Clean up some EXIF documentation

src/ImageSharp/Profiles/Exif/ExifProfile.cs

@@ -117,6 +117,9 @@ namespace ImageSharp
         /// </summary>
         /// <typeparam name="TColor">The pixel format.</typeparam>
         /// <typeparam name="TPacked">The packed format. <example>uint, long, float.</example></typeparam>
+        /// <returns>
+        /// The <see cref="Image{TColor,TPacked}"/>.
+        /// </returns>
         public Image<TColor, TPacked> CreateThumbnail<TColor, TPacked>()
             where TColor : struct, IPackedPixel<TPacked>
             where TPacked : struct
@@ -143,6 +146,9 @@ namespace ImageSharp
         /// Returns the value with the specified tag.
         /// </summary>
         /// <param name="tag">The tag of the EXIF value.</param>
+        /// <returns>
+        /// The <see cref="ExifValue"/>.
+        /// </returns>
         public ExifValue GetValue(ExifTag tag)
         {
             foreach (ExifValue exifValue in this.Values)
@@ -160,6 +166,9 @@ namespace ImageSharp
         /// Removes the value with the specified tag.
         /// </summary>
         /// <param name="tag">The tag of the EXIF value.</param>
+        /// <returns>
+        /// The <see cref="bool"/>.
+        /// </returns>
         public bool RemoveValue(ExifTag tag)
         {
             this.InitializeValues();

src/ImageSharp/Profiles/Exif/ExifTagDescriptionAttribute.cs

@@ -28,6 +28,14 @@ namespace ImageSharp
             this.description = description;
         }
 
+        /// <summary>
+        /// Gets the tag description from any custom attributes.
+        /// </summary>
+        /// <param name="tag">The tag.</param>
+        /// <param name="value">The value.</param>
+        /// <returns>
+        /// The <see cref="string"/>.
+        /// </returns>
         public static string GetDescription(ExifTag tag, object value)
         {
             FieldInfo field = tag.GetType().GetTypeInfo().GetDeclaredField(tag.ToString());
@@ -40,7 +48,7 @@ namespace ImageSharp
             {
                 object attributeValue = customAttribute.ConstructorArguments[0].Value;
 
-                if (Equals(attributeValue, value))
+                if (object.Equals(attributeValue, value))
                 {
                     return (string)customAttribute.ConstructorArguments[1].Value;
                 }

src/ImageSharp/Profiles/Exif/ExifWriter.cs

@@ -10,11 +10,20 @@ namespace ImageSharp
     using System.Collections.ObjectModel;
     using System.Text;
 
+    /// <summary>
+    /// Contains methods for writing EXIF metadata.
+    /// </summary>
     internal sealed class ExifWriter
     {
+        /// <summary>
+        /// The start index.
+        /// </summary>
         private const int StartIndex = 6;
 
-        private static readonly ExifTag[] IfdTags = new ExifTag[127]
+        /// <summary>
+        /// The collection if Image File Directory tags
+        /// </summary>
+        private static readonly ExifTag[] IfdTags =
         {
             ExifTag.SubfileType,
             ExifTag.OldSubfileType,
@@ -145,7 +154,10 @@ namespace ImageSharp
             ExifTag.GDALNoData
         };
 
-        private static readonly ExifTag[] ExifTags = new ExifTag[92]
+        /// <summary>
+        /// The collection of Exif tags
+        /// </summary>
+        private static readonly ExifTag[] ExifTags =
         {
             ExifTag.ExposureTime,
             ExifTag.FNumber,
@@ -241,7 +253,10 @@ namespace ImageSharp
             ExifTag.LensSerialNumber
           };
 
-        private static readonly ExifTag[] GPSTags = new ExifTag[31]
+        /// <summary>
+        /// The collection of GPS tags
+        /// </summary>
+        private static readonly ExifTag[] GPSTags =
         {
             ExifTag.GPSVersionID,
             ExifTag.GPSLatitudeRef,
@@ -276,6 +291,9 @@ namespace ImageSharp
             ExifTag.GPSDifferential
         };
 
+        /// <summary>
+        /// Which parts will be written.
+        /// </summary>
         private ExifParts allowedParts;
         private Collection<ExifValue> values;
         private Collection<int> dataOffsets;