C#将事件处理程序添加到在运行时从程序集加载的类

Question

作为评估名为"GemBox.document"的第三方DLL的一部分,我希望能够在运行时运行此程序集.但是为了让它在试用模式下运行,我需要使用:

ComponentInfo.FreeLimitReached += 
    (sender, e) => e.FreeLimitReachedAction = FreeLimitReachedAction.ContinueAsTrial;

如果您直接引用应用程序中的DLL,这是标准方法.但是,我希望能够通过在运行时调用DLL来实现此目的.这个的正确语法是什么？

编辑:ComponentInfo是一个公共静态类GemBox.Document

Answer 1

为了将来参考,以下是我们如何在运行时加载GemBox.Document程序集并通过反射将其设置为试用模式:

using System;
using System.Reflection;

class Program
{
    // Load GemBox.Document assembly.
    static Assembly gemboxAssembly = Assembly.LoadFrom(@"C:\GemBox.Document.dll");

    // Create method for handling FreeLimitReached event.
    static void HandleFreeLimit(object sender, EventArgs e)
    {
        // Call: e.FreeLimitReachedAction = FreeLimitReachedAction.ContinueAsTrial
        dynamic freeLimitArgs = e;
        freeLimitArgs.FreeLimitReachedAction =
            (dynamic)Enum.Parse(
                gemboxAssembly.GetType("GemBox.Document.FreeLimitReachedAction"),
                "ContinueAsTrial");
    }

    static void Main(string[] args)
    {
        // Call: ComponentInfo.SetLicense("FREE-LIMITED-KEY")
        Type componentInfo = gemboxAssembly.GetType("GemBox.Document.ComponentInfo");
        componentInfo.GetMethod("SetLicense", BindingFlags.Public | BindingFlags.Static)
            .Invoke(null, new object[] {"FREE-LIMITED-KEY"});

        // Get HandleFreeLimit as MethodInfo.
        MethodInfo handleFreeLimitMethod =
            typeof(Program).GetMethod("HandleFreeLimit",
                BindingFlags.NonPublic | BindingFlags.Static);

        // Call: ComponentInfo.FreeLimitReached += HandleFreeLimit
        EventInfo freeLimitReached = componentInfo.GetEvent("FreeLimitReached");
        freeLimitReached.AddEventHandler(null,
            Delegate.CreateDelegate(freeLimitReached.EventHandlerType,
                handleFreeLimitMethod));

        // Call: DocumentModel document = DocumentModel.Load(@"C:\Sample.docx")
        Type documentModel = gemboxAssembly.GetType("GemBox.Document.DocumentModel");
        dynamic document = documentModel.GetMethod("Load", new Type[]{ typeof(string)})
            .Invoke(null, new object[] { @"C:\Sample.docx" });

        // TODO: Use "document" object as needed ...
        document.Save(@"C:\Sample.pdf");
    }
}