Thalia: Über 10 Mio Bücher ❤ Immer versandkostenfrei ✓ Lieferung nach Hause oder in die Filiale ✓ Jetzt»A Programmer’s Guide to C# «online bestellen!. Eric Gunnerson One of the “late breaking” features in C# is what is known as “Nullable Types”. The details can be found in the C# language spec. Ung?ltige Konvertierung von der Zeichenfolge " in Typ Date. Buy Programmer’s Introduction to C# from Dymocks online BookStore. Find latest reader to C# Nick Wienholt, Eric Gunnerson, Anders Hejlsberg.
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Nullable types in C#
Structs Value Types Chapter 9: How can a bool have three values! Gunjerson there a big demand for this? In his spare time, he enjoys writing about himself in the third person.
June 11, at 8: Interestingly, C generator functions are a form of list comprehension, something that I used to consider one of the more exotic properties of functional languages.
Nullable types in C# – Eric Gunnerson’s Compendium
June 9, at 2: I must say that C is a nice gunnrrson but it misses one of the key things that makes for widespread adoption of it by developers… cross platform compatibility. The one thing I am not sure I like is the function syntax changes like:. June 3, at 2: But I wonder most about why I need this?
April 8, at 8: Operators and Expressions Chapter March 22, at 2: To make this easier, in VSwe’re introducing a new type named “Nullable”, that looks something like this it’s actually more complex than this, but I want to keep the example simple:. But I say, better to have clearly nullable values than “magic” values like Stream.
To the down in the trenches programmer, this kind of syntax will become very confusing.
June 2, at ReadByte returning -1 when the stream is done which are too easily ignored. March 18, at 1: May 28, at 9: Bill Bozeman’s Blog says: Eric Gunnerson blogged dric week about Nullable types in C 2.
This is a good solution, but you have to write it yourself.
The main thing is, it should be almost trivial to implement from the compiler standpoint, and would provide a quantum leap in program robustness [well, for us, program readability as our code standards ensure that every single public function, eri, or property setter check each variable is not null — our code would halve in size! Other Class Details Chapter 8: June 2, at 1: April 12, at 9: Use C features effectively, in the way they were intended Vo the newest C features to your coding problems Streamline vonn database code using LINQ Use async support and the task parallel library to improve performance.
Beware, there is a real life counterpart to this: Though value types seem nice at first, they cause nothing but problems. October 17, at This new C feature will allow one to specify a Type like int? May 28, at Eric Gunnerson is a software developer working at Microsoft. If you cant see a question mark, you shouldnt be programming in C.
A Programmer’s Guide to C# 5.0 (eBook, PDF)
Similarly, rather than needed to write a null test as: He s been a developer for longer than he cares to admit, and has worked on everything from microcontrollers to minicomputers. So can we assume that the next generation of typed DataSets will utilize this feature and do away with the horrible IsFieldNameNull convention?
In the past, there were several ways of doing this: We have always enjoyed the ability of setting reference types to null Nothing in VB from the early.