How to get the value in an xml section, and if not present set the value as null?
I have an xml file like this:
<?xml version="1.0" encoding="utf-8"?>
<EffectFile>
<Effects>
<Effect>
<Type>Blur</Type>
</Effect>
开发者_Go百科 <Effect>
<Type>Sharpen</Type>
</Effect>
<Effect>
<Type>Zoom</Type>
<Options>
<Option>88</Option>
<Option>"miles"</Option>
</Options>
</Effect>
</Effects>
</EffectFile>
which I am parsing it like this:
xElement.Elements ( "Effects" ).Elements ( "Effect" ).Select (
e => new Effect (
( EffectType ) Enum.Parse ( typeof ( EffectType ), ( string ) e.Elements ( "Type" ).FirstOrDefault ( ) ),
e.Elements ( "Options" ).Select ( p => ( object ) p.Elements ( "Option" ) ) ) );
But with this version every Effect
gets at least an empty EffectOptions
value. Is there a way to specify if there is no Options
section for an Effect
, the value should be collected as null?
The Effect
type has a constructor like this:
new Effect (EffectType type, EffectOptions options)
so just want to pass null to the second parameter if there are no Options
section.
Just use Any()
:
e.Elements("Options").Any()
? e.Elements("Options").Select (p => (object) p.Elements("Option"))
: null )
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