Add NRT metadata

QRCoder/AbstractQRCode.cs

@@ -5,6 +5,7 @@ public abstract class AbstractQRCode
         protected QRCodeData QrCodeData { get; set; }
 
         protected AbstractQRCode() {
+            this.QrCodeData = null!;
         }
 
         protected AbstractQRCode(QRCodeData data) {
@@ -22,7 +23,7 @@ virtual public void SetQRCodeData(QRCodeData data) {
         public void Dispose()
         {
             this.QrCodeData?.Dispose();
-            this.QrCodeData = null;
+            this.QrCodeData = null!;
         }
     }
 }

QRCoder/ArtQRCode.cs

@@ -40,7 +40,7 @@ public Bitmap GetGraphic(int pixelsPerModule)
         /// </summary>
         /// <param name="backgroundImage">A bitmap object that will be used as background picture</param>
         /// <returns>QRCode graphic as bitmap</returns>
-        public Bitmap GetGraphic(Bitmap backgroundImage = null)
+        public Bitmap GetGraphic(Bitmap? backgroundImage = null)
         {
             return this.GetGraphic(10, Color.Black, Color.White, Color.Transparent, backgroundImage: backgroundImage);
         }
@@ -59,9 +59,9 @@ public Bitmap GetGraphic(Bitmap backgroundImage = null)
         /// <param name="backgroundImageStyle">Style of the background image (if set). Fill=spanning complete graphic; DataAreaOnly=Don't paint background into quietzone</param>
         /// <param name="finderPatternImage">Optional image that should be used instead of the default finder patterns</param>
         /// <returns>QRCode graphic as bitmap</returns>
-        public Bitmap GetGraphic(int pixelsPerModule, Color darkColor, Color lightColor, Color backgroundColor, Bitmap backgroundImage = null, double pixelSizeFactor = 1, 
+        public Bitmap GetGraphic(int pixelsPerModule, Color darkColor, Color lightColor, Color backgroundColor, Bitmap? backgroundImage = null, double pixelSizeFactor = 1, 
                                  bool drawQuietZones = true, QuietZoneStyle quietZoneRenderingStyle = QuietZoneStyle.Dotted, 
-                                 BackgroundImageStyle backgroundImageStyle = BackgroundImageStyle.DataAreaOnly, Bitmap finderPatternImage = null)
+                                 BackgroundImageStyle backgroundImageStyle = BackgroundImageStyle.DataAreaOnly, Bitmap? finderPatternImage = null)
         {
             if (pixelSizeFactor > 1)
                 throw new Exception("The parameter pixelSize must be between 0 and 1. (0-100%)");
@@ -211,8 +211,6 @@ private bool IsPartOfFinderPattern(int x, int y, int numModules, int offset)
         /// <returns>Resized image as bitmap</returns>
         private Bitmap Resize(Bitmap image, int newSize)
         {
-            if (image == null) return null;
-
             float scale = Math.Min((float)newSize / image.Width, (float)newSize / image.Height);
             var scaledWidth = (int)(image.Width * scale);
             var scaledHeight = (int)(image.Height * scale);
@@ -284,9 +282,9 @@ public static class ArtQRCodeHelper
         /// <param name="finderPatternImage">Optional image that should be used instead of the default finder patterns</param>
         /// <returns>QRCode graphic as bitmap</returns>
         public static Bitmap GetQRCode(string plainText, int pixelsPerModule, Color darkColor, Color lightColor, Color backgroundColor, ECCLevel eccLevel, bool forceUtf8 = false, 
-                                       bool utf8BOM = false, EciMode eciMode = EciMode.Default, int requestedVersion = -1, Bitmap backgroundImage = null, double pixelSizeFactor = 1.0,
+                                       bool utf8BOM = false, EciMode eciMode = EciMode.Default, int requestedVersion = -1, Bitmap? backgroundImage = null, double pixelSizeFactor = 1.0,
                                        bool drawQuietZones = true, QuietZoneStyle quietZoneRenderingStyle = QuietZoneStyle.Flat, 
-                                       BackgroundImageStyle backgroundImageStyle = BackgroundImageStyle.DataAreaOnly, Bitmap finderPatternImage = null)
+                                       BackgroundImageStyle backgroundImageStyle = BackgroundImageStyle.DataAreaOnly, Bitmap? finderPatternImage = null)
         {
             using (var qrGenerator = new QRCodeGenerator())
             using (var qrCodeData = qrGenerator.CreateQrCode(plainText, eccLevel, forceUtf8, utf8BOM, eciMode, requestedVersion))

