[英]Dynamically invoke a method in DLL
I have a DLL containing some methods (show, hide and validate). 我有一个包含一些方法(显示,隐藏和验证)的DLL。 Here is an example of one of the methods hide(Panel paneldynamic, String id, List<EventActions> eventList)
. 这是方法hide(Panel paneldynamic, String id, List<EventActions> eventList)
。 All methods contains the same parameters. 所有方法都包含相同的参数。
Now I have referenced the my DLL on my main form, how can I dynamically invoke one of the methods at runtime? 现在,我已经在主窗体上引用了DLL,如何在运行时动态调用其中一种方法?
You'll need to use reflection. 您将需要使用反射。 First, load the assembly (note that this assumes you've imported System.Reflection
): 首先,加载程序集(请注意,这假定您已导入System.Reflection
):
Assembly a = Assembly.LoadFile(pathToTheDll);
Get the type containing the method by fully-qualified name: 通过完全限定的名称获取包含方法的类型:
Type t = a.GetType("Some.Class");
Now, get the method: 现在,获取方法:
MethodInfo m = t.GetMethod("hide"); // For example
Then, all you have to do is invoke it: 然后,您要做的就是调用它:
m.Invoke(null, new object[] { /* parameters go here */ });
The first argument to Invoke
is the instance. Invoke
的第一个参数是实例。 If your class is static
, use null
, otherwise, you'll need to supply an instance of the type created using Assembly.CreateInstance
. 如果您的类是static
,请使用null
,否则,您将需要提供一个使用Assembly.CreateInstance
创建的类型的实例。
Insert your methods as delegates into a dictionary 将您的方法作为委托插入字典中
public enum MethodType
{
None,
Show,
Hide,
Validate
}
var methods = new Dictionary<MethodType, Action<Panel, String, List<EventActions>>();
methods.Add(MethodType.Show, show);
methods.Add(MethodType.Hide, hide);
methods.Add(MethodType.Validate, validate);
Then you can invoke one of them with 然后,您可以使用
MethodType methodToInvoke = MethodType.Hide;
methods[methodToInvoke](paneldynamic, id, eventList);
If you intend to dynamically load the DLL, this is another story. 如果打算动态加载DLL,则这是另一回事了。 You will need at least three assemblies (three projects): one main assembly (exe), one contract assembly (dll) and one plug-in assembly (dll). 您将至少需要三个程序集(三个项目):一个主程序集(exe),一个合同程序集(dll)和一个插件程序(dll)。 The main and the plug-in assembly both have to reference the contract assembly. 主组件和插件组件都必须引用合同组件。 The contract assembly contains an interface 合同程序集包含一个接口
public interface IPlugIn
{
void Show(Panel paneldynamic, String id, List<EventActions> eventList);
void Hide(Panel paneldynamic, String id, List<EventActions> eventList);
void Validate(Panel paneldynamic, String id, List<EventActions> eventList);
}
The plug-in assembly contains a class implementing the interface 插件程序集包含一个实现接口的类
public class PlugIn : IPlugIn
{
// TODO: implement IPlugIn
}
In the main assembly you can load the plug-in like this 在主组件中,您可以像这样加载插件
IPlugIn LoadPlugInFromFile(string fileName)
{
Assembly asm = Assembly.LoadFrom(fileName);
Type type = asm.GetType("PlugIn");
IPlugIn plugIn = (IPlugIn)Activator.CreateInstance(type);
return plugIn;
}
Invoke like this 像这样调用
IPlugIn plugIn = LoadPlugInFromFile("C:\PlugIns\MyPlugIn.dll");
plugIn.Show(paneldynamic, id, eventList);
You can get type by Reflection and invoke method like this: 您可以通过反射获取类型并调用如下方法:
type.InvokeMember("hide", BindingFlags.InvokeMethod | BindingFlags.Static |
BindingFlags.Public, null, null, new object[] { paneldynamic, id, eventList });
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