Make ImageProperty a readonly struct

src/ImageSharp/MetaData/ImageProperty.cs

@@ -10,10 +10,10 @@ namespace SixLabors.ImageSharp.MetaData
     /// the copyright information, the date, where the image was created
     /// or some other information.
     /// </summary>
-    public class ImageProperty : IEquatable<ImageProperty>
+    public readonly struct ImageProperty : IEquatable<ImageProperty>
     {
         /// <summary>
-        /// Initializes a new instance of the <see cref="ImageProperty"/> class.
+        /// Initializes a new instance of the <see cref="ImageProperty"/> struct.
         /// </summary>
         /// <param name="name">The name of the property.</param>
         /// <param name="value">The value of the property.</param>
@@ -26,7 +26,7 @@ namespace SixLabors.ImageSharp.MetaData
         }
 
         /// <summary>
-        /// Initializes a new instance of the <see cref="ImageProperty"/> class
+        /// Initializes a new instance of the <see cref="ImageProperty"/> struct
         /// by making a copy from another property.
         /// </summary>
         /// <param name="other">
@@ -71,11 +71,6 @@ namespace SixLabors.ImageSharp.MetaData
         /// </returns>
         public static bool operator ==(ImageProperty left, ImageProperty right)
         {
-            if (ReferenceEquals(left, right))
-            {
-                return true;
-            }
-
             return left.Equals(right);
         }
 
@@ -110,7 +105,7 @@ namespace SixLabors.ImageSharp.MetaData
         /// </returns>
         public override bool Equals(object obj)
         {
-            return obj is ImageProperty other && Equals(other);
+            return obj is ImageProperty other && this.Equals(other);
         }
 
         /// <summary>
@@ -153,16 +148,6 @@ namespace SixLabors.ImageSharp.MetaData
         /// <param name="other">An object to compare with this object.</param>
         public bool Equals(ImageProperty other)
         {
-            if (ReferenceEquals(other, null))
-            {
-                return false;
-            }
-
-            if (ReferenceEquals(this, other))
-            {
-                return true;
-            }
-
             return this.Name.Equals(other.Name) && Equals(this.Value, other.Value);
         }
     }

tests/ImageSharp.Tests/MetaData/ImagePropertyTests.cs

@@ -18,13 +18,11 @@ namespace SixLabors.ImageSharp.Tests
         [Fact]
         public void AreEqual()
         {
-            ImageProperty property1 = new ImageProperty("Foo", "Bar");
-            ImageProperty property2 = new ImageProperty("Foo", "Bar");
-            ImageProperty property3 = null;
+            var property1 = new ImageProperty("Foo", "Bar");
+            var property2 = new ImageProperty("Foo", "Bar");
 
             Assert.Equal(property1, property2);
             Assert.True(property1 == property2);
-            Assert.Null(property3);
         }
 
         /// <summary>
@@ -33,15 +31,13 @@ namespace SixLabors.ImageSharp.Tests
         [Fact]
         public void AreNotEqual()
         {
-            ImageProperty property1 = new ImageProperty("Foo", "Bar");
-            ImageProperty property2 = new ImageProperty("Foo", "Foo");
-            ImageProperty property3 = new ImageProperty("Bar", "Bar");
-            ImageProperty property4 = new ImageProperty("Foo", null);
+            var property1 = new ImageProperty("Foo", "Bar");
+            var property2 = new ImageProperty("Foo", "Foo");
+            var property3 = new ImageProperty("Bar", "Bar");
+            var property4 = new ImageProperty("Foo", null);
 
             Assert.False(property1.Equals("Foo"));
 
-            Assert.NotNull(property1);
-
             Assert.NotEqual(property1, property2);
             Assert.True(property1 != property2);
 
@@ -66,7 +62,7 @@ namespace SixLabors.ImageSharp.Tests
         [Fact]
         public void ConstructorAssignsProperties()
         {
-            ImageProperty property = new ImageProperty("Foo", null);
+            var property = new ImageProperty("Foo", null);
             Assert.Equal("Foo", property.Name);
             Assert.Null(property.Value);