This is one way I have found that I can compile code at runtime into a DLL file, then load it and call it.
The code I will be compiling is this:
class FruitVendor
{
private string fruits = "";
public FruitVendor()
{
fruits = "apples & bananas";
}
public string GetFruit()
{
return fruits;
}
}
I have two texts boxes, one for input and one for output. And in order to compile & run it, I do this:
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Reflection;
using System.CodeDom.Compiler;
namespace ProjectName
{
public partial class frmMain : Form
{
public frmMain()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
CodeDomProvider codeProvider = CodeDomProvider.CreateProvider("CSharp");
string outputFilename = "fruits.dll";
Button ButtonObject = (Button)sender;
System.CodeDom.Compiler.CompilerParameters parameters = new CompilerParameters();
parameters.GenerateExecutable = false;
parameters.OutputAssembly = outputFilename;
CompilerResults results = codeProvider.CompileAssemblyFromSource(parameters, textBox1.Text);
if (results.Errors.Count > 0)
{
textBox2.Text = "";
textBox2.ForeColor = Color.Red;
foreach (CompilerError CompErr in results.Errors)
{
textBox2.Text = textBox2.Text +
"Line number " + CompErr.Line +
", Error Number: " + CompErr.ErrorNumber +
", '" + CompErr.ErrorText + ";" +
Environment.NewLine + Environment.NewLine;
}
}
else
{
textBox2.ForeColor = Color.Black;
string path = System.Environment.CurrentDirectory + "\\" + outputFilename;
Assembly assembly = Assembly.LoadFrom(path);
Type type = assembly.GetType("FruitVendor");
MethodInfo mi = type.GetMethod("GetFruit");
object result = mi.Invoke(Activator.CreateInstance(type), null);
textBox2.Text = (string)result; ;
}
}
}
}
It works a treat and is pretty quick too. Thanks to everyone over at StackOverflow, this thread helped a lot!
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