验证.NET中的XPath

Question

如何在C#/ .NET中验证给定的xpath字符串是否有效？

我不确定只是运行XPath并且捕获异常是一个有效的解决方案(把胆汁放在我的喉咙里一会儿) - 如果明天我遇到其他输入我还没有测试过怎么办？

Answer 1

如何在C#/ .NET中验证给定的XPath字符串是否有效？

您尝试从中构建XPathExpression并捕获异常.

try 
{
    XPathExpression.Compile(xPathString);
}
catch (XPathException ex)
{
    MessageBox.Show("XPath syntax error: " + ex.Message);
}

Answer 2

答案非常接近Tomalak写的内容(修复了编译错误并将强制主体置于XML中):

public static class XPathValidator
{
    /// <summary>
    /// Throws an XPathException if <paramref name="xpath"/> is not a valid XPath
    /// </summary>
    public static void Validate(string xpath)
    {
        using (MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes("<xml></xml>")))
        {
            XPathDocument doc = new XPathDocument(stream);
            XPathNavigator nav = doc.CreateNavigator();
            nav.Compile(xpath);
        }
    }
}

Answer 3

对于比@ Tomalak的答案更短的版本,您可以使用XPathExpression.Compile方法:

string xpath = "/some/xpath";

try
{
    XPathExpression expr = XPathExpression.Compile(xpath);
}
catch (XPathException)
{

}