bug? not execute Custom Expression

[neozhu]

there is my code:

[enisn]

As I understand you say the breakpoint never be hit inside your custom attribute. Right?

Let me check it

[neozhu]

As I understand you say the breakpoint never be hit inside your custom attribute. Right?

Let me check it

yes, right

[enisn]

It should be working and tests are passed.
But can you try to pass it as a parameter of [CompareTo] attribute like the following:

[CompareTo(typeof([SearchProductsWithListViewAttribute), "ListView")]
public ProductListView ListView { get; set; }

[enisn]

Here my Test class:

public class CustomAttributesTests
{
    public enum MyEnum
    {
        ValueA, ValueB, ValueC, ValueD, ValueE,
    }

    public class MyEnumFilterAttribute : FilteringOptionsBaseAttribute
    {
        public static bool IsExecuted { get; set; }
        public override Expression BuildExpression(Expression expressionBody, PropertyInfo targetProperty, PropertyInfo filterProperty, object value)
        {
            IsExecuted = true;

            return expressionBody;
        }
    }

    public class FooFilter : FilterBase
    {
        [MyEnumFilter]
        public MyEnum Value { get; set; }
    }

    public class FooEntity
    {
        public MyEnum Value { get; set; }
    }

    [Theory, AutoMoqData(count: 64)]
    public void CustomMethodShouldBeCalled(List<FooEntity> entities)
    {
        var filter = new FooFilter();
        MyEnumFilterAttribute.IsExecuted = false;

        var query = entities.AsQueryable().ApplyFilter(filter);

        MyEnumFilterAttribute.IsExecuted.Should().BeTrue();
    }
}

As I get it, you don't have the property with the same name in your entity, so FilterBase ignores that property since there no matched property in the entity.
This is a tough situation, maybe there might be some changes required in the AutoFilterer. The library shouldn't assume that there is always matching properties in the entity.

[neozhu]

thank you for your information. Yes, It's working.

[CompareTo(typeof(SearchProductsWithListView), "Name")]
public ProductListView ListView { get; set; } = ProductListView.All;

The property name “Name” must be the same as the property name of the Entity Object.

Now I have a requirement that when the value of ProductListView is "My Products", I need to query records where CreatedBy equals the current user ID. I would like to pass the current user ID as a parameter. If I declare the property using [CompareTo(typeof(SearchProductsWithListView), "Name")], how can I pass the parameter?

[neozhu]

I want to use Dependency Injection with SearchProductsWithListView to pass the current user. but not working

services.AddScoped<SearchProductsWithListView>();

public enum ProductListView
{
    [Description("All")]
    All,
    [Description("My Products")]
    My,
    [Description("Created Toady")]
    CreatedToday,
    [Description("Created within the last 30 days")]
    Created30Days
}

public class SearchProductsWithListView : FilteringOptionsBaseAttribute
{
    private readonly ICurrentUserService _currentUserService;

    public SearchProductsWithListView(ICurrentUserService currentUserService)
    {
        _currentUserService = currentUserService;
    }
    public override Expression BuildExpression(Expression expressionBody, PropertyInfo targetProperty, PropertyInfo filterProperty, object value)
    {
        var today = DateTime.Now.Date;
        var start = Convert.ToDateTime(today.ToString("yyyy-MM-dd", CultureInfo.CurrentCulture) + " 00:00:00", CultureInfo.CurrentCulture);
        var end = Convert.ToDateTime(today.ToString("yyyy-MM-dd", CultureInfo.CurrentCulture) + " 23:59:59", CultureInfo.CurrentCulture);
        var end30 = Convert.ToDateTime(today.AddDays(30).ToString("yyyy-MM-dd", CultureInfo.CurrentCulture) + " 23:59:59", CultureInfo.CurrentCulture);
        var userId = _currentUserService.UserId;
        var listview = (ProductListView)value;
        return listview switch
        {
            ProductListView.All => expressionBody,
           ProductListView.My=>  Expression.Equal(Expression.Property(expressionBody, "CreatedBy"),  Expression.Constant(userId)),
            ProductListView.CreatedToday => Expression.GreaterThanOrEqual(Expression.Property(expressionBody, "Created"),
                                                                          Expression.Constant(start, typeof(DateTime?)))
                                            .Combine(Expression.LessThanOrEqual(Expression.Property(expressionBody, "Created"),
                                                     Expression.Constant(end, typeof(DateTime?))),
                                                     CombineType.And),
            ProductListView.Created30Days => Expression.GreaterThanOrEqual(Expression.Property(expressionBody, "Created"),
                                             Expression.Constant(start, typeof(DateTime?)))
                                             .Combine(Expression.LessThanOrEqual(Expression.Property(expressionBody, "Created"),
                                                     Expression.Constant(end30, typeof(DateTime?))),
                                                     CombineType.And),
            _ => expressionBody
        };
    }
}

[enisn]

I want to use Dependency Injection with SearchProductsWithListView to pass the current user. but not working

Unfortunately, it's just a C# attribute and it doesn't support dependency injection. I have a plan for dependency injection compatibility ( #52 ) But I see there is a performance gap between regular one that uses DI.

This kind of dynamic parameters are not the main focus of AutoFilterer at the moment. But after #52 is implemented, it'll be quite possible to filter.

[neozhu]

thank you for your information,
You know IActionFilter support DI inject IHttpContextAccessor

[enisn]

Yeah, you're right, but AutoFilterer is an independent library and it doesn't have any reference to AspNetCore. Maybe an alternative attribute can be developed which extends IActionFilter