CODEWITHSUNDEEP
c#linqaggregatedynamic-linq
Anyname Donotcare
Anyname Donotcare

Reputation: 11393

How to get the Sum of specific property using dynamic query

How to use Sum in dynamic linq query.

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});

I want to get summation of ExcuseDuration for specific emp_num in the same month of the year.

something like 

var langExp2 = "YEAR(ExcuseDate) = @1 AND MONTH(ExcuseDate) = @2 AND emp_num = @3";
var query1 = li.AsQueryable().Where(langExp2, 2019,5,3333)

Now I want to get the sum of ExcuseDuration?

Upvotes: 0

Views: 603

Answers (1)

Stef Heyenrath
Stef Heyenrath

Reputation: 9820

Something like:

long result = (long) li.AsQueryable().Where("EmpNum = @0", 3333).Select("it.ExcuseDuration.Ticks").Sum();
var totalDuration = new TimeSpan(result);

Upvotes: 1

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