Enable recommended analyzers; use invariant culture throughout

.editorconfig

@@ -263,4 +263,4 @@ dotnet_diagnostic.IDE0005.severity = warning
 # Enforce formatting https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/style-rules/formatting-rules#rule-id-ide0055-fix-formatting
 dotnet_diagnostic.IDE0055.severity = error
 dotnet_diagnostic.IDE1006.severity = error
-dotnet_diagnostic.IDE0022.severity = error
+dotnet_diagnostic.IDE0022.severity = none

Directory.Build.props

@@ -40,7 +40,7 @@
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <NoWarn>$(NoWarn);IDE0005</NoWarn>
     <EnableNETAnalyzers>True</EnableNETAnalyzers>
-    <AnalysisMode>None</AnalysisMode>
+    <AnalysisMode>Recommended</AnalysisMode>
   </PropertyGroup>
 
   <!-- Include README for packable projects -->

QRCoder/ASCIIQRCode.cs

@@ -31,7 +31,7 @@ public AsciiQRCode(QRCodeData data) : base(data) { }
     public string GetGraphic(int repeatPerModule, string darkColorString = "██", string whiteSpaceString = "  ", bool drawQuietZones = true, string endOfLine = "\n")
     {
         if (repeatPerModule < 1)
-            throw new Exception("The repeatPerModule-parameter must be 1 or greater.");
+            throw new ArgumentOutOfRangeException(nameof(repeatPerModule), "The repeatPerModule parameter must be 1 or greater.");
         return string.Join(endOfLine, GetLineByLineGraphic(repeatPerModule, darkColorString, whiteSpaceString, drawQuietZones));
     }
 

QRCoder/ArtQRCode.cs

@@ -63,7 +63,7 @@ public Bitmap GetGraphic(int pixelsPerModule, Color darkColor, Color lightColor,
                              BackgroundImageStyle backgroundImageStyle = BackgroundImageStyle.DataAreaOnly, Bitmap? finderPatternImage = null)
     {
         if (pixelSizeFactor > 1)
-            throw new Exception("The parameter pixelSize must be between 0 and 1. (0-100%)");
+            throw new ArgumentOutOfRangeException(nameof(pixelSizeFactor), "The parameter pixelSizeFactor must be between 0 and 1. (0-100%)");
         int pixelSize = (int)Math.Min(pixelsPerModule, Math.Floor(pixelsPerModule * pixelSizeFactor));
 
         var numModules = QrCodeData.ModuleMatrix.Count - (drawQuietZones ? 0 : 8);
@@ -134,7 +134,7 @@ public Bitmap GetGraphic(int pixelsPerModule, Color darkColor, Color lightColor,
     /// <param name="pixelSize">Size of the dots</param>
     /// <param name="brush">Color of the pixels</param>
     /// <returns></returns>
-    private Bitmap MakeDotPixel(int pixelsPerModule, int pixelSize, SolidBrush brush)
+    private static Bitmap MakeDotPixel(int pixelsPerModule, int pixelSize, SolidBrush brush)
     {
         // draw a dot
         var bitmap = new Bitmap(pixelSize, pixelSize);
@@ -168,7 +168,7 @@ private Bitmap MakeDotPixel(int pixelsPerModule, int pixelSize, SolidBrush brush
     /// <param name="y">Y position</param>
     /// <param name="numModules">Total number of modules per row</param>
     /// <returns>true, if position is part of quiet zone</returns>
-    private bool IsPartOfQuietZone(int x, int y, int numModules)
+    private static bool IsPartOfQuietZone(int x, int y, int numModules)
     {
         return
             x < 4 || //left 
@@ -186,7 +186,7 @@ private bool IsPartOfQuietZone(int x, int y, int numModules)
     /// <param name="numModules">Total number of modules per row</param>
     /// <param name="offset">Offset in modules (usually depending on drawQuietZones parameter)</param>
     /// <returns>true, if position is part of any finder pattern</returns>
-    private bool IsPartOfFinderPattern(int x, int y, int numModules, int offset)
+    private static bool IsPartOfFinderPattern(int x, int y, int numModules, int offset)
     {
         var cornerSize = 11 - offset;
         var outerLimitLow = (numModules - cornerSize - 1);
@@ -204,7 +204,7 @@ private bool IsPartOfFinderPattern(int x, int y, int numModules, int offset)
     /// <param name="image"></param>
     /// <param name="newSize"></param>
     /// <returns>Resized image as bitmap</returns>
-    private Bitmap Resize(Bitmap image, int newSize)
+    private static Bitmap Resize(Bitmap image, int newSize)
     {
         float scale = Math.Min((float)newSize / image.Width, (float)newSize / image.Height);
         var scaledWidth = (int)(image.Width * scale);

