From 3e64f2014e7cd1293a375c2ee3d0c1652ff522c4 Mon Sep 17 00:00:00 2001
From: Eric Erhardt <eric.erhardt@microsoft.com>
Date: Thu, 1 Apr 2021 16:36:14 -0500
Subject: [PATCH 1/2] Change Router _emptyParametersDictionary to a regular
 Dictionary

This allows for ReadOnlyDictionary to be trimmed in a default Blazor WASM app. Saving roughly 3 KB .br compressed.

Contributes to #30098
---
 src/Components/Components/src/Routing/Router.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Components/Components/src/Routing/Router.cs b/src/Components/Components/src/Routing/Router.cs
index d2dc133ff1ea..d8bad189e558 100644
--- a/src/Components/Components/src/Routing/Router.cs
+++ b/src/Components/Components/src/Routing/Router.cs
@@ -23,8 +23,8 @@ namespace Microsoft.AspNetCore.Components.Routing
     public class Router : IComponent, IHandleAfterRender, IDisposable
     {
         static readonly char[] _queryOrHashStartChar = new[] { '?', '#' };
-        static readonly ReadOnlyDictionary<string, object> _emptyParametersDictionary
-            = new ReadOnlyDictionary<string, object>(new Dictionary<string, object>());
+        static readonly IReadOnlyDictionary<string, object> _emptyParametersDictionary
+            = new Dictionary<string, object>();
 
         RenderHandle _renderHandle;
         string _baseUri;

From 0cc98e0ddcfaf5f3c35bf0038d3f5a94265a8d45 Mon Sep 17 00:00:00 2001
From: James Newton-King <james@newtonking.com>
Date: Sat, 3 Apr 2021 16:59:10 +1300
Subject: [PATCH 2/2] Update src/Components/Components/src/Routing/Router.cs

---
 src/Components/Components/src/Routing/Router.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Components/Components/src/Routing/Router.cs b/src/Components/Components/src/Routing/Router.cs
index d8bad189e558..ff8cd2483161 100644
--- a/src/Components/Components/src/Routing/Router.cs
+++ b/src/Components/Components/src/Routing/Router.cs
@@ -23,6 +23,7 @@ namespace Microsoft.AspNetCore.Components.Routing
     public class Router : IComponent, IHandleAfterRender, IDisposable
     {
         static readonly char[] _queryOrHashStartChar = new[] { '?', '#' };
+        // Dictionary is intentionally used instead of ReadOnlyDictionary to reduce Blazor size
         static readonly IReadOnlyDictionary<string, object> _emptyParametersDictionary
             = new Dictionary<string, object>();