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//------------------------------------------------------------------------------
// <copyright file="ProvidersHelper.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Configuration
{
using System.Configuration;
using System.Configuration.Provider;
using System.Web.Compilation;
using System.Collections.Specialized;
using System;
using System.Security;
using System.Security.Permissions;
public static class ProvidersHelper {
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Low)]
public static ProviderBase InstantiateProvider(ProviderSettings providerSettings, Type providerType)
{
ProviderBase provider = null;
try {
string pnType = (providerSettings.Type == null) ? null : providerSettings.Type.Trim();
if (string.IsNullOrEmpty(pnType))
throw new ArgumentException(SR.GetString(SR.Provider_no_type_name));
Type t = ConfigUtil.GetType(pnType, "type", providerSettings, true, true);
if (!providerType.IsAssignableFrom(t))
throw new ArgumentException(SR.GetString(SR.Provider_must_implement_type, providerType.ToString()));
provider = (ProviderBase)HttpRuntime.CreatePublicInstance(t);
// Because providers modify the parameters collection (i.e. delete stuff), pass in a clone of the collection
NameValueCollection pars = providerSettings.Parameters;
NameValueCollection cloneParams = new NameValueCollection(pars.Count, StringComparer.Ordinal);
foreach (string key in pars)
cloneParams[key] = pars[key];
provider.Initialize(providerSettings.Name, cloneParams);
} catch (Exception e) {
if (e is ConfigurationException)
throw;
throw new ConfigurationErrorsException(e.Message, e, providerSettings.ElementInformation.Properties["type"].Source, providerSettings.ElementInformation.Properties["type"].LineNumber);
}
return provider;
}
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Low)]
internal static ProviderBase InstantiateProvider(NameValueCollection providerSettings, Type providerType) {
ProviderBase provider = null;
try {
string pnName = GetAndRemoveStringValue(providerSettings, "name");
string pnType = GetAndRemoveStringValue(providerSettings, "type");
if (string.IsNullOrEmpty(pnType))
throw new ArgumentException(SR.GetString(SR.Provider_no_type_name));
Type t = ConfigUtil.GetType(pnType, "type", null, null, true, true);
if (!providerType.IsAssignableFrom(t))
throw new ArgumentException(SR.GetString(SR.Provider_must_implement_type, providerType.ToString()));
provider = (ProviderBase)HttpRuntime.CreatePublicInstance(t);
// Because providers modify the parameters collection (i.e. delete stuff), pass in a clone of the collection
NameValueCollection cloneParams = new NameValueCollection(providerSettings.Count, StringComparer.Ordinal);
foreach (string key in providerSettings)
cloneParams[key] = providerSettings[key];
provider.Initialize(pnName, cloneParams);
}
catch (Exception e) {
if (e is ConfigurationException)
throw;
throw new ConfigurationErrorsException(e.Message, e);
}
return provider;
}
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Low)]
public static void InstantiateProviders(ProviderSettingsCollection configProviders, ProviderCollection providers, Type providerType)
{
foreach (ProviderSettings ps in configProviders) {
providers.Add(InstantiateProvider(ps, providerType));
}
}
private static string GetAndRemoveStringValue(NameValueCollection collection, string key) {
string strValue = collection[key] as string;
if (!string.IsNullOrEmpty(strValue))
strValue = strValue.Trim();
collection.Remove(key);
return strValue;
}
}
}
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