QRCoder/Attributes/NotNullWhenAttribute.cs

@@ -0,0 +1,27 @@
+#if !NETCOREAPP
+namespace System.Diagnostics.CodeAnalysis
+{
+    /// <summary>
+    /// Specifies that when a method returns System.Diagnostics.CodeAnalysis.NotNullWhenAttribute.ReturnValue,
+    /// the parameter will not be null even if the corresponding type allows it.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Parameter, Inherited = false)]
+    internal sealed class NotNullWhenAttribute : Attribute
+    {
+        /// <summary>
+        /// Initializes the attribute with the specified return value condition.
+        /// </summary>
+        /// <param name="returnValue">If the method returns this value, the associated parameter will not be null.</param>
+        public NotNullWhenAttribute(bool returnValue)
+        {
+            ReturnValue = returnValue;
+        }
+
+        /// <summary>
+        /// Gets the return value condition. If the method returns this value, the associated
+        /// parameter will not be null.
+        /// </summary>
+        public bool ReturnValue { get; }
+    }
+}
+#endif

QRCoder/Extensions/StringExtensions.cs

@@ -1,3 +1,5 @@
+using System.Diagnostics.CodeAnalysis;
+
 namespace QRCoder
 {
     internal static class StringExtensions
@@ -8,7 +10,9 @@ internal static class StringExtensions
         /// <returns>
         ///   <see langword="true"/> if the <paramref name="value"/> is null, empty, or white space; otherwise, <see langword="false"/>.
         /// </returns>
-        public static bool IsNullOrWhiteSpace(this string value)
+        public static bool IsNullOrWhiteSpace(
+            [NotNullWhen(false)]
+            this string? value)
         {
 #if NET35
             if (value == null) return true;

QRCoder/Extensions/StringValueAttribute.cs

@@ -44,15 +44,15 @@ public static class CustomExtensions
 #if NET6_0_OR_GREATER
         [RequiresUnreferencedCode("This method uses reflection to examine the provided enum value.")]
 #endif
-        public static string GetStringValue(this Enum value)
+        public static string? GetStringValue(this Enum value)
         {            
 #if NETSTANDARD1_3
             var fieldInfo = value.GetType().GetRuntimeField(value.ToString());
 #else
-            var fieldInfo = value.GetType().GetField(value.ToString());
+            var fieldInfo = value.GetType().GetField(value.ToString())!;
 #endif
             var attr = fieldInfo.GetCustomAttributes(typeof(StringValueAttribute), false) as StringValueAttribute[];
-            return attr.Length > 0 ? attr[0].StringValue : null;
+            return attr!.Length > 0 ? attr[0].StringValue : null;
         }
     }
 }

QRCoder/PayloadGenerator/BezahlCode.cs

@@ -9,7 +9,8 @@ public class BezahlCode : Payload
         {
             //BezahlCode specification: http://www.bezahlcode.de/wp-content/uploads/BezahlCode_TechDok.pdf
 
-            private readonly string name, iban, bic, account, bnc, sepaReference, reason, creditorId, mandateId, periodicTimeunit;
+            private readonly string? iban, bic, account, bnc, sepaReference, creditorId, mandateId, periodicTimeunit;
+            private readonly string name, reason;
             private readonly decimal amount;
             private readonly int postingKey, periodicTimeunitRotation;
             private readonly Currency currency;

QRCoder/PayloadGenerator/BitcoinAddress.cs

@@ -4,7 +4,7 @@ public static partial class PayloadGenerator
     {
         public class BitcoinAddress : BitcoinLikeCryptoCurrencyAddress
         {
-            public BitcoinAddress(string address, double? amount, string label = null, string message = null)
+            public BitcoinAddress(string address, double? amount, string? label = null, string? message = null)
                 : base(BitcoinLikeCryptoCurrencyType.Bitcoin, address, amount, label, message) { }
         }
     }

QRCoder/PayloadGenerator/BitcoinCashAddress.cs

@@ -4,7 +4,7 @@ public static partial class PayloadGenerator
     {
         public class BitcoinCashAddress : BitcoinLikeCryptoCurrencyAddress
         {
-            public BitcoinCashAddress(string address, double? amount, string label = null, string message = null)
+            public BitcoinCashAddress(string address, double? amount, string? label = null, string? message = null)
                 : base(BitcoinLikeCryptoCurrencyType.BitcoinCash, address, amount, label, message) { }
         }
     }

QRCoder/PayloadGenerator/BitcoinLikeCryptoCurrencyAddress.cs

@@ -10,7 +10,8 @@ public static partial class PayloadGenerator
         public class BitcoinLikeCryptoCurrencyAddress : Payload
         {
             private readonly BitcoinLikeCryptoCurrencyType currencyType;
-            private readonly string address, label, message;
+            private readonly string address;
+            private readonly string? label, message;
             private readonly double? amount;
 
