Can .NET Compile and Run Code Dynamically at Runtime?-C++-php.cn

Can .NET Compile and Run Code Dynamically at Runtime?

Linda Hamilton

Release： 2025-01-05 11:28:39

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Can .NET Compile and Run Code Dynamically at Runtime?

Can we Generate New Code and Run It on-the-Fly in .NET?

You want to empower users to input equations into a text box and have them applied to incoming data points. While parsing the equation's text for every calculation was your initial approach, you seek a more efficient solution: compiling the equation into a function at runtime.

In .NET, this is indeed possible using techniques found in the Microsoft.CSharp, System.CodeDom.Compiler, and System.Reflection namespaces. A simple console application can illustrate this concept:

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

namespace RuntimeCompilationTest {
    class Program
    {
        static void Main(string[] args) {
            // Define the source code for the SomeClass class
            string sourceCode = @"
                public class SomeClass {
                    public int Add42 (int parameter) {
                        return parameter += 42;
                    }
                }";

            // Set up compilation parameters
            var compParms = new CompilerParameters{
                GenerateExecutable = false, 
                GenerateInMemory = true
            };

            // Create a C# code provider
            var csProvider = new CSharpCodeProvider();

            // Compile the source code
            CompilerResults compilerResults = 
                csProvider.CompileAssemblyFromSource(compParms, sourceCode);

            // Create an instance of the SomeClass type
            object typeInstance = 
                compilerResults.CompiledAssembly.CreateInstance("SomeClass");

            // Get the Add42 method
            MethodInfo mi = typeInstance.GetType().GetMethod("Add42");

            // Invoke the Add42 method and display the output
            int methodOutput = 
                (int)mi.Invoke(typeInstance, new object[] { 1 }); 
            Console.WriteLine(methodOutput);
            Console.ReadLine();
        }
    }
}

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In this code:

The source code is defined for the SomeClass class containing the Add42 method.
Configuration for code compilation is set up through compParms.
csProvider compiles the source code.
An instance of SomeClass is created.
The Add42 method is invoked and its output is displayed.

This demonstration showcases the ability to compile and execute new code dynamically in .NET.

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