Fixed Router renders component twice (#47880)

* fix Router renders component twice

Author: surayya-MS

src/Components/Components/src/Routing/Router.cs

@@ -136,8 +136,10 @@ public async Task SetParametersAsync(ParameterView parameters)
             _onNavigateCalled = true;
             await RunOnNavigateAsync(NavigationManager.ToBaseRelativePath(_locationAbsolute), isNavigationIntercepted: false);
         }
-
-        Refresh(isNavigationIntercepted: false);
+        else
+        {
+            Refresh(isNavigationIntercepted: false);
+        }
     }
 
     /// <inheritdoc />

src/Components/Components/test/Routing/RouterTest.cs

@@ -199,6 +199,31 @@ await _renderer.Dispatcher.InvokeAsync(() =>
         Assert.Equal($"Rendering route matching {typeof(MultiSegmentRouteComponent)}", renderedFrame.TextContent);
     }
 
+    [Fact]
+    public async Task SetParametersAsyncRefreshesOnce()
+    {
+        //Arrange
+        var parameters = new Dictionary<string, object>
+            {
+                { nameof(Router.AppAssembly), typeof(RouterTest).Assembly },
+                { nameof(Router.NotFound), (RenderFragment)(builder => { }) },
+            };
+
+        var refreshCalled = 0;
+        _renderer.OnUpdateDisplay = (renderBatch) =>
+        {
+            refreshCalled += 1;
+            return;
+        };
+
+        // Act
+        await _renderer.Dispatcher.InvokeAsync(() =>
+            _router.SetParametersAsync(ParameterView.FromDictionary(parameters)));
+
+        //Assert
+        Assert.Equal(1, refreshCalled);
+    }
+
     internal class TestNavigationManager : NavigationManager
     {
         public TestNavigationManager() =>