Clean up some MVC code

Author: pranavkm

src/Mvc/Mvc.Core/src/Controllers/ControllerBinderDelegateProvider.cs

@@ -4,7 +4,9 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Linq;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc.Abstractions;
 using Microsoft.AspNetCore.Mvc.ModelBinding;
 
 namespace Microsoft.AspNetCore.Mvc.Controllers
@@ -55,6 +57,9 @@ internal static class ControllerBinderDelegateProvider
                 return null;
             }
 
+            var parameters = actionDescriptor.Parameters as List<ParameterDescriptor> ?? actionDescriptor.Parameters.ToList();
+            var properties = actionDescriptor.BoundProperties as List<ParameterDescriptor> ?? actionDescriptor.BoundProperties.ToList();
+
             return Bind;
 
             async Task Bind(ControllerContext controllerContext, object controller, Dictionary<string, object?> arguments)
@@ -67,9 +72,8 @@ async Task Bind(ControllerContext controllerContext, object controller, Dictiona
 
                 Debug.Assert(valueProvider is not null);
 
-                var parameters = actionDescriptor.Parameters;
-
-                for (var i = 0; i < parameters.Count; i++)
+                var parameterCount = parameters.Count;
+                for (var i = 0; i < parameterCount; i++)
                 {
                     var parameter = parameters[i];
                     var bindingInfo = parameterBindingInfo![i];
@@ -95,8 +99,8 @@ async Task Bind(ControllerContext controllerContext, object controller, Dictiona
                     }
                 }
 
-                var properties = actionDescriptor.BoundProperties;
-                for (var i = 0; i < properties.Count; i++)
+                var propertyCount = properties.Count;
+                for (var i = 0; i < propertyCount; i++)
                 {
                     var property = properties[i];
                     var bindingInfo = propertyBindingInfo![i];

src/Mvc/Mvc.Razor/src/TagHelpers/UrlResolutionTagHelper.cs

@@ -343,15 +343,7 @@ private static string CreateTrimmedString(string input, int start)
 
         private static bool IsCharWhitespace(char ch)
         {
-            for (var i = 0; i < ValidAttributeWhitespaceChars.Length; i++)
-            {
-                if (ValidAttributeWhitespaceChars[i] == ch)
-                {
-                    return true;
-                }
-            }
-            // the character is not white space
-            return false;
+            return ValidAttributeWhitespaceChars.AsSpan().IndexOf(ch) != -1;
         }
 
         private class EncodeFirstSegmentContent : IHtmlContent

src/Mvc/Mvc.TagHelpers/src/AttributeMatcher.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections.Generic;
 using Microsoft.AspNetCore.Razor.TagHelpers;
 
 namespace Microsoft.AspNetCore.Mvc.TagHelpers
@@ -24,7 +23,7 @@ internal static class AttributeMatcher
         /// <returns><c>true</c> if a mode was determined, otherwise <c>false</c>.</returns>
         public static bool TryDetermineMode<TMode>(
             TagHelperContext context,
-            IReadOnlyList<ModeAttributes<TMode>> modeInfos,
+            ModeAttributes<TMode>[] modeInfos,
             Func<TMode, TMode, int> compare,
             out TMode result)
         {
@@ -47,13 +46,11 @@ public static bool TryDetermineMode<TMode>(
             result = default;
 
             // Perf: Avoid allocating enumerator
-            var modeInfosCount = modeInfos.Count;
             var allAttributes = context.AllAttributes;
             // Read interface .Count once rather than per iteration
             var allAttributesCount = allAttributes.Count;
-            for (var i = 0; i < modeInfosCount; i++)
+            foreach (var modeInfo in modeInfos.AsSpan())
             {
-                var modeInfo = modeInfos[i];
                 var requiredAttributes = modeInfo.Attributes;
                 // If there are fewer attributes present than required, one or more of them must be missing.
                 if (allAttributesCount >= requiredAttributes.Length && 

src/Mvc/Mvc.ViewFeatures/src/DefaultDisplayTemplates.cs

@@ -212,7 +212,7 @@ public static IHtmlContent ObjectTemplate(IHtmlHelper htmlHelper)
             var viewBufferScope = serviceProvider.GetRequiredService<IViewBufferScope>();
 
             var content = new HtmlContentBuilder(modelExplorer.Metadata.Properties.Count);
-            foreach (var propertyExplorer in modelExplorer.Properties)
+            foreach (var propertyExplorer in modelExplorer.PropertiesInternal.AsSpan())
             {
                 var propertyMetadata = propertyExplorer.Metadata;
                 if (!ShouldShow(propertyExplorer, templateInfo))

