/// <summary>
/// 基于约定的部件注册
/// </summary>
/// <param name="path"></param>
/// <param name="obj"></param>
/// <returns></returns>
public static bool FindEx(string path, MyCal obj)
{
var res = false;
var rb = new RegistrationBuilder(); //用于定义出口和入口的约定
rb.ForTypesDerivedFrom <ICalShow>().Export <ICalShow>(); //指定出口约定 给所有实现接口的类型应用[Export(Type)]特性
rb.ForType <MyCal>().ImportProperty <ICalShow>(t => t.Show); //指定入口约定 将入口映射到指定的属性上
var dc = new DirectoryCatalog(path, rb);
CompositionService sv = dc.CreateCompositionService();
try
{
sv.SatisfyImportsOnce(obj, rb); //在目录中搜索部件 多个出口匹配项出异常
res = true;
}
catch (ChangeRejectedException ex)
{
Console.WriteLine(ex.Message);
}
catch (CompositionException ex)
{
Console.WriteLine(ex.Message);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
sv.Dispose();
return(res);
}
/// <summary>
/// 基于约定的部件注册 类T注册接口K
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="K"></typeparam>
/// <param name="path"></param>
/// <param name="obj"></param>
/// <param name="propertyFilter"></param>
/// <returns></returns>
public static bool FindExt <T, K>(string path, T obj, Predicate <PropertyInfo> propertyFilter)
{
var res = false;
var rb = new RegistrationBuilder(); //用于定义出口和入口的约定
rb.ForTypesDerivedFrom <K>().Export <K>(); //指定出口约定 给所有实现接口的类型应用[Export(Type)]特性
rb.ForType <T>().ImportProperties(propertyFilter); //指定入口约定
var dc = new DirectoryCatalog(path, rb);
CompositionService sv = dc.CreateCompositionService();
try
{
sv.SatisfyImportsOnce(obj, rb); //在目录中搜索部件 若存在多个出口匹配项则抛出出异常
res = true;
}
catch (ChangeRejectedException ex)
{
Console.WriteLine(ex.Message);
}
catch (CompositionException ex)
{
Console.WriteLine(ex.Message);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
sv.Dispose();
return(res);
}
public void Run()
{
var conventions = new RegistrationBuilder();
conventions.ForTypesDerivedFrom <ICalculator>().Export <ICalculator>();
conventions.ForType <Program>().ImportProperty <ICalculator>(p => p.Calculator);
var catalog = new DirectoryCatalog(Settings.Default.AddInDirectory, conventions);
using (CompositionService service = catalog.CreateCompositionService())
{
service.SatisfyImportsOnce(this, conventions);
}
CalculatorLoop();
}