.NET 5 and cross-platform support

.vs/ProjectSettings.json

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+{
+  "CurrentProjectSetting": null
+}

.vs/Sanford.Multimedia.Midi/project-colors.json

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+{
+  "Version": 1,
+  "ProjectMap": {
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+      "ColorIndex": 0
+    },
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+      "ColorIndex": 1
+    },
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+      "ProjectGuid": "c8817129-4d17-4d2e-a2e8-d3e39ae39695",
+      "DisplayName": "SkiaSharp.AnalogClock",
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+    },
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+      "ProjectGuid": "a2fe74e1-b743-11d0-ae1a-00a0c90fffc3",
+      "DisplayName": "Miscellaneous Files",
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+    },
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+      "ProjectGuid": "1c2c2dfa-3061-42fa-8527-a6ed8d3e5404",
+      "DisplayName": "GTKTest",
+      "ColorIndex": 3
+    },
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+      "ProjectGuid": "90480ce5-e392-4713-ab5c-7d659aca0b85",
+      "DisplayName": "SequencerDemo.Windows",
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+    },
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+      "ProjectGuid": "184f8b7c-7f49-4308-86c3-f04f91d6f3ad",
+      "DisplayName": "SkiaSharp.PianoKeys.Test.WindowsForms",
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+    },
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+      "ProjectGuid": "4269c72a-8d3a-4737-8f89-72eaa33ea9e1",
+      "DisplayName": "Sanford.Multimedia.Midi.Core",
+      "ColorIndex": 6
+    },
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+    },
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+    },
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+      "ProjectGuid": "2f082562-a6d1-45d7-a309-d625ddb706fd",
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+      "ProjectGuid": "64769287-e4a4-473a-9eb4-d33984fc51e3",
+      "DisplayName": "UI.WindowsForms",
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+    },
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+      "ProjectGuid": "448955c0-78cf-4e9b-8bfb-e0badb8602db",
+      "DisplayName": "UI.WindowsForms",
+      "ColorIndex": 12
+    }
+  },
+  "NextColorIndex": 13
+}

.vs/VSWorkspaceState.json

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+{
+  "ExpandedNodes": [
+    ""
+  ],
+  "PreviewInSolutionExplorer": false
+}

Demo/MidiWatcher/Gtk/MainWindow.cs

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+using System;
+using Gtk;
+using UI = Gtk.Builder.ObjectAttribute;
+
+namespace Sanford.Multimedia.Midi
+{
+    class MainWindow : Window
+    {
+        [UI] private Label _label1 = null;
+        [UI] private Button _button1 = null;
+
+        private int _counter;
+
+        public MainWindow() : this(new Builder("MainWindow.glade")) { }
+
+        private MainWindow(Builder builder) : base(builder.GetRawOwnedObject("MainWindow"))
+        {
+            builder.Autoconnect(this);
+
+            DeleteEvent += Window_DeleteEvent;
+            _button1.Clicked += Button1_Clicked;
+        }
+
+        private void Window_DeleteEvent(object sender, DeleteEventArgs a)
+        {
+            Application.Quit();
+        }
+
+        private void Button1_Clicked(object sender, EventArgs a)
+        {
+            _counter++;
+            _label1.Text = "Hello World! This button has been clicked " + _counter + " time(s).";
+        }
+    }
+}

Demo/MidiWatcher/Gtk/MainWindow.glade

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk+" version="3.18"/>
+  <object class="GtkWindow" id="MainWindow">
+    <property name="can_focus">False</property>
+    <property name="title" translatable="yes">Example Window</property>
+    <property name="default_width">480</property>
+    <property name="default_height">240</property>
+    <child>
+      <object class="GtkBox">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="margin_left">4</property>
+        <property name="margin_right">4</property>
+        <property name="margin_top">4</property>
+        <property name="margin_bottom">4</property>
+        <property name="orientation">vertical</property>
+        <child>
+          <object class="GtkLabel" id="_label1">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="label" translatable="yes">Hello World!</property>
+          </object>
+          <packing>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkButton" id="_button1">
+            <property name="label" translatable="yes">Click me!</property>
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="receives_default">True</property>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="position">1</property>
+          </packing>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>

Demo/MidiWatcher/Gtk/MidiWatcher.Gtk.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Remove="**\*.glade" />
+    <EmbeddedResource Include="**\*.glade">
+      <LogicalName>%(Filename)%(Extension)</LogicalName>
+    </EmbeddedResource>
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="GtkSharp" Version="3.24.24.*" />
+  </ItemGroup>
+
+</Project>

Demo/MidiWatcher/Gtk/Program.cs

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+using System;
+using Gtk;
+
+namespace Sanford.Multimedia.Midi
+{
+    class Program
+    {
+        [STAThread]
+        public static void Main(string[] args)
+        {
+            Application.Init();
+
+            var app = new Application("org.Sanford.Multimedia.Midi.Sanford.Multimedia.Midi", GLib.ApplicationFlags.None);
+            app.Register(GLib.Cancellable.Current);
+
+            var win = new MainWindow();
+            app.AddWindow(win);
+
+            win.Show();
+            Application.Run();
+        }
+    }
+}