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I have been looking for any tip or idea about to Compute Enumerables using a String Expression, I mean by compute to execute operations like Min, Max, Average and Sum.

I am looking for something like This..

    // PARAMETER MODEL
    public class Parameter
    {
        public string Name { get; set; }
        public double Price1 { get; set; }
        public double Price2 { get; set; }
        public double Price3 { get; set; }
        public double Price4 { get; set; }
    }

    // GETS AN ENUMERABLE COLLECTION OF PARAMETERS
    IEnumerable<Parameter> currentParameters = ParameterCreator.GetParameters();

    // HERE IS MY QUESTION
    double maxPrice = currentParameters.Compute("MAX[Price2]");

Where Price2 String Expressions indicates a property in Parameter Class. MAX a Compute through Price2 parameter on the Enumerable Collection. And Compute, a dummy extension method on any package or framework.

Does anyone has any idea whether there is any package, framework or anything to achieve this?

Thank you for your help.

Carlos Rangel
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  • You'll need to write a parser for your simple language and a visitor to interpret it. You can use something like Sprache for this. However, this smells a lot like an XY problem. Depending on your use case (is the instruction coming from a user, perhaps over the wire? do all "operations" involve reducing a list to a single element?), this can be solved in a number of simpler ways, such as passing delegates or lambda expressions, or a simple switch over an enum. – Asad Saeeduddin Oct 25 '17 at 02:30
  • You could dust off the old [Dynamic LINQ](https://github.com/kahanu/System.Linq.Dynamic/wiki/Dynamic-Expressions) library. – Mike Strobel Oct 25 '17 at 02:32
  • `List` has a max method: `var list = new List { 1, 2, 3 };var max = list.Max(x => x);`. Wouldn't that do? – CodingYoshi Oct 25 '17 at 02:43

0 Answers0