Replacing the ToString overloads with extensions

CodeGen/Generators/UnitsNetGen/QuantityGenerator.cs

@@ -1162,27 +1162,6 @@ public override string ToString()
             return ToString(null, null);
         }}
 
-        /// <summary>
-        ///     Gets the default string representation of value and unit using the given format provider.
-        /// </summary>
-        /// <returns>String representation.</returns>
-        /// <param name=""provider"">Format to use for localization and number formatting. Defaults to <see cref=""CultureInfo.CurrentCulture"" /> if null.</param>
-        public string ToString(IFormatProvider? provider)
-        {{
-            return ToString(null, provider);
-        }}
-
-        /// <inheritdoc cref=""QuantityFormatter.Format{{TQuantity}}(TQuantity, string?, IFormatProvider?)""/>
-        /// <summary>
-        /// Gets the string representation of this instance in the specified format string using <see cref=""CultureInfo.CurrentCulture"" />.
-        /// </summary>
-        /// <param name=""format"">The format string.</param>
-        /// <returns>The string representation.</returns>
-        public string ToString(string? format)
-        {{
-            return ToString(format, null);
-        }}
-
         /// <inheritdoc cref=""QuantityFormatter.Format{{TQuantity}}(TQuantity, string?, IFormatProvider?)""/>
         /// <summary>
         /// Gets the string representation of this instance in the specified format string using the specified format provider, or <see cref=""CultureInfo.CurrentCulture"" /> if null.

UnitsNet.Tests/CustomQuantities/HowMuch.cs

@@ -69,7 +69,6 @@ public IQuantity ToUnit(Enum unit)
 
         public override string ToString() => $"{Value} {Unit}";
         public string ToString(string? format, IFormatProvider? formatProvider) => $"HowMuch ({format}, {formatProvider})";
-        public string ToString(IFormatProvider? provider) => $"HowMuch ({provider})";
 
         #endregion
     }

UnitsNet/Extensions/QuantityExtensions.cs

@@ -0,0 +1,51 @@
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen ([email protected]). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+using System.Globalization;
+
+namespace UnitsNet;
+
+/// <summary>
+/// Provides extension methods applicable to all quantities in the UnitsNet library.
+/// </summary>
+public static class QuantityExtensions
+{
+    /// <summary>
+    ///     Returns the string representation of the specified quantity using the provided format provider.
+    /// </summary>
+    /// <typeparam name="TQuantity">
+    ///     The type of the quantity, which must implement <see cref="IQuantity" /> and
+    ///     <see cref="IFormattable" />.
+    /// </typeparam>
+    /// <param name="quantity">The quantity to convert to a string.</param>
+    /// <param name="formatProvider">
+    ///     The format provider to use for localization and number formatting.
+    ///     If <c>null</c>, the default is <see cref="CultureInfo.CurrentCulture" />.
+    /// </param>
+    /// <returns>A string representation of the quantity.</returns>
+    public static string ToString<TQuantity>(this TQuantity quantity, IFormatProvider? formatProvider)
+        where TQuantity : IQuantity, IFormattable
+    {
+        return quantity.ToString(null, formatProvider);
+    }
+
+    /// <summary>
+    ///     Returns the string representation of the specified quantity using the provided format string.
+    /// </summary>
+    /// <typeparam name="TQuantity">
+    ///     The type of the quantity, which must implement <see cref="IQuantity" /> and
+    ///     <see cref="IFormattable" />.
+    /// </typeparam>
+    /// <param name="quantity">The quantity to convert to a string.</param>
+    /// <param name="format">
+    ///     The format string to use for formatting the quantity.
+    ///     If <c>null</c> or empty, the default format is used.
+    /// </param>
+    /// <returns>A string representation of the quantity.</returns>
+    public static string ToString<TQuantity>(this TQuantity quantity, string? format)
+        where TQuantity : IQuantity, IFormattable
+    {
+        return quantity.ToString(format, null);
+    }
+}