(possibly) a simple question

[Saurabh]

Hi All,

I quite like the idea of using the 'as' operator in C# and test for nullness
for example,

void MyFunction(Object o)
{
MyDataType dt = o as MyDataType;
if (dt == null)
{
DoSomething();
}
}

but I cannot use it on the value types. There is a similar situation as
above and I am expecting a System.Drawing.Point datatype whats the best way
to carry out the cast? Is it just cast it and catch the exception if it
throws an invalid cast exception.

Any comments / recommendations ?

TIA,

--Saurabh

 

[Jon Skeet [C# MVP]]

I quite like the idea of using the 'as' operator in C# and test for nullness
for example,

void MyFunction(Object o)
{
MyDataType dt = o as MyDataType;
if (dt == null)
{
DoSomething();
}
}

but I cannot use it on the value types. There is a similar situation as
above and I am expecting a System.Drawing.Point datatype whats the best way
to carry out the cast? Is it just cast it and catch the exception if it
throws an invalid cast exception.

Use "is" and then cast. It's slower, as it basically involves casting
twice, but it's nicer than using an exception.

 

[Saurabh]

Thanks Jon.

--Saurabh

Use "is" and then cast. It's slower, as it basically involves casting
twice, but it's nicer than using an exception.