Can C# Code Fragments Be Dynamically Compiled and Executed?

Dynamic compilation and execution of the code fragment: possibility exploration

Assuming you have a series of C#code fragments, stored as text files or input streams. So, can we bypass the traditional compilation process, dynamically compile and execute these fragments?

Codedom: The weapon of dynamic compilation

In the world of C#and static .NET language, CODEDOM (code document object model) is the key to solving this problem. Its use is not limited to the construction of dynamic code, but also compiles code fragments or entire classes during runtime.

Example: Use CODEDOM to compile code fragment

The following C#code fragments demonstrate how to use CODEDOM for dynamic code compile:

The code that runs and compiled

<code class="language-csharp">using Microsoft.CSharp;
using System.Collections.Generic;
using System.CodeDom.Compiler;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        // 创建C#代码提供程序并设置编译参数
        var csc = new CSharpCodeProvider(new Dictionary<string, string>() { { "CompilerVersion", "v3.5" } });
        var parameters = new CompilerParameters(new[] { "mscorlib.dll", "System.Core.dll" }, "foo.exe", true);
        parameters.GenerateExecutable = true;

        // 从源字符串编译代码
        CompilerResults results = csc.CompileAssemblyFromSource(parameters,
        @"using System.Linq;
            class Program {
              public static void Main(string[] args) {
                var q = from i in Enumerable.Range(1,100)
                          where i % 2 == 0
                          select i;
                foreach(var item in q)
                    Console.WriteLine(item);
              }
            }");

        // 处理编译错误
        if (results.Errors.HasErrors)
        {
            foreach (CompilerError error in results.Errors)
            {
                Console.WriteLine(error.ErrorText);
            }
        }
    }
}</code>

After the code compilation is completed, you can use reflected dynamic loading program sets and execute its code:

Conclusion:

Codedom provides a powerful platform for dynamic compilation and execution of C#code fragment. While meeting the requirements of compilation and performance, it also provides the advantages of defining custom interfaces for the code segment. It should be noted that the use of in a newer .NET version has been abandoned. It is recommended to use a more modern Roslyn compiler API to achieve similar functions to obtain better performance and compatibility.

<code class="language-csharp">// 加载编译后的程序集
var assembly = Assembly.LoadFrom("foo.exe");

// 获取要执行的类型和方法
var type = assembly.GetType("Program");
var mainMethod = type.GetMethod("Main");

// 调用方法
mainMethod.Invoke(null, new object[] { new string[] { } });</code>

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