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);
}
}