Add Configuration type

CommunityToolkit.Mvvm/Properties/Configuration.cs

@@ -0,0 +1,39 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.ComponentModel;
+using System.Diagnostics.Contracts;
+
+/// <summary>
+/// A container for all shared <see cref="AppContext"/> configuration switches for the MVVM Toolkit.
+/// </summary>
+internal static class Configuration
+{
+    /// <summary>
+    /// The configuration property name for <see cref="IsINotifyPropertyChangingDisabled"/>.
+    /// </summary>
+    private const string DisableINotifyPropertyChangingSupport = "MVVMTOOLKIT_DISABLE_INOTIFYPROPERTYCHANGING";
+
+    /// <summary>
+    /// Indicates whether or not support for <see cref="INotifyPropertyChanging"/> is disabled.
+    /// </summary>
+    public static readonly bool IsINotifyPropertyChangingDisabled = GetConfigurationValue(DisableINotifyPropertyChangingSupport);
+
+    /// <summary>
+    /// Gets a configuration value for a specified property.
+    /// </summary>
+    /// <param name="propertyName">The property name to retrieve the value for.</param>
+    /// <returns>The value of the specified configuration setting.</returns>
+    [Pure]
+    private static bool GetConfigurationValue(string propertyName)
+    {
+        if (AppContext.TryGetSwitch(propertyName, out bool isEnabled))
+        {
+            return isEnabled;
+        }
+
+        return false;
+    }
+}