Let DataGridView interpret -1 as null value (C++/CLI)

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maik.wiege@googlemail.com - 13 Dec 2006 10:34 GMT

Hello,
I'm developing in C++/CLI and using a DataGridView that is bound to a
BindingSource that uses a list of objects of my my custom class. This
objects have some properties that are displayed in the columns of the
datagrid. Some of these properties are of type int and therefor do not
have a null value (nullptr). In my program I internaly use -1 as the
meaning of "not set".
Is there a way to let the DataGridView display that property values as
null values instead of displaying the -1, meaning displaying just an
empty cell?
I don't think that this is possible using custom formatation of the
column, but I do not want to override the whole DataGridView class.

Does anyone have a nice and simple idea how one could accomplish that?

Thanks
Maik Wiege

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Kevin Spencer - 13 Dec 2006 12:45 GMT

Use a nullable int. The syntax is:

int? i = 0;
i = null;

// etc.

This is a System.Nullable<int>

Signature

HTH,

Kevin Spencer
Microsoft MVP
Bit Player
http://unclechutney.blogspot.com

Expect the unaccepted.

> Hello,
> I'm developing in C++/CLI and using a DataGridView that is bound to a
[quoted text clipped - 13 lines]
> Thanks
> Maik Wiege

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maik.wiege@googlemail.com - 13 Dec 2006 14:24 GMT

Thanks Kevin,

I didn't want to do that, bacause than I have to rewrite many parts in
my code and I'm having some perfomancy doubts about it, but it seems
that it is my only chance.

Thanks again
Maik

Kevin Spencer schrieb:

> Use a nullable int. The syntax is:
>
[quoted text clipped - 32 lines]
> > Thanks
> > Maik Wiege

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Let DataGridView interpret -1 as null value (C++/CLI)

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