Update SDK

.editorconfig

@@ -147,7 +147,7 @@ dotnet_diagnostic.CA1840.severity = warning
 dotnet_diagnostic.CA1841.severity = warning
 
 # CA1845: Use span-based 'string.Concat'
-dotnet_diagnostic.CA1845.severity = warning
+dotnet_diagnostic.CA1845.severity = suggestion
 
 # CA1846: Prefer AsSpan over Substring
 dotnet_diagnostic.CA1846.severity = warning
@@ -186,5 +186,10 @@ dotnet_diagnostic.CA1837.severity = suggestion
 dotnet_diagnostic.CA1838.severity = suggestion
 # CA1841: Prefer Dictionary.Contains methods
 dotnet_diagnostic.CA1841.severity = suggestion
+# CA1845: Use span-based 'string.Concat'
+dotnet_diagnostic.CA1845.severity = suggestion
+# CA1846: Prefer AsSpan over Substring
+dotnet_diagnostic.CA1846.severity = suggestion
 # CA2012: Use ValueTask correctly
 dotnet_diagnostic.CA2012.severity = suggestion
+

global.json

@@ -1,9 +1,9 @@
 {
   "sdk": {
-    "version": "6.0.100-preview.5.21264.3"
+    "version": "6.0.100-preview.6.21308.9"
   },
   "tools": {
-    "dotnet": "6.0.100-preview.5.21264.3",
+    "dotnet": "6.0.100-preview.6.21308.9",
     "runtimes": {
       "dotnet/x64": [
         "2.1.27",

src/Components/WebView/WebView/src/QueryString.cs

@@ -193,7 +193,7 @@ public QueryString Add(QueryString other)
             }
 
             // ?name1=value1 Add ?name2=value2 returns ?name1=value1&name2=value2
-            return new QueryString(Value + "&" + other.Value.Substring(1));
+            return new QueryString(string.Concat(Value, "&", other.Value.AsSpan(1)));
         }
 
         /// <summary>

src/Hosting/test/testassets/BasicLinkedApp/BasicLinkedApp.csproj

@@ -6,6 +6,8 @@
     <PublishTrimmed>true</PublishTrimmed>
     <TrimMode>link</TrimMode>
     <ILLinkTreatWarningsAsErrors>false</ILLinkTreatWarningsAsErrors>
+    <!-- Revert after issue in https://github.com/dotnet/aspnetcore/pull/33187 is resolved. -->
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
   </PropertyGroup>
 
   <ItemGroup>

src/Http/Http.Abstractions/src/QueryString.cs

@@ -187,7 +187,7 @@ public QueryString Add(QueryString other)
             }
 
             // ?name1=value1 Add ?name2=value2 returns ?name1=value1&name2=value2
-            return new QueryString(Value + "&" + other.Value.Substring(1));
+            return new QueryString(string.Concat(Value, "&", other.Value.AsSpan(1)));
         }
 
         /// <summary>

src/Http/Http.Abstractions/test/MapPathMiddlewareTests.cs

@@ -89,7 +89,7 @@ public async Task PathMatchAction_BranchTaken(string matchPath, string basePath,
             await app.Invoke(context);
 
             Assert.Equal(200, context.Response.StatusCode);
-            Assert.Equal(basePath + requestPath.Substring(0, matchPath.Length), (string)context.Items["test.PathBase"]!);
+            Assert.Equal(string.Concat(basePath, requestPath.AsSpan(0, matchPath.Length)), (string)context.Items["test.PathBase"]!);
             Assert.Equal(requestPath.Substring(matchPath.Length), context.Items["test.Path"]);
         }
 

src/Http/Routing/src/Patterns/RoutePatternParser.cs

@@ -568,7 +568,7 @@ private string DebuggerToString()
                 }
                 else
                 {
-                    return _template.Substring(0, _index) + "|" + _template.Substring(_index);
+                    return string.Concat(_template.Substring(0, _index), "|", _template.Substring(_index));
                 }
             }
         }

