Retrieving several values from a xml node (xpath)

Question

This is part of a xml document:

<directory level="Beginner">
    <cel row="0" column="0" visible="no">2</cel>
</directory>

How can i exactly put those 3 values in a string?

Every time my string returns null. Xpath xpression as following:

string xpath = "//directory[@level='" + directoryLevel+ "'] /cel[@row='" + amountOfRows + "' and @column='" + amountOfColumns+ "']";

The error has to be somewhere around the "and" (2nd attribute), because if i leave that part out the string is not null anymore.

How exactly can i get the value of column into my string and what causes this error?

Best Regards.

Answer 1

尝试将“ and”替换为“] [”，如下所示：

string xpath = "//directory[@level='" + directoryLevel+ "']/cel[@row='" + amountOfRows + "'][@column='" + amountOfColumns+ "']";

Answer 2

It appears to be valid xpath so I am not sure what the problem is. I tested around a little with the xml and static text and was able to build the following xpath statement which works fine:

//directory[@level='Beginner']/cel[(@row='0') and (@column='0')]

Could the problem be related to your variables and not xpath? Are you absolutely sure "amountOfRows" and "amountOfColumns" have the values you expect?

Answer 3

It looks like your problem is somewhere else. I wrote the following code:

XmlDocument document = new XmlDocument();
document.LoadXml("<directory level=\"Beginner\"><cel row=\"0\" column=\"0\" visible=\"no\">2</cel></directory>");

string directoryLevel = "Beginner";
string amountOfRows = "0";
string amountOfColumns = "0";

string xpath = "//directory[@level='" + directoryLevel+ "']/cel[@row='" + amountOfRows + "' and @column='" + amountOfColumns+ "']";
XmlNode node = document.SelectSingleNode(xpath);

Console.WriteLine(node.OuterXml);

The output was:

<cel row="0" column="0" visible="no">2</cel>

Conclusion: the xpath expression works as expected.