QRCoder/Base64QRCode.cs

@@ -141,7 +141,7 @@ public string GetGraphic(int pixelsPerModule, Color darkColor, Color lightColor,
 #if NET6_0_OR_GREATER
     [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
-    private string BitmapToBase64(Bitmap bmp, ImageType imgType)
+    private static string BitmapToBase64(Bitmap bmp, ImageType imgType)
     {
         var iFormat = imgType switch
         {

QRCoder/BitmapByteQRCode.cs

@@ -41,7 +41,7 @@ public byte[] GetGraphic(int pixelsPerModule)
     /// <param name="lightColorHtmlHex">The color of the light modules in HTML hex format.</param>
     /// <returns>Returns the QR code graphic as a bitmap byte array.</returns>
     public byte[] GetGraphic(int pixelsPerModule, string darkColorHtmlHex, string lightColorHtmlHex)
-        => GetGraphic(pixelsPerModule, HexColorToByteArray(darkColorHtmlHex), HexColorToByteArray(lightColorHtmlHex));
+        => GetGraphic(pixelsPerModule, darkColorHtmlHex.HexColorToByteArray(), lightColorHtmlHex.HexColorToByteArray());
 
     /// <summary>
     /// Returns the QR code graphic as a bitmap byte array.
@@ -134,29 +134,13 @@ public byte[] GetGraphic(int pixelsPerModule, byte[] darkColorRgb, byte[] lightC
     }
 
 
-    /// <summary>
-    /// Converts a hex color string to a byte array.
-    /// </summary>
-    /// <param name="colorString">The hex color string to convert.</param>
-    /// <returns>Returns the color as a byte array.</returns>
-    private byte[] HexColorToByteArray(string colorString)
-    {
-        if (colorString.StartsWith("#"))
-            colorString = colorString.Substring(1);
-        byte[] byteColor = new byte[colorString.Length / 2];
-        for (int i = 0; i < byteColor.Length; i++)
-            byteColor[i] = byte.Parse(colorString.Substring(i * 2, 2), System.Globalization.NumberStyles.HexNumber, System.Globalization.CultureInfo.InvariantCulture);
-        return byteColor;
-    }
-
-
     /// <summary>
     /// Converts an integer to a 4 bytes and writes them to a byte array at given position
     /// </summary>
     /// <param name="inp">The integer to convert.</param>
     /// <param name="destinationIndex">Index of destinationArray where the converted bytes are written to</param>
     /// <param name="destinationArray">Destination byte array that receives the bytes</param>
-    private void CopyIntAs4ByteToArray(int inp, int destinationIndex, byte[] destinationArray)
+    private static void CopyIntAs4ByteToArray(int inp, int destinationIndex, byte[] destinationArray)
     {
         unchecked
         {

QRCoder/Extensions/StringExtensions.cs

@@ -29,4 +29,30 @@ public static bool IsNullOrWhiteSpace(
         return string.IsNullOrWhiteSpace(value);
 #endif
     }
+
+    /// <summary>
+    /// Converts a hex color string to a byte array.
+    /// </summary>
+    /// <param name="colorString">Color in HEX format like #ffffff.</param>
+    /// <returns>Returns the color as a byte array.</returns>
+    internal static byte[] HexColorToByteArray(this string colorString)
+    {
+        var offset = 0;
+        if (colorString.StartsWith("#", StringComparison.Ordinal))
+            offset = 1;
+        byte[] byteColor = new byte[(colorString.Length - offset) / 2];
+        for (int i = 0; i < byteColor.Length; i++)
+#if HAS_SPAN
+            byteColor[i] = byte.Parse(colorString.AsSpan(i * 2 + offset, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
+#else
+            byteColor[i] = byte.Parse(colorString.Substring(i * 2 + offset, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
+#endif
+        return byteColor;
+    }
+
+#if NETSTANDARD1_3
+    /// <inheritdoc cref="char.ToString()"/>
+    internal static string ToString(this char c, CultureInfo _)
+        => c.ToString();
+#endif
 }