             /// <summary>
@@ -21,7 +22,7 @@ public class BitcoinLikeCryptoCurrencyAddress : Payload
             /// <param name="amount">Amount of coins to transfer</param>
             /// <param name="label">Reference label</param>
             /// <param name="message">Referece text aka message</param>
-            public BitcoinLikeCryptoCurrencyAddress(BitcoinLikeCryptoCurrencyType currencyType, string address, double? amount, string label = null, string message = null)
+            public BitcoinLikeCryptoCurrencyAddress(BitcoinLikeCryptoCurrencyType currencyType, string address, double? amount, string? label = null, string? message = null)
             {
                 this.currencyType = currencyType;
                 this.address = address;
@@ -41,12 +42,12 @@ public BitcoinLikeCryptoCurrencyAddress(BitcoinLikeCryptoCurrencyType currencyTy
 
             public override string ToString()
             {
-                string query = null;
+                string? query = null;
 
-                var queryValues = new KeyValuePair<string,string>[]{
-                  new KeyValuePair<string, string>(nameof(label), label),
-                  new KeyValuePair<string, string>(nameof(message), message),
-                  new KeyValuePair<string, string>(nameof(amount), amount.HasValue ? amount.Value.ToString("#.########", CultureInfo.InvariantCulture) : null)
+                var queryValues = new KeyValuePair<string,string?>[]{
+                  new KeyValuePair<string, string?>(nameof(label), label),
+                  new KeyValuePair<string, string?>(nameof(message), message),
+                  new KeyValuePair<string, string?>(nameof(amount), amount.HasValue ? amount.Value.ToString("#.########", CultureInfo.InvariantCulture) : null)
                 };
 
                 if (queryValues.Any(keyPair => !string.IsNullOrEmpty(keyPair.Value)))
@@ -57,7 +58,7 @@ public override string ToString()
                         .ToArray());
                 }
 
-                return $"{Enum.GetName(typeof(BitcoinLikeCryptoCurrencyType), currencyType).ToLower()}:{address}{query}";
+                return $"{Enum.GetName(typeof(BitcoinLikeCryptoCurrencyType), currencyType)!.ToLower()}:{address}{query}";
             }
 
             public enum BitcoinLikeCryptoCurrencyType

QRCoder/PayloadGenerator/CalendarEvent.cs

@@ -6,7 +6,8 @@ public static partial class PayloadGenerator
     {
         public class CalendarEvent : Payload
         {
-            private readonly string subject, description, location, start, end;
+            private readonly string subject, start, end;
+            private readonly string? description, location;
             private readonly EventEncoding encoding;
 
             /// <summary>
@@ -19,7 +20,7 @@ public class CalendarEvent : Payload
             /// <param name="end">End time (incl. UTC offset) of the event</param>
             /// <param name="allDayEvent">Is it a full day event?</param>
             /// <param name="encoding">Type of encoding (universal or iCal)</param>
-            public CalendarEvent(string subject, string description, string location, DateTimeOffset start, DateTimeOffset end, bool allDayEvent, EventEncoding encoding = EventEncoding.Universal) : this(subject, description, location, start.UtcDateTime, end.UtcDateTime, allDayEvent, encoding)
+            public CalendarEvent(string subject, string? description, string? location, DateTimeOffset start, DateTimeOffset end, bool allDayEvent, EventEncoding encoding = EventEncoding.Universal) : this(subject, description, location, start.UtcDateTime, end.UtcDateTime, allDayEvent, encoding)
             {
             }
 
@@ -33,7 +34,7 @@ public CalendarEvent(string subject, string description, string location, DateTi
             /// <param name="end">End time of the event</param>
             /// <param name="allDayEvent">Is it a full day event?</param>
             /// <param name="encoding">Type of encoding (universal or iCal)</param>
-            public CalendarEvent(string subject, string description, string location, DateTime start, DateTime end, bool allDayEvent, EventEncoding encoding = EventEncoding.Universal)
+            public CalendarEvent(string subject, string? description, string? location, DateTime start, DateTime end, bool allDayEvent, EventEncoding encoding = EventEncoding.Universal)
             {
                 this.subject = subject;
                 this.description = description;

