[英]Creating an instance of a class with a name held in a string
I'm looking for a way to initialize a new instance of a class with a string as its name in order for me to find that specific instance in a list at a later point. 我正在寻找一种以字符串作为名称来初始化类的新实例的方法,以便稍后在列表中找到该特定实例。
Currently I have something along the lines of this code: 目前,我有一些与此代码类似的东西:
static List<ClassItem> classList = new List<ClassItem>();
private void updateClassList(Stream stream)
{
Message = Recieve(stream);
Interact(Message); //get the number of Classes about to be recieved
string ID;
string state;
for(int i = 0; i < numberOfClasses; i++)
{
Message = Recieve(stream);
interpretClassProperties(Message, out ID, out State);
ClassItem ID = new ClassItem(ID, state); //incorrect code
classList.Add(ID); //add new instance to list
}
}
Obviously this isn't going to work as I can't use a variable to initialise a class instance, however logically it shows what I want to achieve. 显然,这是行不通的,因为我不能使用变量来初始化类实例,但是从逻辑上讲,它显示了我想要实现的目标。 Each loop will add an instance of
ClassItem
(with the appropriate ID value as a name) to the classList
so I can find it later. 每个循环都会将
ClassItem
的实例(具有适当的ID值作为名称)添加到classList
以便稍后找到它。
What should I look into in order to achieve this? 为了实现这一目标,我应该考虑什么?
Any feedback appreciated, including any warnings of future problems I may have in approaching the problem in this fashion. 感谢您提供任何反馈意见,包括在以这种方式解决问题时可能遇到的未来问题的任何警告。 (Ie finding a class instance in a List by name).
(即按名称在List中查找类实例)。
Use Activator.CreateInstance: 使用Activator.CreateInstance:
public static ObjectHandle CreateInstance(
string assemblyName,
string typeName
)
You know your assembly name and receive the class name (type name). 您知道您的程序集名称,并收到类名称(类型名称)。
MSDN: https://msdn.microsoft.com/en-us/library/d133hta4(v=vs.110).aspx MSDN: https : //msdn.microsoft.com/zh-CN/library/d133hta4(v = vs.110) .aspx
Sample code: 样例代码:
static List<object> classList = new List<object>();
private void updateClassList(Stream stream)
{
Message = Recieve(stream);
Interact(Message); //get the number of Classes about to be recieved
string id;
for(int i = 0; i < numberOfClasses; i++)
{
Message = Recieve(stream);
interpretClassProperties(Message, out id);
classList.Add(Activator.CreateInstance("AssemblyName", id).Unwrap());
}
}
Is something like this what you're looking for? 您正在寻找类似这样的东西吗? Beware, though, this will likely create a memory nightmare in time unless you are certain to dereference your instances from the static list.
但是请注意,除非您确定要从静态列表中取消引用实例,否则这可能会及时造成内存噩梦。
public class ClassWithIds
{
public static List<ClassWithIds> Instances = new List<ClassWithIds>();
private static int _idSeed = 0;
private readonly string _name;
public string Name
{
get
{
return _name;
}
}
private static int NextId()
{
return Interlocked.Increment(ref _idSeed);
}
public ClassWithIds()
{
_name = this.GetType().FullName + " Number " + NextId();
Instances.Add(this);
}
}
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