src/Identity/test/InMemory.Test/FunctionalTest.cs

@@ -332,7 +332,7 @@ private static async Task<TestServer> CreateServer(Action<IServiceCollection> co
                             }
                             else if (req.Path.StartsWithSegments(new PathString("/pwdLogin"), out remainder))
                             {
-                                var isPersistent = bool.Parse(remainder.Value.Substring(1));
+                                var isPersistent = bool.Parse(remainder.Value.AsSpan(1));
                                 var result = await signInManager.PasswordSignInAsync("hao", TestPassword, isPersistent, false);
                                 res.StatusCode = result.Succeeded ? 200 : 500;
                             }

src/Logging.AzureAppServices/src/BlobAppendReferenceWrapper.cs

@@ -89,7 +89,11 @@ private static void AppendBlockQuery(UriBuilder uriBuilder)
             // and set the property with the combined string.
             var queryToAppend = "comp=appendblock";
             if (uriBuilder.Query != null && uriBuilder.Query.Length > 1)
+#if NETFRAMEWORK || NETSTANDARD
                 uriBuilder.Query = uriBuilder.Query.Substring(1) + "&" + queryToAppend;
+#else
+                uriBuilder.Query = string.Concat(uriBuilder.Query.AsSpan(1), "&", queryToAppend);
+#endif
             else
                 uriBuilder.Query = queryToAppend;
         }

src/Middleware/ResponseCompression/src/ResponseCompressionProvider.cs

@@ -258,7 +258,7 @@ public bool CheckRequestAcceptsCompression(HttpContext context)
 
             if (slashPos >= 0)
             {
-                var partialMimeType = mimeType!.Substring(0, slashPos.Value) + "/*";
+                var partialMimeType = string.Concat(mimeType!.AsSpan(0, slashPos.Value), "/*");
                 return ShouldCompressExact(partialMimeType);
             }
 

src/Middleware/tools/RazorPageGenerator/Program.cs

@@ -218,7 +218,7 @@ private string ProcessFileIncludes()
                     var includeFileName = cshtmlContent.Substring(startIndex + startMatch.Length, endIndex - (startIndex + startMatch.Length));
                     Console.WriteLine("      Inlining file {0}", includeFileName);
                     var includeFileContent = File.ReadAllText(System.IO.Path.Combine(basePath, includeFileName));
-                    cshtmlContent = cshtmlContent.Substring(0, startIndex) + includeFileContent + cshtmlContent.Substring(endIndex + endMatch.Length);
+                    cshtmlContent = string.Concat(cshtmlContent.AsSpan(0, startIndex), includeFileContent, cshtmlContent.AsSpan(endIndex + endMatch.Length));
                     startIndex = startIndex + includeFileContent.Length;
                 }
                 return cshtmlContent;

src/Mvc/Mvc.Core/src/Routing/ViewEnginePath.cs

@@ -40,7 +40,7 @@ public static string CombinePath(string first, string second)
             }
             else
             {
-                result = first.Substring(0, index + 1) + second;
+                result = string.Concat(first.AsSpan(0, index + 1), second);
             }
 
             return ResolvePath(result);

src/Mvc/Mvc.Razor.RuntimeCompilation/src/FileProviderRazorProjectFileSystem.cs

@@ -86,7 +86,7 @@ private static string JoinPath(string path1, string path2)
             var hasLeadingSlash = path2.StartsWith("/", StringComparison.Ordinal);
             if (hasLeadingSlash && hasTrailingSlash)
             {
-                return path1 + path2.Substring(1);
+                return string.Concat(path1, path2.AsSpan(1));
             }
             else if (hasLeadingSlash || hasTrailingSlash)
             {

src/Mvc/Mvc.RazorPages/src/DependencyInjection/RazorPagesRazorViewEngineOptionsSetup.cs

@@ -72,7 +72,7 @@ private static string CombinePath(string path1, string path2)
             }
             else if (path1.EndsWith("/", StringComparison.Ordinal) && path2.StartsWith("/", StringComparison.Ordinal))
             {
-                return path1 + path2.Substring(1);
+                return string.Concat(path1, path2.AsSpan(1));
             }
 
             return path1 + "/" + path2;

src/Security/samples/CustomPolicyProvider/Authorization/MinimumAgeAuthorizeAttribute.cs

