Question

我有这样的功能

 public void SetOperationDropDown()
        {
            cmbOperations.DataSource = PluginManager.GetAllPlugins();

            if(cmbOperations.Items.Count > 0)
            {
                cmbOperations.SelectedItem = cmbOperations.Items[0];
            }
        }

此函数应获取所有dll的名称

public class PluginManager
{

    /// <summary>
    /// This function gets the name of the plugins and return that in a List<string>.
    /// </summary>
    /// <param name="args"></param>
    /// <returns></returns>
public static List<string> GetAllPlugins()
{

    DirectoryInfo objDirectoryInfo = new DirectoryInfo("Plugins");
    FileInfo[] args = objDirectoryInfo.GetFiles("*.dll");

    List<string> assemblyNames = new List<string>();
    Assembly[] oAssemblies = new Assembly[args.Length];

    for(int assemblyCount = 0;assemblyCount < args.Length;assemblyCount++)
    {
        string executablePath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);

        oAssemblies[assemblyCount] = Assembly.LoadFile(executablePath.Remove(0,6) + "\\Plugins\\" + args[assemblyCount].Name);

        try
        {
            foreach(Type oType in oAssemblies[assemblyCount].GetTypes())
            {
                // Check whether class is inheriting from IMFDBAnalyserPlugin.
                if(oType.GetInterface("IMFDBAnalyserPlugin") == typeof(IMFDBAnalyserPlugin))
                {
                    assemblyNames.Add(args[assemblyCount].Name.Substring(args[assemblyCount].Name.LastIndexOf("\\") + 1));
                }
            }
        }
        catch(Exception ex)
        {
            EventLog log = new EventLog("Application");
            log.Source = "MFDBAnalyser";
            log.WriteEntry(ex.Message);
        }
    }

    // Passing data one application domain to another.
    AppDomain.CurrentDomain.SetData("AssemblyNames", assemblyNames.ToArray());
    return assemblyNames;
}

并且应该在此处返回的下拉列表中填充

        //Checks for the selectedItem in the cmbOpearions dropdown and make call to appropriate functions.


  string assemblyName = Convert.ToString(cmbOperations.SelectedValue);
    Assembly assembly = Assembly.LoadFrom(assemblyName);

    int fileExtensionPos = assemblyName.LastIndexOf(".");
    string fileName = assemblyName.Substring(0, fileExtensionPos);

    Type localType = assembly.GetType(fileName + "." + fileName);

但它不是通过这种方式创建每个dll

 Type localType = assembly.GetType(fileName + "." + fileName);

我需要在下拉列表中加载完整的dll列表。

我哪里错了???

Answer 1

你知道它不起作用吗？ “args”变量是否包含任何内容？我怀疑你的问题是你构建路径的方式。您应该使用Path类，而不是字符串操作。

获取当前的可执行文件目录：

string executablePath = Path.GetDirectoryName(Application.ExecutablePath);

您应该使用它来在GetAllPlugins（）方法的开头构建DirectoryInfo。使用子文件夹构建路径：

string pluginPath = Path.Combine(executablePath, "Plugin");

获取插件子目录中具有dll扩展名的所有文件：

string[] pluginFiles = Directory.GetFiles(pluginPath, "*.dll");

请注意，返回的文件名包含整个路径。你不需要附加任何东西：

foreach (string fileName in pluginFiles)
{
    Assembly assembly = Assembly.LoadFrom(fileName);
    List<Type> types = assembly.GetTypes().ToList();
    foreach (Type type in types.FindAll(t => t.GetInterface("IMFDBAnalyserPlugin") != null)
    {
        ...
    }
}

应该有用。

另外，不要使用substring，如果你想要文件名，无论是否有扩展名，你都应该使用Path.GetFileName或Path.GetFileNameWithoutExtension。

并使用此方法实例化您的插件： http://msdn.microsoft.com/en-us/library/wccyzw83.aspx

为什么所有Dll都没有加载下拉列表

1 个答案: