How to filter a ICollection by multiple filters, even if some filters are 0

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Ok i have a ICollection<tasks> which i wish to filter and return filtered tasks.

i have many filters some dependant on others, works like this

If user selects CreatedBy, AssignedTo and UpdatedBy - a User filter is then required to be chosen

the user can also select the following filters:

Priority,TaskType, TaskStatus, Date,

at the moment the filter values are taken using Javascript and passed to my Controller into a ViewModel, which the filtering logic is done and the the filtered Collection Returned to view.

Now i need help building the filtering logic, what is the most concise way of filtering the collection, taking into account that some of the filters may not be selected and therefore ALL should be returned under that category.

Thanks

Posted 11-Dec-14 5:34am

Grant Weatherston

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DamithSL 11-Dec-14 11:54am

update the question with your method which you going to handle the filtering with your current code

Grant Weatherston 12-Dec-14 3:12am

i dont have any current code, this is why i have asked for the help as i don't know how to do it

3 solutions

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Andreas Gieriet · Answer 1 · 2014-12-11T11:45:00

Solution 1

You might be interested in Invent your own Dynamic LINQ parser[^].

Cheers
Andi

Posted 11-Dec-14 11:45am

Andreas Gieriet

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Maciej Los 14-Dec-14 12:55pm

+5

Andreas Gieriet 14-Dec-14 14:24pm

Thanks for your 5!
Cheers
Andi

Maciej Los · Answer 2 · 2014-12-14T07:03:00

Solution 2

I'd suggest to start with basics: How to: Query a Collection of Objects (C# Programming Guide)[^]. It's quite simple. Try! If you get stuck, then come back here and ask detailed question.

Tutorial: Asp.NET MVC3 And LinQ Based Sample Web Application[^]

Posted 14-Dec-14 7:03am

Maciej Los

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Andreas Gieriet 14-Dec-14 14:24pm

Good links! My 5!
Cheers
Andi

Maciej Los 14-Dec-14 14:46pm

Thank you, Andi ;)
[EDIT]
By The Way: I don't see your 5 ;(

Grant Weatherston · Answer 3 · 2014-12-15T00:32:00

i utilised Linq in the end using following code:

C#

var results = from t in db.IT_Tasks
                          where (

                                  ((model.UserFilterTypeID == 0) || (model.UserFilterTypeID == 1 && t.CreatedByID == model.UserID)
|| (model.UserFilterTypeID == 2 && t.AssignedUserID == model.UserID)|| (model.UserFilterTypeID == 3 && t.UpdatedByID == model.UserID))&& (model.TaskStatusID == 0 || t.TaskStatusID == model.TaskStatusID)&& (model.TaskTypeID == 0 || t.TaskTypeID == model.TaskTypeID)&& ((model.DateTypeID == 0)|| (model.DateTypeID == 1 && t.DateCreated >= model.DateFrom && t.DateCreated <=model.DateTo )|| (model.DateTypeID==2 && t.DateUpdated >= model.DateFrom && t.DateUpdated <= model.DateTo))
                           )
                          select t;

How to filter a ICollection by multiple filters, even if some filters are 0

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