Solved

Issue with type casting in c#

Posted on 2014-12-28
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Last Modified: 2015-01-20
Hi Experts,

I am getting following error when I try to retrieve value (1 or 0) from database.How to get rid of this error?

"operator == cannot be applied to operands of type bool and int"

//employeerepo.cs

pubic bool checkifempexist(int ecode)

{

//if employee exist in database  returns non-zero else returns zero

if(ecode==0)

 return false; //non-zero

else

return true;  //zero

}

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Code to check if employee code exist or not

//employee.cs

bool isemployeeexists(employee e)

{

var rep=new employeerepo();

//retrieves 1 or 0 
var empcode=rep.checkifempexist(e.code)

if(empcode==1)  //Throwing error here
{
return true
}
return false;
}

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0
Comment
Question by:ksd123
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4 Comments
 
LVL 63

Assisted Solution

by:Fernando Soto
Fernando Soto earned 100 total points
ID: 40520524
In this line of code,

var empcode = rep.checkifempexist(e.code)

the function checkifempexist is returning a bool type. In the following statement,

if( empcode == 1 )  //Throwing error here

you are comparing a bool, empcode, with the integer value of 1. They are not of the same data type. In C programming language this is fine but C# no.

either have checkifempexist return an integer value or change the 1 in the if statement to true.
0
 
LVL 44

Expert Comment

by:AndyAinscow
ID: 40520556
instead of:

//retrieves 1 or 0
var empcode=rep.checkifempexist(e.code)

if(empcode==1)  //Throwing error here
{
return true
}
return false;


use this:
//retrieves 1 or 0
return (rep.checkifempexist(e.code) > 0);  true if the checkifempexists returns anything greater than zero
0
 
LVL 23

Accepted Solution

by:
Michael74 earned 400 total points
ID: 40520958
The quickest way to resolve this would be to cast the response as an integer

int empcode = (int)rep.checkifempexist(e.code)

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http://msdn.microsoft.com/en-US/library/ms173105(v=VS.100).aspx
or
int empcode= Convert.ToInt32(re.checkifempexist(e.code)

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http://msdn.microsoft.com/en-us/library/2cew9dz7(v=vs.110).aspx

Alternatively you could have the method checkifempexist return an integer value

pubic int CheckIfEmpExist(int ecode)
{
   //if employee exist in database  returns non-zero else returns zero
   if (ecode==0)
      return 1; //non-zero
   else
      return 0;  //zero
}

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Note: Using capitalisation can greatly assist in making your code easier to read
http://msdn.microsoft.com/en-us/library/vstudio/ms229043(v=vs.100).aspx
0
 
LVL 11

Expert Comment

by:louisfr
ID: 40521718
In the isemployeeexists method, why not returning directly the result of the checkifempexist method?
bool isemployeeexists(employee e)
{
    var rep=new employeerepo(); 
    return rep.checkifempexist(e.code);
}

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0

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