public static bool IsUserInItemRole(this SPListItem item, SPPrincipal user, int roleId)
{
SPPermissionInfo userEffectivePermissions = item.GetUserEffectivePermissionInfo(user.LoginName);
SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetById(roleId);
foreach (SPRoleAssignment roleAssignment in userEffectivePermissions.RoleAssignments)
{
if (roleAssignment.RoleDefinitionBindings.Contains(roleDefinition))
{
return(true);
}
}
return(false);
}