QRCoder/Extensions/StringValueAttribute.cs

@@ -7,6 +7,7 @@ namespace QRCoder.Extensions;
 /// Used to represent a string value for a value in an enum
 /// </summary>
 [Obsolete("This attribute will be removed in a future version of QRCoder.")]
+[AttributeUsage(AttributeTargets.Field)]
 public class StringValueAttribute : Attribute
 {
 

QRCoder/PayloadGenerator.cs

@@ -17,20 +17,24 @@ public static partial class PayloadGenerator
     private static bool IsValidIban(string iban)
     {
         //Clean IBAN
-        var ibanCleared = iban.ToUpper().Replace(" ", "").Replace("-", "");
+        var ibanCleared = iban.ToUpperInvariant().Replace(" ", "").Replace("-", "");
 
         //Check for general structure
         var structurallyValid = Regex.IsMatch(ibanCleared, @"^[a-zA-Z]{2}[0-9]{2}([a-zA-Z0-9]?){16,30}$");
 
         //Check IBAN checksum
         var checksumValid = false;
-        var sum = $"{ibanCleared.Substring(4)}{ibanCleared.Substring(0, 4)}".ToCharArray().Aggregate("", (current, c) => current + (char.IsLetter(c) ? (c - 55).ToString() : c.ToString()));
+        var sum = $"{ibanCleared.Substring(4)}{ibanCleared.Substring(0, 4)}".ToCharArray().Aggregate("", (current, c) => current + (char.IsLetter(c) ? (c - 55).ToString(CultureInfo.InvariantCulture) : c.ToString(CultureInfo.InvariantCulture)));
         int m = 0;
         for (int i = 0; i < (int)Math.Ceiling((sum.Length - 2) / 7d); i++)
         {
             var offset = (i == 0 ? 0 : 2);
             var start = i * 7 + offset;
+#if NET5_0_OR_GREATER
+            var n = string.Concat(i == 0 ? "" : m.ToString(CultureInfo.InvariantCulture), sum.AsSpan(start, Math.Min(9 - offset, sum.Length - start)));
+#else
             var n = (i == 0 ? "" : m.ToString()) + sum.Substring(start, Math.Min(9 - offset, sum.Length - start));
+#endif
             if (!int.TryParse(n, NumberStyles.Any, CultureInfo.InvariantCulture, out m))
                 break;
             m %= 97;
@@ -49,8 +53,8 @@ private static bool IsValidQRIban(string iban)
         var foundQrIid = false;
         try
         {
-            var ibanCleared = iban.ToUpper().Replace(" ", "").Replace("-", "");
-            var possibleQrIid = Convert.ToInt32(ibanCleared.Substring(4, 5));
+            var ibanCleared = iban.ToUpperInvariant().Replace(" ", "").Replace("-", "");
+            var possibleQrIid = Convert.ToInt32(ibanCleared.Substring(4, 5), CultureInfo.InvariantCulture);
             foundQrIid = possibleQrIid >= 30000 && possibleQrIid <= 31999;
         }
         catch { }

QRCoder/PayloadGenerator/BezahlCode.cs

@@ -123,12 +123,12 @@ public BezahlCode(AuthorityType authority, string name, string account, string b
             }
             else if (internalMode == 2)
             {
-#pragma warning disable CS0612
+#pragma warning disable CS0618
                 if (authority != AuthorityType.periodicsinglepayment && authority != AuthorityType.singledirectdebit && authority != AuthorityType.singlepayment)
                     throw new BezahlCodeException("The constructor with 'account' and 'bnc' may only be used with 'non SEPA' authority types. Either choose another authority type or switch constructor.");
                 if (authority == AuthorityType.periodicsinglepayment && (string.IsNullOrEmpty(periodicTimeunit) || periodicTimeunitRotation == 0))
                     throw new BezahlCodeException("When using 'periodicsinglepayment' as authority type, the parameters 'periodicTimeunit' and 'periodicTimeunitRotation' must be set.");
-#pragma warning restore CS0612
+#pragma warning restore CS0618
             }
             else if (internalMode == 3)
             {
@@ -155,17 +155,17 @@ public BezahlCode(AuthorityType authority, string name, string account, string b
             _reason = reason;
 
