get output from string as passing parameter [Resolved]

Posted by Shoyebaziz123 under ASP.NET on 11/4/2015 | Points: 10 | Views : 620 | Status : [Member] | Replies : 6
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

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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

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

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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


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

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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

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

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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

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

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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

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

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You can also try this article http://www.dotnetfunda.com/articles/show/3174/evaluate-an-expression-at-runtime-using-ironjs

--
Thanks & Regards,
RNA Team

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