动态设置和修改Membership/Profile/RoleProvider的ConnectionString数据库连接字符串

一般使用Membership的人都知道，其ConnectionString数据库连接字符串是在web.config/app.config里面设置的，例如：

  
    

   
     <
   
     membership 
   
     defaultProvider
   
     ="SqlProvider"
   
      userIsOnlineTimeWindow
   
     ="15"
   
     >
   
     
 
   
     <
   
     providers
   
     >
   
     
 
   
     <
   
     clear 
   
     />
   
     
 
   
     <
   
     add 
   
     name
   
     ="SqlProvider"
   
      type
   
     ="System.Web.Security.SqlMembershipProvider"
   
      connectionStringName
   
     ="SqlServices"
   
      applicationName
   
     ="MyApplication"
   
      enablePasswordRetrieval
   
     ="false"
   
      enablePasswordReset
   
     ="true"
   
      requiresQuestionAndAnswer
   
     ="false"
   
      requiresUniqueEmail
   
     ="false"
   
      passwordFormat
   
     ="Hashed"
   
      minRequiredPasswordLength
   
     ="3"
   
      minRequiredNonalphanumericCharacters
   
     ="0"
   
      
   
     />
   
     
 
   
     </
   
     providers
   
     >
   
     

   
     </
   
     membership
   
     >
  
    

那么在程序中是否有可能根据不同的环境来动态指定MemberShip所用的数据库连接ConnectionString呢？

我想这个要求是很多人都会遇到的，其实很简单，几行代码就搞定了，也不需要扩展一个自定义的MembershipProvider，上代码：

  
    

   
     ///
   
      
   
     <summary>
   
     

   
     ///
   
      Sets the provider connection string.

   
     ///
   
      
   
     </summary>
   
     

   
     ///
   
      
   
     <param name="connectionString">
   
     The connection string.
   
     </param>
   
     

   
     private
   
      
   
     void
   
      SetProviderConnectionString(
   
     string
   
      connectionString)
{
 var connectionStringField 
   
     =
   
      Membership.Provider.GetType().GetField(
   
     "
   
     _sqlConnectionString
   
     "
   
     , BindingFlags.Instance 
   
     |
   
      BindingFlags.NonPublic);
 
   
     if
   
      (connectionStringField 
   
     !=
   
      
   
     null
   
     )
 connectionStringField.SetValue(Membership.Provider, connectionString);

 var roleField 
   
     =
   
      Roles.Provider.GetType().GetField(
   
     "
   
     _sqlConnectionString
   
     "
   
     , BindingFlags.Instance 
   
     |
   
      BindingFlags.NonPublic);
 
   
     if
   
      (roleField 
   
     !=
   
      
   
     null
   
     )
 roleField.SetValue(Roles.Provider, connectionString);

 var profileField 
   
     =
   
      ProfileManager.Provider.GetType().GetField(
   
     "
   
     _sqlConnectionString
   
     "
   
     , BindingFlags.Instance 
   
     |
   
      BindingFlags.NonPublic);
 
   
     if
   
      (profileField 
   
     !=
   
      
   
     null
   
     )
 profileField.SetValue(ProfileManager.Provider, connectionString);
}
  
    

代码用法：

当你在运行时需要切换Membership的数据库连接ConnectionString的时候，调用一下这个函数就会刷新到新的数据库了。很简单。

参考文献：Setting Membership/Profile/Role provider's connection string at runtime