Add GetDisplayName to enum extensions

AMWD.Common/Extensions/EnumExtensions.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
 using System.Linq;
 
 namespace System
@@ -40,5 +41,13 @@ namespace System
 		/// <returns>The description or the string representation of the value.</returns>
 		public static string GetDescription(this Enum value)
 			=> value.GetAttribute<DescriptionAttribute>()?.Description ?? value.ToString();
+
+		/// <summary>
+		/// Returns the name from <see cref="DisplayAttribute"/>.
+		/// </summary>
+		/// <param name="value">The enum value.</param>
+		/// <returns>The display name or the string representation of the value.</returns>
+		public static string GetDisplayName(this Enum value)
+			=> value.GetAttribute<DisplayAttribute>()?.Name ?? value.ToString();
 	}
 }

CHANGELOG.md

@@ -10,6 +10,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Added `directory.build.props` and `directory.build.targets`
+- Added `GetDisplayName()` extension for enums    
+    (`DisplayAttribute(Name = "")`)
 
 
 ## [v1.10.0](https://git.am-wd.de/AM.WD/common/compare/v1.9.0...v1.10.0) - 2022-09-18

UnitTests/Common/Extensions/EnumExtensionsTests.cs

@@ -1,7 +1,8 @@
 using System;
+using System.ComponentModel.DataAnnotations;
 using System.Linq;
-using UnitTests.Common.Utils;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
+using UnitTests.Common.Utils;
 using DescriptionAttribute = System.ComponentModel.DescriptionAttribute;
 
 namespace UnitTests.Common.Extensions
@@ -107,6 +108,22 @@ namespace UnitTests.Common.Extensions
 			Assert.IsFalse(list.Any());
 		}
 
+		[TestMethod]
+		public void ShouldReturnDisplayNameOrStringRepresentation()
+		{
+			// arrange
+			var enumWithDisplayName = TestEnum.Two;
+			var enumWithoutDisplayName = TestEnum.Zero;
+
+			// act
+			string displayName = enumWithDisplayName.GetDisplayName();
+			string noDisplayName = enumWithoutDisplayName.GetDisplayName();
+
+			// assert
+			Assert.AreEqual("Zwei", displayName);
+			Assert.AreEqual(enumWithoutDisplayName.ToString(), noDisplayName);
+		}
+
 		internal enum TestEnum
 		{
 			[CustomMultiple("nix")]
@@ -115,6 +132,7 @@ namespace UnitTests.Common.Extensions
 			Zero,
 			[Description("Eins")]
 			One,
+			[Display(Name = "Zwei")]
 			Two,
 		}
 	}