更新在C＃

Question

運行時間在app.config文件的connectionString我已經創建了一個應用程序，該應用程序中我要插入，更新和數據庫

我也創建了連接設置的形式刪除數據的操作，用戶可以在其中更新服務器名稱，數據庫和用戶標識和密碼。我已將連接字符串存儲在app.config文件中。

我的問題是，如何在運行時更新app.config文件中的連接字符串？

Answer 1

你可以試試這個：

private void changeValue(String KeyName, String KeyValue) 
{ 
System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 

// Update the setting. 
config.AppSettings.Settings[KeyName].Value = KeyValue; 

// Save the configuration file. 
config.Save(ConfigurationSaveMode.Modified); 

// Force a reload of the changed section. 
ConfigurationManager.RefreshSection("appSettings"); 
} 

Answer 2

你可以試試這個：

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
config.ConnectionStrings.ConnectionStrings.Add(new ConnectionStringSettings("MyConnectionString",String.Format("DataSource={0};InitialCatalog={1};IntegratedSecurity={2}","testing", "testing2", "Testing6"))); 
config.Save(ConfigurationSaveMode.Modified, true); 
ConfigurationManager.RefreshSection("connectionStrings"); 

Answer 3

我相信，因爲它使用的是vshost您的App.Config中沒有更新。今天我遇到了這個問題，我嘗試了這篇文章的解決方案，但在VisualStudio上運行，所以文件是一樣的。在VS之外，它起到了魅力的作用。

Answer 4

App.cofig代碼

 <?xml version="1.0" encoding="utf-8"?> 
     <configuration> 
    <configSections> 
      <section name="dataConfiguration"type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=3.1.0.0, Culture=neutral,  PublicKeyToken=b03f5f7f11d50a3a" /> 
    </configSections> 
    <connectionStrings> 
    <add name="DbDatabase" providerName="System.Data.SqlClient" connectionString=""/> 
</connectionStrings> 

C＃代碼

public void updateConfigFile(string con) 
    { 
     //updating config file 
     XmlDocument XmlDoc = new XmlDocument(); 
     //Loading the Config file 
     XmlDoc.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile); 
     // XmlDoc.Load("App.config"); 
     foreach (XmlElement xElement in XmlDoc.DocumentElement) 
     { 
      if (xElement.Name == "connectionStrings") 
      { 
       //setting the coonection string 
       xElement.FirstChild.Attributes[2].Value = con; 
      } 
     } 
     //writing the connection string in config file 
     XmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile); 
     //XmlDoc.Save("App.config"); 
    } 



private void btn_Connect_Click(object sender, EventArgs e) 
    { 
     StringBuilder Con = new StringBuilder("Data Source="); 
     Con.Append(txt_ServerName.Text); 
     Con.Append(";Initial Catalog="); 
     Con.Append(txt_DatabaseName.Text); 
     if (String.IsNullOrEmpty(txt_UserId.Text) &&String.IsNullOrEmpty(txt_Password.Text)) 
      Con.Append(";Integrated Security=true;"); 
     else 
     { 
      Con.Append(";User Id="); 
      Con.Append(txt_UserId.Text); 
      Con.Append(";Password="); 
      Con.Append(txt_Password.Text); 
     } 
     string strCon = Con.ToString(); 
     updateConfigFile(strCon); 

     DatabaseTableDA da = new DatabaseTableDA(); 
     tableList = da.Select_Tables(); 
     this.lstTables.DataSource = tableList; 
    } 

Answer 5

var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
var connectionStringsSection = (ConnectionStringsSection)config.GetSection("connectionStrings"); 
connectionStringsSection.ConnectionStrings["ClientCN"].ConnectionString = "server=localhost;user=root;port=3306;password=abc"; 
config.Save(); 
    ConfigurationManager.RefreshSection("connectionStrings"); 

Answer 6

試試這個：

var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
var connectionStringsSection = (ConnectionStringsSection)config.GetSection("connectionStrings"); 
connectionStringsSection.ConnectionStrings["ClientCN"].ConnectionString = "server=localhost;user=root;port=3306;password=abc"; 
config.Save(); 
ConfigurationManager.RefreshSection("connectionStrings");