Question

我有一个xml字符串，其中包含我想要屏蔽的某些值。我还有一个黑名单列表，其中包含我想要屏蔽的元素或属性的名称。我怎么能用Linq做到这一点？

var BlackList=new List<string>{"ssn", "dateofbirth"};

var xml=@"<Rows><Row><SSN>123-12-1234</SSN><Address>123 Somewhere Street</Address><DateOfBirth>12-12-2012</DateOfBirth></Row><Row><SSN value=""123-12-1234""/><Address value=""123 Somewhere Street""/><DateOfBirth value=""12-12-2012""/></Row></Rows>";

结果集如下所示：

"<Rows><Row><SSN>RemovedForSecurity</SSN><Address>123 Somewhere Street</Address><DateOfBirth>RemovedForSecurity</DateOfBirth></Row><Row><SSN value="RemovedForSecurity"/><Address value="123 Somewhere Street"/><DateOfBirth value="RemovedForSecurity"/></Row></Rows>"

Answer 1

首先，使用LINQ to XML获取所有实际的XML。你开始使用字符串并最终得到一个字符串的事实是偶然的：你真的试图操纵XML文档。那时候这很容易：

var redactedElements = new HashSet<XName>
{
    "SSN",
    "CreditCard"
};
var redactedAttributes = new HashSet<XName>
{
    "dateofbirth",
    ...
};

var elements = doc.Descendants()
                  .Where(x => redactedElements.Contains(x.Name))
                  .ToList();
foreach (var element in elements)
{
    element.Value = "RemovedForSecurity";
}

var attributes = doc.Descendants()
                    .Attributes()
                    .Where(x => redactedAttributes.Contains(x.Name))
                    .ToList();
foreach (var attribute in attributes)
{
    attribute.Value = "RemovedForSecurity";
}

编辑：为了区分大小写，您将保留一个不区分大小写的本地名称列表：

var redactedElements = new HashSet<string>(StringEqualityComparer.OrdinalIgnoreCase);
{
    "SSN",
    "CreditCard"
};
var elements = doc.Descendants()
                  .Where(x => redactedElements.Contains(x.Name.LocalName))
                  .ToList();
// Ditto for the attributes

如果你指定了确切的名字，那会更好，IMO。

Answer 2

var unsecureElements = 
    XElement.Parse(xml)
            .Descendants()
            .Where(n => blackList.Contains(n.Name.LocalName.ToLower()));

foreach (var element in unsecureElements)
{
    var valueAttribute = element.Attribute("value");

    if (valueAttribute != null) // check if unsecure element has value attribute
        valueAttribute.SetValue("RemovedForSecurity");
    else
        element.Value = "RemovedForSecurity";
}

Mask元素\属性值，使用Linq

2 个答案: