Merge pull request #37 from AppCoreNet/dev

Release 0.4.4

Author: prochnowc

src/AppCore.Diagnostics.Sources/contentFiles/cs/any/Internal/Diagnostics/MaybeNullWhenAttribute.cs

@@ -0,0 +1,20 @@
+// Licensed under the MIT License.
+// Copyright (c) 2022 the AppCore .NET project.
+
+#if !NETCOREAPP3_0_OR_GREATER && !NETSTANDARD2_1 && ENABLE_NULLABLE
+
+namespace System.Diagnostics.CodeAnalysis
+{
+    [AttributeUsage(AttributeTargets.Parameter)]
+    public class MaybeNullWhenAttribute : Attribute
+    {
+        public bool ReturnValue { get; }
+
+        public MaybeNullWhenAttribute(bool returnValue)
+        {
+            ReturnValue = returnValue;
+        }
+    }
+}
+
+#endif