CODEWITHSUNDEEP
stringvb.netexpression
codiee
codiee

Reputation: 31

Expressing a String

I cannot find a way to express a string. So for example if I type the string " ""Hello "" & 10*20/(21/2) & "" World"" " In a Textbox control or Console.ReadLine() input it should return Hello 19,0476190476191 World. Can I do this?

Upvotes: 0

Views: 86

Answers (1)

Heinzi
Heinzi

Reputation: 172270

If you use single quotes and + as the string concatenation character, you can abuse the expression evaluation engine of ADO.NET:

Dim expression As String = " 'Hello ' + 10*20/(21/2) + ' World' "
Dim result = New DataTable().Compute(expression, Nothing)

' Prints: Hello 19.047619047619 World
Console.WriteLine(result)

The DataColumn.Expression MSDN page has a list of all supported operators.

(On the other hand, writing a simple Basic expression parser is always a fun exercise, so don't let that stop you.)

Upvotes: 2

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