如果目录不存在,有没有办法安全地使用DirectoryCatalog来处理?
这是我的容器设置方式的代码示例:
//Create an assembly catalog of the assemblies with exports
var catalog = new AggregateCatalog(
new AssemblyCatalog(Assembly.GetExecutingAssembly()),
new AssemblyCatalog(Assembly.Load("My.Second.Assembly")),
new DirectoryCatalog("Plugins", "*.dll"));
//Create a composition container
var container = new CompositionContainer(catalog);
但如果目录不存在则抛出异常,我想忽略该错误。
答案 0 :(得分:9)
显然不会抛出异常。只需在运行MEF容器设置之前创建目录,然后就不会抛出任何错误。
路径必须是
AppDomain.BaseDirectory
的绝对路径或相对路径。
PsuedoCode进行目录检查:
string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Plugins");
//Check the directory exists
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
//Create an assembly catalog of the assemblies with exports
var catalog = new AggregateCatalog(
new AssemblyCatalog(Assembly.GetExecutingAssembly()),
new AssemblyCatalog(Assembly.Load("My.Other.Assembly")),
new DirectoryCatalog(path, "*.dll"));
//Create a composition container
_container = new CompositionContainer(catalog);