[ASP.NET][C#]app.config與web.config的增加、修改、刪除操作
應用程式組態檔，對於asp.net是web.config，對於WindowsForm程式則是App.config(執行檔名稱.exe.config)。組態檔對於程式本身來說，就是基礎和依據，其本質是一個xml檔案，對於組態檔的操作，從.net2.0開始就方常的方便了，提供了System.Web.Configuration與System.Configuration兩個命名空間，要使用它，需要加入參考。
在WindowsForm中使用System.Configuration.ConfigurationManager
在ASP.NET中使用System.Web.Configuration.WebConfigurationManager
對於組態檔內容的讀取，實在是太方便了XD。
實作：
加入組態檔
以一小段App.config的內容來實作：
組態檔的內容如下：
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"This is A value" key="A"> |
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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)
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//Configuration與AppSettingsSection必須引用System.Configuration才可使用！ |
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Configuration config = WebConfigurationManager.OpenWebConfiguration(null); |
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AppSettingsSection app = config.AppSettings; |
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app.Settings.Add("B", "This is B value"); |
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config.Save(ConfigurationSaveMode.Modified); |
WinForm
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//Configuration與AppSettingsSection必須引用System.Configuration才可使用！ |
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Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); |
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AppSettingsSection app = config.AppSettings; |
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app.Settings.Add("B", "This is B value"); |
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config.Save(ConfigurationSaveMode.Modified); |
3.修改
ASP.NET(需要有寫入權限)
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//Configuration與AppSettingsSection必須引用System.Configuration才可使用！ |
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Configuration config = WebConfigurationManager.OpenWebConfiguration(null); |
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AppSettingsSection app = config.AppSettings; |
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//app.Settings.Add("B", "This is B value"); |
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app.Settings["A"].Value = "This is not B"; |
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config.Save(ConfigurationSaveMode.Modified); |
WinForm
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//Configuration與AppSettingsSection必須引用System.Configuration才可使用！ |
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Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); |
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AppSettingsSection app = config.AppSettings; |
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//app.Settings.Add("B", "This is B value"); |
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app.Settings["A"].Value = "This is not B"; |
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config.Save(ConfigurationSaveMode.Modified); |
4.刪除
ASP.NET(需要有寫入權限)
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//Configuration與AppSettingsSection必須引用System.Configuration才可使用！ |
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Configuration config = WebConfigurationManager.OpenWebConfiguration(null); |
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AppSettingsSection app = config.AppSettings; |
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//app.Settings.Add("B", "This is B value"); |
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//app.Settings["A"].Value = "This is not B"; |
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app.Settings.Remove("A"); |
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config.Save(ConfigurationSaveMode.Modified); |
WinForm
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//Configuration與AppSettingsSection必須引用System.Configuration才可使用！ |
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Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); |
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AppSettingsSection app = config.AppSettings; |
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//app.Settings.Add("B", "This is B value"); |
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//app.Settings["A"].Value = "This is not B"; |
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app.Settings.Remove("A"); |
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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：
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"connDB" providername="System.Data.OleDb" connectionstring="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\soft.mdb;Persist Security Info=True"> |
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"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\soft.mdb;Persist Security Info=True" key="connDB2"> |
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讀取：
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ConfigurationManager.ConnectionStrings["connDB"].ConnectionString; |
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//讀取name為connDB的連線字串 |
