get output from string as passing parameter [Resolved]

Posted by Shoyebaziz123 under ASP.NET on 11/4/2015 | Points: 10 | Views : 1715 | Status : [Member] | Replies : 6

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Hello,
How to calculate "((a+b)*1000)/(c-d)*6)" by passing this string as parameter so that I can get exact output
String is variable
Here we can change a b c d with some integer or decimal value
How it can b done ?

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Posted by: Sheonarayan on: 11/4/2015 [Administrator] HonoraryPlatinum | Points: 50

0	Do it differently, even if you pass that string as parameter you may not get what you are looking for. So, create a function that accepts a, b, c, d as parameters and return the calculated value from that function. // declare function private string MyResult(int a, int b, int c, int d) { var result = ((a+b)1000)/(c-d)6); return result.ToString(); } // call now var myString = MyResult(2, 3, 4, 5); Thanks, hope this helps. Regards, Sheo Narayan http://www.dotnetfunda.com Shoyebaziz123, if this helps please login to Mark As Answer. \| Alert Moderator

Do it differently, even if you pass that string as parameter you may not get what you are looking for.

So, create a function that accepts a, b, c, d as parameters and return the calculated value from that function.

// declare function
private string MyResult(int a, int b, int c, int d)
{
    var result = ((a+b)*1000)/(c-d)*6);
    return result.ToString();
}
// call now
var myString = MyResult(2, 3, 4, 5);

Thanks, hope this helps.

Regards,
Sheo Narayan
http://www.dotnetfunda.com

Shoyebaziz123, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Shoyebaziz123 on: 11/4/2015 [Member] Starter | Points: 25

1	No , all of the things are dynamic Means user can input a formula Eg (a+ b)c) Through my code I can replace valuez of a b or c whatever Shoyebaziz123, if this helps please login to Mark As Answer*. \| Alert Moderator

Posted by: Rajnilari2015 on: 11/5/2015 [Member] [Microsoft_MVP] [MVP] Platinum | Points: 25

0	Try this using Microsoft.CSharp; using System; using System.CodeDom.Compiler; using System.Data; using System.Reflection; using System.Text; namespace ConsoleApplication5 { class Program { static void Main(string[] args) { // object result = Eval("((10 + 12)5)"); //result 110 object result = Eval("(((2+5)1000)/((30-12)6))"); //result 64 } private static object Eval(string sExpression) { CSharpCodeProvider c = new CSharpCodeProvider(); CompilerParameters cp = new CompilerParameters(); cp.ReferencedAssemblies.Add("system.dll"); cp.CompilerOptions = "/t:library"; cp.GenerateInMemory = true; StringBuilder sb = new StringBuilder(""); sb.Append("using System;\n"); sb.Append("namespace CSCodeEvaler{ \n"); sb.Append("public class CSCodeEvaler{ \n"); sb.Append("public object EvalCode(){\n"); sb.Append("return " + sExpression + "; \n"); sb.Append("} \n"); sb.Append("} \n"); sb.Append("}\n"); CompilerResults cr = c.CompileAssemblyFromSource(cp, sb.ToString()); if (cr.Errors.Count > 0) { throw new InvalidExpressionException( string.Format("Error ({0}) evaluating: {1}", cr.Errors[0].ErrorText, sExpression)); } Assembly a = cr.CompiledAssembly; object o = a.CreateInstance("CSCodeEvaler.CSCodeEvaler"); Type t = o.GetType(); MethodInfo mi = t.GetMethod("EvalCode"); object s = mi.Invoke(o, null); return s; } } } -- Thanks & Regards, RNA Team Shoyebaziz123, if this helps please login to Mark As Answer*. \| Alert Moderator

Try this

using Microsoft.CSharp;
using System;
using System.CodeDom.Compiler;
using System.Data;
using System.Reflection;
using System.Text;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {            
           // object result = Eval("((10 + 12)*5)"); //result 110
            object result = Eval("(((2+5)*1000)/((30-12)*6))"); //result 64
        }

        private static object Eval(string sExpression)
        {
            CSharpCodeProvider c = new CSharpCodeProvider();
            CompilerParameters cp = new CompilerParameters();

            cp.ReferencedAssemblies.Add("system.dll");

            cp.CompilerOptions = "/t:library";
            cp.GenerateInMemory = true;

            StringBuilder sb = new StringBuilder("");
            sb.Append("using System;\n");

            sb.Append("namespace CSCodeEvaler{ \n");
            sb.Append("public class CSCodeEvaler{ \n");
            sb.Append("public object EvalCode(){\n");
            sb.Append("return " + sExpression + "; \n");
            sb.Append("} \n");
            sb.Append("} \n");
            sb.Append("}\n");

            CompilerResults cr = c.CompileAssemblyFromSource(cp, sb.ToString());
            if (cr.Errors.Count > 0)
            {
                throw new InvalidExpressionException(
                    string.Format("Error ({0}) evaluating: {1}",
                    cr.Errors[0].ErrorText, sExpression));
            }

            Assembly a = cr.CompiledAssembly;
            object o = a.CreateInstance("CSCodeEvaler.CSCodeEvaler");

            Type t = o.GetType();
            MethodInfo mi = t.GetMethod("EvalCode");

            object s = mi.Invoke(o, null);
            return s;

        }
    }
}

--
Thanks & Regards,
RNA Team

Shoyebaziz123, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Rajnilari2015 on: 11/5/2015 [Member] [Microsoft_MVP] [MVP] Platinum | Points: 25

0	You can also try with Dynamic Expresso ( https://github.com/davideicardi/DynamicExpresso/ ) Dynamic Expresso is available on NuGet. You can install the package using: PM> Install-Package DynamicExpresso.Core Once done , then you can write the below using DynamicExpresso; namespace ConsoleApplication5 { class Program { static void Main(string[] args) { var interpreter = new Interpreter(); //var result = interpreter.Eval("((10 + 12)5)"); // result 110 var result = interpreter.Eval("(((2+5)1000)/((30-12)6))"); //result 64 } } } -- Thanks & Regards, RNA Team Shoyebaziz123, if this helps please login to Mark As Answer*. \| Alert Moderator

You can also try with Dynamic Expresso ( https://github.com/davideicardi/DynamicExpresso/ )

Dynamic Expresso is available on NuGet. You can install the package using:

PM> Install-Package DynamicExpresso.Core

Once done , then you can write the below

using DynamicExpresso;



namespace ConsoleApplication5

{

    class Program

    {

        static void Main(string[] args)

        {

            var interpreter = new Interpreter();            

            //var result = interpreter.Eval("((10 + 12)*5)"); // result 110

            var result = interpreter.Eval("(((2+5)*1000)/((30-12)*6))"); //result 64

        }

    }

}

--
Thanks & Regards,
RNA Team

Shoyebaziz123, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Rajnilari2015 on: 11/5/2015 [Member] [Microsoft_MVP] [MVP] Platinum | Points: 25

0	You can also try out the project "A C# Expression Evaluator " ( http://www.blackbeltcoder.com/Articles/algorithms/a-c-expression-evaluator ). Looks promising -- Thanks & Regards, RNA Team Shoyebaziz123, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Rajnilari2015 on: 11/25/2015 [Member] [Microsoft_MVP] [MVP] Platinum | Points: 25

0	You can also try this article http://www.dotnetfunda.com/articles/show/3174/evaluate-an-expression-at-runtime-using-ironjs -- Thanks & Regards, RNA Team Shoyebaziz123, if this helps please login to Mark As Answer. \| Alert Moderator

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