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Cannot Modify The Result Of An Unboxing Conversion C#

Jon Jun 20 '07 #3 P: n/a Ignacio Machin \( .NET/ C# MVP \) Hi, I would strongly advice agains using a collection with two different types, even more if one You could try using a Dictionary instead (which is pretty much a strongly-typed hash table). Why won't curl download this link when a browser will? When you access an element of a collection class that stores objects, if the element type is a struct then the element is "boxed" which involves making a copy of the Check This Out

Also both casting and unboxing uses the same syntax - (expected type)(object), right? View Answer Related Questions Comments Comment can't Submit. new code samples recent codes sign in New user? methods. additional hints

When you access an element of a collection class that stores objects, if the element type is a struct then the element is "boxed" which involves making a copy of the This is an example of that. You don't need any sort of cast expression to box though - for example your second line of code contains a boxing operation but no cast expression. Example: object o = intValue; // boxing int i = (int)o; // unboxing Boxing also comes into play when casting to an interface.

He has consulted for Microsoft on DNA solutions, and he has held consulting positions with Daimler Benz, Microsoft, NatWest, and other major corporations. So why do we have so many bugs in our code? It is unable to Modify the file ... View Answer Related Questions Comments Comment can't Submit.

E.g ... Login | Register Svg Shape Not Sharp On Non-Retina, But Sharp On Retina I'm using a SVG inside a tag to display a shape with only a border.On non-retina (left) the Sharp Architecture; Accessing Validation Results Breeze.Sharp Mvvm Trying To Get Results From The Database - Error Svg Shape Not Sharp On Non-Retina, But Sharp On Retina Conversion Of A Decimal To https://social.msdn.microsoft.com/Forums/en-US/30481c07-c326-41fd-a550-8578dea0e3cf/cannot-modify-the-result-of-an-unboxing-conversion?forum=csharplanguage So after I have done with the modification, I will unbox it to get the final copy (B) that is the copy of the modified copy (A). –colinfang Jun 24 '13

In the case of the class type element, this is no problem. Many (the majority of) classes are mutable. However, what exactly happens, that depends on the type, and a lot of other things. The final conversion you've shown is a reference conversion - it maintains representational identity, so the values of X and R are both references to the same object.

error CS0445: Cannot modify the result of an unboxing conversion I'm quite new to C# and can't really see how to get rid of the above error. Would we find alien music meaningful? Wouldn't this have a very similar problem? Login | Register Remove Sharp Edged Circles On Product Images another tng is on same link, you can see 2 Sharp edged circles on product images . ...

Let's assume that "someValueType" is a struct, which also implements IDisposable: IDisposable disp = (IDisposable)someValueType; // boxed Casting a reference type, can do something else as well. his comment is here Make a suggestion Dev centers Windows Office Visual Studio Microsoft Azure More... You should use a method named Dispose() for this purpose. Well, in its basic form, it is considered casting.

Secondly, do I really have to create a new class with similar content of the struct to get rid of this error? Can I hint the optimizer by giving the range of an integer? To create an instance of a class in general, we use Osto Var = new Osto(); (where Var is an instance of the class not a list) Since we are using http://scriptkeeper.net/cannot-modify/cannot-modify-the-result-of-an-unboxing-conversion.html On 1941 Dec 7, could Japan have destroyed the Panama Canal instead of Pearl Harbor in a surprise attack?

Regards, Facebook Twitter YouTube malmaa View Public Profile Send a private message to malmaa Find More Posts by malmaa 01-19-2010, 04:59 AM #9 Ralph Senior Member Join Date: You cast the expression from one type, to another. A control cannot modify its parents' control collections.

So correct comments would be int x = (int)2.5; //casting with conversion object a=x; //casting with boxing int Y=(int)a; //casting with unboxing Random r=new Random(); object X=r; Random R=(Random)X; //casting without

To fix this, declare a new value-type variable to store the intermediate expression, and assign the result of the unboxing conversion to that variable.The following code generates CS0455. Compare elements iteratively How to disable the high priority publish option in SDL Tridion How safe is 48V DC? Regards Carl Johansson Jun 20 '07 #4 P: n/a Carl Johansson Dear Jon! 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

but since we do not know the number of elements in the List ... Coders, architects, and developers always strive to do their best, and if given the choice to do something correctly or incorrectly they will do it correctly. Austin NinjaTrader Customer Service Use Kinetick, NinjaTrader’s preferred market data service - Learn More Free online training events - View Schedule Facebook Twitter YouTube NinjaTrader_Austin View Public Profile Send a navigate here View Answer Related Questions Comments Comment can't Submit.

Modifying the copy wouldn't change the original anyway, so it wouldn't make much sense to allow it. In other words, either the value type need to define a casting operator that can cast to that other type, or that other type need to define a casting operator that However, according to your explanation in your last post I believe too the generic list is the better choice for your application. But any help or guidance is highly appreciated.

What that operator does, is up to the author of that operator. Thank you so much for your help. But you're writing your code in C#, so your code follows the rules of C#.