修复重复添加或者导入变量的问题，添加显示导入结果对话框

Views/Dialogs/ImportResultDialog.xaml.cs

@@ -0,0 +1,20 @@
+using iNKORE.UI.WPF.Modern.Controls;
+using PMSWPF.ViewModels.Dialogs;
+
+namespace PMSWPF.Views.Dialogs;
+
+/// <summary>
+/// ImportResultDialog.xaml 的交互逻辑
+/// </summary>
+public partial class ImportResultDialog : ContentDialog
+{
+    public ImportResultDialog()
+    {
+        InitializeComponent();
+    }
+
+    public ImportResultDialog(ImportResultDialogViewModel viewModel) : this()
+    {
+        DataContext = viewModel;
+    }
+}