C#Winform读写config配置文件

一:使用ConfigurationManager
①:添加System.configguration

②:引用空间

③:config配置文件配置节
A:自定义配置

B:数据源配置

<addname="kyd"connectionString=“server=.;database=UFDATA_999_2017;user=sa;pwd=123”/>

</connectionStrings>

C:普通配置

　　

二:Config文件读写
1.依据连接串名返回字符串
A:界面

B:后台代码
private void button1_Click(object sender, EventArgs e)
{
//指定config文件读取
string file = System.Windows.Forms.Application.ExecutablePath;
System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(file);
string connectionString =
config.ConnectionStrings.ConnectionStrings[“sql1”].ConnectionString.ToString();
MessageBox.Show( connectionString);
}
2.更新连接字符串
A:界面

B:后台代码
private void button2_Click(object sender, EventArgs e)
{
///
///更新连接字符串
///
///连接字符串名称
///连接字符串内容
///数据提供程序名称
//指定config文件读取
string file = System.Windows.Forms.Application.ExecutablePath;
Configuration config = ConfigurationManager.OpenExeConfiguration(file);

            bool exist = 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 (config.ConnectionStrings.ConnectionStrings["sql1"] != null)
            {
                exist = true;
            }
            // 如果连接串已存在，首先删除它  
            if (exist)
            {
                config.ConnectionStrings.ConnectionStrings.Remove("sql1");
            }
            //新建一个连接字符串实例  
            ConnectionStringSettings mySettings =
                new ConnectionStringSettings("sql1", "Data","AA");
            // 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");
        }

3.exe.confing文件中的appSettings配置节的value
A:界面

B:后台代码
private void button3_Click(object sender, EventArgs e)
{
string file = System.Windows.Forms.Application.ExecutablePath;
Configuration config = ConfigurationManager.OpenExeConfiguration(file);
foreach (string key in config.AppSettings.Settings.AllKeys)
{
if (key == “key1”)
{
MessageBox.Show(config.AppSettings.Settings[“key1”].Value.ToString());
}
}
}
4.exe.confing文件中的appSettings配置节增加一对键值对
A:界面

B:后台代码
private void button4_Click(object sender, EventArgs e)
{
string file = System.Windows.Forms.Application.ExecutablePath;
Configuration config = ConfigurationManager.OpenExeConfiguration(file);
bool exist = false;
foreach (string key in config.AppSettings.Settings.AllKeys)
{
if (key == “key1”)
{
exist = true;
}
}
if (exist)
{
config.AppSettings.Settings.Remove(“key1”);
}
config.AppSettings.Settings.Add(“key1”, “5555”);
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection(“appSettings”);
}