This site uses cookies to deliver our services. By using this site, you acknowledge that you have read and understand our Cookie and Privacy policy. Your use of Kontext website is subject to this policy. Allow Cookies and Dismiss

动态产生程序集

125 views 0 comments last modified about 11 years ago Raymond Tang

using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Threading;
//动态创建程序集 by 1987Raymond 2008.7.17
//使用动态创建程序集的几种情形:
//在web浏览器中执行脚本
//在asp.net页中执行脚本
//使用反射发出编译正则表达式

//利用.net框架利用System.Reflection.Emit命名空间中的一组托管类型,我们可以动态创建程序集,在程序集中直接写入MSIL代码.首先我们可以在当前应用域下创建程序集框架,然后我们可以在该程序集框架下定义模块,接下来在模块对象中定义类型,为类型添加成员属性,在方法中可以直接写入MSIL代码

namespace Demo
{
    public interface ISayHello
    {
        int SayHello();
    }

    /// <summary>
    ///ReflectionOfDefineDynamicAssembly 的摘要说明
    /// </summary>
    public class ReflectionOfDefineDynamicAssembly
    {
        private ISayHello sayHello = null;
        public ReflectionOfDefineDynamicAssembly()
        {
            //
            //TODO: 在此处添加构造函数逻辑
            //
        }

        private Assembly EmitAssembly(string sMsg)
        {
            //创建程序集名称
            AssemblyName assemblyName = new AssemblyName("SayHelloAssembly");
            //创建新的动态程序集
            AssemblyBuilder newAssembly = Thread.GetDomain().DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
            //利用AssemblyBuilder创建ModuleBuilder
            ModuleBuilder newModule = newAssembly.DefineDynamicModule("SayHello");
            //创建一个公共类MySayHello
            TypeBuilder myType = newModule.DefineType("MySayHello", TypeAttributes.Public | TypeAttributes.Class);
            //使得该类实现ISayHello接口
            myType.AddInterfaceImplementation(typeof(ISayHello));
            //方法的传入参数
            Type[] paramTypes = new Type[0];//不传入参数
            //方法返回的类型
            Type returnType = typeof(int);
            //定义接口中的方法
            MethodBuilder myMethod = myType.DefineMethod("SayHello", MethodAttributes.Public | MethodAttributes.Virtual, returnType, paramTypes);
            //获取ILGenerator
            ILGenerator generator = myMethod.GetILGenerator();
            //编写代码
            generator.EmitWriteLine("Hello " + sMsg);
            //入栈
            generator.Emit(OpCodes.Ldc_I4, 1);
            //返回栈顶元素
            generator.Emit(OpCodes.Ret);
            //获得接口的方法信息
            MethodInfo info = typeof(ISayHello).GetMethod("SayHello");
            //规定方法重载
            myType.DefineMethodOverride(myMethod, info);
            //创建类型
            myType.CreateType();
            return newAssembly;
        }
        //动态创建程序集
        //初始化接口变量
        public void GenerateCode(string sMsg)
        {
            Assembly theAssembly = EmitAssembly(sMsg);
            sayHello = (ISayHello)theAssembly.CreateInstance("MySayHello");
        }

        //设置接口变量 如果不为空则
        public int DoSayHello(string sMsg)
        {
            if (sayHello != null)
            {
                GenerateCode(sMsg);
            }
            return sayHello.SayHello();
        }
    }

    public class Test
    {
        public static void Main()
        {

        ReflectionOfDefineDynamicAssembly test = new ReflectionOfDefineDynamicAssembly();
        int i = test.DoSayHello("1987Raymond/果汁分你一半");
        Console.WriteLine(i);

        }
    }
}

Related pages

Set AttachDbFilename as Relative Path in .NET Core

66 views   0 comments last modified about 2 months ago

.NET Framework, you can use |DataDirectory| to configure connection string when connecting to SQL Server database file via attach mode: AttachDbFilename=|DataDirectory|\dbname.mdf In .NET Core, you cannot directly set SQL Server Express connec...

View detail

Instantiate a Service in ConfigureServices Method in .NET Core

21 views   0 comments last modified about 2 months ago

.NET Core is built in with dependency injection. Usually method ConfigureServices in Startup class is used to register services in the container. The signature of the method looks like the following: public void ConfigureServices(IServiceC...

View detail

SQLite in .NET Core with Entity Framework Core

39 views   0 comments last modified about 2 months ago

SQLite is a self-contained and embedded SQL database engine. In .NET Core, Entity Framework Core provides APIs to work with SQLite. This page provides sample code to create a SQLite database using package Microsoft.EntityFrameworkCore.Sqlite . Create sample project ...

View detail

Graphics Programming and Image Processing in .NET Core 2.x

24 views   0 comments last modified about 2 months ago

In .NET Core 2.x, Windows Forms or WPF are not implemented since they are based on GDI+ and DirectX respectively in Windows. In .NET Core 3.0, there is plan to add Desktop Packs which includes UWP. WPF and Windows Forms. However, they will still be Windows-only. In .NET Core applications, you may...

View detail

Tuples in C# (4.x, 7.0, 7.1)

140 views   0 comments last modified about 6 months ago

What is a tuple? Tuple is an ordered sequence, fixed-size, immutable and of heterogeneous objects. Tuple has been existing in other languages such as F#, Python, Perl and etc. for a long time. It was first introduced into C# from C# 4.0 and has been evolving over time. Since C# 7.1, tuple...

View detail

Invoke Hadoop WebHDFS APIs in .NET Core

276 views   0 comments last modified about 6 months ago

Background Apache doesn't provide native official .NET APIs for Hadoop HDFS. The HTTP REST API supports the complete FileSystem / ...

View detail

Add comment

Please login first to add comments.  Log in New user?  Register

Comments (0)

No comments yet.