Improve query passing.

Author: ilonatommy

src/Components/test/testassets/Components.WasmMinimal/Routes.razor

@@ -4,15 +4,15 @@
 @inject NavigationManager NavigationManager
 
 @code {
+    [Parameter]
+    [SupplyParameterFromQuery(Name = "useCustomNotFoundPage")]
+    public string? UseCustomNotFoundPage { get; set; }
+
     private Type? NotFoundPageType { get; set; }
 
-    protected override void OnInitialized()
+    protected override void OnParametersSet()
     {
-        var uri = NavigationManager.ToAbsoluteUri(NavigationManager.Uri);
-        var query = System.Web.HttpUtility.ParseQueryString(uri.Query);
-        var useCustomNotFoundPage = query["useCustomNotFoundPage"];
-
-        if (useCustomNotFoundPage == "true")
+        if (UseCustomNotFoundPage == "true")
         {
             NotFoundPageType = typeof(CustomNotFoundPage);
         }