CODEWITHSUNDEEP
c#linqdatetimedynamic-linqdynamic-linq-core
Anyname Donotcare
Anyname Donotcare

Reputation: 11393

How to filter by a part of the date dynamically

If I want to build a specific rule in dynamic query where part of the condition states that

the same month of the year

I have the following datasource :

List<Excuse> li = new List<Excuse>();
li.Add(new Excuse { EmpNum = 3333, ExcuseDate = DateTime.Today, ExcuseDuration = new TimeSpan(0, 30, 0), ExcuseType = 0, Id = 1 });
li.Add(new Excuse { EmpNum = 3333, ExcuseDate = DateTime.Today.AddDays(1), ExcuseDuration = new TimeSpan(2, 30, 0), ExcuseType = 0, Id = 2 });
li.Add(new Excuse { EmpNum = 3333, ExcuseDate = DateTime.Today.AddDays(2), ExcuseDuration = new TimeSpan(2, 0, 0), ExcuseType = 0, Id = 3 });
li.Add(new Excuse { EmpNum = 2345, ExcuseDate = DateTime.Now, ExcuseDuration = new TimeSpan(0, 30, 0), ExcuseType = 0, Id = 4});

How to write something like that :

var langExp = "YEAR(ExcuseDate) = @1 AND MONTH(ExcuseDate) = @2 AND emp_num = @3";
var query1 = li.AsQueryable().Where(langExp, 2019,5,3333);

I want methods like Year() or Month() or the equivalent method to do something like that.

Upvotes: 0

Views: 216

Answers (1)

NetMage
NetMage

Reputation: 26917

This should work easily with Dynamic LINQ:

var langExp = "ExcuseDate.Year = @0 && ExcuseDate.Month = @1 && EmpNum = @2";
var query1 = li.AsQueryable().Where(langExp, 2019, 5, 3333);

Upvotes: 2

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