添加项目文件。

GroupLine.Com/ConfigHelper.cs

@@ -0,0 +1,55 @@
+using System.Configuration;
+
+namespace GroupLine.Com
+{
+    public class ConfigHelper
+    {
+        Configuration cfa = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
+
+        /// <summary>
+        /// 根据Key取Value值
+        /// </summary>
+        /// <param name="key"></param>
+        public static string GetValue(string key)
+        {
+            return ConfigurationManager.AppSettings[key].ToString().Trim();
+        }
+
+        /// <summary>
+        /// 根据Key修改Value
+        /// </summary>
+        /// <param name="key">要修改的Key</param>
+        /// <param name="value">要修改为的值</param>
+        public static void SetValue(string key, string value)
+        {
+            //ConfigurationManager.AppSettings.Set(key, value);
+            //cfa.AppSettings.Settings[key].Value = value;
+            //cfa.Save();
+
+            Configuration configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
+            configuration.AppSettings.Settings[key].Value = value;
+            configuration.Save();
+            ConfigurationManager.RefreshSection("appSettings");
+        }
+
+        /// <summary>
+        /// 添加新的Key ，Value键值对
+        /// </summary>
+        /// <param name="key">Key</param>
+        /// <param name="value">Value</param>
+        public static void Add(string key, string value)
+        {
+            ConfigurationManager.AppSettings.Add(key, value);
+        }
+
+        /// <summary>
+        /// 根据Key删除项
+        /// </summary>
+        /// <param name="key">Key</param>
+        public static void Remove(string key)
+        {
+            ConfigurationManager.AppSettings.Remove(key);
+        }
+
+    }
+}