VB.NET equivalent of C# "As"

What is the equivalent in VB.NET of the C# As keyword, as in the following?

var x = y as String;
if (x == null) ...

23057 次浏览

小开

Dim x = TryCast(y, [String])

小开

Dim x = TryCast(y, [String])

小开

TryCast:

Dim x = TryCast(y, String)
if (x Is Nothing) ...

小开

最佳答案

Dim x As String = TryCast(y, String)
If x Is Nothing Then ...

小开

Trycast is what you're looking for.

Dim x = TryCast(y, String)

小开

Here you go:

C# code:

var x = y as String;
if (x == null) ...

VB.NET equivalent:

Dim x = TryCast(y, String)
If (x Is Nothing) ...

小开

You can use it with ?:

TryCast(item, String)?.Substring(10)

It allows you to manage nullable without if :)