Split PayloadGenerator into a separate file for each class

QRCoder/PayloadGenerator/BitcoinAddress.cs

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

QRCoder/PayloadGenerator/BitcoinCashAddress.cs

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

QRCoder/PayloadGenerator/BitcoinLikeCryptoCurrencyAddress.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Globalization;
+
+namespace QRCoder
+{
+    public static partial class PayloadGenerator
+    {
+        public class BitcoinLikeCryptoCurrencyAddress : Payload
+        {
+            private readonly BitcoinLikeCryptoCurrencyType currencyType;
+            private readonly string address, label, message;
+            private readonly double? amount;
+
+            /// <summary>
+            /// Generates a Bitcoin like cryptocurrency payment payload. QR Codes with this payload can open a payment app.
+            /// </summary>
+            /// <param name="currencyName">Bitcoin like cryptocurrency address of the payment receiver</param>
+            /// <param name="address">Bitcoin like cryptocurrency address of the payment receiver</param>
+            /// <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)
+            {
+                this.currencyType = currencyType;
+                this.address = address;
+
+                if (!string.IsNullOrEmpty(label))
+                {
+                    this.label = Uri.EscapeDataString(label);
+                }
+
+                if (!string.IsNullOrEmpty(message))
+                {
+                    this.message = Uri.EscapeDataString(message);
+                }
+
+                this.amount = amount;
+            }
+
+            public override string ToString()
+            {
+                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)
+                };
+
+                if (queryValues.Any(keyPair => !string.IsNullOrEmpty(keyPair.Value)))
+                {
+                    query = "?" + string.Join("&", queryValues
+                        .Where(keyPair => !string.IsNullOrEmpty(keyPair.Value))
+                        .Select(keyPair => $"{keyPair.Key}={keyPair.Value}")
+                        .ToArray());
+                }
+
+                return $"{Enum.GetName(typeof(BitcoinLikeCryptoCurrencyType), currencyType).ToLower()}:{address}{query}";
+            }
+
+            public enum BitcoinLikeCryptoCurrencyType
+            {
+                Bitcoin,
+                BitcoinCash,
+                Litecoin
+            }
+        }
+    }
+}

QRCoder/PayloadGenerator/Bookmark.cs

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+namespace QRCoder
+{
+    public static partial class PayloadGenerator
+    {
+        public class Bookmark : Payload
+        {
+            private readonly string url, title;
+
+            /// <summary>
+            /// Generates a bookmark payload. Scanned by an QR Code reader, this one creates a browser bookmark.
+            /// </summary>
+            /// <param name="url">Url of the bookmark</param>
+            /// <param name="title">Title of the bookmark</param>
+            public Bookmark(string url, string title)
+            {
+                this.url = EscapeInput(url);
+                this.title = EscapeInput(title);
+            }
+
+            public override string ToString()
+            {
+                return $"MEBKM:TITLE:{this.title};URL:{this.url};;";
+            }
+        }
+    }
+}

QRCoder/PayloadGenerator/CalendarEvent.cs

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+using System;
+
+namespace QRCoder
+{
+    public static partial class PayloadGenerator
+    {
+        public class CalendarEvent : Payload
+        {
+            private readonly string subject, description, location, start, end;
+            private readonly EventEncoding encoding;
+
+            /// <summary>
+            /// Generates a calender entry/event payload.
+            /// </summary>
+            /// <param name="subject">Subject/title of the calender event</param>
+            /// <param name="description">Description of the event</param>
+            /// <param name="location">Location (lat:long or address) of the event</param>
+            /// <param name="start">Start time (incl. UTC offset) of the event</param>
+            /// <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)
+            {
+            }
+
+            /// <summary>
+            /// Generates a calender entry/event payload.
+            /// </summary>
+            /// <param name="subject">Subject/title of the calender event</param>
+            /// <param name="description">Description of the event</param>
+            /// <param name="location">Location (lat:long or address) of the event</param>
+            /// <param name="start">Start time of the event</param>
+            /// <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)
+            {
+                this.subject = subject;
+                this.description = description;
+                this.location = location;
+                this.encoding = encoding;
+                string dtFormatStart = "yyyyMMdd", dtFormatEnd = "yyyyMMdd";
+                if (!allDayEvent)
+                {
+                    dtFormatStart = dtFormatEnd = "yyyyMMddTHHmmss";
+                    if (start.Kind == DateTimeKind.Utc)
+                        dtFormatStart = "yyyyMMddTHHmmssZ";
+                    if (end.Kind == DateTimeKind.Utc)
+                        dtFormatEnd = "yyyyMMddTHHmmssZ";
+                }                
+                this.start = start.ToString(dtFormatStart);
+                this.end = end.ToString(dtFormatEnd);
+            }
+
+            public override string ToString()
+            {
+                var vEvent = $"BEGIN:VEVENT{Environment.NewLine}";
+                vEvent += $"SUMMARY:{this.subject}{Environment.NewLine}";
+                vEvent += !string.IsNullOrEmpty(this.description) ? $"DESCRIPTION:{this.description}{Environment.NewLine}" : "";
+                vEvent += !string.IsNullOrEmpty(this.location) ? $"LOCATION:{this.location}{Environment.NewLine}" : "";
+                vEvent += $"DTSTART:{this.start}{Environment.NewLine}";
+                vEvent += $"DTEND:{this.end}{Environment.NewLine}";
+                vEvent += "END:VEVENT";
+
+                if (this.encoding == EventEncoding.iCalComplete)
+                    vEvent = $@"BEGIN:VCALENDAR{Environment.NewLine}VERSION:2.0{Environment.NewLine}{vEvent}{Environment.NewLine}END:VCALENDAR";
+
+                return vEvent;
+            }
+
+            public enum EventEncoding
+            {
+                iCalComplete,
+                Universal
+            }
+        }
+    }
+}