[英]How to set a connectionstring value in app.config file?
My sample app.config file is 我的示例app.config文件是
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="DBconn" connectionString="driver={MySQL ODBC 5.1 Driver};server=10.78.17.229;database=grocery;uid=root;pwd=admin;"/>
</connectionStrings>
</configuration>
I want to set connectionstring value from the c# code. 我想从C#代码设置connectionstring值。 I am not able to change the file content. 我无法更改文件内容。 Please help me. 请帮我。
App.cofig Code App.cofig代码
<?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# Code C#代码
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;
}
Not entirely sure this is the approach you should be taking but anyway this might work for you? 不能完全确定这是您应该采用的方法,但是无论如何这可能对您有用?
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
ConfigurationSectionCollection sections = config.Sections;
foreach (ConfigurationSection section in sections)
{
ConnectionStringsSection connSettings = section as ConnectionStringsSection;
if (connSettings != null)
{
connSettings.ConnectionStrings[0].ConnectionString = "....";
}
}
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