今天在公司写代码的时候发生了一个问题;
被调用代码如下:
public static class CatalogComposition { private static AggregateCatalog catalogs = new AggregateCatalog(); public static AggregateCatalog AggregateCatalog { get { return catalogs; } } public static void ComposeParts<T>(T t) { CompositionContainer compositionContainer = new CompositionContainer(AggregateCatalog); try { compositionContainer.ComposeParts(t); } catch (CompositionException ce) { throw new CompositionException(ce.Message, ce.InnerException); } } }
下面是没有纠正错误前的反射代码:
红色代码为错误代码。
抛出的异常为:
不能对 ContainsGenericParameters 为 True 的类型或方法执行后期绑定操作。
try
{
if (viewModel == null)
{
throw new ArgumentNullException("viewModel");
}
Type catalogComposition = Assembly.Load(ManifestConst.ARCHSTAR_FRAMEWORK_MEF).GetType(ManifestConst.ARCHSTAR_FRAMEWORK_MEF_CATALOGCOMPOSITION);
MethodInfo composePartsMethod = catalogComposition.GetMethod("ComposeParts", BindingFlags.Static | BindingFlags.Public);
composePartsMethod.Invoke(catalogComposition, new object[] { viewModel });
}
catch (ArgumentNullException ane)
{ }
catch (Exception ex)
{
throw new Exception(ex.Message);
}
下面是正确的代码:
protected void ComposeParts(V viewModel)
{
try
{
if (viewModel == null)
{
throw new ArgumentNullException("viewModel");
}
Type catalogComposition = Assembly.Load(ManifestConst.ARCHSTAR_FRAMEWORK_MEF).GetType(ManifestConst.ARCHSTAR_FRAMEWORK_MEF_CATALOGCOMPOSITION);
MethodInfo composePartsMethod = catalogComposition.GetMethod("ComposeParts", BindingFlags.Static | BindingFlags.Public);
composePartsMethod.MakeGenericMethod(new Type[] { typeof(V) }).Invoke(catalogComposition, new object[] { viewModel });
}
catch (ArgumentNullException ane)
{ }
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}