What is a xname xname? (With Code Example)

What is a xname xname? (With Code Example)

What is a xname naming Elements Without x:Name The casing syntax can be utilized to name components, yet a few classes characterize their Name property that can be treated as the component's name. So, what is a xname you can name the preceding the OK button as follows, without the x: prefix:

<Button Name *okButton">X</Buttons

What is a xname?

What is a xname You can use either segment, be that as it may, you can't use both simultaneously. Actually. XAML's idea of names (with x: Name) and the Ul system's idea of names (with Name) are autonomous, however by and by, it is entirely expected to treat them conversely.

Supporting Compiled XAML with Any .NET Language

In the event that you need to use XAML assemblage with a subjective .NET language, there are two fundamental prerequisites for empowering this: having a relating CodeDom supplier and having an MSBuild target document. In addition, language support for halfway classes is useful yet not carefully required.

A brief design about design 

A portion of the design decisions made here merit a touch of conversation the first is the decision to make XName instances legitimately from strings (through the overloaded conversion operator) rather than the regular method of overloading the Element constructors and techniques to take either a string or a NaNante.

xname xname lname

It makes it simpler to characterize the techniques accurately and yields a bit of economy, however it's harder to see how everything functions. It very well maybe a bit befuddling when IntelliSense shows you a technique that takes a name and you can't make sense of how to make one. The subsequent choice was to have the option to make XNamespace instances straightforwardly from strings.

Namespaces are rarely created, and they aren’t done inline in the XML creation code, so there is little benefit of not doing this with a simple constructor the final decision is to create an XName from a Namespace and a string, using the addition operator. This allows the developer to write the following:

var element new XElement(namespace + “books”); which is a little shorter than the alternative but arguably not quite as clear. var element new XElement(namespace. GetName(“books”)); In sum, I think the overall design is just a little bit too dever and would prefer that it was a bit more conventional even at a slight cost to readability. You’ll see examples of using some of these axis methods over the chapter. However, here is a quick example:

Private Sub DeleteNodeFromDoc()
Dim doc As New XElement("Inventory",
New XElement("Car", New XAttribute("id", "2000"),
New XElement("PetName", "Jimbo),
New XElement("Color", "Red"),
New XElement("Make", "Ford")))
Delete the PetNane element from the tree.
doc. Descendants("PetName"). Remove()
Console.WriteLine(doc)
End Sub

If you invoke this method, you’d see the following “pruned” XML tree:

Red</Color
Ford
</Cars
</Inventory
The Oddness of XName (and XNamespace)

If you examine the signatures of the LINQ to XML. axis methods (or the identically named members of the container), you’ll notice that they typically require you to specify what looks to be a Name object. Consider the significance of the Descendants () method defined by XContainer:

Public Function Descendants (ByVal name As Xane) As Tenumerable(OF XElement) Nane is “odd” in that you will never really directly make use of it in your code. Since this
class has no Public constructor, you cannot make an XName objectError! Can’t make XName objects! doc. Descendants (New XName(“PetName)).Remove()

If you were to view the formal definition of XName, you will see that this class defines a custom implicit conversion operator (see Chapter 12 for information on defining custom conversion operators), which will map a simple System. String to the correct XName object:

Axis Method Filters 

All of the preceding examples return all elements meeting the criteria of the axis method, but you have more control than that through overloads that allow you to filter the results further. For example.

DescendantsAnd Selfname") would return the name element under the
product and the axis element where the element tag name is "name":
var descendant Nameandseif . axes.DescendantsAndSelf ("name");
foreach (var element in descendant NameAndselt)
Console.WriteLine(element);

Notice that the call to Descendants and Self passes in the string argument, “name”, which is a string but the parameter type is XName. Like XNamespace, XName has an implicit string conversion operator. In addition to overloads with no parameters, some of the axis methods have overloads that will accept an XName argument, just like Descendants and Self. The XName argument filters the results to only elements with matching tags. The output is shown next: Zune.

xname xname xname xname

It’s important to recognize that the preceding element does not contain the aris element and that the tag for the element names. This demonstrates how XName arguments to axis methods work. The axis method invoked was Descendants and Self, which would have returned the axis element and all child nodes if called without parameters.

However, the XName argument “name” is passed in this example. Since the tag for the axis element is a product, there isn’t a match and the axis element is filtered out of the results. The child name element is included, as you can see in the results, but the list Price element isn’t included in the results because its tag doesn’t match the filter. Now that you know how to find any element in an XML document, you need to know how to manipulate the contents of the XML document, which is covered next.