             //Non-SEPA payment types
-#pragma warning disable CS0612
+#pragma warning disable CS0618
             if (authority == AuthorityType.periodicsinglepayment || authority == AuthorityType.singledirectdebit || authority == AuthorityType.singlepayment || authority == AuthorityType.contact || (authority == AuthorityType.contact_v2 && oldWayFilled))
             {
-#pragma warning restore CS0612
+#pragma warning restore CS0618
 
                 if (!Regex.IsMatch(account.Replace(" ", ""), @"^[0-9]{1,9}$"))
                     throw new BezahlCodeException("The account entered isn't valid.");
-                _account = account.Replace(" ", "").ToUpper();
+                _account = account.Replace(" ", "").ToUpperInvariant();
                 if (!Regex.IsMatch(bnc.Replace(" ", ""), @"^[0-9]{1,9}$"))
                     throw new BezahlCodeException("The bnc entered isn't valid.");
-                _bnc = bnc.Replace(" ", "").ToUpper();
+                _bnc = bnc.Replace(" ", "").ToUpperInvariant();
 
                 if (authority != AuthorityType.contact && authority != AuthorityType.contact_v2)
                 {
@@ -180,10 +180,10 @@ public BezahlCode(AuthorityType authority, string name, string account, string b
             {
                 if (!IsValidIban(iban))
                     throw new BezahlCodeException("The IBAN entered isn't valid.");
-                _iban = iban.Replace(" ", "").ToUpper();
+                _iban = iban.Replace(" ", "").ToUpperInvariant();
                 if (!IsValidBic(bic))
                     throw new BezahlCodeException("The BIC entered isn't valid.");
-                _bic = bic.Replace(" ", "").ToUpper();
+                _bic = bic.Replace(" ", "").ToUpperInvariant();
 
                 if (authority != AuthorityType.contact_v2)
                 {
@@ -205,7 +205,7 @@ public BezahlCode(AuthorityType authority, string name, string account, string b
             //Checks for all payment types
             if (authority != AuthorityType.contact && authority != AuthorityType.contact_v2)
             {
-                if (amount.ToString().Replace(",", ".").Contains(".") && amount.ToString().Replace(",", ".").Split('.')[1].TrimEnd('0').Length > 2)
+                if (amount.ToString(CultureInfo.InvariantCulture).Contains('.') && amount.ToString(CultureInfo.InvariantCulture).Split('.')[1].TrimEnd('0').Length > 2)
                     throw new BezahlCodeException("Amount must have less than 3 digits after decimal point.");
                 if (amount < 0.01m || amount > 999999999.99m)
                     throw new BezahlCodeException("Amount has to at least 0.01 and must be smaller or equal to 999999999.99.");
@@ -221,11 +221,11 @@ public BezahlCode(AuthorityType authority, string name, string account, string b
                         throw new BezahlCodeException("Execution date must be today or in future.");
                     _executionDate = (DateTime)executionDate;
                 }
-#pragma warning disable CS0612
+#pragma warning disable CS0618
                 if (authority == AuthorityType.periodicsinglepayment || authority == AuthorityType.periodicsinglepaymentsepa)
-#pragma warning restore CS0612
+#pragma warning restore CS0618
                 {
-                    if (periodicTimeunit.ToUpper() != "M" && periodicTimeunit.ToUpper() != "W")
+                    if (periodicTimeunit.ToUpperInvariant() != "M" && periodicTimeunit.ToUpperInvariant() != "W")
                         throw new BezahlCodeException("The periodicTimeunit must be either 'M' (monthly) or 'W' (weekly).");
                     _periodicTimeunit = periodicTimeunit;
                     if (periodicTimeunitRotation < 1 || periodicTimeunitRotation > 52)
@@ -253,9 +253,9 @@ public override string ToString()
             if (_authority != AuthorityType.contact && _authority != AuthorityType.contact_v2)
             {
                 //Handle what is same for all payments
-#pragma warning disable CS0612
+#pragma warning disable CS0618
                 if (_authority == AuthorityType.periodicsinglepayment || _authority == AuthorityType.singledirectdebit || _authority == AuthorityType.singlepayment)
-#pragma warning restore CS0612
+#pragma warning restore CS0618
                 {
                     bezahlCodePayload += $"account={_account}&";
                     bezahlCodePayload += $"bnc={_bnc}&";
@@ -277,26 +277,26 @@ public override string ToString()
                         if (!string.IsNullOrEmpty(_mandateId))
                             bezahlCodePayload += $"mandateid={Uri.EscapeDataString(_mandateId)}&";
                         if (_dateOfSignature != DateTime.MinValue)
-                            bezahlCodePayload += $"dateofsignature={_dateOfSignature.ToString("ddMMyyyy")}&";
+                            bezahlCodePayload += $"dateofsignature={_dateOfSignature.ToString("ddMMyyyy", CultureInfo.InvariantCulture)}&";
                     }
                 }
-                bezahlCodePayload += $"amount={_amount:0.00}&".Replace(".", ",");
+                bezahlCodePayload += string.Format(CultureInfo.InvariantCulture, "amount={0:0.00}&", _amount).Replace(".", ",");
 
