Annotate unsupported APIs in .Net core as Obsolete - Reflection area

src/libraries/System.Private.CoreLib/src/System/Reflection/Assembly.cs

@@ -372,10 +372,13 @@ public static Assembly LoadFrom(string assemblyFile, byte[]? hashValue, Assembly
         [RequiresUnreferencedCode("Types and members the loaded module depends on might be removed")]
         public virtual Module LoadModule(string moduleName, byte[]? rawModule, byte[]? rawSymbolStore) { throw NotImplemented.ByDesign; }
 
+        [Obsolete("ReflectionOnly loading is not supported on this platform.")]
         [RequiresUnreferencedCode("Types and members the loaded assembly depends on might be removed")]
         public static Assembly ReflectionOnlyLoad(byte[] rawAssembly) { throw new PlatformNotSupportedException(SR.PlatformNotSupported_ReflectionOnly); }
+        [Obsolete("ReflectionOnly loading is not supported on this platform.")]
         [RequiresUnreferencedCode("Types and members the loaded assembly depends on might be removed")]
         public static Assembly ReflectionOnlyLoad(string assemblyString) { throw new PlatformNotSupportedException(SR.PlatformNotSupported_ReflectionOnly); }
+        [Obsolete("ReflectionOnly loading is not supported on this platform.")]
         [RequiresUnreferencedCode("Types and members the loaded assembly depends on might be removed")]
         public static Assembly ReflectionOnlyLoadFrom(string assemblyFile) { throw new PlatformNotSupportedException(SR.PlatformNotSupported_ReflectionOnly); }
 

src/libraries/System.Private.CoreLib/src/System/Reflection/StrongNameKeyPair.cs

@@ -29,9 +29,11 @@ public StrongNameKeyPair(byte[] keyPairArray)
         protected StrongNameKeyPair(SerializationInfo info, StreamingContext context) =>
             throw new PlatformNotSupportedException();
 
+        [Obsolete("Strong-name signing is not supported on this platform.")]
         public StrongNameKeyPair(string keyPairContainer) =>
             throw new PlatformNotSupportedException(SR.PlatformNotSupported_StrongNameSigning);
 
+        [Obsolete("Strong-name signing is not supported on this platform.")]
         public byte[] PublicKey =>
             throw new PlatformNotSupportedException(SR.PlatformNotSupported_StrongNameSigning);
 

src/libraries/System.Private.CoreLib/src/System/Type.cs

@@ -541,6 +541,7 @@ public override int GetHashCode()
         }
         public virtual bool Equals(Type? o) => o == null ? false : object.ReferenceEquals(this.UnderlyingSystemType, o.UnderlyingSystemType);
 
+        [Obsolete("ReflectionOnly loading is not supported on this platform.")]
         public static Type? ReflectionOnlyGetType(string typeName, bool throwIfNotFound, bool ignoreCase) => throw new PlatformNotSupportedException(SR.PlatformNotSupported_ReflectionOnly);
 
         public static Binder DefaultBinder

src/libraries/System.Reflection/tests/AssemblyTests.cs

@@ -728,6 +728,7 @@ public void AssemblyLoadFromBytesWithSymbols()
             Assert.Equal(assembly.FullName, loadedAssembly.FullName);
         }
 
+#pragma warning disable CS0618 // ReflectionOnly loading is not supported on this platform.
         [Fact]
         public void AssemblyReflectionOnlyLoadFromString()
         {
@@ -750,6 +751,7 @@ public void AssemblyReflectionOnlyLoadFromNeg()
             Assert.Throws<PlatformNotSupportedException>(() => Assembly.ReflectionOnlyLoad(string.Empty));
             Assert.Throws<PlatformNotSupportedException>(() => Assembly.ReflectionOnlyLoad((byte[])null));
         }
+#pragma warning restore CS0618
 
