Fix negative route params. Fixes #1437

src/Microsoft.AspNetCore.Blazor/Routing/RouteConstraint.cs

-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
@@ -62,10 +62,10 @@ namespace Microsoft.AspNetCore.Blazor.Routing
                     return new TypeRouteConstraint<Guid>(Guid.TryParse);
                 case "int":
                     return new TypeRouteConstraint<int>((string str, out int result)
-                        => int.TryParse(str, NumberStyles.None, CultureInfo.InvariantCulture, out result));
+                        => int.TryParse(str, NumberStyles.Integer, CultureInfo.InvariantCulture, out result));
                 case "long":
                     return new TypeRouteConstraint<long>((string str, out long result)
-                        => long.TryParse(str, NumberStyles.None, CultureInfo.InvariantCulture, out result));
+                        => long.TryParse(str, NumberStyles.Integer, CultureInfo.InvariantCulture, out result));
                 default:
                     return null;
             }

test/Microsoft.AspNetCore.Blazor.E2ETest/Tests/RoutingTest.cs

@@ -61,6 +61,23 @@ namespace Microsoft.AspNetCore.Blazor.E2ETest.Tests
             AssertHighlightedLinks();
         }
 
+        [Fact]
+        public void CanArriveAtPageWithNumberParameters()
+        {
+            var testInt = int.MinValue;
+            var testLong = long.MinValue;
+            var testDec = -2.33333m;
+            var testDouble = -1.489d;
+            var testFloat = -2.666f;
+
+            SetUrlViaPushState($"/WithNumberParameters/{testInt}/{testLong}/{testDouble}/{testFloat}/{testDec}");
+
+            var app = MountTestComponent<TestRouter>();
+            var expected = $"Test parameters: {testInt} {testLong} {testDouble} {testFloat} {testDec}";
+
+            Assert.Equal(expected, app.FindElement(By.Id("test-info")).Text);
+        }
+
         [Fact]
         public void CanArriveAtNonDefaultPage()
         {

test/Microsoft.AspNetCore.Blazor.Test/Routing/RouteTableTests.cs

@@ -167,7 +167,9 @@ namespace Microsoft.AspNetCore.Blazor.Test.Routing
             new object[] { "/{value:float}", "/0.1", 0.1f },
             new object[] { "/{value:guid}", "/1FCEF085-884F-416E-B0A1-71B15F3E206B", Guid.Parse("1FCEF085-884F-416E-B0A1-71B15F3E206B") },
             new object[] { "/{value:int}", "/123", 123 },
+            new object[] { "/{value:int}", "/-123", -123},
             new object[] { "/{value:long}", "/9223372036854775807", long.MaxValue },
+            new object[] { "/{value:long}", $"/-9223372036854775808", long.MinValue },
         };
 
         [Theory]

test/testapps/BasicTestApp/RouterTest/WithNumberParameters.cshtml

+@page "/WithNumberParameters/{TestInt:int}/{TestLong:long}/{TestDouble:double}/{TestFloat:float}/{TestDec:decimal}"
+<div id="test-info">Test parameters: @TestInt @TestLong @TestDouble @TestFloat @TestDec</div>
+
+@functions
+{
+    [Parameter] int TestInt { get; set; }
+    [Parameter] long TestLong { get; set; }
+    [Parameter] double TestDouble { get; set; }
+    [Parameter] float TestFloat { get; set; }
+    [Parameter] decimal TestDec { get; set; }
+}