CODEWITHSUNDEEP
c#casting
BudBrot
BudBrot

Reputation: 1411

Casting with a variable Type

I try to cast a variable type of Object int to a var.

My try is:

var dummy = (items[items.Count() - 1].GetType()) items[items.Count()-1];

I dunno what I'm doing wrong, i cant see my error, but the debugger says that only assign, decrement and "new Object"-expressions can be used as a command... But that's what I'm doing...

Can somebody show me my error? Many thanks in advance, and sorry for that "beginnerquestion".

Upvotes: 0

Views: 188

Answers (3)

Sam I am says Reinstate Monica
Sam I am says Reinstate Monica

Reputation: 31184

Here's the source of the error you're experiencing.

Your compiler sees (items[items.Count() - 1].GetType()) as an expression, rather than a casting statement, so what it sees is 

getAValue() (items[items.Count() - 1].GetType())

which doesn't make any sense.

you should cast your variable as others have said.

Upvotes: 1

CodingGorilla
CodingGorilla

Reputation: 19842

Casting is a compile type operation, you're telling the compiler: "This object is a [insert type here]". GetType() is a runtime method that returns a specific type (the type Type). So there are a couple of problems, you cannot use the runtime method in a compile time construct. Second, you would actually in this case be casting (assuming this was possible) to Type rather than say String (assuming GetType() returned String).

I'm not sure what you're trying to accomplish, but this is probably what you want to do: http://msdn.microsoft.com/en-us/library/dtb69x08.aspx

Also, I think you might not be understanding what var is (based on some of your comments). You "cast things to var", var is essentially a shortcut which allows the compiler to infer the type. So something like this:

var myString = "this is a test";

Is the equivalent of:

string myString = "this is a test";

Upvotes: 1

Adil
Adil

Reputation: 148110

You need to use Convert.ChangeType

var obj = Convert.ChangeType(d, items[items.Count() - 1].GetType());

Upvotes: 2

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