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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Dynamic;
using System.Web.WebPages.Resources;
namespace System.Web.WebPages
{
internal class DynamicHttpApplicationState : DynamicObject
{
private HttpApplicationStateBase _state;
public DynamicHttpApplicationState(HttpApplicationStateBase state)
{
_state = state;
}
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
result = _state[binder.Name];
// We return true here because HttpApplicationState returns null if the key is not
// in the dictionary, so we simply pass on the returned value.
return true;
}
public override bool TrySetMember(SetMemberBinder binder, object value)
{
_state[binder.Name] = value;
return true;
}
public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
{
if (indexes == null || indexes.Length != 1)
{
throw new ArgumentException(WebPageResources.DynamicDictionary_InvalidNumberOfIndexes);
}
result = null;
string key = indexes[0] as string;
if (key != null)
{
result = _state[key];
}
else if (indexes[0] is int)
{
result = _state[(int)indexes[0]];
}
else
{
// HttpApplicationState only supports keys of type string and int when getting values, so any attempt
// to use other types will result in an error. We throw an exception here to explain to the user what is wrong.
// Returning false will instead cause a runtime binder exception which might be confusing to the user.
throw new ArgumentException(WebPageResources.DynamicHttpApplicationState_UseOnlyStringOrIntToGet);
}
return true;
}
public override bool TrySetIndex(SetIndexBinder binder, object[] indexes, object value)
{
if (indexes == null || indexes.Length != 1)
{
throw new ArgumentException(WebPageResources.DynamicDictionary_InvalidNumberOfIndexes);
}
string key = indexes[0] as string;
if (key != null)
{
_state[key] = value;
return true;
}
else
{
// HttpApplicationState only supports keys of type string when setting values, so any attempt
// to use other types will result in an error. We throw an exception here to explain to the user what is wrong.
// Returning false will instead cause a runtime binder error which might be confusing to the user.
throw new ArgumentException(WebPageResources.DynamicHttpApplicationState_UseOnlyStringToSet);
}
}
}
}
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