BitSharper.Store.DiskBlockStore.GetChainHead C# (CSharp) Method

        public StoredBlock GetChainHead()
        {
            lock (this)
            {
                StoredBlock block;
                _blockMap.TryGetValue(_chainHead, out block);
                return block;
            }
        }

 public void TestStorage()
 {
     var temp = new FileInfo(Path.GetTempFileName());
     try
     {
         Console.WriteLine(temp.FullName);
         var @params = NetworkParameters.UnitTests();
         var to = new EcKey().ToAddress(@params);
         StoredBlock b1;
         using (var store = new DiskBlockStore(@params, temp))
         {
             // Check the first block in a new store is the genesis block.
             var genesis = store.GetChainHead();
             Assert.AreEqual(@params.GenesisBlock, genesis.Header);
             // Build a new block.
             b1 = genesis.Build(genesis.Header.CreateNextBlock(to).CloneAsHeader());
             store.Put(b1);
             store.SetChainHead(b1);
         }
         // Check we can get it back out again if we rebuild the store object.
         using (var store = new DiskBlockStore(@params, temp))
         {
             var b2 = store.Get(b1.Header.Hash);
             Assert.AreEqual(b1, b2);
             // Check the chain head was stored correctly also.
             Assert.AreEqual(b1, store.GetChainHead());
         }
     }
     finally
     {
         temp.Delete();
     }
 }