score:11
Accepted answer
Your issue is not linq. Your issue is that EF does not know how to convert that statement (z.JoiningDate.AddMonths(x.Commitments.Value)) to SQL.
If you ToList() before the select it should work.
Else you should use
EntityFunctions.AddMonths(z.JoiningDate, x.Commitments.Value)
which EF can indeed convert to SQL
In other words
.Select(z => new BondCompletionViewModel
{
EmployeeId = z.EmployeeId.Value,
EmployeeName = z.Name,
StartDate = z.JoiningDate,
EndDate = EntityFunctions.AddMonths(z.JoiningDate, x.Commitments.Value)
}).ToList();
Edit: DbFunctions is the new EF 6 class to use instead of EntityFunctions
score:4
You can use EntityFunctions.AddMonths
This function is translated to a corresponding function in the database.
Usage
EntityFunctions.AddMonths(z.JoiningDate, x.Commitments.Value)
score:1
You can use SqlFunction Class:
.Where(x => SqlFunctions.DateAdd("month",x.Commitments.Value,x.JoiningDate).Month == ToDate.Value.Month)
Source: stackoverflow.com
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