从 dll 程序集中获取方法和属性 [英] Get methods and attributes from dll assembly

问题描述

我试图通过反射提供我的类 Plugin 的 dll 文件来运行一个小插件机制(实现我的 Plugin-在 dll 和主项目之间共享的接口/抱歉命名相同)提供类型 string 和主要方法 activate 的属性:

I'm trying to get a small plugin mechanism running by reflecting an dll file providing my class Plugin (implementing my Plugin-Interface shared among dll and main project / sorry for naming both the same) offering an attribute of type string and a main-method activate:

界面:

public interface Plugin
{
    string pluginName{get;set;}
    void activate(System.Windows.Forms.Form main);
}

dll 类:

    public class Plugin : WhiteA.Plugin
        {
            public string pluginName{get;set;}

            public void activate(System.Windows.Forms.Form main){
                //find the right form to modify it
                IEnumerable<System.Windows.Forms.ComboBox> ie= GetControlsOfType<System.Windows.Forms.ComboBox>(main);
                System.Windows.Forms.ComboBox cb=GetControlsOfType<System.Windows.Forms.ComboBox>(main).FirstOrDefault();
                cb.Items.Add("Modification");
                System.Windows.Forms.MessageBox.Show(cb.SelectedItem.ToString());
            }

            public static IEnumerable<T> GetControlsOfType<T>(System.Windows.Forms.Control root)
                where T : System.Windows.Forms.Control
            {
                var t = root as T;
                if (t != null)
                    yield return t;

                var container = root as System.Windows.Forms.ContainerControl;
                if (container != null)
                    foreach (System.Windows.Forms.Control c in container.Controls)
                        foreach (var i in GetControlsOfType<T>(c))
                            yield return i;
            }
        }

所以问题来了，在程序集中找不到名为"Plugin"的type.试图从目录中的所有程序集中获取所有类型，从中获取所有方法/成员/自定义属性，将它们记录下来等，但是找不到我的类 Plugin 的任何内容，而 dll肯定会被找到，因为它不返回 MessageBox.

So here comes the problem, there is no type named "Plugin" to be found in the assembly. Tried to get all types from all assemblies in the directory, get all methods/members/custom attributes from them, have them logged etc, but there is nothing of my class Plugin to be found, while the dll definitely is being found, as it doesn't return the MessageBox.

string[] files=new string[]{};
            string path="Error retrieving path";
            try{
                path = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
                files = System.IO.Directory.GetFiles(path, "*.dll");
            }catch(Exception exF){

            }
            if(files.Length>0){
                foreach (string dll in files){
                    try{
                        System.Reflection.Assembly sampleAssembly = System.Reflection.Assembly.LoadFrom(dll);
                        Type myType = sampleAssembly.GetType("Plugin");
                        System.Reflection.MethodInfo method = myType.GetMethod("activate");
                        object myInstance = Activator.CreateInstance(myType);
                        method.Invoke(myInstance, new object[]{this});
                    }catch(Exception exL){

                    }
                }
            }else{
                MessageBox.Show("No working plugins detected in " + path.ToString(), "Nothing to activate", MessageBoxButtons.OK,  MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
            }

我知道我的代码对你们来说可能看起来很乱 - 我认为最后一个 try-block 是这里唯一相关的东西，想把类本身和接口放在里面透明度虽然 - 我的英语并不完美，但我希望有人能帮助我在程序集中找到我的属性+方法.

I know my code probably looks really messy to you all - I think the last try-block is the only thing relevant here, wanted to put in the class itself and the interface for a little bit transparency though - and my english isn't perfect, but I hope someone can help me out finding my attribute+method in the assembly.

编辑:

                    try{
                        System.Reflection.Assembly sampleAssembly = System.Reflection.Assembly.LoadFrom(dll);

                        List<Type> list= sampleAssembly.GetTypes().Where(p =>
                                             p.Namespace == dll &&
                                             p.Name.Contains("Plugin")
                                            ).ToList();
                        Type myType=list.FirstOrDefault();

                        //Type myType = sampleAssembly.GetType("Plugin");
                        System.Reflection.MethodInfo method = myType.GetMethod("activate");
                        object myInstance = Activator.CreateInstance(myType);
                        method.Invoke(myInstance, new object[]{this});

                    }

我确实根据 获取所有类型进行了更改通过反射在命名空间中结果还是一样，我做错了什么?

I did change it according to Getting all types in a namespace via reflection Still the same result, what did I do wrong?

推荐答案

正如@stuartd 所指出的:

Type myType = sampleAssembly.GetType("WhiteA_Plugin_PausedVideo.Plugin");

是解决方案，错过了命名空间

cb.Items.Add("Modification");

虽然不起作用...有什么建议吗?

doesn't work though...any suggestions?

让它工作直接通过 Controls["nameOfChild"] 获取表单的子项，按类获取所有对象的帮助方法在这里似乎是错误的.

Got it to work getting the form's children by Controls["nameOfChild"] directly, that help method to fetch all objects by class seems to be wrong here.

插件现在可以使用了，谢谢！

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