C# Eval Expression Supported Keywords

As you already know that apart from simple expression execution, the Z.Expressions.Eval allows you to execute and compile small scripts which contain methods and variables, etc. Scripts are nothing but just a series of expressions separated by ; character and led by several additionals keywords.

Currently, all most all C# keywords are supported to use inside a script. The following example executes the script which contains multiple if and elseif statements.

public static void Example1()
{
    string script = @"
        
        if ( marks >= 80)
        {
            return ""A"";
        }
        else if (marks >= 70)
        {
            return ""B"";
        }
        else if(marks >= 60)
        {
            return ""C"";
        }
        else if(marks >= 50)
        {
            return ""D"";
        }
        else
        {
            return ""F"";
        }";

    var result = Eval.Execute<string>(script, new { marks = 77 });
    Console.WriteLine("Grade: {0}", result);
}

Let's run the above code and you will see the following output.

Grade: B

Now let's consider another example of a script that contains a for loop.

public static void Example2()
{
    string script = @"  
        for(;i < 10; i++)
        {
            Console.WriteLine(i*i);
        }";


    var compiled = Eval.Compile<Action<int>>(script, "i");
    compiled(0);
}

Let's run the above code and you will see the following output.

0
1
4
9
16
25
36
49
64
81