为什么我没有使用此 VB.NET 代码声明“Trim"? [英] Why am I getting 'Trim' is not declared with this VB.NET code?

问题描述

我正在尝试编译一个 VB.NET 应用程序.除了

...以及'IsNothing' 未声明.由于其保护级别，它可能无法访问."在这一行:

If IsNothing(memberList) = False Then

我不懂 VB，所以可能有一个简单的解决方案，但我不知道问题出在哪里.

解决方案

Trim 函数需要从程序集 Visual Basic 运行时库(在 Microsoft.VisualBasic.VisualBasic.dll)

通常最好使用字符串类中的原生 Trim 方法，而不是添加对此程序集的引用(主要用于帮助移植旧的 VB6 应用程序)

mail.CC.Add(addr.Trim())

另请注意，string.Trim 会删除其他空白字符作为制表符，而 Microsoft.VisualBasic 函数则不会.

I am trying to get a VB.NET app to compile. Besides the "elephant in the room", I'm also getting 7 "'Trim' is not declared" errors on code like this:

...as well as one "'IsNothing' is not declared. It may be inaccessible due to its protection level." on this line:

If IsNothing(memberList) = False Then

I don't know VB, so there may be a simple solution to this, but I have no clue what the problems are.

解决方案

The Trim function requires a reference to Microsoft.VisualBasic from the assembly Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)

Usually is preferable to use the native Trim method from the string class and not add a reference to this assembly (mainly used to help porting old VB6 apps)

mail.CC.Add(addr.Trim())

Notice also that the string.Trim removes other whitespace characters as tabs while the Microsoft.VisualBasic function does not.

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