我试图弄清楚如何使用 离线文件 API（如果可能）。我相信，如果 API 是 COM API，那么理论上我应该能够使用以下方法从 C# 调用它 此处。
不幸的是，我不知道它是否是 COM API，也不知道如何判断。 （作为更一般的旁注，谁能告诉我如何判断 API 是否与 COM 兼容？）
我已成功从 API 调用 OfflineFilesQueryStatus 函数，声明如下
[DllImport("cscapi.dll")]
public static extern int OfflineFilesQueryStatus(out bool pbActive, out bool pbEnabled);
：不确定如何使用接口（即，我不知道如何创建 IOfflineFilesCache 对象。）
任何人都可以帮我解释一下吗？
I'm trying to figure out how to use the Offline Files API from C# (if possible). I believe that if the API is a COM API, then I should theoretically be able to call it from C# using the methods here.
Unfortunately, I have no idea if it's a COM API or not, or how to tell. (As a more general side note, can anyone tell me how to tell whether an API is COM compatible?)
I've successfully called the OfflineFilesQueryStatus function from the API by declaring it like:
[DllImport("cscapi.dll")]
public static extern int OfflineFilesQueryStatus(out bool pbActive, out bool pbEnabled);
But I'm not sure how to use the interfaces (i.e., I don't know how to create an IOfflineFilesCache object.)
Can anyone help explain this to me?
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嗯，它说
在 C 或 C++ 中，这将是对 CoCreateObject 的调用。只需使用
CoCreateObject的 .NET 替代品即可。我认为运行时可调用包装器/主互操作程序集应该发出元数据，让您可以使用普通的 C#new语法来创建对象。对于 COM 对象，使用 .NET 中的脱机文件 API 比平常更困难，MSDN 解释了原因：
.NET 依赖类型库进行互操作，但 Microsoft 仅为这些接口提供了 C/C++ 标头。通过一些 IDL 黑客攻击，您可以让它工作，请参阅创建自定义同步管理器处理程序MSDN 上的示例，其中包含“修复”
mobsync.dll的方法。您需要执行相同的步骤，但使用 cscapi/cscobj IDL。但到目前为止，最简单且最受支持的方法是使用 C++/CLI。在那里，您可以直接
#includeSDK 标头，还可以定义从 C# 轻松使用的托管类型。Well, it says
From C or C++, that'd be a call to
CoCreateObject. Just use the .NET replacement forCoCreateObject. I thought the runtime callable wrapper / primary interop assembly was supposed to emit metadata that would let you do that using the normal C#newsyntax for creating objects.Using the Offline Files API from .NET is more difficult than usual for COM objects, MSDN explains why:
.NET relies on the type library for interop, but Microsoft only provided the C/C++ header for these interfaces. With some IDL hacking, you can get it to work, see Creating a Custom Synchronization Manager Handler sample on MSDN, which has a recipe for "fixing"
mobsync.dll. You'd need to perform the same steps, but with the cscapi/cscobj IDL.But by far the easiest and best-supported approach would be to use C++/CLI. There you can directly
#includethe SDK headers, and you can also define managed types easily used from C#.