Use multiple target frameworks for Eto.Forms

src/Eto/Eto.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0</TargetFrameworks>
     <LangVersion>10</LangVersion>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <TreatWarningsAsErrors Condition="$(Configuration) == 'Release'">true</TreatWarningsAsErrors>

src/Eto/Forms/Binding/ICommand.cs

@@ -1,4 +1,4 @@
-#if !NETSTANDARD
+#if !NETSTANDARD && !NETCOREAPP
 using System;
 
 namespace System.Windows.Input

src/Eto/Forms/Clipboard.cs

@@ -205,9 +205,11 @@ public void SetObject(object value, string type)
 		{
 			using (var ms = new MemoryStream())
 			{
+#pragma warning disable SYSLIB0011
 				var binaryFormatter = new BinaryFormatter();
 				binaryFormatter.Serialize(ms, value);
 				SetDataStream(ms, type);
+#pragma warning restore SYSLIB0011
 				return;
 			}
 		}
@@ -273,8 +275,10 @@ public object GetObject(string type)
 			return null;
 		try
 		{
+#pragma warning disable SYSLIB0011
 			var binaryFormatter = new BinaryFormatter();
 			return binaryFormatter.Deserialize(stream);
+#pragma warning restore SYSLIB0011
 		}
 		catch (Exception ex)
 		{

src/Eto/Forms/Controls/Control.cs

@@ -14,7 +14,7 @@ namespace Eto.Forms;
 /// All visual user interface elements should inherit from this class to provide common functionality like binding,
 /// load/unload, and common events.
 /// </remarks>
-#if !NETSTANDARD
+#if !NETSTANDARD && !NETCOREAPP
 	[ToolboxItem(true)]
 	[DesignTimeVisible(true)]
 	[DesignerCategory("Eto.Forms")]

src/Eto/Forms/DataObject.cs

@@ -261,9 +261,11 @@ public void SetObject(object value, string type)
 		{
 			using (var ms = new MemoryStream())
 			{
+#pragma warning disable SYSLIB0011
 				var binaryFormatter = new BinaryFormatter();
 				binaryFormatter.Serialize(ms, value);
 				SetDataStream(ms, type);
+#pragma warning restore SYSLIB0011
 				return;
 			}
 		}
@@ -329,8 +331,10 @@ public object GetObject(string type)
 			return null;
 		try
 		{
+#pragma warning disable SYSLIB0011
 			var binaryFormatter = new BinaryFormatter();
 			return binaryFormatter.Deserialize(stream);
+#pragma warning restore SYSLIB0011
 		}
 		catch (Exception ex)
 		{

src/Eto/PclTypes.cs

@@ -1,4 +1,4 @@
-#if NETSTANDARD
+#if NETSTANDARD || NETCOREAPP
 using System;
 using System.Collections.Generic;
 using System.Globalization;