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using System;
using System.Linq;
using System.Reflection;
using System.Xml;
namespace Xamarin.Forms.Xaml
{
[ContentProperty(nameof(Member))]
public class StaticExtension : IMarkupExtension
{
public string Member { get; set; }
public object ProvideValue(IServiceProvider serviceProvider)
{
IXmlLineInfoProvider lineInfoProvider;
IXmlLineInfo lineInfo;
if (serviceProvider == null)
throw new ArgumentNullException(nameof(serviceProvider));
var typeResolver = serviceProvider.GetService(typeof (IXamlTypeResolver)) as IXamlTypeResolver;
if (typeResolver == null)
throw new ArgumentException("No IXamlTypeResolver in IServiceProvider");
if (string.IsNullOrEmpty(Member) || !Member.Contains("."))
{
lineInfoProvider = serviceProvider.GetService(typeof (IXmlLineInfoProvider)) as IXmlLineInfoProvider;
lineInfo = (lineInfoProvider != null) ? lineInfoProvider.XmlLineInfo : new XmlLineInfo();
throw new XamlParseException("Syntax for x:Static is [Member=][prefix:]typeName.staticMemberName", lineInfo);
}
var dotIdx = Member.LastIndexOf('.');
var typename = Member.Substring(0, dotIdx);
var membername = Member.Substring(dotIdx + 1);
var type = typeResolver.Resolve(typename, serviceProvider);
var pinfo = type.GetRuntimeProperties().FirstOrDefault(pi => pi.Name == membername && pi.GetMethod.IsStatic);
if (pinfo != null)
return pinfo.GetMethod.Invoke(null, new object[] { });
var finfo = type.GetRuntimeFields().FirstOrDefault(fi => fi.Name == membername && fi.IsStatic);
if (finfo != null)
return finfo.GetValue(null);
lineInfoProvider = serviceProvider.GetService(typeof (IXmlLineInfoProvider)) as IXmlLineInfoProvider;
lineInfo = (lineInfoProvider != null) ? lineInfoProvider.XmlLineInfo : new XmlLineInfo();
throw new XamlParseException($"No static member found for {Member}", lineInfo);
}
}
}
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