rename StringFormat property

src/Shared/HandyControl_Shared/Controls/Input/NumericUpDown.cs

@@ -153,21 +153,11 @@ namespace HandyControl.Controls
             }
         }
 
-        private string CurrentText
-        {
-            get
-            {
-                if (string.IsNullOrWhiteSpace(StringFormat))
-                {
-                    return DecimalPlaces.HasValue ? Value.ToString($"#0.{new string('0', DecimalPlaces.Value)}") : 
-                                                    Value.ToString("#0");
-                }
-                else
-                {
-                    return Value.ToString(StringFormat);
-                }
-            }
-        }
+        private string CurrentText => string.IsNullOrWhiteSpace(ValueFormat)
+            ? DecimalPlaces.HasValue
+                ? Value.ToString($"#0.{new string('0', DecimalPlaces.Value)}")
+                : Value.ToString("#0")
+            : Value.ToString(ValueFormat);
 
         protected virtual void OnValueChanged(FunctionEventArgs<double> e) => RaiseEvent(e);
 
@@ -333,16 +323,16 @@ namespace HandyControl.Controls
         /// <summary>
         ///     指示要显示的数字的格式
         /// </summary>
-        public static readonly DependencyProperty StringFormatProperty =
-            DependencyProperty.Register("StringFormat", typeof(string), typeof(NumericUpDown), new PropertyMetadata(default(string)));
+        public static readonly DependencyProperty ValueFormatProperty = DependencyProperty.Register(
+            "ValueFormat", typeof(string), typeof(NumericUpDown), new PropertyMetadata(default(string)));
 
         /// <summary>
         ///     指示要显示的数字的格式，这将会覆盖 <see cref="DecimalPlaces"/> 属性
         /// </summary>
-        public string StringFormat
+        public string ValueFormat
         {
-            get { return (string)GetValue(StringFormatProperty); }
-            set { SetValue(StringFormatProperty, value); }
+            get => (string) GetValue(ValueFormatProperty);
+            set => SetValue(ValueFormatProperty, value);
         }
 
         /// <summary>