String to Int32?

  • Thread starter Thread starter Fred Chateau
  • Start date Start date
F

Fred Chateau

How can I convert a string into a nullable integer?

If string is empty, convert to nullable integer. Set value to null. Else, convert string value to
nullable integer value.

In other words, I want to be able to do the following:

Int32? ID = String.IsNullOrEmpty(value.ID) ? null : Convert.ToInt32?(value.ID)
 
Fred,

You have an error in your code, but it's minor:

Int32? ID = String.IsNullOrEmpty(value.ID) ? (int?) null :
Convert.ToInt32(value.ID);

But beyond that, that's exactly how I would do it.
 
Int32? ID = String.IsNullOrEmpty(value.ID) ? null :
Convert.ToInt32?(value.ID)
Click to expand...

What about

int? ID = string.IsNullOrEmpty(value.ID) ? null : int.parse(value.ID);
 
ReSharper displays error "No implicit conversion between null and int". Same error as my code.
 
Thank you for your help with it.

--
Regards,

Fred Chateau
fchateauAtComcastDotNet


Nicholas Paldino said:
Fred,

You have an error in your code, but it's minor:

Int32? ID = String.IsNullOrEmpty(value.ID) ? (int?) null : Convert.ToInt32(value.ID);

But beyond that, that's exactly how I would do it.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Fred Chateau said:
How can I convert a string into a nullable integer?

If string is empty, convert to nullable integer. Set value to null. Else, convert string value to
nullable integer value.

In other words, I want to be able to do the following:

Int32? ID = String.IsNullOrEmpty(value.ID) ? null : Convert.ToInt32?(value.ID)

--
Regards,

Fred Chateau
fchateauAtComcastDotNet
Click to expand...
Click to expand...
 
ReSharper displays error "No implicit conversion between null and int".
Same error as my code.
Click to expand...

Then you need to cast it

int? ID = string.IsNullOrEmpty(value.ID) ? null : (int?)int.parse(value.ID);
 
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