尝试使用MEF进行依赖注入并获得错误

本文关键字：注入 错误 依赖 MEF | 更新日期: 2023-09-27 18:09:05

设置依赖注入后，我得到了基数不匹配的MEF错误。我相信我正确地从接口导出，当我检查程序时，实际目录是空的。不知道我做错了什么!

容器组成 

 private static CompositionContainer CreateContainer()
     {
         AggregateCatalog catalog = new AggregateCatalog();
         catalog.Catalogs.Add(new AssemblyCatalog(typeof(IClient).Assembly));
         CompositionContainer container = new CompositionContainer(catalog);
         return container;     
     }
<<p> 创建容器/strong> 
 static void Main(string[] args)
     {
         CompositionContainer container = CreateContainer();
         IClient contactList = container.GetExportedValue<IClient>();
         // More code below, but error is happening on the above line
     }

客户端导入

namespace MyWcfProgram.WcfProgram
{
    [Export(typeof(IClient))]
    public class Client : IClient
    {    
        private readonly ILogic contactLogic;
        [ImportingConstructor]
        public Client([Import] ILogic contactLogic)
        {
            if(contactLogic == null)
            {
                throw new Exception();
            } else
            {
                this.contactLogic = contactLogic;
            }
        }
        // MORE BELOW LEFT OUT
    }

逻辑导入

namespace MyWcfProgram.Logic
{
    [Export(typeof(ILogic))]
    public class Logic : ILogic
    {
        private readonly IData dataAccess;
         [ImportingConstructor]
        public Logic([Import] IData dataAccess)
        {
            if (dataAccess == null)
            {
                throw new Exception();
            }
            this.dataAccess = dataAccess;
        }

Data.cs 

namespace MyWcfProgram.Data
{
    [Export(typeof(IData))]
    public class Data : IData
    {
        private string connectionString = "CONNECTION STRING IS HERE";
        private System.Data.SqlClient.SqlConnection myconnection = new System.Data.SqlClient.SqlConnection();
        // More code below, but no constructor since there are no dependencies
}

尝试使用MEF进行依赖注入并获得错误

我知道你没有问这个，但我可能建议使用SimpleInjector代替，如果你没有硬依赖于MEF。MEF已经过时了，如果你需要的只是一个IOC框架，那么使用SimpleInjector会好得多。

容器组成 

 private static Container CreateContainer()
     {
         var container = new Container();
         container.Register<IClient, MyWcfProgram.WcfProgram.Client>();
         container.Register<ILogic, MyWcfProgram.Logic.Logic>();
         container.Register<IData, MyWcfProgram.Data.Data>();
         return container;     
     }
<<p> 创建容器/strong> 
static void Main(string[] args)
     {
         var container = CreateContainer();
         IClient contactList = container.GetExportedValue<IClient>();
         // More code below, but error is happening on the above line
     }

客户端导入

namespace MyWcfProgram.WcfProgram
{
    public class Client : IClient
    {    
        private readonly ILogic contactLogic;
        public Client(ILogic contactLogic)
        {
            if(contactLogic == null)
            {
                throw new Exception();
            } else
            {
                this.contactLogic = contactLogic;
            }
        }
        // MORE BELOW LEFT OUT
    }

逻辑导入

namespace MyWcfProgram.Logic
{
    public class Logic : ILogic
    {
        private readonly IData dataAccess;
        public Logic(IData dataAccess)
        {
            if (dataAccess == null)
            {
                throw new Exception();
            }
            this.dataAccess = dataAccess;
        }

Data.cs 

namespace MyWcfProgram.Data
{
    public class Data : IData
    {
        private string connectionString = "CONNECTION STRING IS HERE";
        private System.Data.SqlClient.SqlConnection myconnection = new System.Data.SqlClient.SqlConnection();
        // More code below, but no constructor since there are no dependencies
}
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