/// <summary>
/// 将指定的用户赋予特定的角色。
/// </summary>
/// <param name="user">用户实体。</param>
/// <param name="role">角色实体。</param>
/// <returns>用以表述用户及其角色之间关系的实体。</returns>
public UserRole AssignRole(User user, Role role)
{
if (user == null)
throw new ArgumentNullException("user");
if (role == null)
throw new ArgumentNullException("role");
UserRole userRole = _userRoleRepository.Find(Specification<UserRole>.Eval(ur => ur.UserID == user.ID));
if (userRole == null)
{
userRole = new UserRole(user.ID, role.ID);
_userRoleRepository.Add(userRole);
}
else
{
userRole.RoleID = role.ID;
_userRoleRepository.Update(userRole);
}
_repositoryContext.Commit();
return userRole;
}
/// <summary>
/// 将指定的用户从角色中移除。
/// </summary>
/// <param name="user">用户实体。</param>
/// <param name="role">角色实体，若为NULL，则表示从所有角色中移除。</param>
public void UnassignRole(User user, Role role = null)
{
if (user == null)
throw new ArgumentNullException("user");
Expression<Func<UserRole, bool>> specExpression;
if (role == null)
// ReSharper disable ImplicitlyCapturedClosure
specExpression = ur => ur.UserID == user.ID;
// ReSharper restore ImplicitlyCapturedClosure
else
specExpression = ur => ur.UserID == user.ID && ur.RoleID == role.ID;
var userRole = _userRoleRepository.Find(Specification<UserRole>.Eval(specExpression));
if (userRole == null) return;
_userRoleRepository.Remove(userRole);
_repositoryContext.Commit();
}
/// <summary>
/// 将指定的用户从角色中移除。
/// </summary>
/// <param name="user">用户实体。</param>
/// <param name="role">角色实体，若为NULL，则表示从所有角色中移除。</param>
public void UnassignRole(User user, Role role = null)
{
if (user == null)
throw new ArgumentNullException("user");
Expression<Func<UserRole, bool>> specExpression = null;
if (role == null)
specExpression = ur => ur.UserID == user.ID;
else
specExpression = ur => ur.UserID == user.ID && ur.RoleID == role.ID;
UserRole userRole = userRoleRepository.Find(Specification<UserRole>.Eval(specExpression));
if (userRole != null)
{
userRoleRepository.Remove(userRole);
repositoryContext.Commit();
}
}
