修复了添加设备的一些问题

Services/DeviceDialogService.cs

@@ -1,4 +1,5 @@
-using PMSWPF.Models;
+using iNKORE.UI.WPF.Modern.Controls;
+using PMSWPF.Models;
 using PMSWPF.ViewModels.Dialogs;
 using PMSWPF.Views.Dialogs;
 
@@ -6,15 +7,24 @@ namespace PMSWPF.Services;
 
 public class DeviceDialogService : IDeviceDialogService
 {
-    public async Task<Device> ShowAddDeviceDialog(Device device)
+    public async Task<Device> ShowAddDeviceDialog()
     {
+        Device device = new Device();
         DeviceDialogViewModel ddvm = new DeviceDialogViewModel(device)
         {
             Title = "添加设备"
         };
 
         DeviceDialog dialog = new DeviceDialog(ddvm);
-        await dialog.ShowAsync();
-        return device;
+        var res=await dialog.ShowAsync();
+        if (res == ContentDialogResult.Primary)
+        {
+            return device;
+        }
+        else
+        {
+            return null;
+        }
+
     }
 }