Renamed OnlySupportedInNetstandard21 to NotSupportedInNetstandard20 and also use !NETSTANDARD2_0 as a check for the define.

Author: dlemstra

tools/Magick.NET.SourceGenerator/Helpers/MethodInfo.cs

@@ -52,9 +52,9 @@ public bool IsVoid
 
     public bool IsStatic { get; }
 
-    public bool OnlySupportedInNetstandard21
-        => ReturnType.OnlySupportedInNetstandard21 ||
-           Parameters.Any(parameter => parameter.Type.OnlySupportedInNetstandard21);
+    public bool NotSupportedInNetstandard20
+        => ReturnType.NotSupportedInNetstandard20 ||
+           Parameters.Any(parameter => parameter.Type.NotSupportedInNetstandard20);
 
     public string Name
         => _method.Identifier.Text;

tools/Magick.NET.SourceGenerator/Helpers/TypeInfo.cs

@@ -70,7 +70,7 @@ public bool IsFixed
             _ => false,
         };
 
-    public bool OnlySupportedInNetstandard21
+    public bool NotSupportedInNetstandard20
         => Name switch
         {
             "ReadOnlySpan<byte>" => true,

tools/Magick.NET.SourceGenerator/NativeInterop/NativeInteropGenerator.cs

@@ -126,8 +126,8 @@ private static void AppendNativeInterop(CodeBuilder codeBuilder, NativeInteropIn
         {
             var useInstance = info.HasInstance && method.UsesInstance;
 
-            if (method.OnlySupportedInNetstandard21)
-                codeBuilder.AppendLine("#if NETSTANDARD2_1");
+            if (method.NotSupportedInNetstandard20)
+                codeBuilder.AppendLine("#if !NETSTANDARD2_0");
 
             codeBuilder.Append("[DllImport(NativeLibrary.");
             codeBuilder.Append(name);
@@ -173,7 +173,7 @@ private static void AppendNativeInterop(CodeBuilder codeBuilder, NativeInteropIn
             codeBuilder.Append(")");
             codeBuilder.AppendLine(";");
 
-            if (method.OnlySupportedInNetstandard21)
+            if (method.NotSupportedInNetstandard20)
                 codeBuilder.AppendLine("#endif");
         }
 
@@ -269,8 +269,8 @@ private static void AppendNativeClassInstanceMethods(CodeBuilder codeBuilder, Na
     private static void AppendNativeMethod(CodeBuilder codeBuilder, NativeInteropInfo info, MethodInfo method)
     {
         codeBuilder.AppendLine();
-        if (method.OnlySupportedInNetstandard21)
-            codeBuilder.AppendLine("#if NETSTANDARD2_1");
+        if (method.NotSupportedInNetstandard20)
+            codeBuilder.AppendLine("#if !NETSTANDARD2_0");
 
         codeBuilder.Append("public ");
         if (method.IsStatic)
@@ -471,7 +471,7 @@ private static void AppendNativeMethod(CodeBuilder codeBuilder, NativeInteropInf
 
         codeBuilder.AppendCloseBrace();
 
-        if (method.OnlySupportedInNetstandard21)
+        if (method.NotSupportedInNetstandard20)
             codeBuilder.AppendLine("#endif");
     }