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namespace System.Web.ModelBinding {
using System;
using System.Collections.Generic;
using System.Globalization;
[AttributeUsage(AttributeTargets.Parameter, Inherited = false, AllowMultiple = false)]
public sealed class SessionAttribute : ValueProviderSourceAttribute {
public string Name {
get;
private set;
}
public SessionAttribute()
: this(null) {
}
public SessionAttribute(string name) {
Name = name;
}
public override IValueProvider GetValueProvider(ModelBindingExecutionContext modelBindingExecutionContext) {
if (modelBindingExecutionContext == null) {
throw new ArgumentNullException("modelBindingExecutionContext");
}
HttpSessionStateBase session = modelBindingExecutionContext.HttpContext.Session;
if (session == null) {
// session is disabled
return null;
}
Dictionary<string, object> backingStore = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
foreach (string key in session) {
if (key != null) {
backingStore[key] = session[key]; // copy to backing store
}
}
// use the invariant culture since Session contains serialized objects
return new DictionaryValueProvider<object>(backingStore, CultureInfo.InvariantCulture);
}
public override string GetModelName() {
return Name;
}
}
}
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