Fix usage of JSInterop

Author: SQL-MisterMagoo

BlazorComponentSample/Component1.cshtml

@@ -1,5 +1,7 @@
 @using Microsoft.AspNetCore.Components
 @inherits ComponentBase
+@using Microsoft.JSInterop
+@inject IJSRuntime jSRuntime
 <div class="my-component">
     This Blazor component is defined in the <strong>BlazorComponentSample</strong> package.
 </div>
@@ -10,6 +12,6 @@
 {
   Task OnClick(UIMouseEventArgs args)
   {
-      return ExampleJsInterop.Prompt("you clicked me");
+      return ExampleJsInterop.Prompt(jSRuntime,"you clicked me");
   }
 }

BlazorComponentSample/ExampleJsInterop.cs

@@ -1,14 +1,15 @@
+using Microsoft.AspNetCore.Components;
 using Microsoft.JSInterop;
 using System.Threading.Tasks;
 
 namespace BlazorComponentSample
 {
     public class ExampleJsInterop
     {
-        public static Task<string> Prompt(string message)
+        public static Task<string> Prompt(IJSRuntime jSRuntime, string message)
         {
             // Implemented in exampleJsInterop.js
-            return JSRuntime.Current.InvokeAsync<string>(
+            return jSRuntime.InvokeAsync<string>(
                 "exampleJsFunctions.showPrompt",
                 message);
         }