Activities of "TMuska"

I'm just trying to follow the example. Instead of IsActive/boolean, I'm trying to do CustomerNumber/string.

protected override Expression<Func<TEntity, bool>> CreateFilterExpression<TEntity>()
{
    var expression = base.CreateFilterExpression<TEntity>();

    if (typeof(IIsActive).IsAssignableFrom(typeof(TEntity)))
    {
        Expression<Func<TEntity, bool>> isActiveFilter =
            e => !IsActiveFilterEnabled || EF.Property<bool>(e, "IsActive");
        expression = expression == null 
            ? isActiveFilter 
            : QueryFilterExpressionHelper.CombineExpressions(expression, isActiveFilter);
    }

    return expression;
}