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Implicit data type conversion?

Implicit data type conversion?

Implicit data type conversion?


I'm going through the code written by another programmer some 5-6-7 years ago.
I came across some strange statements that, IMHO, must generate error, but apparently it does not do it coz the code works. In essence, it's a memvar declared as string and later assigned an Int value, e.g.

CODE --> vbnet

Dim BlaBlaBla As String = ""
' And later on
BlaBlaBla = 0 
I can't recall that VB6 allowed such implicit data type conversion, but apparently VB .NET 2012 does... or - does it?
Please educate me.



RE: Implicit data type conversion?

Yep, VB6 certainly used to allow it. And yes, VB.NET does it - still does it in VS2019. Option Strict On would catch this for you.

RE: Implicit data type conversion?

Hmm... I look at the Application.Designer, Resources.Designer and Settings.Designer - all three have Option Strict On... and this line of code is in the main cycle, it must have being executed, and it still ain't erring - ?



RE: Implicit data type conversion?

Just to be certain - Enabling Option Strict does not actually switch this on - it simply inserts Option Strict On in new modules. So, if the module (be it a code, form or class module) does not have the line Option Strict On at the top, then it isn't enforced. And when it IS enforced, it is a design time error, not a run time one.

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