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Nullable Datatypes

Contrary to VO, many datatypes in the .NET Framework don't allow null values.

One of the most important ones is the DataTime class, that cannot have a null value, contrarily to VO, where a date variable can contain null_date.

In the .NET Framework there is the Nullable datatype, defined as follows:


and to be used like this:

local dDate as Nullable<DateTime>

dDate := null
dDate := DateTime.Now

Reference types in the .NET Framework don't need Nullable, they already support null values.

For more information see

nullable.txt · Last modified: 2018/07/02 05:54 by wolfgangriedmann