Testing the 'type' of an Object???

[Darryn Ross]

Hi...

I am not sure how to test the type of an object that i define

object a = "test" ;
object b = 1 ;
object c = true ;

how do i test each of the three objects to find out what types they are.. e.g string, int, bool???

Regards

[Joe Mayo [C# MVP]]

>"Darryn Ross" <da****@datawav e.com.au> wrote in message
news:uy******** ******@TK2MSFTN GP12.phx.gbl...

Hi... I am not sure how to test the type of an object that i define object a = "test" ;
object b = 1 ;
object c = true ; how do i test each of the three objects to find out what types they are..

e.g string, int, bool???

Hi Darryn,

You can use the 'is' operator:

if (a is string) {...}

If you wanted to find out what type it was you could do this:

string myTypeString = a.GetType().ToS tring();

Joe
--
http://www.csharp-station.com

[Champika Nirosh]

I don't think so.. since at the creation level all three object are created
as object you wont be able to get the result you want with the given
solution

if so do it this way

string my = "test";
int i = 1;
bool bol = true;

object a = my;
object b = i;
object c = true;

this way you will get the result

Nirosh.

"Joe Mayo [C# MVP]" <jm***@nospamAt CSharpDashStati on.com> wrote in message
news:e9******** ******@TK2MSFTN GP11.phx.gbl...

"Darryn Ross" <da****@datawav e.com.au> wrote in message

news:uy******** ******@TK2MSFTN GP12.phx.gbl...

Hi...

I am not sure how to test the type of an object that i define

object a = "test" ;
object b = 1 ;
object c = true ;

how do i test each of the three objects to find out what types they are..

e.g string, int, bool???

Hi Darryn,

You can use the 'is' operator:

if (a is string) {...}

If you wanted to find out what type it was you could do this:

string myTypeString = a.GetType().ToS tring();

Joe
--
http://www.csharp-station.com

[Vladimir Scherbina]

object a = "test" ;
object b = 1 ;
object c = true ;

if (a.GetType() == typeof(string))
{
}
else if (b.GetType() == typeof(int32))
{
}
else if (c.GetType() == typeof(bool))
{
}

Vladimir Scherbina,
Ukraine, Kiev.

"Darryn Ross" <da****@datawav e.com.au> wrote in message news:uy******** ******@TK2MSFTN GP12.phx.gbl...
Hi...

I am not sure how to test the type of an object that i define

object a = "test" ;
object b = 1 ;
object c = true ;

how do i test each of the three objects to find out what types they are.. e.g string, int, bool???

Regards

[Magnus Lidbom]

Rearranged

On Fri, 6 Feb 2004 17:30:31 +0600, "Champika Nirosh"
<cn*****@textce ntric.lk> wrote:

"Joe Mayo [C# MVP]" <jm***@nospamAt CSharpDashStati on.com> wrote in message
news:e9******* *******@TK2MSFT NGP11.phx.gbl.. .

>"Darryn Ross" <da****@datawav e.com.au> wrote in message news:uy******** ******@TK2MSFTN GP12.phx.gbl...

>Hi...

>I am not sure how to test the type of an object that i define

>object a = "test" ;
>object b = 1 ;
>object c = true ;

>how do i test each of the three objects to find out what types they are..

e.g string, int, bool???

Hi Darryn,

You can use the 'is' operator:

if (a is string) {...}

If you wanted to find out what type it was you could do this:

string myTypeString = a.GetType().ToS tring();

Joe
--
http://www.csharp-station.com

I don't think so.. since at the creation level all three object are created
as object you wont be able to get the result you want with the given
solution

This is incorrect. Try running this:

using System;
namespace CSharpConsole
{
class Clarification
{
[STAThread]
static void Main(string[] args)
{
object anInt32 = 3;
int anotherInt32 = 4;
Console.WriteLi ne(
@"Every object ever created is of a specific type.
anotherInt32 is of type {0}.
mySecondInt is of type {1}",
anInt32.GetType ().Name,
anotherInt32.Ge tType().Name);
}
}
}
The type of the varible to which you assign a literal such as 1 or
"myString" doesn't affect the type of the literal. It may cause an
implicit conversion, or boxing, but that doesn't change the fact that
the original literal has its own well defined type.

/Magnus Lidbom

[Jon Skeet [C# MVP]]

Champika Nirosh <cn*****@textce ntric.lk> wrote:

I don't think so.. since at the creation level all three object are created
as object

No they're not. Just because the variables are *declared* as object
doesn't change the type of the object itself at all.

Here's a test program showing that Joe was right:

using System;

class Test
{
static void Main()
{
object a = "test" ;
object b = 1 ;
object c = true ;

ShowType(a);
ShowType(b);
ShowType(c);
}

static void ShowType(object o)
{
if (o is string)
{
Console.WriteLi ne ("string");
}
else if (o is int)
{
Console.WriteLi ne ("int");
}
else if (o is bool)
{
Console.WriteLi ne ("bool");
}
else
{
Console.WriteLi ne ("Unknown");
}
}
}

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Jon Skeet [C# MVP]]

Vladimir Scherbina <vl*********@uk r.net> wrote:

object a = "test" ;
object b = 1 ;
object c = true ;

if (a.GetType() == typeof(string))
{
}
else if (b.GetType() == typeof(int32))
{
}
else if (c.GetType() == typeof(bool))
{
}

Although that will indeed work, using "is" performs better, is more
readable, and works with derived types as well (which isn't applicable
here, but would be in other situations).

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too