Retrieving Previously Tagged Data

To utilize the APIs, include the following namespace in your application: Alachisoft.NCache.Runtime.Caching.

Retrieving Keys Associated with a Tag

The following example demonstrates how to retrieve keys from the cache, either related to a specified tag, any tag from the list, or all the tags in the list.

  //For finding keys related to one tags
  ICollection keys = cache.GetKeysByTag(productTags[0]);

  //For Finding keys containing at least any one tag from tag list.
  ICollection keys = cache.GetKeysByAnyTag(productTags);

  //For finding keys containing all tags from tag list.
  ICollection keys = cache.GetKeysByAllTags(productTags);

Retrieving Key from Cache Containing Tag

The following examples demonstrate how to retrieve items (keys and values) from the cache, either containing a specified tag, any tag from the list, or all the tags in the list.

  //For finding keys and values related to one tag.
  Hashtable result = cache.GetByTag(productTags[0]);

  //For finding keys and values containing at least any one tag in the tag list
  Hashtable result = cache.GetByAnyTag(productTags);

  //For finding keys and values related to all tags from the tag list
  Hashtable result = cache.GetByAllTags(productTags);

Querying Cached Items with respect to Tags

To utilize the APIs, include the following namespace in your application: Alachisoft.NCache.Runtime.Caching.

In the following code example, please specify the fully qualified name of your custom class instead of Product in the query string.

Hashtable queryValue = new Hashtable();

string query = "SELECT Product WHERE this.$Tag$=? AND this.$Tag$=?";

//Add items to cache containing tags in ArrayList if multiple tags value is required.
ArrayList queryTagList = new ArrayList();
queryTagList.Add("Product");
queryTagList.Add("Beverages");

// Add tag list to Hashtable for query searching values.
queryValue.Add("$Tag$", queryTagList);
try{
    ICacheReader queryResult = cache.ExecuteReader(query, queryValue, true);

    // queryResult contains all keys related to both tags.
    if (queryResult.FieldCount > 0){
        while (queryResult.Read()){
            //perform operations
        }
    }
    else{
        //no record exists
    }
}
catch (OperationFailedException ex){
    // handle exception
}