Use ternary operator and compound assignment.

Author: MaggieKimani1

src/Microsoft.OpenApi.Readers/V2/OpenApiDocumentDeserializer.cs

@@ -59,12 +59,9 @@ internal static partial class OpenApiV2Deserializer
                 "definitions",
                 (o, n) =>
                 {
-                    if (o.Components == null)
-                    {
-                        o.Components = new();
-                    }
-
-                o.Components.Schemas = n.CreateJsonSchemaMapWithReference(ReferenceType.Schema, LoadSchema, OpenApiSpecVersion.OpenApi2_0);                }
+                    o.Components ??= new();
+                    o.Components.Schemas = n.CreateJsonSchemaMapWithReference(ReferenceType.Schema, LoadSchema, OpenApiSpecVersion.OpenApi2_0);
+                }
             },
             {
                 "parameters",

src/Microsoft.OpenApi/Writers/OpenApiWriterBase.cs

@@ -594,15 +594,9 @@ public void WriteJsonSchemaWithoutReference(IOpenApiWriter writer, JsonSchema sc
         /// <inheritdoc />
         public void WriteJsonSchemaReference(IOpenApiWriter writer, Uri referenceUri, OpenApiSpecVersion version)
         {
-            var reference = String.Empty;
-            if (version.Equals(OpenApiSpecVersion.OpenApi2_0))
-            {
-                reference = referenceUri.OriginalString.Replace("components/schemas", "definitions");
-            }
-            else
-            {
-                reference = referenceUri.OriginalString;
-            }
+            var reference = version.Equals(OpenApiSpecVersion.OpenApi2_0)
+                ? referenceUri.OriginalString.Replace("components/schemas", "definitions")
+                : referenceUri.OriginalString;
 
             WriteStartObject();
             this.WriteProperty(OpenApiConstants.DollarRef, reference);