通过COM Interop暴露索引器/默认属性 [英] Exposing the indexer / default property via COM Interop

问题描述

我试图在C＃中编写一个组件，由经典的ASP使用，允许我访问组件的索引器（也称为默认属性）。

I am attempting to write a component in C# to be consumed by classic ASP that allows me to access the indexer of the component (aka default property).

示例：

C＃组件：

For example:
C# component:

public class MyCollection {
    public string this[string key] {
        get { /* return the value associated with key */ }
    }

    public void Add(string key, string value) {
        /* add a new element */
    }
}

ASP消费者：

Dim collection
Set collection = Server.CreateObject("MyCollection ")
Call collection.Add("key", "value")
Response.Write(collection("key")) ' should print "value"

有需要设置的属性，我需要实现一个接口，还是我需要做别的事情？或者这不可能通过COM Interop？

Is there an attribute I need to set, do I need to implement an interface or do I need to do something else? Or this not possible via COM Interop?

目的是，我试图创建测试双打一些内置的ASP对象，如请求，使用使用这些默认属性（例如 Request.QueryString（key））的集合。欢迎提出其他建议。

The purpose is that I am attempting to create test doubles for some of the built-in ASP objects such as Request, which make use of collections using these default properties (such as Request.QueryString("key")). Alternative suggestions are welcome.

更新：我问了一个后续问题：

Update: I asked a follow-up question: Why is the indexer on my .NET component not always accessible from VBScript?

推荐答案

尝试将属性的DispId属性设置为0，如 MSDN文档。

Try setting the DispId attribute of the property to be 0, as described here in the MSDN documentation.

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