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namespace System.Web.ModelBinding {
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
public class ValueProviderCollection : Collection<IValueProvider>, IValueProvider, IUnvalidatedValueProvider {
public ValueProviderCollection() {
}
public ValueProviderCollection(IList<IValueProvider> list)
: base(list) {
}
public virtual bool ContainsPrefix(string prefix) {
return this.Any(vp => vp.ContainsPrefix(prefix));
}
public virtual ValueProviderResult GetValue(string key) {
return GetValue(key, skipValidation: false);
}
public virtual ValueProviderResult GetValue(string key, bool skipValidation) {
return (from provider in this
let result = GetValueFromProvider(provider, key, skipValidation)
where result != null
select result).FirstOrDefault();
}
internal static ValueProviderResult GetValueFromProvider(IValueProvider provider, string key, bool skipValidation) {
// Since IUnvalidatedValueProvider is a superset of IValueProvider, it's always OK to use the
// IUnvalidatedValueProvider-supplied members if they're present. Otherwise just call the
// normal IValueProvider members.
IUnvalidatedValueProvider unvalidatedProvider = provider as IUnvalidatedValueProvider;
return (unvalidatedProvider != null) ? unvalidatedProvider.GetValue(key, skipValidation) : provider.GetValue(key);
}
protected override void InsertItem(int index, IValueProvider item) {
if (item == null) {
throw new ArgumentNullException("item");
}
base.InsertItem(index, item);
}
protected override void SetItem(int index, IValueProvider item) {
if (item == null) {
throw new ArgumentNullException("item");
}
base.SetItem(index, item);
}
}
}
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