CODEWITHSUNDEEP
c#asp.net-coreblazorsignalr
PriyankaKarthikeyan
PriyankaKarthikeyan

Reputation: 23

SignalR causing null reference exception while adding custom dialog services

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

Upvotes: 2

Views: 202

Answers (1)

Jason Pan
Jason Pan

Reputation: 21873

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);
        }
    }
}

Upvotes: 1

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