如何在VB6中将串联字符串评估为索引XPath表达式 [英] How evaluate concatenated string as indexed XPath expression in VB6

问题描述

我通过在VB6中连接字符串来构建Xpath表达式：

I've built an Xpath expression by concatenating strings in VB6:

    strXPath = "xDOC.selectNodes(" & """/GroupType1""" & ").item(" & CStr(i) & ").selectNodes(" & """/OperationStageCollection/OperationStage""" & ").length"

i是用于索引

我想评估strXPath以获得循环计数器，例如：

I want to evaluate strXPath to get a loop counter, for example:

    n = CInt(strXPath)

n被声明为Integer； strXPath声明为字符串。 VB6在上面的评估表达式上引发类型不匹配错误。我肯定想念一些明显的东西。如何评估strXPath？

n is declared as Integer; strXPath is declared as string. VB6 throws a Type Mismatch error on the above evaluation expression. I must be missing something obvious. How can I evaluate strXPath?

我意识到XPath表达式本身可能存在错误，但是我想让评估工作来调试此类可能的错误。

I realize that there may be errors in the XPath expression itself, but I'd like to get the evaluation working in order to debug such possible errors.

推荐答案

尝试删除一些双引号：

iLength = xDOC.selectNodes("/GroupType1").item(i).selectNodes("/OperationStageCollection/OperationStage").length

这应该以整数形式返回您想要的 length 属性。

This should return the length property you want, as an Integer.

然后您可以在循环中使用 iLength 。

Then you can use iLength in your loop.

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