C＃之后的“ New SomeClass {Key .SomeProperty = SomeValue}”中的语法错误。 VB转换 [英] Syntax error in `New SomeClass { Key .SomeProperty = SomeValue }` after C# -> VB conversion

问题描述

我和我的一位同事都在编程。他用C＃上了一堂课，我正在将其转换为VB.NET。我得到了完整的类的转换，除了一行以外，这时我无法弄清楚，所以以为新的眼睛也许可以找到我的错误。

原始C＃代码

 使用（var client = new HttpClient（new HttpClientHandler {AutomaticDecompression = DecompressionMethods.GZip | | DecompressionMethods.Deflate}））
  

已转换的VB.NET代码

 使用客户端=新HttpClient（新的HttpClientHandler与{Key .AutomaticDecompression = DecompressionMethods.GZip或DecompressionMethods.Deflate }）
  

错误
字段名称或在对象初始化中初始化的属性必须以。开头。

错误位于键下

最后的注意：：我大部分使用了可怕的代码转换器，所以我不确定键在哪里来自。

解决方案

有两个概念具有相似的语法但语义不同：

匿名类型

C＃：新{A = 1，B = 2}

VB：新增了{键.A = 1，键.B = 2}

在这里， VB 也允许您添加可变（非关键）属性，而 C＃不支持：

新增了{键.A = 1，键.B = 2，.SomeMutableProperty = 3}

因此，键关键字在这里很重要。

命名类型的对象初始化程序

C＃： new MyClass {A = 1，B = 2}

VB： New MyClass With {.A = 1，.B = 2}

此处， MyClass的现有属性设置，因此 Key 关键字是不相关的，因此是不允许的。

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显然，您的C＃-> VB转换器认为这是一个匿名类型，尽管它是对象初始化程序。删除 Key 关键字，并将错误报告发送给转换器的开发人员。

A co-worker of mine and I both do programming. He has made a class in C# and I am working on converting it to VB.NET. I got the full class converted except for a single line, and at this point I cannot figure it out so thought a fresh set of eyes maybe able to find my error.

Original C# code

using (var client = new HttpClient(new HttpClientHandler { AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate })) 

Converted VB.NET code

Using client = New HttpClient(New HttpClientHandler With {Key .AutomaticDecompression = DecompressionMethods.GZip Or DecompressionMethods.Deflate})

Error Name of field or Property being initialized in an object initialize must start with '.'.

Error is located under the 'Key'

Last note: I used a dreaded code-converter for most of it, so I am unsure where 'key' came from.

解决方案

There are two concepts which have similar syntax but different semantics:

Anonymous Types

C#: new { A = 1, B = 2 }

VB: New With { Key .A = 1, Key .B = 2 }

Here, VB also allows you to add mutable (non-key) properties, which C# does not support:

New With { Key .A = 1, Key .B = 2, .SomeMutableProperty = 3 }

Hence, the Key keyword is important here.

Object Initializers for Named Types

C#: new MyClass { A = 1, B = 2 }

VB: New MyClass With { .A = 1, .B = 2 }

Here, existing properties of MyClass are set, so the Key keyword is irrelevant, and, thus, not allowed.

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Apparently, your C# -> VB converter thought that this was an anonymous type, although it was an object initializer. Remove the Key keyword and send a bug report to the converter's developer.

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