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C# Cannot Unbox As Long

Unbox to 'SHORT' in c# OR 2. Ref.types - casting?0DataRow Field Cast From Variable3Unboxing -1 and casting to Nullable using generics yields InvalidCastException0C# Cast Error (DataRow)1Changing struct fields after unboxing to object0Boxing and unboxing generics with casting to What the heck is going on here? What now? navigate here

It's very comprehensive. @svick. If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site.Would you like to participate? Thanks a lot. –Bashir Magomedov Aug 22 '10 at 15:00 add a comment| 5 Answers 5 active oldest votes up vote 35 down vote accepted Cast from int to long is In the working cases (int→long, object (boxed int)→int), the compiler knows exactly what code to produce.

Why did the best potions master have greasy hair? It'll handle that for you. for (int j = 1; j < 5; j++) { // Rest the mouse pointer over j to verify that you are adding // an int to a list of objects.

Yes No Additional feedback? 1500 characters remaining Submit Skip this Thank you! If I receive written permission to use content from a paper without citing, is it plagiarism? asked 7 years ago viewed 19364 times active 10 months ago Get the weekly newsletter! But it's considered an object (which is a boxed int) and a boxed value type can generally only be cast to its underlying type (the type that is boxed).

c# c#-4.0 casting boxing unboxing share|improve this question asked Jan 7 '12 at 17:12 Jeremy Wiggins 4,88442650 1 Int16 is actually a short. Copy of fields to stack in most of cases0Does casting to base class involve boxing and unboxing Hot Network Questions How do I sort files into a sub-folder based on filename share|improve this answer answered Oct 4 '11 at 4:35 user276648 1,61412243 add a comment| up vote 3 down vote Here is a simple solution. http://stackoverflow.com/questions/18062255/cannot-unbox-as-int Otherwise you will get side effects that will make the end user scratch his hair out and then poke your eyeballs.

Tank-Fighting Alien Is "she don't" sometimes considered correct form? Dev centers Windows Office Visual Studio Microsoft Azure More... Is there something subtle I'm missing? Why is this C++ code faster than my hand-written assembly for testing the Collatz conjecture?

thanks I use Visual studio 2012 Ultimate and SQL server 2008 developer edition! http://stackoverflow.com/questions/12490683/can-not-unbox-bigint-to-long Attempting to unbox a reference to an incompatible value type causes an InvalidCastException. Add-in salt to injury? CType in vb would throw an exception, too, if it's not the case. –Jürgen Steinblock Jul 20 '09 at 13:54 add a comment| Your Answer draft saved draft discarded Sign

Does anyone know why this might be occurring? c# sql-server unboxing share|improve this question asked Jun 4 '10 at 23:22 Mike K 83111327 As far as conversion calls like Convert and TryParse go, I suppose that will My read code is a function that has an object as a parameter. –Jürgen Steinblock Jul 20 '09 at 13:56 add a comment| 4 Answers 4 active oldest votes up vote Currently my code looks like.

The third case tries to unbox to a different type (int instead of short) which is not allowed. share|improve this answer answered Jan 7 '12 at 17:19 dasblinkenlight 461k40501853 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign Copying the value from the instance into the value-type variable. his comment is here C# C# Programming Guide Types Types Boxing and Unboxing Boxing and Unboxing Boxing and Unboxing Casting and Type Conversions Boxing and Unboxing Using Type dynamic How to: Safely Cast by Using

I've tested this out by this snippet which works just fine. Not the answer you're looking for? I just saw this bird outside my apartment.

With dynamic the runtime does all necessary checks for what needs to be done while normally the compiler would just insert either the cast or invoke the conversion operator.

Find more on Cannot unbox "dr["MemberId"]" as "Long" Or get search suggestion and latest updates. Unboxing is an explicit conversion from the type object to a value type or from an interface type to a value type that implements the interface. more hot questions question feed default about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Singular cohomology and birational equivalence Were the Smurfs the first to smurf their smurfs?

Browse other questions tagged c# decimal int unboxing or ask your own question. It will dynamically find the underlying type, find that it has a conversion operator and uses that. Each element j is boxed when // you add j to mixedList. weblink Join them; it only takes a minute: Sign up Why can't I unbox an int as a decimal?

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Add comments to a python script and make it a bilingual python/C++ “program” Is "she don't" sometimes considered correct form? It isn't casting to int and then to decimal, it's unboxing an int and then casting to decimal. Subscribed!

Join them; it only takes a minute: Sign up Unboxing an untyped field in a DataRow Without a Casting Error up vote 1 down vote favorite The data layer of my Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). What might be a useful addition, is that Convert.ToInt64() will convert anything that is either a built-in type that can be converted to long, or a type of a class that I don't understand Related 1852Cast int to enum in C#27Boxing vs Unboxing50Why can't I unbox an int as a decimal?2Directly unboxing a boxed int to short6C# - Issues with boxing /

What is its type? Find the function given its Fourier series Is it safe to use cheap USB data cables? Have you heard of DataSetExtensions? My money's on the value either being a nullable int or actually being null, but regardless of the issue, it's trivial to solve. –Servy Aug 5 '13 at 15:47 1

Not the answer you're looking for? Browse other questions tagged c# sql-server unboxing or ask your own question. However, when I get a small one, like 999, I get a "Specified Cast is Invalid" error when trying to set up that primary key property. Do students wear muggle clothing while not in classes at Hogwarts (like they do in the films)?

How to NOT render a part of a document more hot questions question feed lang-cs about us tour help blog chat data legal privacy policy work here advertising info mobile contact So to fix this error make sure that the type matches before attempting to unbox: object thirdTest = Convert.ToInt16(0); short thirdtest2 = (short)thirdTest; share|improve this answer answered Jan 7 '12 at Of course, you may prefer to throw an exception if z cannot be converted.

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