April 2002
Intermediate to advanced
688 pages
19h 51m
English
Content preview from VB.NET Language in a Nutshell, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Name
Hashtable.Add Method
Class
System.Collections.Hashtable
Syntax
hashtablevariable.Add(Key,Value)
-
Key(required; Object) The hash table entry’s key
-
Value(required; Object) The hash table entry’s value
Return Value
None
Description
Adds a key/value pair to the hash table
Rules at a Glance
Keymust be unique or a runtime error occurs.Keys are immutable. Once added, a particular key value cannot be changed during the lifetime of the hash table except by removing it through the Remove or Clear method and then adding it once again.
Valueneed not be unique.
Programming Tips and Gotchas
According to the documentation, it is better to build a key from a
Stringobject than the Base Class Library’sStringBuilderobject.The Item property can also be used to add new members to the hash table.
To ensure that key is unique when calling the Add method, you can call the ContainsKey method beforehand.
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.