从.Net v4.5升级到.Net v4.5.2后，元素未声明验证错误 [英] Element is not declared validation error post upgrading from .Net v4.5 to .Net v4.5.2

问题描述

据我所知，对于XML验证，"找不到元素"错误已经有很多现有的线程，但是我发布这个问题，因为我的问题略有不同。

I understand that there are already many existing threads for the 'element not found' error for XML validation but I'm posting this as my problem is slightly different.

我的代码运行正常，直到它在.Net v4.5上。在将框架升级到v4.6.1之后，我开始在我的xml文件中为每个XML元素获取此错误。降级后，我发现错误从.Net framework v4.5.2开始发生。
以下是我的代码：

My code was running fine until it was on .Net v4.5. After upgrading the framework to v4.6.1, I started getting this error for each XML element in my xml file. Upon downgrading I found that the error started occurring from .Net framework v4.5.2 onwards. Below is my code:

XML - Book.xml

<?xml version="1.0" ?>
<!DOCTYPE book SYSTEM "Book.dtd">
<book>
    <title>The Lord of the Rings</title>
    <author>J.R.R. Tolkien</author>
    <isbn>1572810556</isbn>
</book>

DTD   - Book.dtd

DTD - Book.dtd

<!ELEMENT book (title, author, isbn)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT isbn (#PCDATA)>

C＃函数

public static void ReadXMLwithDTD()
{
    // Set the validation settings.
    XmlReaderSettings settings = new XmlReaderSettings();
    settings.ValidationType = ValidationType.DTD;
    settings.DtdProcessing = DtdProcessing.Parse;
    settings.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack);
    settings.IgnoreWhitespace = true;

    // Create the XmlReader object.
    XmlReader reader = XmlReader.Create("Book.xml", settings);

    // Parse the file.
    while (reader.Read())
    {
        Console.WriteLine("{0}, {1}: {2} ", reader.NodeType, reader.Name, reader.Value);
    }
}

private static void ValidationCallBack(object sender, ValidationEventArgs e)
{
    if (e.Severity == XmlSeverityType.Warning)
        Console.WriteLine("Warning: Matching schema not found.  No validation occurred." + e.Message);
    else // Error
        Console.WriteLine("Validation error: " + e.Message);
}

执行代码时，回调会引发所有四个XML元素的验证错误（未找到元素） - 书籍，标题，作者和
isbn。

我还发现DTD没有被读取。我在dtd文件中引入了错误，甚至重命名了文件，没有任何变化。接下来，我恢复了错误并将框架切换回4.5，代码按预期工作。由于框架仍然设置为4.5，我重新引入了
的错误，并且代码在适用时抛出了错误。

I also found that DTD is not read. I introduced errors in the dtd file, even renamed the file, there was no change. Next, I reverted the errors and switched the framework back to 4.5, the code worked as expected. With the framework still set at 4.5, I re-introduced the errors and the code threw errors as applicable.

请帮助，我需要紧急解决这个问题。

谢谢，

推荐答案

Hi Vishal Trivedi ，

这个论坛是关于C＃编程语言，IDE，库，示例和工具。由于
你的问题与在XML开发中，我会帮助您将此线程移至"XML，System.Xml，MSXML和XmlLite"论坛以获得更好的支持。

This forum is about the C# programming language, IDE, libraries, samples, and tools. As your issue is more related to the XML development, I would help you move this thread to the "XML, System.Xml, MSXML and XmlLite" forum for better support.

感谢您的理解。

最好的问候，

Albert
张

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