but it throws a null exception when we invoke the custom services. If we specify the component tag in mainLayout.razor like <BlazorApp3.DialogForms.Test/>, it is unable to run the project.

Sample: https://uploadnow.io/f/Y59l8d9

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Are we missing any configuration in the attached sample?

Need to run the signalR with custom dialog service sample without any exception

Jason Pan
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PriyankaKarthikeyan
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  • Does this answer your question? [What is a NullReferenceException, and how do I fix it?](https://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) – TheTanic Jul 10 '23 at 07:19
  • Please provide code samples that re-create the problem, not screenshots. – Mister Magoo Jul 10 '23 at 08:29

1 Answers1

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Change your DialogService class like below and the issue could be fixed.

using System;
using Microsoft.AspNetCore.Components;

namespace BlazorApp3.DialogForms
{
    public class DialogService
    {
        private event Action<DialogOptions> dialogInstance;

        public event Action<DialogOptions> DialogInstance
        {
            add => dialogInstance += value;
            remove => dialogInstance -= value;
        }
        public async Task Open(DialogOptions options)
        {
            // Invoke Test to update and show the dialog with options
            this.dialogInstance?.Invoke(options);
        }
    }
}
Jason Pan
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  • The solution is still not working. – PriyankaKarthikeyan Jul 11 '23 at 11:32
  • @PriyankaKarthikeyan Could you share more error details? – Jason Pan Jul 11 '23 at 12:21
  • The above solution handled the null exception, but I am facing an issue with running this sample. https://uploadnow.io/f/cy8kJSy – PriyankaKarthikeyan Jul 12 '23 at 12:43
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    Hi @PriyankaKarthikeyan, you are facing stackoverflowExceptions, right ? The names of your model and razor page are both `Test`, which encounters an ambiguity at runtime, please modify the name to solve the problem. – Jason Pan Jul 14 '23 at 07:31
  • Hi @PriyankaKarthikeyan If my reply is helpful, please accept it as answer(click on the mark option beside the reply to toggle it from greyed out to fill in.), see https://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work – Jason Pan Jul 14 '23 at 07:32