What is the operator precedence of C# null-coalescing (??) operator?

Question

I\'ve just tried the following, the idea being to concatenate the two strings, substituting an empty string for nulls.

string a=\"Hello\";
string b=\" World\         


        

Answer 1

It interesting that http://msdn.microsoft.com/en-us/library/6a71f45d.aspx and http://en.csharp-online.net/ECMA-334:_14.2.1_Operator_precedence_and_associativity give different precedence to ??.

msdn:

1. Conditional
2. Assignment
3. Null-coalescing
4. Lambda

ECMA:

1. Null Coalescing
2. Conditional
3. Assignment

I think the msdn must be wrong, consider:

string a = null;
string b = a ?? "foo";
// What is b now?