如何在调用 .LoadXml() 之前检查字符串输入中的有效 xml [英] How to check for valid xml in string input before calling .LoadXml()

问题描述

我更愿意这样做而不在 LoadXml() 中捕获异常并将此结果用作我的逻辑的一部分.关于不涉及自己手动解析 xml 的解决方案的任何想法?我认为 VB 对此函数的返回值为 false 而不是抛出 XmlException.Xml 输入由用户提供.非常感谢！

I would much prefer to do this without catching an exception in LoadXml() and using this results as part of my logic. Any ideas for a solution that doesn't involve manually parsing the xml myself? I think VB has a return value of false for this function instead of throwing an XmlException. Xml input is provided from the user. Thanks much!

if (!loaded)
{
     this.m_xTableStructure = new XmlDocument();
     try
     {
          this.m_xTableStructure.LoadXml(input);
          loaded = true;
     }
     catch
     {
          loaded = false;
     }
}

推荐答案

只需捕获异常即可.与解析 XML 相比，捕获异常的小开销淹没了.

Just catch the exception. The small overhead from catching an exception drowns compared to parsing the XML.

如果您想要该功能(出于风格原因，而不是为了性能)，请自行实现:

If you want the function (for stylistic reasons, not for performance), implement it yourself:

public class MyXmlDocument: XmlDocument
{
  bool TryParseXml(string xml){
    try{
      ParseXml(xml);
      return true;
    }catch(XmlException e){
      return false;
    }
 }

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