diff --git a/Directory.Build.props b/Directory.Build.props
index 8e1db1d2f2..17352d6f83 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -96,11 +96,9 @@
       [CA1720] Identifier 'xxx' contains type name
       [CA1725] Overriden parameter name mismatch
       [CA1805] Member is explicitly initialized to its default value
-      [CA1827] Count() is used where Any() could be used instead to improve performance
       [CA1834] Use 'StringBuilder.Append(char)' instead of 'StringBuilder.Append(string)' when the input is a constant unit string
       [CA1845] Use span-based 'string.Concat' and 'AsSpan' instead of 'Substring'
       [CA1847] Use 'string.Contains(char)' instead of 'string.Contains(string)' - needs polyfill
-      [CA1854] Prefer a 'TryGetValue' call over a Dictionary indexer access
       [CA1861] Prefer 'static readonly' fields over constant array arguments
       [CA1862] Prefer using 'string.Equals(string, StringComparison)' to perform a case-insensitive comparison
       [CA1865] Use 'string.StartsWith(char)' instead of 'string.StartsWith(string)'  - needs polyfill
@@ -112,7 +110,7 @@
       [SYSLIB0012] 'Assembly.CodeBase' is obsolete
     -->
     <NoWarn>$(NoWarn);IDE0005;IDE0008;IDE0011;IDE0017;IDE0019;IDE0021;IDE0022;IDE0025;IDE0027;IDE0028;IDE0029;IDE0032;IDE0039;IDE0045;IDE0046;IDE0055;IDE0056;IDE0057;IDE0059;IDE0060;IDE0061;IDE0063;IDE0074;IDE0078;IDE0083;IDE0090;IDE0130;IDE0160;IDE0200;IDE0260;IDE0270;IDE0290;IDE0300;IDE0305;IDE0301;IDE0330</NoWarn>
-    <NoWarn>$(NoWarn);CA1200;CA1304;CA1305;CA1310;CA1311;CA1507;CA1510;CA1514;CA1710;CA1716;CA1720;CA1725;CA1805;CA1827;CA1834;CA1845;CA1847;CA1854;CA1861;CA1862;CA1865;CA1866;CA1870;CA2249;CA2263;SYSLIB0012</NoWarn>
+    <NoWarn>$(NoWarn);CA1200;CA1304;CA1305;CA1310;CA1311;CA1507;CA1510;CA1514;CA1710;CA1716;CA1720;CA1725;CA1805;CA1834;CA1845;CA1847;CA1861;CA1862;CA1865;CA1866;CA1870;CA2249;CA2263;SYSLIB0012</NoWarn>
   </PropertyGroup>
 
 </Project>
diff --git a/src/NSwag.CodeGeneration.CSharp/CSharpControllerGenerator.cs b/src/NSwag.CodeGeneration.CSharp/CSharpControllerGenerator.cs
index d41a7d9fd7..8d965ca59e 100644
--- a/src/NSwag.CodeGeneration.CSharp/CSharpControllerGenerator.cs
+++ b/src/NSwag.CodeGeneration.CSharp/CSharpControllerGenerator.cs
@@ -51,7 +51,7 @@ protected override IEnumerable<CodeArtifact> GenerateAllClientTypes()
             var artifacts = base.GenerateAllClientTypes().ToList();
 
             if (Settings.ControllerTarget == CSharpControllerTarget.AspNet &&
-                _document.Operations.Count(operation => operation.Operation.ActualParameters.Any(p => p.Kind == OpenApiParameterKind.Header)) > 0)
+                _document.Operations.Any(operation => operation.Operation.ActualParameters.Any(p => p.Kind == OpenApiParameterKind.Header)))
             {
                 var template = Settings.CodeGeneratorSettings.TemplateFactory.CreateTemplate("CSharp", "Controller.AspNet.FromHeaderAttribute", new object());
                 artifacts.Add(new CodeArtifact("FromHeaderAttribute", CodeArtifactType.Class, CodeArtifactLanguage.CSharp, CodeArtifactCategory.Utility, template));
diff --git a/src/NSwag.CodeGeneration.CSharp/CSharpGeneratorBase.cs b/src/NSwag.CodeGeneration.CSharp/CSharpGeneratorBase.cs
index 6fe56d6a5a..0d2f6cf905 100644
--- a/src/NSwag.CodeGeneration.CSharp/CSharpGeneratorBase.cs
+++ b/src/NSwag.CodeGeneration.CSharp/CSharpGeneratorBase.cs
@@ -74,7 +74,7 @@ public override string GetBinaryResponseTypeName()
         /// <param name="document">The document </param>
         public static CSharpTypeResolver CreateResolverWithExceptionSchema(CSharpGeneratorSettings settings, OpenApiDocument document)
         {
-            var exceptionSchema = document.Definitions.ContainsKey("Exception") ? document.Definitions["Exception"] : null;
+            var exceptionSchema = document.Definitions.TryGetValue("Exception", out JsonSchema value) ? value : null;
 
             var resolver = new CSharpTypeResolver(settings, exceptionSchema);
             resolver.RegisterSchemaDefinitions(document.Definitions
diff --git a/src/NSwag.CodeGeneration.TypeScript/Models/TypeScriptFileTemplateModel.cs b/src/NSwag.CodeGeneration.TypeScript/Models/TypeScriptFileTemplateModel.cs
index 06927a870e..24285d90c5 100644
--- a/src/NSwag.CodeGeneration.TypeScript/Models/TypeScriptFileTemplateModel.cs
+++ b/src/NSwag.CodeGeneration.TypeScript/Models/TypeScriptFileTemplateModel.cs
@@ -104,9 +104,9 @@ public IEnumerable<string> ResponseClassNames
         public string ExtensionCodeImport => _extensionCode.ImportCode;
 
