Merge pull request #48 from WiseTechGlobal/LNS/Winzor/WI00745224-JavaScript_interop_calls_cannot_be_issued_at_this_time

WI00745224 - JavaScript interop calls cannot be issued at this time

Author: Alvarenga1

src/Blazor.Diagrams/Components/DiagramCanvas.razor.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Threading.Tasks;
-using Blazor.Diagrams.Core.Behaviors;
+using Blazor.Diagrams.Core.Behaviors;
 using Blazor.Diagrams.Core.Geometry;
 using Blazor.Diagrams.Extensions;
 using Microsoft.AspNetCore.Components;
@@ -40,6 +38,9 @@ public async ValueTask DisposeAsync()
             await JSRuntime.UnobserveResizes(elementReference);
 
         _reference.Dispose();
+        _reference = null!;
+
+        GC.SuppressFinalize(this); // CA1816
     }
 
     private string GetLayerStyle(int order)

src/Blazor.Diagrams/Extensions/JSRuntimeExtensions.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Threading.Tasks;
-using Blazor.Diagrams.Core.Geometry;
+using Blazor.Diagrams.Core.Geometry;
 using Microsoft.AspNetCore.Components;
 using Microsoft.JSInterop;
 
@@ -28,7 +26,14 @@ public static async Task ObserveResizes<T>(this IJSRuntime jsRuntime, ElementRef
 
     public static async Task UnobserveResizes(this IJSRuntime jsRuntime, ElementReference element)
     {
-        await jsRuntime.InvokeVoidAsync("ZBlazorDiagrams.unobserve", element, element.Id);
+        try
+        {
+            await jsRuntime.InvokeVoidAsync("ZBlazorDiagrams.unobserve", element, element.Id);
+        }
+        catch (JSDisconnectedException)
+        {
+            // Ignore, JSRuntime was already disconnected
+        }
     }
 
     public static async Task AddDefaultPreventingForWheelHandler(this IJSRuntime jsRuntime, ElementReference element)