arthurh88
asked on
How do i create a simple array in a public class?
I have a string in a public class (class name is City). The string is called County, which may equal "King County" or "Lincoln County/Copiah County" (for example)....taken from Census data
It will never have more than 2 counties, either one or two.
So I need a simple string.split method.
In my class file I put:
Property County() as String
And in my VB code behind in my aspx page, I am unable to set County(0) = "some text" and County(1) = "more text", nor am I able to do a string.split on it. I get an error
So I tried using a list instead.
In my class file I put:
Property County As List(Of String)
And in my vb code I put:
City.County.Add("hello")
And i get a null reference error.
I'm not sure how to setup a basic array (that will hold a max of 2 values) in my public class and then set them in my aspx.vb page. Thanks for any help!
It will never have more than 2 counties, either one or two.
So I need a simple string.split method.
In my class file I put:
Property County() as String
And in my VB code behind in my aspx page, I am unable to set County(0) = "some text" and County(1) = "more text", nor am I able to do a string.split on it. I get an error
So I tried using a list instead.
In my class file I put:
Property County As List(Of String)
And in my vb code I put:
City.County.Add("hello")
And i get a null reference error.
I'm not sure how to setup a basic array (that will hold a max of 2 values) in my public class and then set them in my aspx.vb page. Thanks for any help!
ASKER
hi Huseyin, that didn't work. I don't want to set the variable "county". I want to set city.county
county(1) is not a declared variable in my vb file.
Trying to directly set city.county(1) doesn't work either, even though in my class file I have
Property County() As String '
basically I just want to
Simply create a class file with an array string county().
Then in my aspx form page i want to set the strings class.county(0) and class.county(1).
how do i do it?
county(1) is not a declared variable in my vb file.
Trying to directly set city.county(1) doesn't work either, even though in my class file I have
Property County() As String '
basically I just want to
Simply create a class file with an array string county().
Then in my aspx form page i want to set the strings class.county(0) and class.county(1).
how do i do it?
ASKER
i tried using
Property County() as array (in my class file)
but even still, I'm unable to set the array in my aspx form vb page:
city.county.add("hello") makes an error.
Property County() as array (in my class file)
but even still, I'm unable to set the array in my aspx form vb page:
city.county.add("hello") makes an error.
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ASKER
hah, clever. yes i like that. thanks!
Hi arthurh88;
Please see comments in the code block below.
Please see comments in the code block below.
' This line only creates a variable to hold an Array of String but does not allocate storage space
' So if you try to store values in it you will get Null Reference Exception
' Dim County() As String
' This will define a two element array with storage allocated
Dim County() As String = New String(1) {"", ""}
' Your code to define a List(Of String) has the same problem as above no space is allocated until you New it up.
' Try this way
Dim County2 As List(Of String) = New List(Of String)
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