namespace Microsoft.Data.SqlClient { public abstract class SqlAuthenticationProvider { public virtual void BeforeLoad(SqlAuthenticationMethod authenticationMethod); public virtual void BeforeUnload(SqlAuthenticationMethod authenticationMethod); public abstract bool IsSupported(SqlAuthenticationMethod authenticationMethod); public abstract Task<SqlAuthenticationToken> AcquireTokenAsync(SqlAuthenticationParameters parameters); public static SqlAuthenticationProvider GetProvider(SqlAuthenticationMethod authenticationMethod); public static bool SetProvider(SqlAuthenticationMethod authenticationMethod, SqlAuthenticationProvider provider); protected SqlAuthenticationProvider(); } }