增加系统预设渐变背景

Converts/StringAppendConvert.cs

@@ -0,0 +1,33 @@
+using GeekDesk.Constant;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace GeekDesk.Converts
+{
+    class StringAppendConvert : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value == null) return null;
+            if (parameter == null)
+            {
+                return value.ToString();
+            } else
+            {
+                string val = value.ToString();
+                string param = parameter.ToString();
+                return param.Replace("{}", val);
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}