                 if (!string.IsNullOrEmpty(_reason))
                     bezahlCodePayload += $"reason={Uri.EscapeDataString(_reason)}&";
                 bezahlCodePayload += $"currency={_currency}&";
-                bezahlCodePayload += $"executiondate={_executionDate.ToString("ddMMyyyy")}&";
-#pragma warning disable CS0612
+                bezahlCodePayload += $"executiondate={_executionDate.ToString("ddMMyyyy", CultureInfo.InvariantCulture)}&";
+#pragma warning disable CS0618
                 if (_authority == AuthorityType.periodicsinglepayment || _authority == AuthorityType.periodicsinglepaymentsepa)
                 {
                     bezahlCodePayload += $"periodictimeunit={_periodicTimeunit}&";
                     bezahlCodePayload += $"periodictimeunitrotation={_periodicTimeunitRotation}&";
                     if (_periodicFirstExecutionDate != DateTime.MinValue)
-                        bezahlCodePayload += $"periodicfirstexecutiondate={_periodicFirstExecutionDate.ToString("ddMMyyyy")}&";
+                        bezahlCodePayload += $"periodicfirstexecutiondate={_periodicFirstExecutionDate.ToString("ddMMyyyy", CultureInfo.InvariantCulture)}&";
                     if (_periodicLastExecutionDate != DateTime.MinValue)
-                        bezahlCodePayload += $"periodiclastexecutiondate={_periodicLastExecutionDate.ToString("ddMMyyyy")}&";
+                        bezahlCodePayload += $"periodiclastexecutiondate={_periodicLastExecutionDate.ToString("ddMMyyyy", CultureInfo.InvariantCulture)}&";
                 }
-#pragma warning restore CS0612
+#pragma warning restore CS0618
             }
             else
             {
@@ -1047,6 +1047,7 @@ public enum Currency
         }
 
 
+#pragma warning disable CA1707 // Underscore in identifier
         /// <summary>
         /// Operation modes of the BezahlCode
         /// </summary>
@@ -1055,7 +1056,7 @@ public enum AuthorityType
             /// <summary>
             /// Single payment (Überweisung)
             /// </summary>
-            [Obsolete]
+            [Obsolete("Use singlepaymentsepa instead for SEPA-compliant payments")]
             singlepayment,
             /// <summary>
             /// Single SEPA payment (SEPA-Überweisung)
@@ -1064,7 +1065,7 @@ public enum AuthorityType
             /// <summary>
             /// Single debit (Lastschrift)
             /// </summary>
-            [Obsolete]
+            [Obsolete("Use singledirectdebitsepa instead for SEPA-compliant payments")]
             singledirectdebit,
             /// <summary>
             /// Single SEPA debit (SEPA-Lastschrift)
@@ -1073,7 +1074,7 @@ public enum AuthorityType
             /// <summary>
             /// Periodic payment (Dauerauftrag)
             /// </summary>
-            [Obsolete]
+            [Obsolete("Use periodicsinglepaymentsepa instead for SEPA-compliant payments")]
             periodicsinglepayment,
             /// <summary>
             /// Periodic SEPA payment (SEPA-Dauerauftrag)
@@ -1088,6 +1089,7 @@ public enum AuthorityType
             /// </summary>
             contact_v2
         }
+#pragma warning restore CA1707 // Underscore in identifier
 
         /// <summary>
         /// Exception class for BezahlCode errors.

QRCoder/PayloadGenerator/BitcoinLikeCryptoCurrencyAddress.cs

@@ -61,7 +61,7 @@ public override string ToString()
                     .ToArray());
             }
 
-            return $"{Enum.GetName(typeof(BitcoinLikeCryptoCurrencyType), _currencyType)!.ToLower()}:{_address}{query}";
+            return $"{Enum.GetName(typeof(BitcoinLikeCryptoCurrencyType), _currencyType)!.ToLowerInvariant()}:{_address}{query}";
         }
 
         /// <summary>