Urgent : gettype of an object

[DanielaTm]

Hi,
I have an urgent problem:
I have a method which receives 2 objects as parameters.I need to find if one of them is double, string, I mean the type.
How can I do that

[hansipet]

if(objectName.GetType() == typeof(Double)){
...
}

Regards
Hansjörg

[stepi]

Hi,
Here is the code for you as example:

private void foo(object o)
{
            if (o.GetType() == typeof(Double))
            {
               ///you have a double
            }
            else
            {
                   if(o.GetType() == typeof(String))
                   {
                      //you have string
                   }
                   else
                   {
                      //handle the code for bad parameter        
                   }
            }
}

[DanielaTm]

Hi,
It would be any risk implemented like this: (or any difference)

if(objectName.GetType() == "System.Double")

?

Thanks

[stepi]

Hi,
The code you have written won't compile. Here is how it should be :

if(objectName.GetType().ToString() == "System.Double")

[DanielaTm]

Yes, it worked.
My problem was that I had to use it in a switch.
And I used it like this:
1.
switch (ob1.GetType().ToString())
{
case "System.Double":
switch (ob2.GetType().ToString())
{
case "System.Double":
if (((double)ob1) < ((double)ob2))
return true;
break;
default:
return false;
}
break;
.......
It worked.
and I had to use it like this, because when I tried with typeof(), meaning

2.
switch (ob1.GetType().)
{
case typeof(Double)
.......
said "Ïntegral type expected", didn't worked

My question:
1. why didn't work the second style??
2. Is it ok to leave the code like in the first example?

Thank you,
Daniela

[stepi]

Hi again,
A switch statment can only take a sbyte, byte, short, ushort, int, uint, long, ulong, char, string, or an enum-type. Because a Type object can not be converted into any of this integral types, the compiler gives an error. So yes it is ok leaving your code as it is.

[jhammer]

As far as I know you can use switch statements with value type only.

Here is your code refactored:

if (ob1.GetType() == typeof(Double)   && ob2.GetType() == typeof(Double) ){
    return (double)ob1 < (double)ob2;
}
return false;