检查格式良好的XML没有一个try / catch？ [英] Check well-formed XML without a try/catch?

问题描述

有谁知道我可以检查一个字符串包含格式良好的XML没有在try / catch块使用像 XmlDocument.LoadXml（）？我有输入，可能会或可能不会XML，我想code的认识，认为输入可能不是XML不依赖于一个try / catch，为速度和一般原则，即非特殊情况不该T抛出异常。我现在有code，做这一点;

Does anyone know how I can check if a string contains well-formed XML without using something like XmlDocument.LoadXml() in a try/catch block? I've got input that may or may not be XML, and I want code that recognises that input may not be XML without relying on a try/catch, for both speed and on the general principle that non-exceptional circumstances shouldn't raise exceptions. I currently have code that does this;

private bool IsValidXML(string value)
    {
        try
        {
            // Check we actually have a value
            if (string.IsNullOrEmpty(value) == false)
            {
                // Try to load the value into a document
                XmlDocument xmlDoc = new XmlDocument();

                xmlDoc.LoadXml(value);

                // If we managed with no exception then this is valid XML!
                return true;
            }
            else
            {
                // A blank value is not valid xml
                return false;
            }
        }
        catch (System.Xml.XmlException)
        {
            return false;
        }
    }

但似乎喜欢的事，不应该要求try / catch语句。唯一的例外是在调试过程中引起快乐的地狱，因为我每次检查字符串中的调试器将中断在这里，''帮助我与我的讨厌的问题。

But it seems like something that shouldn't require the try/catch. The exception is causing merry hell during debugging because every time I check a string the debugger will break here, 'helping' me with my pesky problem.

推荐答案

我不知道没有异常确认的一种方式，但您可以更改调试器设置为仅打破 XmlException 如果是未处理的 - 这应解决您的紧迫问题，即使code仍是不雅

I don't know a way of validating without the exception, but you can change the debugger settings to only break for XmlException if it's unhandled - that should solve your immediate issues, even if the code is still inelegant.

要做到这一点，去调试/例外... /公共语言运行库异常和查找System.Xml.XmlException，然后确保只有用户未处理勾选（没有抛出）。

To do this, go to Debug / Exceptions... / Common Language Runtime Exceptions and find System.Xml.XmlException, then make sure only "User-unhandled" is ticked (not Thrown).

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