fix #41 优化待办任务

Converts/Count2VisibleConvert.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace GeekDesk.Converts
+{
+    public class Count2VisibleConvert : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value == null) return Visibility.Collapsed;
+            int count = (int)value;
+
+            if (parameter == null || "Y".Equals(parameter.ToString()))
+            {
+                if (count > 0)
+                {
+                    return Visibility.Visible;
+                }
+                else
+                {
+                    return Visibility.Collapsed;
+                }
+            } else
+            {
+                if (count <= 0)
+                {
+                    return Visibility.Visible;
+                }
+                else
+                {
+                    return Visibility.Collapsed;
+                }
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Converts/CountGreZero2BoolConvert.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace GeekDesk.Converts
+{
+    public class CountGreZero2BoolConvert : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value == null) return false;
+            int count = (int)value;
+            if (count > 0)
+            {
+                return true;
+            } else
+            {
+                return false;
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}