我正在实现一个库,我必须在其中进行一些转换才能获取类的实例,从 .dll 的文档中我们可以找到一个工作代码示例
df <- df %>%
mutate(across(where(is.factor), ~fct_infreq(fct_drop(.x))))
我想实现一个看起来像这样的方法:
public void Example()
{
DeviceItem deviceItem = ...;
GsdDeviceItem gsdDeviceItem =((IEngineeringServiceProvider)deviceItem).GetService<GsdDeviceItem>();
var attributeNames = new[] { "TypeName", "Author", "Comment" };
foreach (var attributeName in attributeNames)
{
object attributeValue =
((IEngineeringObject)gsdDeviceItem).GetAttribute(attributeName);
}
}
我收到错误 CS0118 'serviceType' is a variable but is used like a type, 如果有人能帮我,那就太好了
答案 0 :(得分:0)
如果 IEngineeringServiceProvider 继承自 IServiceProvider,请使用:
var service = Activator.CreateInstance(((IEngineeringServiceProvider)item).GetService(serviceType));
就这些