What is the difference between Hashtable and Dictionary C#?

What is the difference between Hashtable and Dictionary C#?

Hashtable Vs Dictionary A Hashtable is a non-generic collection. In Dictionary, you can store key/value pairs of same type. In Hashtable, there is no need to specify the type of the key and value. In Dictionary, you must specify the type of key and value.

Should I use Dictionary or Hashtable in C#?

A Dictionary of a specific type (other than Object) has better performance than a Hashtable for value types because the elements of Hashtable are of type Object and, therefore, boxing and unboxing typically occur if storing or retrieving a value type. Another important difference is that Hashtable is thread safe.

Is Hashtable better than Dictionary?

Dictionary is a generic type and returns an error if you try to find a key which is not there. The Dictionary collection is faster than Hashtable because there is no boxing and unboxing.

Is a Hashtable the same as a Dictionary?

A dictionary is a data structure that maps keys to values. A hash table is a data structure that maps keys to values by taking the hash value of the key (by applying some hash function to it) and mapping that to a bucket where one or more values are stored.

Can Hashtable have duplicate keys in C#?

In hashtable, you can store elements of the same type and of the different types. The elements of hashtable that is a key/value pair are stored in DictionaryEntry, so you can also cast the key/value pairs to a DictionaryEntry. In Hashtable, key must be unique. Duplicate keys are not allowed.

Is Dictionary type safe C#?

The main difference is both belong to different classes and Hashtable doesn’t care about the datatype, it can contain key and value of any data type, because it doesn’t provide type safety but on the other hand dictionary provides type safety and it can contain data of data type , which is declared at the time of its …

Which is better List or Dictionary in C#?

The larger the list, the longer it takes. Of course the Dictionary in principle has a faster lookup with O(1) while the lookup performance of a List is an O(n) operation. The Dictionary map a key to a value and cannot have duplicate keys, whereas a list just contains a collection of values.

Why do we use Hashtable in C#?

The Hashtable class represents a collection of key-and-value pairs that are organized based on the hash code of the key. A hash table is used when you need to access elements by using key, and you can identify a useful key value. Each item in the hash table has a key/value pair.

What is the difference between Dictionary and list in C#?

Dictionary is a collection of keys and values in C#. Dictionary is a generic type and returns an error if you try to find a key which is not there. List collection is a generic class and can store any data types to create a list.

Is dictionary values thread-safe?

All public and protected members of ConcurrentDictionaryTValue> are thread-safe and may be used concurrently from multiple threads. Since the dictionary is mutated by multiple threads, the size can increase (or decrease) after Count is invoked but before CopyTo is.