与 C# 7 等效的 VB.NET 是运算符声明模式 [英] VB.NET equivalent for the C# 7 is operator declaration pattern

问题描述

是否有与 C#7 是运算符声明模式?特别注意以下代码示例中的 bmp:

Is there a VB.NET equivalent to the C# 7 is operator declaration pattern? Note in particular the bmp in the following code sample:

public void MyMethod(Object obj)
{
    if (obj is Bitmap bmp)
    {
        // ...
    }
}

或者is的短模式匹配语法是C#独有的?

Or the short pattern matching syntax with is is exclusive to C#?

我已经知道这些语法:

    If TypeOf obj Is Bitmap Then
        Dim bmp As Bitmap = obj
        ' ...
    End If

或

    Dim bmp As Bitmap = TryCast(obj, Bitmap)
    If bmp IsNot Nothing Then
        ' ...
    End If

我想知道是否有更短的内容，例如 新的 C#7 是运算符声明模式...

What I want to know is whether there is something even shorter, like that new C#7 is operator declaration pattern...

非常感谢.

推荐答案

目前，没有.如果您想实现这一点，则必须使用您在问题中已经提到的一些较长的格式.

Currently, no. If you want to implement this, you'll have to use some of the longer formats you already mention in your question.

C# 和 VB 语言并不总是具有相同的功能.

The C# and VB languages don't always have equivalent features.

这篇关于与 C# 7 等效的 VB.NET 是运算符声明模式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！