c# 动态编译代码

「爱情、让人受尽委屈。」 2022-01-15 04:41 210阅读 0赞

[为什么80%的码农都做不了架构师？>>> ][80_] ![hot3.png][]

有时候做计算一些东西时候，算法一直变更，写在程序需要一直调整，因此算法写在cs文件，然后动态调用内部的方法去计算判断，只需变更cs文件即可。

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

namespace ConsoleApplication  
\{  
class Program  
\{  
static void Main()  
\{  
Stopwatch watch = new Stopwatch();  
watch.Start();  
//创建一个CSharp语言Provider  
//CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");  
CSharpCodeProvider provider = new CSharpCodeProvider();  
watch.Stop();  
Console.WriteLine("创建耗时：" + watch.ElapsedMilliseconds);

watch.Restart();  
//设置编译时参数  
CompilerParameters objCompilerParameters = new CompilerParameters();  
//添加代码用到的相关引用  
objCompilerParameters.ReferencedAssemblies.Add("System.dll");  
//没有Main函数就不能生成可执行文件  
objCompilerParameters.GenerateExecutable = false;  
objCompilerParameters.GenerateInMemory = true;  
watch.Stop();  
Console.WriteLine("设置编译参数耗时：" + watch.ElapsedMilliseconds);

watch.Restart();  
//编译代码  
string code = File.ReadAllText(AppDomain.CurrentDomain.BaseDirectory + "Class1.cs");  
CompilerResults cr = provider.CompileAssemblyFromSource(objCompilerParameters, code);  
watch.Stop();  
Console.WriteLine("编译耗时：" + watch.ElapsedMilliseconds);

if (cr.Errors.HasErrors)  
\{  
Console.WriteLine("编译错误：");  
foreach (CompilerError err in cr.Errors)  
\{  
Console.WriteLine(err.ErrorText);  
\}  
\}  
else  
\{  
watch.Restart();  
// 通过反射，调用HelloWorld的实例  
object objHelloWorld = cr.CompiledAssembly.CreateInstance("ConsoleApplication.Class1");  
MethodInfo objMI = objHelloWorld.GetType().GetMethod("test");  
Console.WriteLine(objMI.Invoke(objHelloWorld, null));  
watch.Stop();  
Console.WriteLine("调用耗时：" + watch.ElapsedMilliseconds);  
\}  
Console.ReadLine();  
\}  
\}  
\}

被调用的cs文件内容

using System;  
using System.Collections.Generic;  
using System.Text;  
using System.Threading.Tasks;

namespace ConsoleApplication  
\{  
class Class1  
\{  
//写个方法测试下动态调用的情况  
public void test()  
\{  
DateTime now = DateTime.Now;

List<string> aa = new List<string>();  
aa.Add("aa");  
Console.WriteLine(now);  
\}  
\}  
\}

参考地址：http://www.cnblogs.com/jailu/archive/2007/07/22/827058.html

转载于:https://my.oschina.net/uwith/blog/3042974

[80_]: https://my.oschina.net/u/2663968/blog/3051541
[hot3.png]: /images/20220115/1536056ebb8241fcbe1b122d0dbaf97d.png