How to get text and a variable in a messagebox

问题

I just need to know how to have plain text and a variable in a messagebox.

For example:

I can do this: MsgBox(variable)

And I can do this: MsgBox("Variable = ")

But I can't do this: MsgBox("Variable = " + variable)

回答1:

As has been suggested, using the string.format method is nice and simple and very readable.

In vb.net the " + " is used for addition and the " & " is used for string concatenation.

In your example:

MsgBox("Variable = " + variable)

becomes:

MsgBox("Variable = " & variable)

I may have been a bit quick answering this as it appears these operators can both be used for concatenation, but recommended use is the "&", source http://msdn.microsoft.com/en-us/library/te2585xw(v=VS.100).aspx

maybe call

variable.ToString()

update:

Use string interpolation (vs2015 onwards I believe):

MsgBox($"Variable = {variable}")

回答2:

Why not use:

Dim msg as String = String.Format("Variable = {0}", variable)

More info on String.Format

回答3:

I kind of run into the same issue. I wanted my message box to display the message and the vendorcontractexpiration. This is what I did:

Dim ab As String
Dim cd As String

ab = "THE CONTRACT FOR THIS VENDOR WILL EXPIRE ON "
cd = VendorContractExpiration


If InvoiceDate >= VendorContractExpiration - 120 And InvoiceDate < VendorContractExpiration Then

MsgBox [ab] & [cd], vbCritical, "WARNING"

End If

回答4:

MsgBox("Variable {0} " , variable)

来源：https://stackoverflow.com/questions/8630146/how-to-get-text-and-a-variable-in-a-messagebox

标签

vb.net

messagebox