From 9e1ac9f9e27c49e8a977f96f797907c945f9d8c2 Mon Sep 17 00:00:00 2001
From: Shuai Zhang <zhangshuai.ustc@gmail.com>
Date: Tue, 17 Dec 2019 17:31:33 +0800
Subject: [PATCH] Bugfix in ExportViewModel.

---
 .../ViewModels/DeviceMetricHistoryExportViewModel.cs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/GeothermalResearchInstitute/GeothermalResearchInstitute.Wpf/ViewModels/DeviceMetricHistoryExportViewModel.cs b/GeothermalResearchInstitute/GeothermalResearchInstitute.Wpf/ViewModels/DeviceMetricHistoryExportViewModel.cs
index ee10abc8..d9c80741 100644
--- a/GeothermalResearchInstitute/GeothermalResearchInstitute.Wpf/ViewModels/DeviceMetricHistoryExportViewModel.cs
+++ b/GeothermalResearchInstitute/GeothermalResearchInstitute.Wpf/ViewModels/DeviceMetricHistoryExportViewModel.cs
@@ -61,13 +61,21 @@ public ViewModelContext ViewModelContext
         public DateTime StartDateTime
         {
             get => this.startDateTime;
-            set => this.SetProperty(ref this.startDateTime, value);
+            set
+            {
+                this.SetProperty(ref this.startDateTime, value);
+                this.ExportCommand.RaiseCanExecuteChanged();
+            }
         }
 
         public DateTime EndDateTime
         {
             get => this.endDateTime;
-            set => this.SetProperty(ref this.endDateTime, value);
+            set
+            {
+                this.SetProperty(ref this.endDateTime, value);
+                this.ExportCommand.RaiseCanExecuteChanged();
+            }
         }
 
         public TimeSpan SelectedTimeSpan