hc:DateTimePicker support for Validation

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

@@ -156,7 +156,7 @@ namespace HandyControl.Controls
             var isError = !result.Data;
             if (isError)
             {
-                SetCurrentValue(IsErrorProperty, true);
+                SetCurrentValue(IsErrorProperty, ValueBoxes.TrueBox);
                 SetCurrentValue(ErrorStrProperty, result.Message);
             }
             else

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

@@ -427,9 +427,21 @@ namespace HandyControl.Controls
                 }
             }
 
-            IsError = !result.Data;
-            ErrorStr = result.Message;
-            return result.Data;
+            var isError = !result.Data;
+            if (isError)
+            {
+                SetCurrentValue(IsErrorProperty, ValueBoxes.TrueBox);
+                SetCurrentValue(ErrorStrProperty, result.Message);
+            }
+            else
+            {
+                isError = Validation.GetHasError(this);
+                if (isError)
+                {
+                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
+                }
+            }
+            return !isError;
         }
 
         public override string ToString() => SelectedDateTime?.ToString(DateTimeFormat) ?? string.Empty;

src/Shared/HandyControl_Shared/Themes/Styles/Base/DateTimePickerBaseStyle.xaml

@@ -14,6 +14,7 @@
         <Setter Property="BorderThickness" Value="1"/>
         <Setter Property="CaretBrush" Value="{DynamicResource PrimaryTextBrush}"/>
         <Setter Property="VerticalContentAlignment" Value="Center"/>
+        <Setter Property="Validation.ErrorTemplate" Value="{x:Null}"/>
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="hc:DateTimePicker">
@@ -323,6 +324,7 @@
     </ControlTemplate>
 
     <Style x:Key="DateTimePickerPlusBaseStyle" BasedOn="{StaticResource DateTimePickerExtendBaseStyle}" TargetType="hc:DateTimePicker">
+        <Setter Property="IsError" Value="{Binding Path=(Validation.HasError),RelativeSource={RelativeSource Self}}"/>
         <Setter Property="Template" Value="{StaticResource DateTimePickerPlusTopTemplate}"/>
         <Style.Triggers>
             <Trigger Property="hc:InfoElement.TitlePlacement" Value="Left">