ASP.NET C# app.config與web.config的增加、修改、刪除操作

from http://www.dotblogs.com.tw/box5068/archive/2011/02/21/21477.aspx

以一小段App.config的內容來實作：

組態檔的內容如下：

1	<!--?xml version="1.0" encoding="utf-8" ?-->

2	<configuration>

3	<appsettings>

4	<add key="A" value="This is A value">

5

</add>

6	</appsettings>

7	</configuration>

1.讀取值：

Asp.Net：System.Web.Configuration.WebConfigurationManager.AppSettings["A"];

WinForm：System.Configuration.ConfigurationManager.AppSettings["A"];  

2.增加

ASP.NET(需要有寫入權限)

1	//Configuration與AppSettingsSection必須引用System.Configuration才可使用！

2	Configuration config = WebConfigurationManager.OpenWebConfiguration(null);

3	AppSettingsSection app = config.AppSettings;

4	app.Settings.Add("B", "This is B value");

5	config.Save(ConfigurationSaveMode.Modified);

WinForm

1	//Configuration與AppSettingsSection必須引用System.Configuration才可使用！

2	Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

3	AppSettingsSection app = config.AppSettings;

4	app.Settings.Add("B", "This is B value");

5	config.Save(ConfigurationSaveMode.Modified);

3.修改

ASP.NET(需要有寫入權限)

1	//Configuration與AppSettingsSection必須引用System.Configuration才可使用！

2	Configuration config = WebConfigurationManager.OpenWebConfiguration(null);

3	AppSettingsSection app = config.AppSettings;

4	//app.Settings.Add("B", "This is B value");

5	app.Settings["A"].Value = "This is not B";

6	config.Save(ConfigurationSaveMode.Modified);

WinForm

1	//Configuration與AppSettingsSection必須引用System.Configuration才可使用！

2	Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

3	AppSettingsSection app = config.AppSettings;

4	//app.Settings.Add("B", "This is B value");

5	app.Settings["A"].Value = "This is not B";

6	config.Save(ConfigurationSaveMode.Modified);

4.刪除

ASP.NET(需要有寫入權限)

1	//Configuration與AppSettingsSection必須引用System.Configuration才可使用！

2	Configuration config = WebConfigurationManager.OpenWebConfiguration(null);

3	AppSettingsSection app = config.AppSettings;

4	//app.Settings.Add("B", "This is B value");

5	//app.Settings["A"].Value = "This is not B";

6	app.Settings.Remove("A");

7	config.Save(ConfigurationSaveMode.Modified);

WinForm

1	//Configuration與AppSettingsSection必須引用System.Configuration才可使用！

2	Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

3	AppSettingsSection app = config.AppSettings;

4	//app.Settings.Add("B", "This is B value");

5	//app.Settings["A"].Value = "This is not B";

6	app.Settings.Remove("A");

7	config.Save(ConfigurationSaveMode.Modified);

以上就是對組態檔的增加/修改/刪除

另外也可以將連線資料庫的連線字串寫在組態檔內方便修改

如下：

組態檔內容：

1	<configuration>

2	<connectionstrings>

3	<add connectionstring="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\soft.mdb;Persist Security Info=True" name="connDB" providername="System.Data.OleDb">

4	</add></connectionstrings>

5	<appsettings>

6	<add key="connDB2" value="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\soft.mdb;Persist Security Info=True">

7	</add></appsettings>

8	</configuration>

讀取：

1	ConfigurationManager.ConnectionStrings["connDB"].ConnectionString;

2	//讀取name為connDB的連線字串