Simple filter for .net WebApi that enables your endpoint to query your requests by url.

It provides ways to query, order and page your webapi.

Further features like select will be updated soon.

First, download the package into your webapi project from nuget (https://www.nuget.org/packages/Graphql.DynamicFilter)

nuget install Graphql.DynamicFilter

After downloaded, go to your webapi and create an get endpoint receiving DynamicFilter<TClass> as parameter.

[HttpGet]
public Task<List<User>> Get(DynamicFilter<User> filter)

Now you can query your endpoint with the TClass on DynamicFilter properties. Check "Tests" folder on the project for examples.

DynamicFilter will transform your URI Queries into .Net Expressions. That way, you can use these expressions to filter your values into your database repository.

List<User> users = new List<User>()
{
    new User("Bruno", 27),
    new User("Fred", 33),
    new User("Albert", 37),
    new User("Lucao", 23),
    new User("Luide", 28)
};

[HttpGet]
public Task<List<User>> Get(DynamicFilter<User> filter)
{
    var result = this.users.Where(filter.Filter.Compile());

    return Task.FromResult(result.ToList());
}

• Simple Query

Example Uri:

GET http://url?query=name=Bruno

Expression generated by Uri:

x => x.Name == "Bruno"

• Complex Query

Example Uri:

GET http://url?query=name=Bruno,lastname%r,age>=27

Expression generated by Uri:

x => x.Name == "Bruno" 
  && x.LastName.ToLower().Contains("r") 
  && x.Age >= 27

You can add conditions to your query sorting your filters with a comma (,), as shown above.

• Nested Query

Example Uri:

GET http://url?query=address.number=23

Expression generated by Uri:

x => x.Address.Number == 23

You can also order your queries via DynamicFilter. You simply need to add an order parameter on your query, where you specify the property you'll use for order.

GET http://url?query=name=Bruno&order=name

Default order type is Ascending. You can specify the order type with an equals (=) Asc or Desc after the property.

GET http://url?query=name=Bruno&order=name=Asc

GET http://url?query=name=Bruno&order=name=Desc

On your DynamicFilter object received on the endpoint, you'll get the orderType as an Enum, this way you can order by the type specified on enum.

public Task<List<User>> Get(DynamicFilter<User> filter)
{
    var result = this.users.Where(filter.Filter.Compile());

    if (filter.Order != null)
    {
        if (filter.OrderType == OrderType.Asc)
            result = result.OrderBy(filter.Order.Compile());
        else
            result = result.OrderByDescending(filter.Order.Compile());
    }

    return Task.FromResult(result.ToList());
}

To page, you simply needs to add the parameters page and pagesize on your get request.

GET http://url?query=name%b&order=name&page=1&pagesize=10

result = result.Skip(filter.Page).Take(filter.PageSize);

To select, you simply needs to add the parameter select with the properties you want to select from. It will render either an linq select and a plain string select.

GET http://url?select=name,age

• Equals (=)

GET http://url?query=name=Bruno

• Contains (%)

GET http://url?query=name%b

• Contains Case Sensitive (%%)

GET http://url?query=name%%B

• GreaterThan (>)

GET http://url?query=age>15

• GreaterOrEqual (>=)

GET http://url?query=age>=15

• LessThan (<)

GET http://url?query=age<15

• LessOrEqual (<=)

GET http://url?query=age<=15

• NotEquals (!=)

GET http://url?query=age!=15