COM Interop与VB6和C＃ [英] COM Interop with VB6 and C#

问题描述

我正在编写一个将被VB 6程序使用的C＃COM对象。这不应该是一个问题，但是，VB6调用COM对象传递一个VB控件（在这种情况下是一个TextBox）。程序期望COM对象更改控件的Text属性。不幸的是，我必须坚持这个接口，因为我正在处理一个人遗留的代码。

I'm writing a C# COM object that will be used by a VB 6 program. That shouldn't be much of a problem, however, the VB6 call to the COM object passes in a VB Control (in this case a TextBox). The program expects the COM object to alter the Text property of the control. Unfortunately, I have to stick to this interface as I'm dealing with someone elses legacy code.

如何设置传递的TextBox的属性？我是否只需创建一个具有Text属性的接口并将输入转换到该接口？这是可能吗？

How can I set the property for the passed in TextBox? Do I simply create an interface with a Text property and cast input to that interface? Is this even possible?

如果我需要澄清，请让我知道。注意：我打算在以下代码中省略COM声明。

Please let me know if I need to clarify. Note: I intended to leave out the COM declarations in the following code.

// C# COM Object Interface
public interface IObj
{
    // This function must receive the argument of type object.
    void Test(object input);
}

// C# COM Object Implementation
public class Obj : IOjb
{
    // A VB6 TextBox is passed into here,
    // expecting a change to the Text property.
    public void Test(object input)
    {
        // INSERT NECESSARY CODE HERE

        input.Text = "arbitrary string";
    }
}


// VB 6
comObject.Test (txtBox)

推荐答案

您应该将用于更新文本框和任何其他UI特定代码的代码放入VB6 COM对象，任何非UI代码到C＃类，那么你不必在C＃中处理VB6 UI控件。

You should put code for updating the text box and any other UI specific code in to a VB6 COM object, and hand off any non-UI code to a C# class, then you will not have to deal with a VB6 UI control in C#.

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