App Config 配置文件的读写操作
若需要修改则可以打开配置文件，操作节点属性。App.config 配置文件是项目自带的xml文件, 可以使用 .net自带的类ConfigurationManager去访问，但首先需要引入System.Configuration 类库。在该配置文件中，常用的配置节点有3种：
1. 数据库连接字符串节点 connectionStrings
<connectionStrings>
<add name="HolipERP" connectionString="Server=cnhay01as02;User ID=hlpsfs;Password=8nasalt;Database=sfsData;" providerName="SQLOLEDB.1"/>
<add name="TestData" connectionString="Server=cnhay01as01;User ID=production;Password=holipserver;Database=Test_Memo_Data;" providerName="SQLOLEDB.1" />
</connectionStrings>
可用 ConfigurationManager.ConnectionStrings[name].ToString() 读取connectionString属性 ，好像找不到直接修改的方法，我是采用先删除再添加的方式修改的，其实一般也不会在程序里面动态修改这个配置字节。
2. 系统参数配置 AppSettings
<appSettings>
<add key="PLC_IP" value="192.168.0.11" />
</appSettings>
这种配置是以键值对的方式存在的，可用 ConfigurationManager.AppSettings[key].ToString() 读取 value 值， 若需要修改则可以打开配置文件，操作节点属性。
Configuration appConfig = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); //打开 vshost.exe.config appConfig.AppSettings.Settings.Add(key, value); appConfig.AppSettings.Settings.Remove(key); appConfig.AppSettings.Settings[key].Value = value;
3. 自定义配置 configSections
常用的有3种类型: System.Configuration.SingleTagSectionHandler （属性值的方式）
System.Configuration.DictionarySectionHandler （键值对的方式）
System.Configuration. NameValueSectionHandler （键值对的方式）
可以加上分组标签，另外有点很重要，configSections配置节必须放在开头即configuration的第一个子元素，具体配置格式如下，
<?xml version="1.0" encoding="utf-8" ?> <configuration> <configSections> <sectionGroup name="PLCData"> <section name="serialNum" type="System.Configuration.SingleTagSectionHandler"/> <section name="enableAssemble" type="System.Configuration.SingleTagSectionHandler"/> </sectionGroup> <section name="example1" type="System.Configuration.NameValueSectionHandler "/> </configSections> <PLCData> <serialNum DB="2" StartAddr="0" ByteLength="18" /> <enableAssemble DB="2" StartAddr="18" ByteLength="2" /> </PLCData> <example1> <add key="Hello" value="World" /> <add key="Good" value="Morning" /> </example1> <startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" /> </startup> <connectionStrings> <add name="HolipERP" connectionString="Server=cnhay01as02;User ID=hlpsfs;Password=8nasalt;Database=sfsData;" providerName="SQLOLEDB.1"/> <add name="TestData" connectionString="Server=cnhay01as01;User ID=production;Password=holipserver;Database=Test_Memo_Data;" providerName="SQLOLEDB.1" /> </connectionStrings> <appSettings> <add key="PLC_IP" value="192.168.0.11" /> </appSettings> </configuration>
可通过 IDictionary IDic = (IDictionary)ConfigurationManager.GetSection(setionGroupName+"/"+setionName) 读取配置，以键值对的方式保存。若需要修改，可采用xPath方式直接访问。下面这个AppConfigManagement静态类，当中的修改方法都是同时更新保存两个配置文件的，原因注释里有写到。
/// <summary> /// winform会自动生成有2个配置文件 vshost.exe.config 和 exe.config， 修改操作必须同时修改2个文件并同时保存， 如果只修改vshost.exe.config，程序重启会重新读取exe.config将其覆盖 /// </summary> public static class AppConfigManagement { private static Configuration appConfig = null; // vshost.exe.config private static Configuration appConfig_original = null; // exe.config private static XmlDocument doc = null; //加载 vshost.exe.config static AppConfigManagement() { appConfig = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); //打开 vshost.exe.config appConfig_original = ConfigurationManager.OpenExeConfiguration(Assembly.GetEntryAssembly().Location); //打开 exe.config doc = new XmlDocument(); //加载 vshost.exe.config doc.Load(appConfig.FilePath); } //读取连接字符串 public static string GetConnectionStringSet(string name) { try { return ConfigurationManager.ConnectionStrings[name].ToString(); }catch(Exception err){ throw new Exception("GetConnectionStringSet:" + err.Message); } } //修改连接字符串 public static void SetConnectionStringSet(string name,string value) { try { appConfig.ConnectionStrings.ConnectionStrings.Remove(name); //没有直接修改的方法，只能先删除，再创建 vshost.exe.config appConfig_original.ConnectionStrings.ConnectionStrings.Remove(name); // .exe.config appConfig.ConnectionStrings.ConnectionStrings.Add(new ConnectionStringSettings(name, value)); //添加vshost.exe.config appConfig_original.ConnectionStrings.ConnectionStrings.Add(new ConnectionStringSettings(name, value)); //添加exe.config appConfig.Save(); //保存vshost.exe.config appConfig_original.Save(); //保存exe.config ConfigurationManager.RefreshSection("connectionStrings"); //刷新内存中的配置值 if (!(GetConnectionStringSet(name) == value)) { //读取比较确认修改成功 throw new Exception("Failed to SetConnectionStringSet"); } } catch (Exception err) { throw new Exception("SetConnectionStringSet:" + err.Message); } } //读取程序配置 public static string GetAppSeting(string name) { try { return ConfigurationManager.AppSettings[name].ToString(); } catch (Exception err) { throw new Exception("GetAppSeting:" + err.Message); } } //添加程序配置 public static void AddAppSeting(string key,string value) { try { appConfig.AppSettings.Settings.Add(key, value); appConfig_original.AppSettings.Settings.Add(key, value); appConfig.Save(); //保存 appConfig_original.Save(); //保存 ConfigurationManager.RefreshSection("appSettings"); if (!(GetAppSeting(key) == value)) { //读取比较确认添加成功 throw new Exception("Failed to AddAppSeting"); } } catch (Exception err) { throw new Exception("AddAppSeting:" + err.Message); } } //删除程序配置 public static void DeleteAppSeting(string key) { try { appConfig.AppSettings.Settings.Remove(key); appConfig_original.AppSettings.Settings.Remove(key); appConfig.Save(); //保存 appConfig_original.Save(); //保存 ConfigurationManager.RefreshSection("appSettings"); } catch (Exception err) { throw new Exception("DeleteAppSeting:" + err.Message); } } //修改程序配置 public static void UpdateAppSeting(string key,string value) { try { appConfig.AppSettings.Settings[key].Value = value; appConfig_original.AppSettings.Settings[key].Value = value; appConfig.Save(); //保存 appConfig_original.Save(); //保存 ConfigurationManager.RefreshSection("appSettings"); if (!(GetAppSeting(key) == value)) { //读取比较确认添加成功 throw new Exception("Failed to UpdateAppSeting"); } } catch (Exception err) { throw new Exception("UpdateAppSeting:" + err.Message); } } //读取自定义配置节 //读取System.Configuration.SingleTagSectionHandler类型,System.Configuration.NameValueSectionHandler类型和System.Configuration.DictionarySectionHandler类型自定义配置节 public static Dictionary<string, string> GetCustomizedSection(string setionName) { try { IDictionary IDic = (IDictionary)ConfigurationManager.GetSection(setionName); Dictionary<string,string> Dic_Copy = new Dictionary<string,string>(); foreach(object key in IDic.Keys){ Dic_Copy.Add(key.ToString(),IDic[key].ToString()); } return Dic_Copy; } catch (Exception err) { throw new Exception("GetCustomizedSection:" + err.Message); } } //读取分组的System.Configuration.SingleTagSectionHandler类型,System.Configuration.NameValueSectionHandler类型和System.Configuration.DictionarySectionHandler类型自定义配置节 public static Dictionary<string, string> GetCustomizedSection(string setionGroupName,string setionName) { try { IDictionary IDic = (IDictionary)ConfigurationManager.GetSection(setionGroupName+"/"+setionName); Dictionary<string, string> Dic_Copy = new Dictionary<string, string>(); foreach (object key in IDic.Keys) { Dic_Copy.Add(key.ToString(), IDic[key].ToString()); } return Dic_Copy; } catch (Exception err) { throw new Exception("GetCustomizedSection:" + err.Message); } } //修改System.Configuration.SingleTagSectionHandler类型自定义配置节 public static void SetCustomizedSectionProperty(string setionGroup,string setionName, string propertyName, string value) { try { string xpath = ""; if (string.IsNullOrEmpty(setionGroup)) //是否有组 { xpath = setionName; } else { xpath = setionGroup + "/" + setionName; } XmlNode node = doc.SelectSingleNode(@"/configuration/"+xpath); //使用xPath的方式直接访问 node.Attributes[propertyName].Value = value; //设置属性值 doc.Save(appConfig.FilePath); //保存至 vshost.exe.config doc.Save(appConfig_original.FilePath); //保存至 exe.config ConfigurationManager.RefreshSection(xpath); //刷新内存中的配置值 } catch (Exception err) { throw new Exception("SetSingleTagSectionValue:" + err.Message); } } }
