什么是这两个数组声明之间的区别？ [英] What is difference between these two array declarations?

问题描述

看来这两个声明是一样的：

It seems these two declarations are the same:

int[] array1 = {11, 22, 33};

和

int[] array2 = new int[] {11, 22, 33};

但什么是这部分新INT [] 第二个样本中？结果
这会让区别？

But what is the need of this part new int[] in the second sample?
Does it make difference?

推荐答案

有在无差异这种情况下 - 但是第一个语法的只有可用声明变量时。从C＃4规格12.6节：

There's no difference in this case - but the first syntax is only available when declaring a variable. From the C# 4 spec section 12.6:

数组初始化函数可以在域声明，局部变量声明和数组创建表​​达式来指定

Array initializers may be specified in field declarations, local variable declarations, and array creation expressions.

（将数组初始化是在括号中的位 - 和一个数组创建表​​达式中可指定表格新的INT [] 或什么的。）

(The "array initializer" is the bit in braces - and an array creation expression is the form where you specify new int[] or whatever.)

当你不声明一个局部变量或字段（例如，如果你传递一个参数的方法），你必须使用第二种形式，或者从C＃3.0，你可以使用隐式类型数组：

When you're not declaring a local variable or a field (e.g. if you're passing an argument to a method) you have to use the second form, or from C# 3.0 you can use an implicitly typed array:

Foo(new[] { 1, 2, 3} );

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