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

时间：2011-04-14 来源：Mainz

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);
}