Method Insert

Insert(String, Object)

Inserts an item (object) into the cache.

Declaration
CacheItemVersion Insert(string key, object value)
Parameters
Type Name Description
System.String key

Unique key to identify the cache item.
System.Object value

The item (object) that is to be inserted into the cache.
Returns
Type Description
CacheItemVersion

Represents the version of each cache item.
Remarks

If the key already exists, this overload overwrites the values of the existing ICache item. If the key does not exist, it adds the item to the cache. If CacheItem contains invalid values, the related exception is thrown.

Examples

The following example demonstrates how to insert an item (object) into the cache.

Cache cache = NCache.InitializeCache("myCache");

Product product = new Product();
product.Id = 1;
product.Name = "Chai";

string key = "Product0";

cache.Insert(key,product);

Insert(String, CacheItem, WriteThruOptions, LockHandle, Boolean)

Inserts a CacheItem into the cache, allowing to specify the Write-Through option.

Declaration
CacheItemVersion Insert(string key, CacheItem item, WriteThruOptions writeThruOptions = null, LockHandle lockHandle = null, bool releaseLock = false)
Parameters
Type Name Description
System.String key

Unique key to identify the cache item.
CacheItem item

The CacheItem that is to be inserted into the cache.
WriteThruOptions writeThruOptions

WriteThruOptions regarding updating the data source. This can be either WriteThru, WriteBehind or None.
LockHandle lockHandle

An instance of LockHandle that holds the lock information. If the item is locked, then it can only be updated if the correct lockHandle is specified.
System.Boolean releaseLock

A flag to determine whether or not the lock should be released after operation is performed.
Returns
Type Description
CacheItemVersion

Represents the version of each cache item.
Remarks

If the key already exists, this overload overwrites the values of the existing ICache item. If the key does not exist, it adds the item to the cache. If CacheItem contains invalid values the related exception is thrown. Functionality of lockhandle with Readthru is not supported. See CacheItem for invalid property values and related exceptions.

Examples

Example demonstrates how to insert an item to the cache with a sliding expiration of 5 minutes, a priority of high, and that notifies the application when the item is removed from the cache.

ICache cache = CacheManager.GetCache("myCache");

Product product = new Product();
product.Id = 1;
product.Name = "Chai";

CacheItem item = new CacheItem(product);
item.Priority = CacheItemPriority.Low;

string key = "Product0";

cache.Add(key, item);

LockHandle lockHandle = new LockHandle();

CacheItem cachedItem = cache.Get<CacheItem>("cachedItemKey", true, new TimeSpan(0, 5, 0), ref lockHandle);

if (cachedItem != null)
{
    try
    {
       cachedItem.Priority = CacheItemPriority.High;
       cachedItem.Expiration = new Expiration(ExpirationType.Sliding, new TimeSpan(0, 2, 0));

       WriteThruOptions writeThruOptions = new WriteThruOptions(WriteMode.WriteThru, "ProdDataSource1");

       cache.Insert(key, cachedItem, writeThruOptions, lockHandle, true);
    }
    catch (OperationFailedException ex)
    {
    ...
    }
}