Initial commits

examples/Cli/Demo/Verbosity.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Globalization;
+
+namespace Demo;
+
+public enum Verbosity
+{
+    Quiet,
+    Minimal,
+    Normal,
+    Detailed,
+    Diagnostic
+}
+
+public sealed class VerbosityConverter : TypeConverter
+{
+    private readonly Dictionary<string, Verbosity> _lookup;
+
+    public VerbosityConverter()
+    {
+        _lookup = new Dictionary<string, Verbosity>(StringComparer.OrdinalIgnoreCase)
+            {
+                { "q", Verbosity.Quiet },
+                { "quiet", Verbosity.Quiet },
+                { "m", Verbosity.Minimal },
+                { "minimal", Verbosity.Minimal },
+                { "n", Verbosity.Normal },
+                { "normal", Verbosity.Normal },
+                { "d", Verbosity.Detailed },
+                { "detailed", Verbosity.Detailed },
+                { "diag", Verbosity.Diagnostic },
+                { "diagnostic", Verbosity.Diagnostic }
+            };
+    }
+
+    public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
+    {
+        if (value is string stringValue)
+        {
+            var result = _lookup.TryGetValue(stringValue, out var verbosity);
+            if (!result)
+            {
+                const string format = "The value '{0}' is not a valid verbosity.";
+                var message = string.Format(CultureInfo.InvariantCulture, format, value);
+                throw new InvalidOperationException(message);
+            }
+            return verbosity;
+        }
+        throw new NotSupportedException("Can't convert value to verbosity.");
+    }
+}