VB.NET 中声明数组的不同方式
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Different ways of declaring arrays in VB.NET
提问by Enrique
In VB.NET, is there any difference between the following ways of declaring arrays?
在VB.NET中，以下声明数组的方式有什么区别吗？
- Dim cargoWeights(10) as Double
- cargoWeights = New Double(10) {}
' These are two independent statements. They are not supposed to execute one after the other.
'这是两个独立的声明。他们不应该一个接一个地执行。
As far as I know, the first one just declares an array variable that holds the value 'Nothing' until some array object is assigned to it. In other words, it is not initialized yet.
据我所知，第一个只是声明了一个数组变量，该变量保存值“Nothing”，直到将某个数组对象分配给它。换句话说，它还没有被初始化。
But what about the second statement? Does the "=" sign means the variable is already being initialized and won't hold 'Nothing'? Is it going to point to an one-dimensional array of eleven default Double values (0.0)?
但是第二个语句呢？“=”符号是否表示该变量已经被初始化并且不会保存“Nothing”？它会指向一个包含 11 个默认 Double 值 (0.0) 的一维数组吗？
EDIT:
编辑：
According to MSDN website:
根据 MSDN 网站：
The following example declares an array variable that does not initially point to any array.
Dim twoDimStrings( , ) As String
(...) the variable twoDimStrings has the value Nothing.
下面的示例声明了一个最初不指向任何数组的数组变量。
Dim twoDimStrings( , ) As String
(...) 变量 twoDimStrings 的值为 Nothing。
Source: http://msdn.microsoft.com/en-us/library/18e9wyy0(v=vs.80).aspx
来源：http: //msdn.microsoft.com/en-us/library/18e9wyy0(v=vs.80).aspx
回答by ajakblackgoat
Both Dim cargoWeights(10) as Doubleand cargoWeights = New Double(10) {}will actually initialize an array of doubles with each items set to default type value, which in this case, 0.0. (Or Nothing if Stringdata type)
二者Dim cargoWeights(10) as Double并cargoWeights = New Double(10) {}实际上将初始化双打的设置为默认类型值各项目中，阵列在这种情况下，0.0。（或者如果String数据类型为空）
The difference between the two syntax is that, the 2nd one you can init the value of each items in the array to different from default value, like:
两种语法的区别在于，第二种语法可以将数组中每个项目的值初始化为与默认值不同的值，例如：
cargoWeights = New Double(10) {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}
To declare uninitialized array, use Dim cargoWeights() As Doubleor cargoWeights = New Double() {}.
要声明未初始化的数组，请使用Dim cargoWeights() As Double或cargoWeights = New Double() {}。
