MEF 导出导入 Expor Import

导出的

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.Composition;

namespace CalculatorContract
{
    [Export(typeof(ICalculator))]
    public class Calculator : ICalculator
    {
        public IList<IOperation> GetOperations()
        {
            return new List<IOperation>()
            {
                new Operation { Name="+", NumberOperands=2},
                new Operation { Name="-", NumberOperands=2},
                new Operation { Name="/", NumberOperands=2},
                new Operation { Name="*", NumberOperands=2}
            };
        }

        public double Operate(IOperation operation, double[] operands)
        {
            double result = 0;
            switch (operation.Name)
            {
                case "+":
                  
                    result = operands[0] + operands[1];
                    break;
                case "-":
                   
                    result = operands[0] - operands[1];
                    break;
                case "/":
                    result = operands[0] / operands[1];
                    break;
                case "*":
                    result = operands[0] * operands[1];
                    break;
                default:
                    throw new InvalidOperationException(
                        String.Format("invalid operation {0}", operation.Name));
            }
            return result;
        }
    }

    public class Operations2
    {
        [Export("Add",typeof(Func<double,double,double>))]
        [ExportMetadata("speed","fast")]
        public double Add(double a, double b)
        {
            return a + b;
        }
    }
    public class Operations1
    {
        [Export("Add", typeof(Func<double, double, double>))]
        [ExportMetadata("speed", "fast")]
        public double Add(double a, double b)
        {
            return a + b;
        }
    }
}

导入的

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;

namespace CalculatorContract
{
    public class Program
    {
        [Import]
        public ICalculator Calculator { get; set; }

        /// <summary>
        /// 导入多个同名的方法
        /// </summary>
        [ImportMany("Add",typeof(Func<double,double,double>))]
        public Lazy<Func<double, double, double>, IDictionary<string, object>>[] Addmethods { get; set; }
        static void Main(string[] args)
        {
            var p = new Program();
            p.Run();
            Console.ReadKey();
        }
        public void Run()
        {
            var catalog = new DirectoryCatalog(@"C:\AddIns");
            var container = new CompositionContainer(catalog);
           
            try
            {
                container.ComposeParts(this);
                Calculator.GetOperations();
                foreach (var m in Addmethods)
                {
                   
                    Console.WriteLine( m.Value(1,2));
                }
            }
            catch (ChangeRejectedException ex)
            {
                Console.WriteLine(ex.Message);
                return;
            }
        }
    }
}

Expor导出  Import导入   dynamic也支持的

指定dll生成路径

copy "$(TargetPath)" "c:/addins"