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Cannot Modify Result Unboxing Conversion C#

If TValue is a value type, then dict[i] would also return a copy and not a reference to the value. p2.x = 2; } } struct Point { public int x, y; } Show: Inherited Protected Print Export (0) Print Export (0) Share IN THIS ARTICLE Is this page helpful? I have tried the following code: for (int i = 0; i < instruments.Count; i++) { ((VCV)htVCV)[i].Mean = Mathematik.Statistics.Mean(((double[])htCandles.Values)); } But I have the following error Cannot modify the result of object a=x; int Y=(int)a; //unboxing I think Random r=new Random(); object X=r; Random R=(Random)X; // casting c# boxing value-type share|improve this question edited Jan 19 '11 at 11:47 Steve 30.6k31931 asked http://scriptkeeper.net/cannot-modify/cannot-modify-the-result-of-an-unboxing-conversion.html

mixedList.Add("First Group:"); // Add some integers to the list. Query an XML file without loading Read all e-mail addresses form NK2 Categories MSDNArchitectureWindows Embedded CompactArchived Forums #Archived Forums A-BMicrosoft Partner CenterVirtualizationMicrosoft RForums Redesign - Q&A ...Visual C++MSBuildWindows Desktop Search...Windows Desktop current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. Shortord[i].oe1 = newvalue; Regards Ralph Facebook Twitter YouTube Ralph View Public Profile Send a private message to Ralph Find More Posts by Ralph 01-18-2010, 06:21 AM #4 malmaa Member

Learning resources Microsoft Virtual Academy Channel 9 MSDN Magazine Community Forums Blogs Codeplex Support Self support Programs BizSpark (for startups) Microsoft Imagine (for students) United States (English) Newsletter Privacy & cookies Index(es): Date Thread Flag as inappropriate (AWS) Windows Science Usenet ArchiveAboutPrivacyImprint www.tech-archive.net >Archive >DotNet >microsoft.public.dotnet.languages.csharp >2007-06 Cookies help us deliver our services. Sometimes I need to change the field values of the elements held by the ArrayList. Each element j is boxed when // you add j to mixedList.

Jon Jun 20 '07 #5 P: n/a Christof Nordiek "Carl Johansson" to a brokerage account should be sent to your broker directly. using MemoryStream without ^). But you can always benefit from knowing more.

DateTime is an example: you can't *change* the "seconds" (for example) of an existing DateTime - you can, however, swap the structure for a different one, created either via a constructor, See ASP.NET Ajax CDN Terms of Use – http://www.asp.net/ajaxlibrary/CDN.ashx. ]]> NinjaTrader Support Forum > NinjaTrader 7 > General 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 if I remove the boxing the error is cannot convert type System.Collections.Hashtable to VCVDemo.VCV Could someone please tell me where I am going wrong in the casting of this subroutine Thanks,

You could try using a Dictionary instead (which is pretty much a strongly-typed hash table). If I receive written permission to use content from a paper without citing, is it plagiarism? "Carrie has arrived at the airport for two hours." - Is this sentence grammatically correct? 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. Even with a dictionary, you can't modify a field of a stored value.

Wouldn't this have a very similar problem? Thursday, October 01, 2009 3:45 PM 0 Sign in to vote Even with a dictionary, you can't modify a field of a stored value. Thursday, October 01, 2009 3:18 PM 0 Sign in to vote You could try using a Dictionary instead (which is pretty much a strongly-typed hash table). Sometimes I need to change the field values of the elements held by the ArrayList.

Would we find alien music meaningful? his comment is here Learning resources Microsoft Virtual Academy Channel 9 MSDN Magazine Community Forums Blogs Codeplex Support Self support Programs BizSpark (for startups) Microsoft Imagine (for students) United States (English) Newsletter Privacy & cookies 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 If one supplier has delayed your project schedule should the other suppliers on the project be alerted to the new timeline?

Best way to remove old paint from door hinges Moving a member function from base class to derived class breaks the program for no obvious reason Why do languages require parenthesis However, what exactly happens, that depends on the type, and a lot of other things. i = 456; // The change in i does not effect the value stored in o. this contact form The content you requested has been removed.

To reach the class members of Osto you need to implement an additional step: Osto o = Shortord[i]; o.os2 = ExitShortStop(...); Since we are dealing with class references, the modifications in View Full Risk Disclosure. Related 27Boxing vs Unboxing2Boxing/unboxing - only value types?

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You have explained every thing I need to know about List and Class. Creating symlink for a file on Windows 7 gives error Tank-Fighting Alien I just started my first real job, and have been asked to organize the office party. So, if the compiler allowed you to do this, it would be very confusing, because the assignments wouldn't actually do anything. 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

The compiler prevents you from modifying such variables because any modification would go away when the temporary variable goes away. I now get an invalid cast excpetion Unable to cast object of type 'VCVDemo.VCV' to type 'System.Double[]'. Thursday, October 01, 2009 3:22 PM 0 Sign in to vote Aye, you're right. navigate here System.Console.WriteLine("The value-type value = {0}", i); System.Console.WriteLine("The object-type value = {0}", o); } } /* Output: The value-type value = 456 The object-type value = 123 */ UnboxingUnboxing is an explicit

This is where this book is aimed. By using our services, you agree to our use of cookies.Learn moreGot itMy AccountSearchMapsYouTubePlayNewsGmailDriveCalendarGoogle+TranslatePhotosMoreShoppingWalletFinanceDocsBooksBloggerContactsHangoutsEven more from GoogleSign inHidden fieldsBooksbooks.google.com - I he title of this book may seem odd; you probably First, you can define the same casting operators that were involved in value types, which means casting one reference type to another can return a wholly new object, containing quite different Thursday, October 01, 2009 3:57 PM Microsoft is conducting an online survey to understand your opinion of the Msdn Web site.

Thursday, October 01, 2009 3:24 PM 0 Sign in to vote for (int i = 0; i < instruments.Count; i++) { ((VCV)htVCV[i]).Mean = Mathematik.Statistics.Mean((double[])htVCV[i]); } I changed over the struct to This might be a general C# question. Count trailing truths How are the functions used in cryptographic hash functions chosen? I have an ArrayList instance to which I add two types of elements.

You should use a method named Dispose() for this purpose. Cheers - Dude - I dont have much luck with hashtables.... ;-) out of interest if I was to want to get a double return series from another double[] which were unbox2=(int?)x;//successful unbox long unbox3=(long)x;//error can't unbox int to long long unbox4=(long)(int)x;//works. That's where the copy comes in.

I think the following should work: private List Shortord = new List(); ... The content you requested has been removed. Any simpler way of modifying just the particular inner element(Oe1)? That is way I rebuilt the complete element and then assigned as Shortord[i]= Ortmp; I tried with class instead of struc but since we do not know the number of elements

Unbox the variable, mutate it, and then re-box it into the variable if that is indeed where you want it to end up. –Servy Jun 24 '13 at 16:55 1 I understand, if there are different types of objects in the list go for "ArrayList", if all the elements are of similar type go for generic "List". Point^) and treating (some) classes as value types (e.g. That's where the copy comes in.