优化更新代码，添加界面功能并整合

WPFluent/Controls/NumberBox/INumberFormatter.cs

@@ -0,0 +1,29 @@
+
+
+
+// This Source Code is partially based on the source code provided by the .NET Foundation.
+
+// ReSharper disable once CheckNamespace
+namespace WPFluent.Controls;
+
+/// <summary>
+/// An interface that returns a string representation of a provided value, using distinct format methods to format
+/// several data types.
+/// </summary>
+public interface INumberFormatter
+{
+    /// <summary>
+    /// Returns a string representation of a <see cref="double"/> value.
+    /// </summary>
+    string FormatDouble(double? value);
+
+    /// <summary>
+    /// Returns a string representation of an <see cref="int"/> value.
+    /// </summary>
+    string FormatInt(int? value);
+
+    /// <summary>
+    /// Returns a string representation of a <see cref="uint"/> value.
+    /// </summary>
+    string FormatUInt(uint? value);
+}