CODEWITHSUNDEEP
c#vb.net
Nikhil Agrawal
Nikhil Agrawal

Reputation: 48568

Why this error in VB.Net code which works fine in C# (after syntax changes)

I come from a C# background and have to now code in VB.Net (new job)

I am writing a code in VB.Net which works fine in C# (after syntax changes) but in VB.Net it gives error of Array bounds cannot appear in type specifiers.

C# Code

TimeSpan yesterday = new TimeSpan(1, 19, 0);

DateTime today = new DateTime(2012, 9, 4, 8, 48, 0);

DateTime ts = today.Add(new TimeSpan(9, 0, 0)).Subtract(yesterday);

VB.Net Code

Dim yesterday As New TimeSpan(1, 19, 0)

Dim today As New DateTime(2012, 9, 4, 8, 48, 0)

Dim ts As today.Add(New TimeSpan(9, 0, 0)).Subtract(yesterday)

It gives this error under New of 3rd line of VB code. Where am I wrong?

Upvotes: 6

Views: 207

Answers (2)

John Woo
John Woo

Reputation: 263723

you must explicitly declare the data type especially for "known" data types. Remember that Visual Basic is CASE INSENSITIVE

Dim ts As datetime = today.Add(New TimeSpan(9, 0, 0)).Subtract(yesterday)

but you can omit the datatype of the variable if have set

Option Infer ON

by default, it's ON

Upvotes: 1

sloth
sloth

Reputation: 101052

Dim ts As today.Add(New TimeSpan(9, 0, 0)).Subtract(yesterday)

should be

Dim ts = today.Add(New TimeSpan(9, 0, 0)).Subtract(yesterday)

or

Dim ts As DateTime = today.Add(New TimeSpan(9, 0, 0)).Subtract(yesterday)

When declaring a variable, you use As as type specifier.

Dim x As Int32
x = 10

or

Dim x As Int32 = 10

When assigning a value to the variable on the same line, you can omit the type specifier.

Dim x = 10

Because of this, I generally don't mix up As and New like this

Dim x As New FooBar()

as I think it is somewhat confusing. I prefer

Dim x = New Foobar()

Upvotes: 10

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