C#通过脚本实现接口的示例详解_Asp.net

以前c#脚本用的委托注入模式，今天在提示下，尝试用脚本直接实现接口，然后c#可以动态或指定新类型创建接口实现对象。从代码角度看，稍显复杂，但脚本方面显得更简洁和有条理。

引用包需要microsoft.codeanalysis、microsoft.codeanalysis.common等，其他自动添加：

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="humanizer.core" version="2.14.1" targetframework="net472" />
  <package id="microsoft.bcl.asyncinterfaces" version="8.0.0" targetframework="net472" />
  <package id="microsoft.codeanalysis" version="4.13.0" targetframework="net472" />
  <package id="microsoft.codeanalysis.analyzers" version="3.11.0" targetframework="net472" developmentdependency="true" />
  <package id="microsoft.codeanalysis.common" version="4.13.0" targetframework="net472" />
  <package id="microsoft.codeanalysis.csharp" version="4.13.0" targetframework="net472" />
  <package id="microsoft.codeanalysis.csharp.scripting" version="4.13.0" targetframework="net472" />
  <package id="microsoft.codeanalysis.csharp.workspaces" version="4.13.0" targetframework="net472" />
  <package id="microsoft.codeanalysis.scripting.common" version="4.13.0" targetframework="net472" />
  <package id="microsoft.codeanalysis.visualbasic" version="4.13.0" targetframework="net472" />
  <package id="microsoft.codeanalysis.visualbasic.workspaces" version="4.13.0" targetframework="net472" />
  <package id="microsoft.codeanalysis.workspaces.common" version="4.13.0" targetframework="net472" />
  <package id="microsoft.csharp" version="4.7.0" targetframework="net472" />
  <package id="system.buffers" version="4.5.1" targetframework="net472" />
  <package id="system.collections.immutable" version="8.0.0" targetframework="net472" />
  <package id="system.composition" version="8.0.0" targetframework="net472" />
  <package id="system.composition.attributedmodel" version="8.0.0" targetframework="net472" />
  <package id="system.composition.convention" version="8.0.0" targetframework="net472" />
  <package id="system.composition.hosting" version="8.0.0" targetframework="net472" />
  <package id="system.composition.runtime" version="8.0.0" targetframework="net472" />
  <package id="system.composition.typedparts" version="8.0.0" targetframework="net472" />
  <package id="system.io.pipelines" version="8.0.0" targetframework="net472" />
  <package id="system.memory" version="4.5.5" targetframework="net472" />
  <package id="system.numerics.vectors" version="4.5.0" targetframework="net472" />
  <package id="system.reflection.metadata" version="8.0.0" targetframework="net472" />
  <package id="system.runtime.compilerservices.unsafe" version="6.0.0" targetframework="net472" />
  <package id="system.text.encoding.codepages" version="7.0.0" targetframework="net472" />
  <package id="system.threading.channels" version="7.0.0" targetframework="net472" />
  <package id="system.threading.tasks.extensions" version="4.5.4" targetframework="net472" />
</packages>

接口定义如下：

namespace windowsformsapp1
{
    public interface iflexiblepluginagent
    {
        string registdrtype();
    }
}

验证文件textfile1.txt如下：

using system;
using system.collections.generic;
 
public class flexiblepluginagentprocessscriptxxxx : windowsformsapp1.iflexiblepluginagent
{
	public string registdrtype()
	{
		return "scritp_drv";
	}
}

加载和验证代码如下：

using microsoft.codeanalysis.csharp;
using microsoft.codeanalysis.emit;
using microsoft.codeanalysis;
using system;
using system.collections.generic;
using system.io;
using system.linq;
using system.reflection;
 
namespace windowsformsapp1
{
    internal static class program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [stathread]
        static void main()
        {
            scripttest();
        }
        static void scripttest()
        {
            try
            {
                // 读取外部代码文件
                string codefilepath = "textfile1.txt";
                string sourcecode = file.readalltext(codefilepath);
 
                var compilation = csharpcompilation.create("dynamicassembly")
                    .withoptions(new csharpcompilationoptions(outputkind.dynamicallylinkedlibrary))
                    .addreferences(metadatareference.createfromfile(typeof(object).assembly.location))
                    .addreferences(metadatareference.createfromfile(typeof(iflexiblepluginagent).assembly.location))
                    .addsyntaxtrees(csharpsyntaxtree.parsetext(sourcecode));
 
                // 检查编译错误
                var diagnostics = compilation.getdiagnostics();
                if (diagnostics.hasanyerrors())
                {
                    console.writeline("编译错误:");
                    foreach (var diagnostic in diagnostics.where(d => d.severity == diagnosticseverity.error))
                    {
                        console.writeline(diagnostic.tostring());
                    }
                    return;
                }
 
                // 内存中生成程序集
                using (var ms = new memorystream())
                {
                    emitresult emitresult = compilation.emit(ms);
 
                    if (!emitresult.success)
                    {
                        console.writeline("程序集生成失败:");
                        foreach (var diagnostic in emitresult.diagnostics.where(d => d.severity == diagnosticseverity.error))
                        {
                            console.writeline(diagnostic.tostring());
                        }
                        return;
                    }
 
                    ms.seek(0, seekorigin.begin);
                    assembly assembly = assembly.load(ms.toarray());
 
                    console.writeline("---检查程序集中是否有iflexiblepluginagent的派生类---");
                    var derivedtypes = assembly.definedtypes
                        .where(t => typeof(iflexiblepluginagent).isassignablefrom(t) && !t.isinterface)
                        .tolist();
 
                    if (derivedtypes.any())
                    {
                        console.writeline("找到以下iflexiblepluginagent的派生类:");
                        foreach (var type in derivedtypes)
                        {
                            console.writeline($"  - {type.fullname}");
                        }
 
                        // 使用第一个派生类创建对象
                        type agenttype = derivedtypes.first().astype();
                        iflexiblepluginagent agent = (iflexiblepluginagent)activator.createinstance(agenttype);
                        string result = agent.registdrtype();
 
                        console.writeline($"注册的 drtype 是: {result}");
                    }
                    else
                    {
                        console.writeline("未找到iflexiblepluginagent的派生类");
                    }
 
                    console.writeline("---知道类名字直接调用---");
                    type agenttype2 = assembly.gettype("flexiblepluginagentprocessscriptxxxx");
                    if (agenttype2 == null)
                    {
                        console.writeline("未找到 mypluginagent 类型");
                        return;
                    }
 
                    iflexiblepluginagent agent2 = (iflexiblepluginagent)activator.createinstance(agenttype2);
                    string result2 = agent2.registdrtype();
 
                    console.writeline($"注册的 drtype 是: {result2}");
 
                }
            }
            catch (exception ex)
            {
                console.writeline($"发生错误: {ex.message}");
            }
        }
    }
    // 扩展方法用于检查诊断信息
    public static class diagnosticextensions
    {
        public static bool hasanyerrors(this ienumerable<diagnostic> diagnostics)
        {
            return diagnostics.any(d => d.severity == diagnosticseverity.error);
        }
    }
}

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