VB.NET中的三元运算符语法问题

Question

I'm trying to use a ternary operator in vb.net but to determine what to append to a string but I am having issues with syntax...

Why does line three give an error on == generates expression expected error

Dim sb As New StringBuilder
Dim bln As Boolean
bln == true ? sb.append("True") : sb.Append("False")
' this also doesn't work
bln ? sb.append("True") : sb.Append("False")

Answer 1

The ternary operator in VB.NET is used like this:

If(<Test Statement>, <Result if True>, <Result if False>)

So you could do this:

sb.Append(If(bln, "True", "False"))

But this would be a better way to accomplish what you need:

sb.Append(CStr(bln))

Answer 2

On C based languages it use to be like:

String name = (person == null) ? "" : person.Name;

But in VB.Net it is like:

Dim name As String = If(person Is Nothing, "", person.Name)