src/Mvc/Mvc.ViewFeatures/src/DefaultEditorTemplates.cs

@@ -255,7 +255,7 @@ public static IHtmlContent ObjectTemplate(IHtmlHelper htmlHelper)
             var viewBufferScope = serviceProvider.GetRequiredService<IViewBufferScope>();
 
             var content = new HtmlContentBuilder(modelExplorer.Metadata.Properties.Count);
-            foreach (var propertyExplorer in modelExplorer.Properties)
+            foreach (var propertyExplorer in modelExplorer.PropertiesInternal.AsSpan())
             {
                 var propertyMetadata = propertyExplorer.Metadata;
                 if (!ShouldShow(propertyExplorer, templateInfo))
@@ -482,6 +482,14 @@ public override void Write(char[] buffer, int index, int count)
                 }
             }
 
+            public override void Write(ReadOnlySpan<char> buffer)
+            {
+                if (!buffer.IsEmpty)
+                {
+                    HasContent = true;
+                }
+            }
+
             public override void Write(string value)
             {
                 if (!string.IsNullOrEmpty(value))
@@ -540,7 +548,7 @@ public override void Encode(TextWriter output, string value, int startIndex, int
                     return;
                 }
 
-                output.Write(value.Substring(startIndex, characterCount));
+                output.Write(value.AsSpan(startIndex, characterCount));
             }
 
             public override unsafe int FindFirstCharacterToEncode(char* text, int textLength)

src/Mvc/Mvc.ViewFeatures/src/ModelExplorer.cs

@@ -199,7 +199,7 @@ public Type ModelType
         /// </remarks>
         public IEnumerable<ModelExplorer> Properties => PropertiesInternal;
 
-        private ModelExplorer[] PropertiesInternal
+        internal ModelExplorer[] PropertiesInternal
         {
             get
             {
@@ -472,4 +472,4 @@ private ModelExplorer CreateExplorerForProperty(
             return new ModelExplorer(_metadataProvider, this, propertyMetadata, modelAccessor);
         }
     }
-}
+}

src/Mvc/Mvc.ViewFeatures/src/ModelExplorerExtensions.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Diagnostics;
 using System.Globalization;
-using System.Linq;
 
 namespace Microsoft.AspNetCore.Mvc.ViewFeatures
 {
@@ -68,12 +67,13 @@ public static string GetSimpleDisplayText(this ModelExplorer modelExplorer)
                 return stringResult;
             }
 
-            var firstProperty = modelExplorer.Properties.FirstOrDefault();
-            if (firstProperty == null)
+            if (modelExplorer.PropertiesInternal.Length == 0)
             {
                 return string.Empty;
             }
 
+            var firstProperty = modelExplorer.PropertiesInternal[0];
+
             if (firstProperty.Model == null)
             {
                 return firstProperty.Metadata.NullDisplayText;
@@ -82,4 +82,4 @@ public static string GetSimpleDisplayText(this ModelExplorer modelExplorer)
             return Convert.ToString(firstProperty.Model, CultureInfo.CurrentCulture);
         }
     }
-}
+}

src/Mvc/MvcNoDeps.slnf

@@ -67,7 +67,7 @@
       "src\\Mvc\\test\\WebSites\\SimpleWebSite\\SimpleWebSite.csproj",
       "src\\Mvc\\test\\WebSites\\TagHelpersWebSite\\TagHelpersWebSite.csproj",
       "src\\Mvc\\test\\WebSites\\VersioningWebSite\\VersioningWebSite.csproj",
-      "src\\Mvc\\test\\WebSites\\XmlFormattersWebSite\\XmlFormattersWebSite.csproj",
+      "src\\Mvc\\test\\WebSites\\XmlFormattersWebSite\\XmlFormattersWebSite.csproj"
     ]
   }
 }

src/Shared/ChunkingCookieManager/ChunkingCookieManager.cs

@@ -70,9 +70,7 @@ private static int ParseChunksCount(string? value)
         {
             if (value != null && value.StartsWith(ChunkCountPrefix, StringComparison.Ordinal))
             {
-                var chunksCountString = value.Substring(ChunkCountPrefix.Length);
-                int chunksCount;
-                if (int.TryParse(chunksCountString, NumberStyles.None, CultureInfo.InvariantCulture, out chunksCount))
+                if (int.TryParse(value.AsSpan(ChunkCountPrefix.Length), NumberStyles.None, CultureInfo.InvariantCulture, out var chunksCount))
                 {
                     return chunksCount;
                 }