doc(Router): compatible with NET10 (#7054)

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Routes.razor

@@ -1,6 +1,26 @@
-<Router AppAssembly="@typeof(Program).Assembly" NotFoundPage="typeof(Pages.NotFound)">
-    <Found Context="routeData">
-        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
-        <FocusOnNavigate RouteData="routeData" Selector="h3" />
-    </Found>
-</Router>
+@if (IsNet10OrGreater)
+{
+    <Router AppAssembly="@typeof(Program).Assembly" NotFoundPage="typeof(Pages.NotFound)">
+        <Found Context="routeData">
+            <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+            <FocusOnNavigate RouteData="routeData" Selector="h3" />
+        </Found>
+    </Router>
+}
+else
+{
+    <Router AppAssembly="@typeof(Program).Assembly">
+        <Found Context="routeData">
+            <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+            <FocusOnNavigate RouteData="routeData" Selector="h3" />
+        </Found>
+    </Router>
+}
+
+@code {
+    #if NET10_0_OR_GREATER
+    private bool IsNet10OrGreater => true;
+    #else
+    private bool IsNet10OrGreater => false;
+    #endif
+}