Home > Cannot Be > Type Of Conditional Expression Cannot Be Determined Because

Type Of Conditional Expression Cannot Be Determined Because

Contents

number = true ? 5 : null as int?; –Brad M Aug 15 '13 at 19:49 Nice answer nailing the point. I also have a problematic line of code where the console returns statistics on the user. Browse other questions tagged c# conditional-operator nullable or ask your own question. x = GetBoolValue() (int?)10 : null; share|improve this answer answered May 13 '09 at 14:00 Justin Niessner 180k19303438 add a comment| up vote 3 down vote int? this contact form

asked 4 years ago viewed 858 times active 4 years ago Upcoming Events 2016 Community Moderator Election ends Nov 22 Related 47C# ADO.NET: nulls and DbNull — is there more efficient Calculating ...5(5+4(4+3(3+2(2+1(1))))) MathSciNet review alert? null : new DateTime(0); The latter form gives me an compile error "Type of conditional expression cannot be determined because there is no implicit conversion between '' and 'System.DateTime'." Not that Does calling a function that mutates static local variables twice in the same expression lead to undefined behavior? click to read more

Type Of Conditional Expression Cannot Be Determined Dbnull

OBDII across the world? share|improve this answer answered May 13 '09 at 14:00 Daniel Brückner 44.4k868121 add a comment| up vote 3 down vote It's because the compiler determines the type of the conditional operator If there isn't an implicit conversion then you'll get an error. –LukeH May 13 '09 at 15:07 4 Indeed, one of the subtle but important design principles used throughout C# Notice that these variants DO work, and it may help you understand: object someValue = true ?

  1. As an example GetBoolValue() ? (IFormattable)10 : null // #1B or GetBoolValue() ? 10 : (IFormattable)null // #2B will be OK.
  2. x = GetBoolValue() ? 10 : (int?)null; The reason you see this is because behind the scenes you're using Nullable and you need to tell C# that your "null" is a
  3. 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
  4. OBDII across the world?
  5. Let X and Y be the types of the second and third operands.
  6. Professor Lewin: "Which string will break?" / Me: "That one." / Professor Lewin: "Wrong!" Is there an actual army in 1984?
  7. Note that another possibility would be to box the int 10 to a base class or interface of System.Int32.
  8. Is it possible to hand start modern planes?

Join them; it only takes a minute: Sign up Type of conditional expression cannot be determined because there is no implicit conversion between 'int' and up vote 60 down vote number = true ? 5 : (int?)null; but now we have to read a different clause in the spec to understand why this is okay: If x has type X and 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 No Implicit Conversion Between 'system.dbnull' And 'string' share|improve this answer edited Apr 7 '13 at 22:28 answered Apr 7 '13 at 21:46 Mishax 2,19531943 add a comment| Your Answer draft saved draft discarded Sign up or log

Furniture name for waist-high floor-sitting shelf cabinet thing Possible repercussions from assault between coworkers outside the office Does calling a function that mutates static local variables twice in the same expression There Is No Implicit Conversion Between Int And Null 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 Not the answer you're looking for? http://stackoverflow.com/questions/9067770/c-sharp-ado-net-type-of-conditional-expression-cannot-be-determined-because-ther in a single line Related 39Conditional operator assignment with Nullable types?38Why is this code invalid in C#?101Nullable type issue with ?: Conditional Operator2701Does Python have a ternary conditional operator?163Nullable types and

How does Gandalf end up on the roof of Isengard? C# Null Conditional Operator Safety - Improve braking power in wet conditions Why does Cutie act like this and lesser robots listen to it? Putty 1,4631615 add a comment| up vote 4 down vote See also Why is this code invalid in C#? Because both wrapping and boxing are normally implicit conversions.

There Is No Implicit Conversion Between Int And Null

share|improve this answer answered Aug 14 '14 at 10:28 Jon Skeet 906k48965777500 thanks for the advice –Stefan Alexander Aug 14 '14 at 10:32 add a comment| Your Answer never knew that. Type Of Conditional Expression Cannot Be Determined Dbnull Otherwise, assign null to the nullable int. Type Of Conditional Expression Cannot Be Determined Because Implicitly Convert To One Another My boss asks me to stop writing small functions and do everything in the same loop Isn't AES-NI useless because now the key length need to be longer?

However, the compiler complains: Error 1 Type of conditional expression cannot be determined because there is no implicit conversion between int and . weblink instead of Nullable. –Stewart Johnson Nov 17 '08 at 15:24 add a comment| 5 Answers 5 active oldest votes up vote 215 down vote accepted This question has been asked a At least it keeps you from having to litter your code with magic values (I contend that null/zero/false/etc. How is the correct air speed for fuel combustion obtained at the inlet of the combustor? No Implicit Conversion Between 'system.dbnull' And 'int'

There is no implicit conversion from int? If it is the last line of code (excluding brackets) then it is exactly the problem it says: your two alternatives are String.Format, which is of type string or 0 which as well and had the same effect. http://rinfix.com/cannot-be/type-of-conditional-expression-cannot-be-determined-dbnull.html Used like this: // Left hand is the nullable type, righthand is default if the type is null.

Two-way high power outdoor Wi-Fi What is the meaning of ''cry oneself"? Object Cannot Be Cast From Dbnull To Other Types I am seen in darkness and in light, What am I? won't compile Hot Network Questions Given the hints solve the puzzle Straight line equation Is there an actual army in 1984?

I also cannot format currency in my grid because I am pivoting my data and must have autogenerate columns set to true.

type : (byte)0 share|improve this answer answered Apr 2 '11 at 18:14 Femaref 48.4k391132 That makes sense. Not the answer you're looking for? What episode of Star Trek is this creature on? Nullable Object Must Have A Value You have two ways of solving that: First is to make null compatible with DateTime (for instance, cast null to DateTime?

Limit computation technology in a futuristic society Will I get the same result if I use 18-55mm lens at 55mm (full zoom) and 55-200mm lens at 55mm (no zoom), if not, You could have just as easily casted the 10 to int? How do unlimited vacation days work? his comment is here Not the answer you're looking for?

x = GetBoolValue() ? 10 : new int?(); –Eniola Jun 20 at 19:17 add a comment| up vote 4 down vote The problem is that the ternary operator is inferring type If the project Notes popup requests notes, I should exclude collection notes. How to capture disk usage percentage of a partition as an integer? ResultofSomeCalc() : (int?)null; It seems to me that the compiler has all the information it need to make an implicit casting decision, no?

When does TNG take place in relation to DS9? How do I deal with my current employer not respecting my decision to leave? GetBoolValue() ? (int?)10 : null // #1 GetBoolValue() ? 10 : (int?)null // #2 GetBoolValue() ? 10 : default(int?) // #3 share|improve this answer edited Apr 29 at 8:45 snijhof 3711 This is just an example.

How good should one be to participate in PS? It finds and DateTime and instead of finding the common ancestor type, it just tries to find a conversion between each other. (Extra bit: C# recognizes a type, i.e. The second is to make the DateTime compatible with null (for instance, cast DateTime to DateTime?). Since the compiler implictitly decides that 10 is an int it then decides that the return type of this expression shall be an int as well.

Here x is an int literal, and y is null which does not have a type and null is not implicitly convertible to an int1.