使用 C# 中的 DataTable 计算异或表达式

Question

I want to calculate a logical expression like (true xor false) I used DataTable but it dose not support xor . How can I calculate xor expressions?

System.Data.DataTable table = new System.Data.DataTable();
var result = table.Compute("( False xor True) ", "");

Answer 1

You are trying to parse a string containing a C# logical expression. There are multiple ways of doing it:

1. Since your logical expression only uses different combinations of true , false , and , or and xor , with parenthesis, you could roll out your own parser. Should be a pretty slim function.

2. If you're using this in the context of a DataTable as evident from the question tags, there is a built-in function called Compute that can take simple expressions and evaluate them for you. XOR is not available by default in the list of supported operators, but you could write an equivalent expression using not equal to operator (<>). Remmber A ^ B is equivalent to (A <> B) in the context of DataTable's boolean expresions.

3. You could use Roslyn's built-in capabilities and parse and evaluate literally any C# expression at runtime.