c# - 如何将 Type 对象用作具体类型？

Question

我正在使用一个外部 C# 库，该库将泛型用于其进程。但我想在外部类的循环中使用它。我的问题是我无法在类之间传递类型。

这是一个例子:

我使用 SettingsXmlReader 类来读取 xml 文件的某些部分。这些部分在具体类中指定:

SettingsXmlReader settingsXmlReader = new SettingsXmlReader(settingsXmlPath);
settingsXmlReader.AddContainer(typeof(ReleasePathContainer));
settingsXmlReader.AddContainer(typeof(HistoryPathContainer));
(...)

所以我将我的具体类型传递给了 settingsXmlReader 对象，但是现在，我不能像下面的方法那样使用这些类型(因为外部库需要它):

foreach (Type aContainer in containers)
{
    XmlContainerInitializer<aContainer> containerInitializer = new XmlContainerInitializer<aContainer>();
    IBaseContainer container = containerInitializer.InitializeXmlContainer(settingsXmlFile);
}

'aContainer' is a variable but is used like a type

我也尝试了以下模式:

SettingsXmlReader settingsXmlReader = new SettingsXmlReader(settingsXmlPath);
settingsXmlReader.AddContainer<ReleasePathContainer>();
settingsXmlReader.AddContainer<HistoryPathContainer>();

但在这种情况下我不知道如何存储或使用它:

private IList<T> containers;
public void AddContainer<T>()
{
    containers.Add<T>();
}

Answer 1

如果你真的需要使用那个“aContainer”循环，你可以通过使用 MakeGenericType 来避免变量与类型的错误，就像这样:

Type[] typeArgs = new Type[] { aContainer };

Type genericType = typeof(XmlContainerInitializer<>);
Type specificType = genericListType.MakeGenericType(typeArgs);

// This gets you a XmlContainerInitializer of the right type
var containerInitializer = Activator.CreateInstance(specificType);

// You can then try using it dynamically
dynamic d = containerInitalizer;
IBaseContainer container = (IBaseContainer)d.InitializeXmlContainer(settingsXmlFile);

// Or, if XmlContainerInitializer supports some base interface IContainerInitializer ...
var i = (IContainerInitializer)containerInitializer;
IBaseContainer container = i.InitializeXmlContainer(settingsXmlFile);