         public static IEnumerable<object[]> GetModules_TestData()
         {

src/libraries/System.Runtime/ref/System.Runtime.cs

@@ -4427,6 +4427,7 @@ protected Type() { }
         public virtual System.Type MakePointerType() { throw null; }
         public static bool operator ==(System.Type? left, System.Type? right) { throw null; }
         public static bool operator !=(System.Type? left, System.Type? right) { throw null; }
+        [System.ObsoleteAttribute("ReflectionOnly loading is not supported on this platform.")]
         public static System.Type? ReflectionOnlyGetType(string typeName, bool throwIfNotFound, bool ignoreCase) { throw null; }
         public override string ToString() { throw null; }
     }
@@ -7798,10 +7799,13 @@ public virtual void GetObjectData(System.Runtime.Serialization.SerializationInfo
         public static System.Reflection.Assembly? LoadWithPartialName(string partialName) { throw null; }
         public static bool operator ==(System.Reflection.Assembly? left, System.Reflection.Assembly? right) { throw null; }
         public static bool operator !=(System.Reflection.Assembly? left, System.Reflection.Assembly? right) { throw null; }
+        [System.ObsoleteAttribute("ReflectionOnly loading is not supported on this platform.")]
         [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCodeAttribute("Types and members the loaded assembly depends on might be removed")]
         public static System.Reflection.Assembly ReflectionOnlyLoad(byte[] rawAssembly) { throw null; }
+        [System.ObsoleteAttribute("ReflectionOnly loading is not supported on this platform.")]
         [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCodeAttribute("Types and members the loaded assembly depends on might be removed")]
         public static System.Reflection.Assembly ReflectionOnlyLoad(string assemblyString) { throw null; }
+        [System.ObsoleteAttribute("ReflectionOnly loading is not supported on this platform.")]
         [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCodeAttribute("Types and members the loaded assembly depends on might be removed")]
         public static System.Reflection.Assembly ReflectionOnlyLoadFrom(string assemblyFile) { throw null; }
         public override string ToString() { throw null; }
@@ -8773,7 +8777,9 @@ public partial class StrongNameKeyPair : System.Runtime.Serialization.IDeseriali
         public StrongNameKeyPair(byte[] keyPairArray) { }
         public StrongNameKeyPair(System.IO.FileStream keyPairFile) { }
         protected StrongNameKeyPair(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context) { }
+        [System.ObsoleteAttribute("Strong-name signing is not supported on this platform.")]
         public StrongNameKeyPair(string keyPairContainer) { }
+        [System.ObsoleteAttribute("Strong-name signing is not supported on this platform.")]
         public byte[] PublicKey { get { throw null; } }
         void System.Runtime.Serialization.IDeserializationCallback.OnDeserialization(object? sender) { }
         void System.Runtime.Serialization.ISerializable.GetObjectData(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context) { }

src/libraries/System.Runtime/tests/System/Reflection/StrongNameKeyPairTests.cs

@@ -50,7 +50,7 @@ public void Ctor_NullKeyPairFile_ThrowsArgumentNullException()
         {
             AssertExtensions.Throws<ArgumentNullException>("keyPairFile", () => new StrongNameKeyPair((FileStream)null));
         }
-
+#pragma warning disable CS0618 // Strong-name signing is not supported on this platform.
         [Theory]
         [InlineData(null)]
         [InlineData("")]
@@ -72,7 +72,7 @@ public void PublicKey_Get_ThrowsPlatformNotSupportedException()
             var keyPair = new StrongNameKeyPair(new byte[0]);
             Assert.Throws<PlatformNotSupportedException>(() => keyPair.PublicKey);
         }
-
+#pragma warning restore CS0618
         [Fact]
         public void GetObjectData_Invoke_ThrowsPlatformNotSupportedException()
         {

src/libraries/System.Runtime/tests/System/Type/TypeTests.cs

@@ -570,9 +570,11 @@ public void GetTypeCode_ValidType_ReturnsExpected(Type t, TypeCode typeCode)
         [Fact]
         public void ReflectionOnlyGetType()
         {
+#pragma warning disable CS0618 // ReflectionOnly loading is not supported on this platform.
             Assert.Throws<PlatformNotSupportedException>(() => Type.ReflectionOnlyGetType(null, true, false));
             Assert.Throws<PlatformNotSupportedException>(() => Type.ReflectionOnlyGetType("", true, true));
             Assert.Throws<PlatformNotSupportedException>(() => Type.ReflectionOnlyGetType("System.Tests.TypeTests", false, true));
+#pragma warning restore CS0618
         }
 
         [Fact]