再次引用 shell32，C# Visual Studio [英] Referencing shell32 again, C# Visual Studio

问题描述

嗯.好的，在重新访问 PInvoke 之后，我确定我不太明白:-/(只是问 这个问题)

Hmmm. Okay after revisiting PInvoke, I'm sure that I don't quite get it :-/ (just asked this question)

让我举例说明我需要处理的代码.当我使用添加引用 --> COM --> Microsoft Shell 控件和自动化"时，它可以工作……但遗憾的是，它在我的项目中放置了一个引用，如下所示:C:\Users\Tim\Documents\Visual Studio2008\Projects\Wing\FileWing\obj\Debug\Interop.Shell32.dll"

Let me illustrate the code I need to handle. It works when I use "Add Reference --> COM --> Microsoft Shell Controls and Automatation" ... but sadly it places a reference in my project that looks like this: "C:\Users\Tim\Documents\Visual Studio 2008\Projects\Wing\FileWing\obj\Debug\Interop.Shell32.dll"

我正在挖掘回收箱并寻找我想要回收的物品.有没有办法不通过 PInvoke 来完成这项工作?或者获取对 system32/shell32.dll 的引用，以便我在运行时使用此代码?

I'm digging though the recycling bin and seek for a item that I want to recover. Is there any way NOT fighting through the PInvoke to get this done? Or to get a reference to the system32/shell32.dll that lets me use this code at runtime?

private void recoverRecyclerBinEntry(string fileName, int size)
{
    try
    {
        Shell Shl = new Shell();
        Folder Recycler = Shl.NameSpace(10);

        // scans through all the recyclers entries till the one to recover has been found
        for (int i = 0; i < Recycler.Items().Count; i++)
        {
            FolderItem FI = Recycler.Items().Item(i);
            string FileName = Recycler.GetDetailsOf(FI, 0);
            if (Path.GetExtension(FileName) == "")
                FileName += Path.GetExtension(FI.Path);
            //Necessary for systems with hidden file extensions.

            string FilePath = Recycler.GetDetailsOf(FI, 1);
            string combinedPath = Path.Combine(FilePath, FileName);

            if (size == FI.Size && fileName == combinedPath)
            {
                Debug.Write("Match found. Restoring " + combinedPath + "...");
                Undelete(FI);
                Debug.WriteLine("done.");
            }
            else
            {
                Debug.WriteLine("No match");
            }
        }
    } 
    catch (Exception ex)
    {
        Debug.WriteLine(ex.Message);
        Debug.WriteLine(ex.StackTrace);
    }
}

private bool Undelete(FolderItem Item)
{
    try
    {
        foreach (FolderItemVerb FIVerb in Item.Verbs())
        {
            if (
                (FIVerb.Name.ToUpper().Contains("WIEDERHERSTELLEN")) ||
                (FIVerb.Name.ToUpper().Contains("ESTORE")) ||
                (FIVerb.Name.ToUpper().Contains("NDELETE"))
                )
            {
                FIVerb.DoIt();
                return true;
            }
        }
        //execute the first one:
        Item.Verbs().Item(0).DoIt();
        return true;
    }
    catch (Exception)
    {
        Debug.WriteLine("ERROR undeleting");
        return false;
    }
}

推荐答案

现在您正在混合 2 个不同的概念:PInvoke 和 COM Interop.

Right now you're mixing 2 different concepts: PInvoke and COM Interop.

PInvoke 允许您从托管代码中访问本机 C 函数.它的工作原理是在托管代码中定义本地方法的编组兼容签名，并使用 DllImport 属性对其进行标记.它需要并且不能拥有对本机 DLL 的元数据引用.DLL 是在运行时使用 Win32 DLL 的正常加载规则发现的.

PInvoke allows you to access native C functions from within managed code. It works by defining a marshal compatible signature of the native method in managed code and marking it with the DllImport attribute. It requires, and cannot have, a metadata reference to the native DLL. The DLL is discovered at runtime using normal loading rules for a Win32 DLL.

COM Interop 允许您从托管代码访问 COM 兼容对象.这是通过获得 COM 接口的编组兼容托管定义，然后以多种方式之一获得对对象的引用来完成的.获取托管定义通常是通过向 COM 组件的 PIA(主互操作程序集)添加元数据引用来完成的.在 C# 4.0 之前，无法删除此引用，无需大量工作，必须与您的应用程序一起部署.

COM Interop allows you to access COM compatible objects from managed code. This is done by getting a marshal compatible managed definition of the COM interface and then gaining a referece to the object in one of several ways. Getting the managed definition is often accomplished by means of adding a metadata reference to the PIA (primary interop assembly) for the COM component. Until C# 4.0, this reference cannot be removed, without a lot of work, and must be deployed with your application.

在此特定示例中，您使用的是 COM 互操作而不是 PInvoke.

In this particular example you are using COM interop and not PInvoke.

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