1. 向项目添加app.config文件:
右击项目名称,选择“添加”→“添加新建项”,在出现的“添加新项”对话框中,选择“添加应用程序配置文件”;如果项目以前没有配置文件,则默认的文件名称为“app.config”,单击“确定”。出现在设计器视图中的app.config文件为:
- <?xmlversion="1.0"encoding="utf-8" ?>
- <configuration>
- </configuration>
在项目进行编译后,在bin\Debuge文件下,将出现两个配置文件(以本项目为例),一个名为“JxcManagement.EXE.config”,另一个名为“JxcManagement.vshost.exe.config”。第一个文件为项目实际使用的配置文件,在程序运行中所做的更改都将被保存于此;第二个文件为原代码“app.config”的同步文件,在程序运行中不会发生更改。
2. connectionStrings配置节:
请注意:如果您的SQL版本为2005 Express版,则默认安装时SQL服务器实例名为localhost\SQLExpress,须更改以下实例中“Data Source=localhost;”一句为“Data Source=localhost\SQLExpress;”,在等于号的两边不要加上空格。
- <!--数据库连接串-->
- <connectionStrings>
- <clear />
- <addname="conJxcBook"
- connectionString="Data Source=localhost;Initial Catalog=jxcbook;User ID=sa;password=********"
- providerName="System.Data.SqlClient" />
- </connectionStrings>
3. appSettings配置节:
appSettings配置节为整个程序的配置,如果是对当前用户的配置,请使用userSettings配置节,其格式与以下配置书写要求一样。
- <!--进销存管理系统初始化需要的参数-->
- <appSettings>
- <clear />
- <add key="userName" value="" />
- <add key="password" value="" />
- <add key="Department" value="" />
- <add key="returnValue" value="" />
- <add key="pwdPattern" value="" />
- <add key="userPattern" value="" />
- </appSettings>
4.读取与更新app.config
对于app.config文件的读写,参照了网络文章:http://www.codeproject.com/csharp/ SystemConfiguration.asp标题为“Read/Write App.Config File with .NET 2.0”一文。
请注意:要使用以下的代码访问app.config文件,除添加引用System.Configuration外,还必须在项目添加对System.Configuration.dll的引用。
4.1 读取connectionStrings配置节
- ///<summary>
- ///依据连接串名字connectionName返回数据连接字符串
- ///</summary>
- ///<param name="connectionName"></param>
- ///<returns></returns>
- private static string GetConnectionStringsConfig(string connectionName)
- {
- string connectionString =
- ConfigurationManager.ConnectionStrings[connectionName].ConnectionString.ToString();
- Console.WriteLine(connectionString);
- return connectionString;
- }
4.2 更新connectionStrings配置节
- ///<summary>
- ///更新连接字符串
- ///</summary>
- ///<param name="newName">连接字符串名称</param>
- ///<param name="newConString">连接字符串内容</param>
- ///<param name="newProviderName">数据提供程序名称</param>
- private static void UpdateConnectionStringsConfig(string newName,
- string newConString,
- string newProviderName)
- {
- bool isModified = false; //记录该连接串是否已经存在
- //如果要更改的连接串已经存在
- if (ConfigurationManager.ConnectionStrings[newName] != null)
- {
- isModified = true;
- }
- //新建一个连接字符串实例
- ConnectionStringSettings mySettings =
- new ConnectionStringSettings(newName, newConString, newProviderName);
- // 打开可执行的配置文件*.exe.config
- Configuration config =
- ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
- // 如果连接串已存在,首先删除它
- if (isModified)
- {
- config.ConnectionStrings.ConnectionStrings.Remove(newName);
- }
- // 将新的连接串添加到配置文件中.
- config.ConnectionStrings.ConnectionStrings.Add(mySettings);
- // 保存对配置文件所作的更改
- config.Save(ConfigurationSaveMode.Modified);
- // 强制重新载入配置文件的ConnectionStrings配置节
- ConfigurationManager.RefreshSection("ConnectionStrings");
- }
4.3 读取appStrings配置节
- ///<summary>
- ///返回*.exe.config文件中appSettings配置节的value项
- ///</summary>
- ///<param name="strKey"></param>
- ///<returns></returns>
- private static string GetAppConfig(string strKey)
- {
- foreach (string key in ConfigurationManager.AppSettings)
- {
- if (key == strKey)
- {
- return ConfigurationManager.AppSettings[strKey];
- }
- }
- return null;
- }
4.4 更新connectionStrings配置节
- ///<summary>
- ///在*.exe.config文件中appSettings配置节增加一对键、值对
- ///</summary>
- ///<param name="newKey"></param>
- ///<param name="newValue"></param>
- private static void UpdateAppConfig(string newKey, string newValue)
- {
- bool isModified = false;
- foreach (string key in ConfigurationManager.AppSettings)
- {
- if(key==newKey)
- {
- isModified = true;
- }
- }
- // Open App.Config of executable
- Configuration config =
- ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
- // You need to remove the old settings object before you can replace it
- if (isModified)
- {
- config.AppSettings.Settings.Remove(newKey);
- }
- // Add an Application Setting.
- config.AppSettings.Settings.Add(newKey,newValue);
- // Save the changes in App.config file.
- config.Save(ConfigurationSaveMode.Modified);
- // Force a reload of a changed section.
- ConfigurationManager.RefreshSection("appSettings");
- }
-
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多层次configSections
源地址
http://gb2013.blog.163.com/blog/static/21735301201021253713453/
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="student" type="System.Configuration.DictionarySectionHandler"/>
</configSections>
<student>
<add key="name" value="http://www.cnblogs.com/i80386/archive/2011/10/27/amily"/>
<add key="age" value="http://www.cnblogs.com/i80386/archive/2011/10/27/15"/>
<add key="sex" value="http://www.cnblogs.com/i80386/archive/2011/10/27/female"/>
</student>
</configuration>注意事项:configSections 相当于定义变量,必须放在configuration
IDictionary istudent = (IDictionary)ConfigurationManager.GetSection("student");
string[] keys=new string[istudent.Keys.Count];
string[] values = new string[istudent.Keys.Count];istudent.Keys.CopyTo(keys,0);
istudent.Values.CopyTo(values, 0);foreach (var key in keys)
{
Console.WriteLine(key);
}
foreach (var value in values)
{
Console.WriteLine(value);
}foreach (var key in istudent.Keys)
{
Console.WriteLine("{0}:{1}", key, istudent[key]);
}