VB.NET示例app.config访问

Question

任何人都可以提供示例代码，展示如何将app.config文件与用VB.NET编写的应用程序集成。具体而言，我需要从app.config文件中提取数据库连接字符串。

Answer 1

参见：

Public Shared Function GetConnectionString(ByVal strConnection As String) As String 
    'Declare a string to hold the connection string 
    Dim sReturn As New String("") 
    'Check to see if they provided a connection string name 
    If Not String.IsNullOrEmpty(strConnection) Then 
     'Retrieve the connection string fromt he app.config 
     sReturn = ConfigurationManager. & _ 
     ConnectionStrings(strConnection).ConnectionString 
    Else 
     'Since they didnt provide the name of the connection string 
     'just grab the default on from app.config 
     sReturn = ConfigurationManager. & _ 
     ConnectionStrings("YourConnectionString").ConnectionString 
    End If 
    'Return the connection string to the calling method 
    Return sReturn 
End Function