@@ -1,3 +1,4 @@
+using System;
 using Microsoft.AspNetCore.Authorization;
 
 namespace CustomPolicyProvider
@@ -20,7 +21,7 @@ public int Age
         {
             get
             {
-                if (int.TryParse(Policy.Substring(POLICY_PREFIX.Length), out var age))
+                if (int.TryParse(Policy.AsSpan(POLICY_PREFIX.Length), out var age))
                 {
                     return age;
                 }

src/Servers/Kestrel/samples/LargeResponseApp/Startup.cs

@@ -1,6 +1,7 @@
 // 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;
 using System.IO;
 using System.Net;
 using System.Text;
@@ -22,7 +23,7 @@ public void Configure(IApplicationBuilder app)
             app.Run(async (context) =>
             {
                 var path = context.Request.Path;
-                if (!path.HasValue || !int.TryParse(path.Value.Substring(1), out var numChunks))
+                if (!path.HasValue || !int.TryParse(path.Value.AsSpan(1), out var numChunks))
                 {
                     numChunks = _defaultNumChunks;
                 }
@@ -49,7 +50,7 @@ public static Task Main(string[] args)
                         })
                         .UseContentRoot(Directory.GetCurrentDirectory())
                         .UseStartup<Startup>();
-                })                
+                })
                 .Build();
 
             return host.RunAsync();

src/Shared/CommandLineUtils/CommandLine/AnsiConsole.cs

@@ -92,7 +92,11 @@ public void WriteLine(string message)
                     {
                         case 'm':
                             int value;
+#if NETFRAMEWORK
                             if (int.TryParse(message.Substring(startIndex, endIndex - startIndex), out value))
+#else
+                            if (int.TryParse(message.AsSpan(startIndex, endIndex - startIndex), out value))
+#endif
                             {
                                 switch (value)
                                 {

src/Testing/src/AssemblyTestLog.cs

@@ -131,7 +131,7 @@ public IServiceProvider CreateLoggerServices(ITestOutputHelper output, string cl
                         throw new InvalidOperationException("Output file path could not be constructed due to max path length restrictions. Please shorten test assembly, class or method names.");
                     }
 
-                    testName = testName.Substring(0, testNameLength / 2) + testName.Substring(testName.Length - testNameLength / 2, testNameLength / 2);
+                    testName = string.Concat(testName.AsSpan(0, testNameLength / 2).ToString(), testName.AsSpan(testName.Length - testNameLength / 2, testNameLength / 2).ToString());
 
                     _globalLogger.LogWarning($"To prevent long paths test name was shortened to {testName}.");
                 }

src/WebEncoders/src/Testing/HtmlTestEncoder.cs

@@ -76,7 +76,11 @@ public override void Encode(TextWriter output, string value, int startIndex, int
             }
 
             output.Write("HtmlEncode[[");
+#if NETFRAMEWORK || NETSTANDARD
             output.Write(value.Substring(startIndex, characterCount));
+#else
+            output.Write(value.AsSpan(startIndex, characterCount));
+#endif
             output.Write("]]");
         }
 

src/WebEncoders/src/Testing/JavaScriptTestEncoder.cs

@@ -76,7 +76,11 @@ public override void Encode(TextWriter output, string value, int startIndex, int
             }
 
             output.Write("JavaScriptEncode[[");
+#if NETFRAMEWORK || NETSTANDARD
             output.Write(value.Substring(startIndex, characterCount));
+#else
+            output.Write(value.AsSpan(startIndex, characterCount));
+#endif
             output.Write("]]");
         }
 

src/WebEncoders/src/Testing/UrlTestEncoder.cs

@@ -76,7 +76,11 @@ public override void Encode(TextWriter output, string value, int startIndex, int
             }
 
             output.Write("UrlEncode[[");
+#if NETFRAMEWORK || NETSTANDARD
             output.Write(value.Substring(startIndex, characterCount));
+#else
+            output.Write(value.AsSpan(startIndex, characterCount));
+#endif
             output.Write("]]");
         }