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C# Cannot Unbox As Double

Center trace between two pads How can ransomware know file types? In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms If the source operand is null, a System.NullReferenceException is thrown. It isn't casting to int and then to decimal, it's unboxing an int and then casting to decimal. this contact form

If you just know the object can be converted to decimal in some way, try System.Convert.ToDecimal method. One Very Odd Email How is True < 2 implemented? Happy Coding and practise a lot ! Not the answer you're looking for? http://stackoverflow.com/questions/1085097/why-cant-i-unbox-an-int-as-a-decimal

Console.WriteLine(item); } // The following loop sums the squares of the first group of boxed // integers in mixedList. Using try and catch, an error message is displayed when the error occurs. Prepared for Yet Another Simple Rebus?

Linked 4 Cannot unbox as Int 2 Runtime Type Checking and Unboxing Related 27Boxing vs Unboxing47What is the difference between boxing/unboxing and type casting?35Boxing unboxing and generics2Boxing/unboxing - only value types? Why did the best potions master have greasy hair? mixedList.Add("First Group:"); // Add some integers to the list. This has the advantage that the original type doesn’t have to be known.

To perform a cast, specify the type that you are casting to in parentheses in front of the value or variable to be converted. The nth numerator Why are password boxes always blanked out when other sensitive data isn't? Apr 30, 2009 11:36 AM|SGWellens|LINK I don't know. http://stackoverflow.com/questions/1153612/whats-the-best-approach-to-solve-the-c-sharp-unboxing-exception-when-casting-an Consider this code: Dim x As Integer = 5 Dim y As Object = x Dim z As Decimal = CType(y, Decimal) No error from compiler or at runtime.

y = (Int64)o; // Explicit boxing to double should read y = (Int64)o; // Explicit unbox to double Good Article otherwise. Console.WriteLine(String.Concat("Answer", 42, true)); // List example. // Create a list of objects to hold a heterogeneous collection // of elements. Steve Wellens My blog Reply Paul Linton Star 9555 Points 2785 Posts Re: why double first, before casting to a Float? For more information, see How to: Convert a byte Array to an int, How to: Convert a String to a Number, and How to: Convert Between Hexadecimal Strings and Numeric Types.Implicit

Because when I ran the following simple box/unbox between object and decimal, worked like a charm. System.Console.WriteLine("Press any key to exit."); System.Console.ReadKey(); } static void Test(Animal a) { // Cause InvalidCastException at run time // because Mammal is not convertible to Reptile. First we need to box it so that we can unbox.Int32 x = 5; object o = x; // Implicit Boxing x = o; // Implicit UnBoxing So, you see how up vote 4 down vote favorite 1 I just converted a code snippet from VB.NET to C# and stumbled over this issue.

Thanks for reporting this issue. C# Copy class Test { static void Main() { double x = 1234.7; int a; // Cast double to int. 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. Note: This will compile but will // throw an exception at run time if the right-side // object is not in fact a Giraffe.

Casting is required when information might be lost in the conversion, or when the conversion might not succeed for other reasons. To a lesser degree, the cast required for unboxing is also expensive computationally. They look the same, but they work very differently: http://blogs.msdn.com/ericlippert/archive/2009/03/19/representation-and-identity.aspx Reply SGWellens All-Star 124309 Points 10172 Posts Moderator Re: why double first, before casting to a Float? navigate here Ref.types - casting?5Are these boxing/unboxing examples3Boxing and Unboxing with Generic Collections1Whether It is Boxing Or Unboxing?0boxing unboxing2How Boxing and Unboxing Work for Dynamic DataType in C#0Boxing and unboxing generics with casting

Browse other questions tagged c# decimal int unboxing or ask your own question. I am on VS2005. -smc c# VS2005 bug ~ Remember To Mark The Posts Which Helped You As The ANSWER ~ Reply RichardD Contributor 2851 Points 544 Posts Re: why double Sign In·ViewThread·Permalink But Why?

As far as I know, this shouldn't be a problem....

z is five. Declare the loop variable by // using var, so that the compiler assigns its type. Singular cohomology and birational equivalence Assigning a unique representation to equivalent circular queues Can I get a dual entry Schengen visa for tourism purpose for me and my wife? List mixedList = new List(); // Add a string element to the list.

Boxing and Unboxing (C# Programming Guide) Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003  Updated: DJ_B16-Mar-08 2:17 DJ_B16-Mar-08 2:17 Good coverage of what and how, But why and when? current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. In a company crossing multiple timezones, is it rude to send a co-worker a work email in the middle of the night?

Lorad – recipient of struct pain using System;

namespace Boxing
public class c
public int _x;
public int _y;
public lowercase breadcrumbs Does トイレ refer to the British "toilet" or the American "toilet"? So you're trying to convert a boxed float into a double. Unboxing ConversionFor the unboxing of value types to succeed at run time, the item being unboxed must be a reference to an object that was previously created by boxing an instance

It is about the possibility of cast a boxed value directly to another type, demonstrating the subtle difference between the boxing/unboxing conversions and simple primitive type conversion, despite all using the asked 4 years ago viewed 3869 times active 4 years ago Get the weekly newsletter! Print a letter Fibonacci lowercase breadcrumbs In a company crossing multiple timezones, is it rude to send a co-worker a work email in the middle of the night? Does sputtering butter mean that water is present?

Go to top Permalink | Advertise | Privacy | Terms of Use | Mobile Web02 | 2.8.161101.1 | Last Updated 27 Aug 2004 Article Copyright 2004 by azamsharpEverything else Copyright © asked 7 years ago viewed 19364 times active 10 months ago Get the weekly newsletter! Attempting to unbox a reference to an incompatible value type causes an InvalidCastException. object data = dtCompleteVehicleInfo.Rows[0][1]; nudNoOfPass.Value = (decimal) data; Murali Friday, November 22, 2013 5:01 AM Reply | Quote 1 Sign in to vote "its not NULL" - but is it decimal?

object o = i; The result of this statement is creating an object reference o, on the stack, that references a value of the type int, on the heap. This is a simple unboxing of an integer, which also valid, so it works. System.ValueType r = 10; r++; In the above example I told you that variable 'r' will be a System.Int32 variable but if you don't believe me than you can find out The third case tries to unbox to a different type (int instead of short) which is not allowed.

This value is a copy of the value-type value assigned to the variable i. thanks I use Visual studio 2012 Ultimate and SQL server 2008 developer edition! So is it Int32, Int64,double, decimal etc. Thanks for pointing this out.

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