Can ternary conditional expressions be represented in the CodeDOM?

  • Thread starter Thread starter Guest
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G

Guest

.... I know I could use a CodeSnippetExpression to do it, but that would
somewhat hardcode the resulting tree. I was looking for something like:

CodeTernaryExpression(
CodeExpression test,
CodeExpression trueExpression,
CodeExpression falseExpression);

Which would, of course, get turned into the corresponding:

(test ? trueExpression : falseExpression)

expression in C#, C++, or even J# (I believe). I guess it's only VB.NET
that doesn't have a ternary expression but I don't know for sure.


I know, I know, for generated code there's no real reason to use a ternary
expression, but coding habits are hard to break, even when writing meta-code
:-)

Regards,
-- TB
 
I guess it's only VB.NET
that doesn't have a ternary expression but I don't know for sure.
Click to expand...

VB does have such an expression, it is IIF. Be advised that the semantics
are different - both the true and false expressions are evaluated regardless
of the value of the test expression.
 
... I know I could use a CodeSnippetExpression to do it, but that would
somewhat hardcode the resulting tree. I was looking for something like:

CodeTernaryExpression(
CodeExpression test,
CodeExpression trueExpression,
CodeExpression falseExpression);

Which would, of course, get turned into the corresponding:

(test ? trueExpression : falseExpression)

expression in C#, C++, or even J# (I believe). I guess it's only VB.NET
that doesn't have a ternary expression but I don't know for sure.

I know, I know, for generated code there's no real reason to use a ternary
expression, but coding habits are hard to break, even when writing meta-code
:-)

Regards,
-- TB
Click to expand...

There are more surprising ommissions from the CodeDom than ternary
expressions - things you would expect to find in ANY language (and as
AMercer pointed out, VB does have IIF).

For instance, try looking for:
Unary Minus
Xor
Value Inequality

Or try generating a while loop. Or a lock expression (Synclock in VB).
Or a Negative test (If Not xxxxx in VB/if(!xxxxx) in C#)

Damien
 
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