How to get null keyword via Codedom

[Tim Haughton]

Hi, I'm writing some CodeDom stuff at the minute. It's great fun but
I've hit a snag. A little bit of the code checks to see whether an
event is null before I fire it. It looks like this...

......Some stuff

CodeConditionStatement ifEventIsntNull = new CodeConditionStatement();
CodeEventReferenceExpression eventRef = new
CodeEventReferenceExpression(new
CodeTypeReferenceExpression("Interation"),
"NewInterationFailure");

CodeSnippetExpression nullExp = new CodeSnippetExpression("null");

CodeBinaryOperatorExpression equalityEx = new
CodeBinaryOperatorExpression(eventRef,
CodeBinaryOperatorType.IdentityInequality, nullExp);
ifEventIsntNull.Condition = equalityEx;

method.Statements.Add(ifEventIsntNull);
The problem is I can't see how to check for null without using the
CodeSnippetExpression (which obviously isn't portable). Anyone throw me
a line?

Cheers,

Tim

[Christof Nordiek]

What about:
new CodeDefaultValueExpression(new CodeTypeReference(typeof(object)))

"Tim Haughton" <ti*********@gmail.comschrieb im Newsbeitrag
news:11*********************@k70g2000cwa.googlegro ups.com...

Hi, I'm writing some CodeDom stuff at the minute. It's great fun but
I've hit a snag. A little bit of the code checks to see whether an
event is null before I fire it. It looks like this...

.....Some stuff

CodeConditionStatement ifEventIsntNull = new CodeConditionStatement();
CodeEventReferenceExpression eventRef = new
CodeEventReferenceExpression(new
CodeTypeReferenceExpression("Interation"),
"NewInterationFailure");

CodeSnippetExpression nullExp = new CodeSnippetExpression("null");

CodeBinaryOperatorExpression equalityEx = new
CodeBinaryOperatorExpression(eventRef,
CodeBinaryOperatorType.IdentityInequality, nullExp);
ifEventIsntNull.Condition = equalityEx;

method.Statements.Add(ifEventIsntNull);
The problem is I can't see how to check for null without using the
CodeSnippetExpression (which obviously isn't portable). Anyone throw me
a line?

Cheers,

Tim