locked
What is wrong with this query RRS feed

  • Question

  • User1632102518 posted

    string result = from emp in context.Employees

    where emp.EmployeeId == empId

    select emp.EmployeeName;

    return result;

    I am getting this error.

    "Cannot implicitlty convert Sytem.Linq.Iquerable<string> to string ".

    Thursday, April 9, 2015 6:57 PM

Answers

  • User2103319870 posted

    I am getting this error.

    "Cannot implicitlty convert Sytem.Linq.Iquerable<string> to string ".

    You need to use SingleorDefault() or FirstorDefault() at the end of query like given below

    string result = (from emp in context.Employees
    
    where emp.EmployeeId == empId
    
    select emp.EmployeeName).SingleOrDefault();
    
    return result;

    • Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM
    Thursday, April 9, 2015 8:12 PM
  • User61956409 posted

    Hi sreeja1234,

    Thanks for your post.

    from emp in context.Employees

    where emp.EmployeeId == empId

    select emp.EmployeeName;

    The above code will return a sequence, If you know that the sequence contains only one element, you could use Single() to retrieve that element. Besides the following LINQ methods could be used to retrieve a single element from a sequence:

    • Single() returns the item, throws an exception if there are 0 or more than one item in the sequence.
    • SingleOrDefault() returns the item, or default value (null for string). Throws if more than one item in the sequence.
    • First() returns the first item. Throws if there are 0 items in the sequence.
    • FirstOrDefault() returns the first item, or the default value if there are no items)

    Best Regards,

    Fei Han

    • Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM
    Thursday, April 9, 2015 9:58 PM

All replies

  • User2103319870 posted

    I am getting this error.

    "Cannot implicitlty convert Sytem.Linq.Iquerable<string> to string ".

    You need to use SingleorDefault() or FirstorDefault() at the end of query like given below

    string result = (from emp in context.Employees
    
    where emp.EmployeeId == empId
    
    select emp.EmployeeName).SingleOrDefault();
    
    return result;

    • Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM
    Thursday, April 9, 2015 8:12 PM
  • User61956409 posted

    Hi sreeja1234,

    Thanks for your post.

    from emp in context.Employees

    where emp.EmployeeId == empId

    select emp.EmployeeName;

    The above code will return a sequence, If you know that the sequence contains only one element, you could use Single() to retrieve that element. Besides the following LINQ methods could be used to retrieve a single element from a sequence:

    • Single() returns the item, throws an exception if there are 0 or more than one item in the sequence.
    • SingleOrDefault() returns the item, or default value (null for string). Throws if more than one item in the sequence.
    • First() returns the first item. Throws if there are 0 items in the sequence.
    • FirstOrDefault() returns the first item, or the default value if there are no items)

    Best Regards,

    Fei Han

    • Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM
    Thursday, April 9, 2015 9:58 PM