How do I check if a string is null and set it to some value if it is?
Like in SQL,
isnull(string, 0)
Add a comment
|
3 Answers
You could test for null:
if (s == null)
s = "Hello";
or use the null coalescing operator:
string null_s = null;
string non_null_s = null_s ?? "Hello";
If you want to catch empty strings too, then you could use the IsNullOrEmpty test:
if (String.IsNullOrEmpty(s))
s = "Hello";
2 Comments
BoltClock
A little side note,
string.IsNullOrEmpty() would mean you can't use ??, only the if statement (or if-else).
Stuart
as another side note, if you're asking questions about "null", then it might be worth spending a little time on a C# primer/tutorial - just so you can understand the basics of what C# means by objects, references, instances, etc - each language is different (SQL is very different to C#) and reading up on a few basics might save you some from some frustration.
string myString = null;
string isNullString = myString == null ? "0" : myString;
Comments
If you are using .Net 4.0 you can use string.IsNullOrWhiteSpace method also.
