Cache_dependenc y_used_more_tha t_once Exception when adding to .NET cache

[mahesh.prasad]

Hi,

I'm trying to add an object to the .NET cache using a CacheDependency
and I get the following exception :

System.InvalidO perationExcepti on: Cache_dependenc y_used_more_tha t_once
at System.Web.Cach ing.CacheEntry. MonitorDependen cyChanges()
at System.Web.Cach ing.CacheSingle .UpdateCache(Ca cheKey cacheKey,
CacheEntry newEntry, Boolean replace, CacheItemRemove dReason
removedReason, Object& valueOld)
at System.Web.Cach ing.CacheMultip le.UpdateCache( CacheKey cacheKey,
CacheEntry newEntry, Boolean replace, CacheItemRemove dReason
removedReason, Object& valueOld)
at System.Web.Cach ing.CacheIntern al.DoInsert(Boo lean isPublic,
String key, Object value, CacheDependency dependencies, DateTime
utcAbsoluteExpi ration, TimeSpan slidingExpirati on, CacheItemPriori ty
priority, CacheItemRemove dCallback onRemoveCallbac k, Boolean replace)
at System.Web.Cach ing.Cache.Inser t(String key, Object value,
CacheDependency dependencies, DateTime absoluteExpirat ion, TimeSpan
slidingExpirati on, CacheItemPriori ty priority,
CacheItemRemove dCallback onRemoveCallbac k)

I've not seen this error before...and I couldn't find reference to
this error message either on Google or MSDN.
Does anyone know what could cause the
"Cache_dependen cy_used_more_th at_once" exception to happen.

Thanks
Mahesh

[=?Utf-8?B?UGV0ZXIgQnJvbWJlcmcgW0MjIE1WUF0=?=]

Decompiled:

internal void MonitorDependen cyChanges()
{
CacheDependency dependency1 = this._dependenc y;
if ((dependency1 != null) && (this.State ==
CacheEntry.Entr yState.AddedToC ache))
{
if (!dependency1.U se())
{
throw new
InvalidOperatio nException(SR.G etString("Cache _dependency_use d_more_that_onc e"));
}
dependency1.Set CacheDependency Changed(this);
}
}

In other words, it is trying to use the dependency but it is alread in use
(probably from another part of your code is my guess).
Peter

--
Site: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
Short urls & more: http://ittyurl.net


"ma***********@ gmail.com" wrote:

Hi,

I'm trying to add an object to the .NET cache using a CacheDependency
and I get the following exception :

System.InvalidO perationExcepti on: Cache_dependenc y_used_more_tha t_once
at System.Web.Cach ing.CacheEntry. MonitorDependen cyChanges()
at System.Web.Cach ing.CacheSingle .UpdateCache(Ca cheKey cacheKey,
CacheEntry newEntry, Boolean replace, CacheItemRemove dReason
removedReason, Object& valueOld)
at System.Web.Cach ing.CacheMultip le.UpdateCache( CacheKey cacheKey,
CacheEntry newEntry, Boolean replace, CacheItemRemove dReason
removedReason, Object& valueOld)
at System.Web.Cach ing.CacheIntern al.DoInsert(Boo lean isPublic,
String key, Object value, CacheDependency dependencies, DateTime
utcAbsoluteExpi ration, TimeSpan slidingExpirati on, CacheItemPriori ty
priority, CacheItemRemove dCallback onRemoveCallbac k, Boolean replace)
at System.Web.Cach ing.Cache.Inser t(String key, Object value,
CacheDependency dependencies, DateTime absoluteExpirat ion, TimeSpan
slidingExpirati on, CacheItemPriori ty priority,
CacheItemRemove dCallback onRemoveCallbac k)

I've not seen this error before...and I couldn't find reference to
this error message either on Google or MSDN.
Does anyone know what could cause the
"Cache_dependen cy_used_more_th at_once" exception to happen.

Thanks
Mahesh

[Mahesh Prasad]

Hi Peter,

Thanks for the reply! I was doing the following :

_cache.Insert(" dep","dependenc y");

string[] depKey = {"dep"};
CacheDependency cdep = new CacheDependency (null,depKey);

_cache.Insert(" 1","one",cdep,. ..);
_cache.Insert(" 2","two",cdep,. .);

I thought we could use the same CacheDependency object for more than
one keys; seems like we cannot (btw it would be interesting to know
why it was designed this way)
The code worked after I changed to this...

_cache.Insert(" dep","dependenc y");
string[] depKey = {"dep"};

CacheDependency cdep1 = new CacheDependency (null,depKey);
_cache.Insert(" 1","one",cdep1, ...);

CacheDependency cdep2 = new CacheDependency (null,depKey);
_cache.Insert(" 2","two",cdep2, ..);

Thanks again for your help.

-Mahesh

On Feb 16, 1:10 pm, Peter Bromberg [C# MVP]
<pbromb...@yaho o.yabbadabbadoo .comwrote:

Decompiled:

internal void MonitorDependen cyChanges()
{
CacheDependency dependency1 = this._dependenc y;
if ((dependency1 != null) && (this.State ==
CacheEntry.Entr yState.AddedToC ache))
{
if (!dependency1.U se())
{
throw new
InvalidOperatio nException(SR.G etString("Cache _dependency_use d_more_that_onc e"));
}
dependency1.Set CacheDependency Changed(this);
}

}

In other words, it is trying to use the dependency but it is alread in use
(probably from another part of your code is my guess).
Peter

--
Site: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
Short urls & more: http://ittyurl.net

"mahesh.pra...@ gmail.com" wrote:

Hi,

I'm trying to add an object to the .NET cache using a CacheDependency
and I get the following exception :

System.InvalidO perationExcepti on: Cache_dependenc y_used_more_tha t_once
at System.Web.Cach ing.CacheEntry. MonitorDependen cyChanges()
at System.Web.Cach ing.CacheSingle .UpdateCache(Ca cheKey cacheKey,
CacheEntry newEntry, Boolean replace, CacheItemRemove dReason
removedReason, Object& valueOld)
at System.Web.Cach ing.CacheMultip le.UpdateCache( CacheKey cacheKey,
CacheEntry newEntry, Boolean replace, CacheItemRemove dReason
removedReason, Object& valueOld)
at System.Web.Cach ing.CacheIntern al.DoInsert(Boo lean isPublic,
String key, Object value, CacheDependency dependencies, DateTime
utcAbsoluteExpi ration, TimeSpan slidingExpirati on, CacheItemPriori ty
priority, CacheItemRemove dCallback onRemoveCallbac k, Boolean replace)
at System.Web.Cach ing.Cache.Inser t(String key, Object value,
CacheDependency dependencies, DateTime absoluteExpirat ion, TimeSpan
slidingExpirati on, CacheItemPriori ty priority,
CacheItemRemove dCallback onRemoveCallbac k)

I've not seen this error before...and I couldn't find reference to
this error message either on Google or MSDN.
Does anyone know what could cause the
"Cache_dependen cy_used_more_th at_once" exception to happen.

Thanks
Mahesh