我不是一个VB开发人员,但我领导着在VB中部分使用了大量的项目。其中一项要求是实现插件架构,支持动态可扩展的应用程序的核心。
I am not a VB developer but I am heading up a large project in which VB is partially used. One of the requirements is to implement a plugin architecture to support dynamically extendable application core.
我们的VB开发人员似乎认为它可以存储在BLL的DLL - 保持接口都在原来的核心应用 - 使之无用,直至扩展安装
Our VB developer seems to think its possible to store the BLL in a DLL - keeping the interface all in the original core application - rendering it useless until the extensions are installed.
显然,这是不太理想。我想知道它是否能够保持整个子应用程序/组件在不同的DLL加载到核心平台???
Obviously this is less than ideal. I would like to know whether its possible to keep the entire sub application/component in a distinct DLL load it into the core platform???
任何想法?
推荐答案
这是不是问题的了,看看我的例子code。 这是存在于单独的DLL抽象类:
This is not problem at all, take a look at my sample code. Here is abstract class that exists in separate dll:
public abstract class ServerTask
{
public int TaskId { get; set;}
/// <summary>
/// Gets description for ServerTask
/// </summary>
public abstract string Description { get; }
}
这是由插件实现code:
This is code from plugin implementation:
public class SampleTask : GP.Solutions.WF.Entities.Tasks.ServerTask
{
public override string Description
{
get
{
return "Sample plugin";
}
}
}
最后起价核心应用程序C $ C加载插件:
And finally code from core application that loads plugin:
/// <summary>
/// Loads Plugin from file
/// </summary>
/// <param name="fileName">Full path to file</param>
/// <param name="lockFile">Lock loaded file or not</param>
/// <returns></returns>
static Entities.Tasks.ServerTask LoadServerTask(string fileName, bool lockFile, int taskId)
{
Assembly assembly = null;
Entities.Tasks.ServerTask serverTask = null;
if (lockFile)
{
assembly = System.Reflection.Assembly.LoadFile(fileName);
}
else
{
byte[] data = Services.Common.ReadBinaryFile(fileName);
assembly = System.Reflection.Assembly.Load(data);
}
Type[] types = assembly.GetTypes();
foreach (Type t in types)
{
if (t.IsSubclassOf(typeof(Entities.Tasks.ServerTask)))
{
serverTask = (Entities.Tasks.ServerTask)Activator.CreateInstance(t);
serverTask.TaskId = taskId;
break;
}
}
if (serverTask == null)
{
throw new Exception("Unable to initialize to ServerTask type from library '" + fileName + "'!");
}
return serverTask;
}
如果您不熟悉C#只是用C#VB.NET的在线转换器。
If you are not familiar with c# just use c# to vb.net online converter.
快乐编码和最诚挚的问候! 格雷戈尔PRIMAR
Happy coding and best regards! Gregor Primar
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