无法将类型为“System .__ ComObject”的COM对象强制转换为类类型“System.Xml.XmlDocument”

问题描述

我有一个com组件，我已在我的vb.net项目中注册并添加为参考。在尝试访问其方法时，我收到上述错误。需要你的帮助。



以下是代码片段



Dim testResult As Object = Nothing

Dim oxmldom As Object

Dim sXML As String

sXML =

testResult = CreateObject（ComReferenceDLL.iInterface1 ）

oxmldom = CreateObject（MSXML2.DOMDocument）

oxmldom = testResult.SampleMethod（sXML）





这里ComReferenceDLL是COM组件。

I have a com component, which i have registered and added as reference in my vb.net project. While trying to access its method I am getting the above error. Need your help.

Below is the code snippet

Dim testResult As Object = Nothing
Dim oxmldom As Object
Dim sXML As String
sXML = ""
testResult = CreateObject("ComReferenceDLL.iInterface1")
oxmldom = CreateObject("MSXML2.DOMDocument")
oxmldom = testResult.SampleMethod(sXML)


Here ComReferenceDLL is the COM component.

推荐答案

1. 使用 System.Xml.XmlDocument 类。它实现了DOM接口;如果文档的大小不是太大，这种方式是最简单和最好的。
   参见 []。
2. 使用类 System.Xml.XmlTextReader ;这是最快的阅读方式，特别是你需要跳过一些数据。
   参见 []。
3. 使用类 System.Xml.Linq.XDocument ;这是类似于 XmlDocument 的最合适的方式，支持LINQ to XML Programming。
   参见 []， []。

1. Use System.Xml.XmlDocument class. It implements DOM interface; this way is the easiest and good enough if the size if the document is not too big.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^].
2. Use the class System.Xml.XmlTextReader; this is the fastest way of reading, especially is you need to skip some data.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx[^].
3. Use the class System.Xml.Linq.XDocument; this is the most adequate way similar to that of XmlDocument, supporting LINQ to XML Programming.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^], http://msdn.microsoft.com/en-us/library/bb387063.aspx[^].

-SA

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