Best and shortest way to evaluate mathematical expressions

by

Further to Thomas’s answer, it’s actually possible to access the (deprecated) JScript libraries directly from C#, which means you can use the equivalent of JScript’s eval function.

using Microsoft.JScript;        // needs a reference to Microsoft.JScript.dll
using Microsoft.JScript.Vsa;    // needs a reference to Microsoft.Vsa.dll

// ...

string expr = "7 + (5 * 4)";
Console.WriteLine(JScriptEval(expr));    // displays 27

// ...

public static double JScriptEval(string expr)
{
    // error checking etc removed for brevity
    return double.Parse(Eval.JScriptEvaluate(expr, _engine).ToString());
}

private static readonly VsaEngine _engine = VsaEngine.CreateEngine();

More Related Contents:

  1. lambda expression to sort on min values in a group
  2. converting a .net Func to a .net Expression
  3. Expression for Type members results in different Expressions (MemberExpression, UnaryExpression)
  4. Double to string conversion without scientific notation
  5. How costly is .NET reflection?
  6. Best way to compare two complex objects
  7. What exactly is an “open generic type” in .NET? [duplicate]
  8. What are attributes in .NET?
  9. How to read a large (1 GB) txt file in .NET?
  10. Requested registry access is not allowed
  11. Why must I provide explicitly generic parameter types While the compiler should infer the type?
  12. How to invoke a UI method from another thread
  13. How to select min and max values of a column in a datatable?
  14. GetMethod for generic method [duplicate]
  15. Bulk Update in C#
  16. get line number for XElement here
  17. Do interfaces derive from System.Object? C# spec says yes, Eric says no, reality says no
  18. How to correctly unregister an event handler
  19. Why is infinity printed as “8” in the Windows 10 console?
  20. Binding an enum to a WinForms combo box, and then setting it
  21. Use Task.Run() in synchronous method to avoid deadlock waiting on async method?
  22. Convert Transparent PNG to JPG with Non-Black Background Color
  23. Why does my .NET application crash when run from a network drive?
  24. Best way to update LINQ to SQL classes after database schema change
  25. Anonymous Type vs Dynamic Type
  26. itextsharp – CSS not getting applied – C# .NET
  27. Can’t await async extension method
  28. Should the folders in a solution match the namespace?
  29. IsAssignableFrom() returns false when it should return true
  30. How to make correct clone of the List? [duplicate]

Leave a Comment