QRCoder/PayloadGenerator/ContactData.cs

@@ -8,22 +8,22 @@ public class ContactData : Payload
         {
             private readonly string firstname;
             private readonly string lastname;
-            private readonly string nickname;
-            private readonly string org;
-            private readonly string orgTitle;
-            private readonly string phone;
-            private readonly string mobilePhone;
-            private readonly string workPhone;
-            private readonly string email;
+            private readonly string? nickname;
+            private readonly string? org;
+            private readonly string? orgTitle;
+            private readonly string? phone;
+            private readonly string? mobilePhone;
+            private readonly string? workPhone;
+            private readonly string? email;
             private readonly DateTime? birthday;
-            private readonly string website;
-            private readonly string street;
-            private readonly string houseNumber;
-            private readonly string city;
-            private readonly string zipCode;
-            private readonly string stateRegion;
-            private readonly string country;
-            private readonly string note;
+            private readonly string? website;
+            private readonly string? street;
+            private readonly string? houseNumber;
+            private readonly string? city;
+            private readonly string? zipCode;
+            private readonly string? stateRegion;
+            private readonly string? country;
+            private readonly string? note;
             private readonly ContactOutputType outputType;
             private readonly AddressOrder addressOrder;
 
@@ -51,7 +51,7 @@ public class ContactData : Payload
             /// <param name="note">Memo text / notes</param>            
             /// <param name="org">Organisation/Company</param>            
             /// <param name="orgTitle">Organisation/Company Title</param>            
-            public ContactData(ContactOutputType outputType, string firstname, string lastname, string nickname = null, string phone = null, string mobilePhone = null, string workPhone = null, string email = null, DateTime? birthday = null, string website = null, string street = null, string houseNumber = null, string city = null, string zipCode = null, string country = null, string note = null, string stateRegion = null, AddressOrder addressOrder = AddressOrder.Default, string org = null, string orgTitle = null)
+            public ContactData(ContactOutputType outputType, string firstname, string lastname, string? nickname = null, string? phone = null, string? mobilePhone = null, string? workPhone = null, string? email = null, DateTime? birthday = null, string? website = null, string? street = null, string? houseNumber = null, string? city = null, string? zipCode = null, string? country = null, string? note = null, string? stateRegion = null, AddressOrder addressOrder = AddressOrder.Default, string? org = null, string? orgTitle = null)
             {             
                 this.firstname = firstname;
                 this.lastname = lastname;

QRCoder/PayloadGenerator/LitecoinAddress.cs

@@ -4,7 +4,7 @@ public static partial class PayloadGenerator
     {
         public class LitecoinAddress : BitcoinLikeCryptoCurrencyAddress
         {
-            public LitecoinAddress(string address, double? amount, string label = null, string message = null)
+            public LitecoinAddress(string address, double? amount, string? label = null, string? message = null)
                 : base(BitcoinLikeCryptoCurrencyType.Litecoin, address, amount, label, message) { }
         }
     }

QRCoder/PayloadGenerator/Mail.cs

@@ -8,7 +8,7 @@ public static partial class PayloadGenerator
     {
         public class Mail : Payload
         {
-            private readonly string mailReceiver, subject, message;
+            private readonly string? mailReceiver, subject, message;
             private readonly MailEncoding encoding;
 
 
@@ -19,7 +19,7 @@ public class Mail : Payload
             /// <param name="subject">Subject line of the email</param>
             /// <param name="message">Message content of the email</param>
             /// <param name="encoding">Payload encoding type. Choose dependent on your QR Code scanner app.</param>
-            public Mail(string mailReceiver = null, string subject = null, string message = null, MailEncoding encoding = MailEncoding.MAILTO)
+            public Mail(string? mailReceiver = null, string? subject = null, string? message = null, MailEncoding encoding = MailEncoding.MAILTO)
             {
                 this.mailReceiver = mailReceiver;
                 this.subject = subject;
@@ -42,10 +42,10 @@ public override string ToString()
                         returnVal = $"mailto:{this.mailReceiver}{queryString}";
                         break;
                     case MailEncoding.MATMSG:
-                        returnVal = $"MATMSG:TO:{this.mailReceiver};SUB:{EscapeInput(this.subject)};BODY:{EscapeInput(this.message)};;";
+                        returnVal = $"MATMSG:TO:{this.mailReceiver};SUB:{EscapeInput(this.subject ?? "")};BODY:{EscapeInput(this.message ?? "")};;";
                         break;
                     case MailEncoding.SMTP:
-                        returnVal = $"SMTP:{this.mailReceiver}:{EscapeInput(this.subject, true)}:{EscapeInput(this.message, true)}";
+                        returnVal = $"SMTP:{this.mailReceiver}:{EscapeInput(this.subject ?? "", true)}:{EscapeInput(this.message ?? "", true)}";
                         break;
                 }
                 return returnVal;