vb.net Visual Basic .NET 中的自定义数字格式字符串
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Custom numeric format string in Visual Basic .NET
提问by edkalel
I'm trying to learn Visual Basic .NET step by step, but now I have a problem with a custom numeric format string using the String.Format() method.
我正在尝试逐步学习 Visual Basic .NET，但现在我遇到了使用 String.Format() 方法的自定义数字格式字符串的问题。
I have an Integer variable like this
我有一个像这样的整数变量
Dim x As Integer = 123456
Dim x As Integer = 123456
and I want to format it to 1,234.56 with the String.Format() method. I believed that the following was the correct format but it doesn't work:
我想使用 String.Format() 方法将其格式化为 1,234.56。我认为以下是正确的格式，但它不起作用：
String.Format("#,###.##", x)
String.Format("#,###.##", x)
What is the correct format string to get the result that I need?.
获得我需要的结果的正确格式字符串是什么？
回答by kdnooij
As an alternative to what Plutonix is saying, you could do it using a simple function:
作为 Plutonix 所说的替代方案，您可以使用一个简单的函数来完成：
Public Function FormatInt(format As String, arg As Integer) As String
Dim ArgString As String = arg.ToString
Dim Result As String = ""
Dim FormatIndex As Integer = 0
For i As Integer = 0 To format.Length - 1
If format.Substring(i, 1) = "#" Then
Result = Result + ArgString.Substring(FormatIndex, 1)
FormatIndex = FormatIndex + 1
Else
Result = Result + format.Substring(i, 1)
End If
Next
Return Result
End Function
This might not be the best solution, but it is very simple to use:
这可能不是最好的解决方案，但使用起来非常简单：
Dim x As Integer = 123456
FormatInt("#,##.##",x)
Too make it work the other way around (reverse it) you can just reverse the process. It doesn't work like the String.Format() method does, but I believe it suits your needs
太让它以相反的方式工作（逆转它），你可以逆转这个过程。它不像 String.Format() 方法那样工作，但我相信它适合您的需求
回答by Hamied
x.tostring("n2")
It will display your result as 123,456.00 in your example above.
在上面的示例中，它会将您的结果显示为 123,456.00。
Not you can use N or N0 up to any digit you want like N2 , N3 , ....
不是你可以使用 N 或 N0 到任何你想要的数字，比如 N2 ， N3 ，....