         /// <summary>Gets or sets the extension code to insert at the beginning.</summary>
-        public string ExtensionCodeTop => _settings.ConfigurationClass != null && _extensionCode.ExtensionClasses.ContainsKey(_settings.ConfigurationClass) ?
-            _extensionCode.ExtensionClasses[_settings.ConfigurationClass] + "\n\n" + _extensionCode.TopCode :
-            _extensionCode.TopCode;
+        public string ExtensionCodeTop => _settings.ConfigurationClass != null && _extensionCode.ExtensionClasses.TryGetValue(_settings.ConfigurationClass, out string value)
+            ? value + "\n\n" + _extensionCode.TopCode
+            : _extensionCode.TopCode;
 
         /// <summary>Gets or sets the extension code to insert at the end.</summary>
         public string ExtensionCodeBottom { get; }
diff --git a/src/NSwag.CodeGeneration.TypeScript/Models/TypeScriptOperationModel.cs b/src/NSwag.CodeGeneration.TypeScript/Models/TypeScriptOperationModel.cs
index 4469e4cc09..02fcac12e6 100644
--- a/src/NSwag.CodeGeneration.TypeScript/Models/TypeScriptOperationModel.cs
+++ b/src/NSwag.CodeGeneration.TypeScript/Models/TypeScriptOperationModel.cs
@@ -123,7 +123,7 @@ public override string ExceptionType
         {
             get
             {
-                if (_operation.ActualResponses.Count(r => !HttpUtilities.IsSuccessStatusCode(r.Key)) == 0)
+                if (_operation.ActualResponses.All(r => HttpUtilities.IsSuccessStatusCode(r.Key)))
                 {
                     return "string";
                 }
diff --git a/src/NSwag.Generation.AspNetCore/Processors/OperationParameterProcessor.cs b/src/NSwag.Generation.AspNetCore/Processors/OperationParameterProcessor.cs
index e96ac0de78..3049c67098 100644
--- a/src/NSwag.Generation.AspNetCore/Processors/OperationParameterProcessor.cs
+++ b/src/NSwag.Generation.AspNetCore/Processors/OperationParameterProcessor.cs
@@ -329,20 +329,21 @@ private static JsonSchema CreateOrGetFormDataSchema(OperationProcessorContext co
             }
 
             var requestBody = context.OperationDescription.Operation.RequestBody;
-            if (!requestBody.Content.ContainsKey(MultipartFormData))
+            if (!requestBody.Content.TryGetValue(MultipartFormData, out OpenApiMediaType value))
             {
-                requestBody.Content[MultipartFormData] = new OpenApiMediaType
+                value = new OpenApiMediaType
                 {
                     Schema = new JsonSchema()
                 };
+                requestBody.Content[MultipartFormData] = value;
             }
 
-            if (requestBody.Content[MultipartFormData].Schema == null)
+            if (value.Schema == null)
             {
-                requestBody.Content[MultipartFormData].Schema = new JsonSchema();
+                value.Schema = new JsonSchema();
             }
 
-            return requestBody.Content[MultipartFormData].Schema;
+            return value.Schema;
         }
 
         private static JsonSchemaProperty CreateFormDataProperty(OperationProcessorContext context, ExtendedApiParameterDescription extendedApiParameter, JsonSchema schema)
diff --git a/src/NSwag.Generation.WebApi/WebApiOpenApiDocumentGenerator.cs b/src/NSwag.Generation.WebApi/WebApiOpenApiDocumentGenerator.cs
index ee2f0b47a3..ec94c92147 100644
--- a/src/NSwag.Generation.WebApi/WebApiOpenApiDocumentGenerator.cs
+++ b/src/NSwag.Generation.WebApi/WebApiOpenApiDocumentGenerator.cs
@@ -216,18 +216,19 @@ private bool AddOperationDescriptionsToDocument(OpenApiDocument document, Type c
                 {
                     var path = operation.Path.Replace("//", "/");
 
-                    if (!document.Paths.ContainsKey(path))
+                    if (!document.Paths.TryGetValue(path, out OpenApiPathItem value))
                     {
-                        document.Paths[path] = new OpenApiPathItem();
+                        value = new OpenApiPathItem();
+                        document.Paths[path] = value;
                     }
 
-                    if (document.Paths[path].ContainsKey(operation.Method))
+                    if (value.ContainsKey(operation.Method))
                     {
                         throw new InvalidOperationException("The method '" + operation.Method + "' on path '" + path + "' is registered multiple times " +
                             "(check the DefaultUrlTemplate setting [default for Web API: 'api/{controller}/{id}'; for MVC projects: '{controller}/{action}/{id?}']).");
                     }
 
-                    document.Paths[path][operation.Method] = operation.Operation;
+                    value[operation.Method] = operation.Operation;
                     addedOperations++;
                 }
             }