VB中的多重分配，例如C风格的语言 [英] Multiassignment in VB like in C-Style languages

问题描述

是否可以像在C-Style语言中那样在VB.NET中执行此操作？

Is there a way to perform this in VB.NET like in the C-Style languages:

struct Thickness
{
    double _Left;
    double _Right;
    double _Top;
    double _Bottom;

    public Thickness(double uniformLength)
    {
        this._Left = this._Right = this._Top = this._Bottom = uniformLength;
    }
}

推荐答案

扩展在马克的正确答案上

Expanding on Mark's correct answer

这种类型的分配样式在VB.Net中是不可能的。代码的C＃版本有效，因为在C＃赋值中是一个产生值的表达式。这就是为什么可以这种方式链接它的原因。

This type of assignment style is not possible in VB.Net. The C# version of the code works because in C# assignment is an expression which produces a value. This is why it can be chained in this manner.

在VB.Net中，赋值是语句而不是表达式。它不产生任何值，并且不能更改。实际上，如果您将代码 a = b作为表达式编写，它将被视为值比较而不是赋值。

In VB.Net assignment is a statement and not an expression. It produces no value and cannot be changed. In fact if you write the code "a = b" as an expression it will be treated as a value comparison and not an assignment.

Eric最近关于C＃的博客文章

Eric's recent blog post on this subject for C#

• http：//blogs.msdn .com / ericlippert / archive / 2010/02/11 / chaining-simple-assignments-is-not-so-simple.aspx

• http://blogs.msdn.com/ericlippert/archive/2010/02/11/chaining-simple-assignments-is-not-so-simple.aspx

在语言级别，分配是语句而不是表达式。

At a language level assignment is a statement and not an expression.

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