Hastbale

Swapnil Mache

what is use of hast table?? can we use directory in .net framework 3.5?? what is exactly key - value pair?? plz give detail explanation..

7 Replies

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Sujeet Suman11y ago
We should prefer Dictionary over Hashtable. Because Dictionary is a generic type, Hashtable is not. That means you get type safety with Dictionary, because you can't insert any random object into it, and you don't have to cast the values you take out.
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Raja T11y ago
yes you can use most prefer to Dictionary.

http://www.dotnetperls.com/dictionary
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Rajeesh Menoth11y ago
Hi,

Ref the following

1) http://www.c-sharpcorner.com/UploadFile/e83792/C-Sharp-nethash-table-class/

2) http://www.c-sharpcorner.com/UploadFile/mahesh/Hashtable11082005171748PM/Hashtable.aspx
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Swapnil Mache11y ago
can i use dictionary instead of hash table???
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Swapnil Mache11y ago
thank you...:)
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Raja T11y ago
Hi, yes you can use and key-value pair is similar or just like to query string concept but not querystring.

Dictionary is a generic type, allowing:
static typing (and compile-time verification)
use without boxing
If you are .NET 2.0 or above, you should prefer Dictionary (and the other generic collections)

Hashtable is also collection which takes a key corresponding to each values.
If you want to find something in a hashtable you dont have to go through each value in hashtable, instead search for key values and is faster.

Checkout below urls

http://stackoverflow.com/questions/876656/difference-between-dictionary-and-hashtable
http://www.codeproject.com/Tips/602537/Hashtable-vs-Dictionary

http://www.c-sharpcorner.com/forums/thread/194369/hash-table-and-dictionary-in-C-Sharp.aspx
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Munesh Sharma11y ago
Hashtable represents a collection of key/value pairs which maps keys to value. Any non-null object can be used as a key but a value can. We can retrieve items from hashTable to provide the key . Both keys and values are Objects.
Hashtable ht = new Hashtable();
ht.Add("1", "Sunday");
ht.Add("2", "Monday");
if you want to check data
ht.Contains("1")
The above code return true if item exist else false.
for more go on this link
http://csharp.net-informations.com/collection/csharp-hashtable.htm
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