private string ComputeVaryCacheKey(HashCodeCombiner combinedHashCode,
ControlCachedVary cachedVary)
{
// Add something to the has to differentiate it from the non-vary hash.
// This is needed in case this method doesn't add anything else to the hash (VSWhidbey 194199)
combinedHashCode.AddInt(1);
// Get the request value collection
NameValueCollection reqValCollection;
HttpRequest request = Page.Request;
if (request != null && request.HttpVerb == HttpVerb.POST)
{
//
reqValCollection = new NameValueCollection(request.QueryString);
reqValCollection.Add(request.Form);
}
else
{
// Use the existing value if possible to avoid recreating a NameValueCollection
reqValCollection = Page.RequestValueCollection;
// If it's not set, get it based on the method
if (reqValCollection == null)
{
reqValCollection = Page.GetCollectionBasedOnMethod(true /*dontReturnNull*/);
}
}
if (cachedVary._varyByParams != null)
{
ICollection itemsToUseForHashCode;
// If '*' was specified, use all the items in the request collection.
// Otherwise, use only those specified.
if (cachedVary._varyByParams.Length == 1 && cachedVary._varyByParams[0] == "*")
{
itemsToUseForHashCode = reqValCollection;
}
else
{
itemsToUseForHashCode = cachedVary._varyByParams;
}
// Add the items and their values to compute the hash code
foreach (string varyByParam in itemsToUseForHashCode)
{
// Note: we use to ignore certain system fields here (like VIEWSTATE), but decided
// not to for consistency with pahe output caching (VSWhidbey 196267, 479252)
combinedHashCode.AddCaseInsensitiveString(varyByParam);
string val = reqValCollection[varyByParam];
if (val != null)
{
combinedHashCode.AddObject(val);
}
}
}
if (cachedVary._varyByControls != null)
{
// Prepend them with a prefix to make them fully qualified
string prefix;
if (NamingContainer == Page)
{
// No prefix if it's the page
prefix = String.Empty;
}
else
{
prefix = NamingContainer.UniqueID;
Debug.Assert(!String.IsNullOrEmpty(prefix));
prefix += IdSeparator;
}
prefix += _ctrlID + IdSeparator;
// Add all the relative vary params and their values to the hash code
foreach (string varyByParam in cachedVary._varyByControls)
{
string temp = prefix + varyByParam.Trim();
combinedHashCode.AddCaseInsensitiveString(temp);
string val = reqValCollection[temp];
if (val != null)
{
combinedHashCode.AddObject(reqValCollection[temp]);
}
}
}
if (cachedVary._varyByCustom != null)
{
string customString = Context.ApplicationInstance.GetVaryByCustomString(
Context, cachedVary._varyByCustom);
if (customString != null)
{
combinedHashCode.AddObject(customString);
}
}
return(CacheInternal.PrefixPartialCachingControl + combinedHashCode.CombinedHashString);
}
// Return the key used to cache the output
private string GetCacheKey()
{
// Create a cache key by combining various elements
HashCodeCombiner combinedHashCode = new HashCodeCombiner();
// Start with the guid
combinedHashCode.AddObject(_guid);
// Make the key vary based on the type of the writer (ASURT 118922)
HttpBrowserCapabilities browserCap = Context.Request.Browser;
if (browserCap != null)
{
combinedHashCode.AddObject(browserCap.TagWriter);
}
// If there are no vary params, we're done with the key
if (_varyByParamsCollection == null && _varyByControlsCollection == null && _varyByCustom == null)
{
return(combinedHashCode.CombinedHashString);
}
// Get the request value collection
NameValueCollection reqValCollection = Page.RequestValueCollection;
// If it's not set, get it based on the method
if (reqValCollection == null)
{
reqValCollection = Page.GetCollectionBasedOnMethod();
}
if (_varyByParamsCollection != null)
{
ICollection itemsToUseForHashCode;
// If '*' was specified, use all the items in the request collection.
// Otherwise, use only those specified.
if (_varyByParamsCollection.Length == 1 && _varyByParamsCollection[0] == "*")
{
itemsToUseForHashCode = reqValCollection;
}
else
{
itemsToUseForHashCode = _varyByParamsCollection;
}
// Add the items and their values to compute the hash code
foreach (string varyByParam in itemsToUseForHashCode)
{
combinedHashCode.AddCaseInsensitiveString(varyByParam);
string val = reqValCollection[varyByParam];
if (val != null)
{
combinedHashCode.AddObject(reqValCollection[varyByParam]);
}
}
}
if (_varyByControlsCollection != null)
{
// Prepend them with a prefix to make them fully qualified
string prefix = NamingContainer.UniqueID;
if (prefix != null)
{
prefix += Control.ID_SEPARATOR;
}
prefix += _ctrlID + Control.ID_SEPARATOR;
// Add all the relative vary params and their values to the hash code
foreach (string varyByParam in _varyByControlsCollection)
{
string temp = prefix + varyByParam;
combinedHashCode.AddCaseInsensitiveString(temp);
string val = reqValCollection[temp];
if (val != null)
{
combinedHashCode.AddObject(reqValCollection[temp]);
}
}
}
if (_varyByCustom != null)
{
string customString = Context.ApplicationInstance.GetVaryByCustomString(
Context, _varyByCustom);
if (customString != null)
{
combinedHashCode.AddObject(customString);
}
}
return(combinedHashCode.CombinedHashString);
}
