Visual Basic Lists

Submitted by: 
Language: 
Visitors have accessed this post 984 times.

In Visual Basic, lists are very similar to Arrays. A list contains a group of separate data all contained in one place. The type of data that can be stored within a list can be any type of variant. However, only one type can be contained within one list.

Creating a new List

Step 1:

Dim

Dim is the keyword inside Visual Basic which creates a new instance of a variable.

Step 2:

Dim ourList

Following the keyword Dim we have the variable name of our new list which can be changed accordingly and is used to reference to the list later on in our project.

Step 3:

Dim ourList As New List

Here we are setting the variable type of ourList to a new instance of a list.

Step 4:

Dim ourList As New List(Of String)

Finally, we have already set the type of our variable in Step 3 so here we are setting the type of variable go within our new List.
In summary, we have a new variable called ourList which is set equal to a new list of strings.

Adding and Clearing a List

Once we have created our list we can simply add items to it by simply using the Add function. Because we set our type of our list to a string, the add function will only accept a string type:

ourList.Add("Item To Add")

If we require to empty our list of all entered values, we can use the clear function:

ourList.Clear()

Getting or Setting a variable within a List

We can write a simple line of code to give us the value of a part of a list and output it in a simple messagebox, like so:

MsgBox(ourList(1))

This code would create a msgbox with the message set to the value of ourList(1). This will return the value which we have added second to our List. Why Second? Because the List begins counting at 0, so 1 is actually 2.

To set a new value to a variable within our list we can use the assignment operator:

ourList(1) = "Hello World!"


Add new comment

Filtered HTML

  • Web page addresses and e-mail addresses turn into links automatically.
  • You may insert videos with [video:URL]
  • Allowed HTML tags: <a> <em> <strong> <cite> <blockquote> <code> <ul> <ol> <li> <dl> <dt> <dd> <table> <tr> <td> <th> <img> <h1> <h2> <h3> <iframe> [video]
  • You can enable syntax highlighting of source code with the following tags: <code>, <blockcode>, <asp>, <c>, <cpp>, <csharp>, <css>, <html4strict>, <java>, <javascript>, <mysql>, <php>, <python>, <sql>, <vb>, <vbnet>. The supported tag styles are: <foo>, [foo].
  • Lines and paragraphs break automatically.

Plain text

  • No HTML tags allowed.
  • Lines and paragraphs break automatically.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.