update to vs2019

src/Shared/HandyControl_Shared/HandyControl_Shared.projitems

@@ -19,6 +19,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\PanelElement.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\PasswordBoxMonitor.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Interactivity\Commands\OpenLinkCommand.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Tools\Extension\StringExtension.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\GlobalShortcut.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\StatusSwitchElement.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\TipElement.cs" />

src/Shared/HandyControl_Shared/Tools/Extension/StringExtension.cs

@@ -0,0 +1,32 @@
+using System;
+using System.ComponentModel;
+
+namespace HandyControl.Tools.Extension
+{
+    public static class StringExtension
+    {
+        public static T Value<T>(this string input)
+        {
+            try
+            {
+                return (T)TypeDescriptor.GetConverter(typeof(T)).ConvertFromString(input);
+            }
+            catch
+            {
+                return default(T);
+            }
+        }
+
+        public static object Value(this string input, Type type)
+        {
+            try
+            {
+                return TypeDescriptor.GetConverter(type).ConvertFromString(input);
+            }
+            catch
+            {
+                return null;
+            }
+        }
+    }
+}