在 VB.NET 字符数组中添加“c”有什么作用？
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What does adding a "c" do in a VB.NET character array?
提问by n00b
I would like to use the String method IndexOfAny to check if a character exists in a specified string.
我想使用 String 方法 IndexOfAny 来检查指定字符串中是否存在字符。
Examples I've found online, of using the IndexOfAny method include a "c" after each character in the character array when using VB.NET. However, when I look at examples of simple character arrays in VB.NET, I dont see any such "c" after each character. What does the "c" do? Is it optional?
我在网上找到的使用 IndexOfAny 方法的示例在使用 VB.NET 时在字符数组中的每个字符后面都包含一个“c”。但是，当我查看 VB.NET 中简单字符数组的示例时，我没有在每个字符后看到任何这样的“c”。“c”有什么作用？它是可选的吗？
Dim s1 As String = "Darth is not my father."
' Find the first index of either "x" or "n"
Dim i1 As Integer = s1.IndexOfAny(New Char() {"x"c, "n"c})
回答by vcsjones
That is a suffix for a literal of type System.Char. So
这是 System.Char 类型文字的后缀。所以
Dim foo As Char = "x"c
Will compile (when Option Strict is set to either On or Off). Without the c, it would be interpreted as a string. For more information about literal suffixes in VB.NET, take a look at the MSDN page, "Constant and Literal Data Types".
将编译（当 Option Strict 设置为 On 或 Off 时）。如果没有c，它将被解释为字符串。有关 VB.NET 中文字后缀的更多信息，请查看 MSDN 页面“常量和文字数据类型”。
