给设置界面添加数据库的配置

Config/ConnectionSettings.cs

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+using System;
+using System.IO;
+using Newtonsoft.Json;
+
+namespace PMSWPF.Config
+{
+    public class ConnectionSettings
+    {
+        public string DbType { get; set; } = "MySql";
+        public string Server { get; set; } = "127.0.0.1";
+        public int Port { get; set; } = 3306;
+        public string UserId { get; set; } = "root";
+        public string Password { get; set; } = "Pgw15221236646";
+        public string Database { get; set; } = "pmswpf";
+
+        private static readonly string SettingsFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "connectionSettings.json");
+
+        public static ConnectionSettings Load()
+        {
+            if (File.Exists(SettingsFilePath))
+            {
+                string json = File.ReadAllText(SettingsFilePath);
+                return JsonConvert.DeserializeObject<ConnectionSettings>(json);
+            }
+            return new ConnectionSettings(); // Return default settings if file doesn't exist
+        }
+
+        public void Save()
+        {
+            string json = JsonConvert.SerializeObject(this, Formatting.Indented);
+            File.WriteAllText(SettingsFilePath, json);
+        }
+
+        public string ToConnectionString()
+        {
+            // This example is for MySQL. You'll need to adjust for other database types.
+            return $"server={Server};port={Port};user={UserId};password={Password};database={Database};";
+        }
+    }
+}