Getting Started

Installation

Install the following nuget package :

Install-Package CodingSeb.ExpressionEvaluator

See on Nuget.org

or copy the CodingSeb.ExpressionEvaluator/ExpressionEvaluator.cs file in your project :

Basic C# usage

Simple expressions

using CodingSeb.ExpressionEvaluator;
//...
string expression;
//...
ExpressionEvaluator evaluator = new ExpressionEvaluator();
Console.WriteLine(expression);
Console.WriteLine(evaluator.Evaluate(expression));

Results with some expressions :
Live examples here

1+1
2

2 + 3 * 2
8

(2 + 3) * 2
10

Pi
3.14159265358979

Pow(2, 4)
16

Sqrt(2) / 3
0.471404520791032

"Hello" + " " + "World"
Hello World

Max(1+1, 2+3, 2*6, Pow(2, 3))
12

Array(2, $"Test { 2 + 2 } U", true).Length
3

Array(2, $"Test { 2 + 2 } U", true)[1]
Test 4 U

Array(2, $"Test { 2 + 2 } U", true)[2] ? "yes" : "no"
yes

false ? "yes" : "no"
no

"Hello\nWorld"
Hello
World

@"Hello\nWorld"
Hello\nWorld

Regex.Match("Test 34 Hello/-World", @"\d+").Value
34

int.Parse(Regex.Match("Test 34 Hello/-World", @"\d+").Value) + 2
36

3 / 2
1

3d / 2d
1.5

(float)3 / (float)2
1.5

// use new as a function
new(Random).Next(1,10)
4 // or a random value between 1 and 9

// or as a keyword
new Regex(@"\w*[n]\w*").Match("Which word contains the desired letter ?").Value
contains

List("Test", "Hello", "Bye", "How are you?").Find(t => t.Length < 4)
Bye

new List<string>(){ "Test", "Hello", "Bye", "How are you?" }.Find(t => t.Length < 4);
Bye

Enumerable.Range(1,4).Cast().Sum(x =>(int)x)
10

Enumerable.Repeat(3,6).Cast().ToList().Count
6

Enumerable.Repeat(3,6).Cast().ToList()[4]
3

((x, y) => x * y)(4, 2)
8

"Hello"[2] == 'l'
true

"Hello,Test,What".Split(ArrayOfType(typeof(char), ',')).Length
3

"Hello,Test,What".Split(ArrayOfType(typeof(char), ','))[0]
Hello

"Hello,Test,What".Split(ArrayOfType(typeof(char), ','))[1]
Test

"Hello,Test,What".Split(ArrayOfType(typeof(char), ','))[2]
What

"Hello,Test,What".Split(new char[] {','}).Length
3

"Hello,Test,What".Split(new char[] {','})[0]
Hello

"Hello,Test,What".Split(new char[] {','})[1]
Test

"Hello,Test,What".Split(new char[] {','})[2]
What

new System.Xml.XmlDocument().FluidLoadXml("<root><element id='MyElement'>Xml Content</element></root>").SelectSingleNode("//element[@id='MyElement']").InnerXml
Xml Content

// if System.Net Assembly is referenced in your project.
$"https://www.google.ch/search?q={System.Net.WebUtility.UrlEncode("request with url encode() ?")}"
https://www.google.ch/search?q=request+with+url+encode()+%3F

Small scripts

using CodingSeb.ExpressionEvaluator;
//...
string script;
//...
ExpressionEvaluator evaluator = new ExpressionEvaluator();
Console.WriteLine("--------------------------------------------");
Console.WriteLine(script);
Console.WriteLine("---------------- Result --------------------");
Console.WriteLine(evaluator.ScriptEvaluate(script));

Results with some scripts :
Live examples here

--------------------------------------------
x = 0;
result = "";

while(x < 5)
{
    result += $"{x},";
    x++;
}

result.Remove(result.Length - 1);
---------------- Result --------------------
0,1,2,3,4

--------------------------------------------
result = "";

for(x = 0; x < 5;x++)
{
    result += $"{x},";
}

result.Remove(result.Length - 1);
---------------- Result --------------------
0,1,2,3,4

--------------------------------------------
x = 0;
y = 1;
result = 0;

if(y != 0)
{
    return 1;
}
else if(x == 0)
{
    return 2;
}
else if(x < 0)
{
    return 3;
}
else
{
    return 4;
}
---------------- Result --------------------
1

--------------------------------------------
x = 0;
y = 0;
result = 0;

if(y != 0)
{
    return 1;
}
else if(x == 0)
{
    return 2;
}
else if(x < 0)
{
    return 3;
}
else
{
    return 4;
}
---------------- Result --------------------
2

--------------------------------------------
x = 5;
y = 0;
result = 0;

if(y != 0)
{
    return 1;
}
else if(x == 0)
{
    return 2;
}
else if(x < 0)
{
    return 3;
}
else
{
    return 4;
}
---------------- Result --------------------
4

--------------------------------------------
Add = (x, y) => x + y;

return Add(3, 4);
---------------- Result --------------------
7
--------------------------------------------
Add = (x, y) => 
{
    var result = x + y;
    return result;
};

return Add(3, 4);
---------------- Result --------------------
7

To see more scripts examples see scripts uses for tests in sub directories CodingSeb.ExpressionEvaluator.Tests/Resources