From 4729cbfdab60c3cd27694e2703e029d6b33642b0 Mon Sep 17 00:00:00 2001
From: ZX <yanchao4.7@163.com>
Date: Tue, 16 Apr 2019 16:29:55 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0Null2VisibilityConverter?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

value是null的时候隐藏，不为null显示
---
 HandyControl/HandyControl.csproj              |  1 +
 HandyControl/Themes/Basic/Converters.xaml     |  1 +
 .../Converter/Null2VisibilityConverter.cs     | 20 +++++++++++++++++++
 3 files changed, 22 insertions(+)
 create mode 100644 HandyControl/Tools/Converter/Null2VisibilityConverter.cs

diff --git a/HandyControl/HandyControl.csproj b/HandyControl/HandyControl.csproj
index df53b761..f6c8d4ef 100644
--- a/HandyControl/HandyControl.csproj
+++ b/HandyControl/HandyControl.csproj
@@ -156,6 +156,7 @@
     <Compile Include="Data\Gif\GPStream.cs" />
     <Compile Include="Tools\Converter\Boolean2StrConverter.cs" />
     <Compile Include="Tools\Converter\Int2StrConverter.cs" />
+    <Compile Include="Tools\Converter\Null2VisibilityConverter.cs" />
     <Compile Include="Tools\Helper\ColorHelper.cs" />
     <Compile Include="Tools\GifImageAnimator.cs" />
     <Compile Include="Data\GrowlInfo.cs" />
diff --git a/HandyControl/Themes/Basic/Converters.xaml b/HandyControl/Themes/Basic/Converters.xaml
index 8a4d418f..1246361f 100644
--- a/HandyControl/Themes/Basic/Converters.xaml
+++ b/HandyControl/Themes/Basic/Converters.xaml
@@ -15,5 +15,6 @@
     <converter:Object2BooleanConverter x:Key="Object2BooleanConverter"/>
     <converter:Boolean2StrConverter x:Key="Boolean2StrConverter"/>
     <converter:Int2StrConverter x:Key="Int2StrConverter"/>
+    <converter:Null2VisibilityConverter x:Key="Null2VisibilityConverter"/>
 
 </ResourceDictionary>
\ No newline at end of file
diff --git a/HandyControl/Tools/Converter/Null2VisibilityConverter.cs b/HandyControl/Tools/Converter/Null2VisibilityConverter.cs
new file mode 100644
index 00000000..d1edc482
--- /dev/null
+++ b/HandyControl/Tools/Converter/Null2VisibilityConverter.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace HandyControl.Tools.Converter
+{
+    public class Null2VisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return value == null ? Visibility.Collapsed : Visibility.Visible;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}