为什么VB.Net代码中的这个错误在C#中运行良好(语法更改后)

Question

我来自C#背景,现在必须在VB.Net中编写代码(新工作)

我在VB.Net中编写一个代码,它在C#中运行良好(在语法更改之后),但在VB.Net中它给出了错误Array bounds cannot appear in type specifiers.

C#代码

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代码

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)

它在NewVB代码的第3行下给出了这个错误.我哪里错了？

Answer 1

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

应该

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

要么

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

声明变量时,使用As类型说明符.

Dim x As Int32
x = 10

要么

Dim x As Int32 = 10

为同一行的变量赋值时,可以省略类型说明符.

Dim x = 10

正因为如此,我一般不混淆As和New这样的

Dim x As New FooBar() 

因为我认为这有点令人困惑.我更喜欢

Dim x = New Foobar()