Cleans the Xml element with the attribut “nil=true” - Create linq version?
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28-04-2021 - |
Pregunta
I'm trying to cleans the Xml element with the attribut "nil=true" inside a document. I come up with this algo but I don't like how it's look.
Do anyone know a linq version of this algo?
/// <summary>
/// Cleans the Xml element with the attribut "nil=true".
/// </summary>
/// <param name="value">The value.</param>
public static void CleanNil(this XElement value)
{
List<XElement> toDelete = new List<XElement>();
foreach (var element in value.DescendantsAndSelf())
{
if (element != null)
{
bool blnDeleteIt = false;
foreach (var attribut in element.Attributes())
{
if (attribut.Name.LocalName == "nil" && attribut.Value == "true")
{
blnDeleteIt = true;
}
}
if (blnDeleteIt)
{
toDelete.Add(element);
}
}
}
while (toDelete.Count > 0)
{
toDelete[0].Remove();
toDelete.RemoveAt(0);
}
}
Solución
What's the namespace of the nil
attribute? Put that inside { } like this:
public static void CleanNil(this XElement value)
{
value.Descendants().Where(x=> (bool?)x.Attribute("{http://www.w3.org/2001/XMLSchema-instance}nil") == true).Remove();
}
Otros consejos
This should work..
public static void CleanNil(this XElement value)
{
var todelete = value.DescendantsAndSelf().Where(x => (bool?) x.Attribute("nil") == true);
if(todelete.Any())
{
todelete.Remove();
}
}
The extension method:
public static class Extensions
{
public static void CleanNil(this XElement value)
{
value.DescendantsAndSelf().Where(x => x.Attribute("nil") != null && x.Attribute("nil").Value == "true").Remove();
}
}
Sample usage:
File.WriteAllText("test.xml", @"
<Root nil=""false"">
<a nil=""true""></a>
<b>2</b>
<c nil=""false"">
<d nil=""true""></d>
<e nil=""false"">4</e>
</c>
</Root>");
var root = XElement.Load("test.xml");
root.CleanNil();
Console.WriteLine(root);
output:
<Root nil="false">
<b>2</b>
<c nil="false">
<e nil="false">4</e>
</c>
</Root>
as you can see, nodes <a>
and <d>
where removed as expected. The only thing to note is that you cannot call this method on the <Root>
node because the root node cannot be removed, and you will get this run-time error:
The parent is missing.
I change my way to solve that issue and avoid to create nil on my nullable type I use the following
http://msdn.microsoft.com/en-us/library/system.xml.serialization.xmlserializer%28v=vs.90%29.aspx
public class OptionalOrder
{
// This field should not be serialized
// if it is uninitialized.
public string FirstOrder;
// Use the XmlIgnoreAttribute to ignore the
// special field named "FirstOrderSpecified".
[System.Xml.Serialization.XmlIgnoreAttribute]
public bool FirstOrderSpecified;
}