添加项目文件。

TestingModule/Views/Dialogs/ParameterSetting.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace TestingModule.Views.Dialogs
+{
+    /// <summary>
+    /// ParameterSetting.xaml 的交互逻辑
+    /// </summary>
+    public partial class ParameterSetting : UserControl
+    {
+        public ParameterSetting()
+        {
+            InitializeComponent();
+        }
+
+        private void ComboBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+        {
+            if (sender is ComboBox comboBox && !comboBox.IsDropDownOpen)
+            {
+                comboBox.IsDropDownOpen = true;
+                e.Handled = true;
+            }
+        }
+    }
+}