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This article mainly introduces how to use the String data type in VB.NET. It is very detailed and has a certain reference value. Friends who are interested must finish it!

If a variable always stores a string such as "I am Chinese" and does not contain a value such as 3.1415926, it can be declared as a String type.

In VB.NET, a string can contain approximately 200 million (2 to 31 power) Unicode characters with internal codes ranging from 0 to 65535. The first 128characters represent English letters and characters on a standard keyboard, and 128to255characters represent special characters, such as Latin letters, currency symbols, fractions, etc.

Declare the format of the string variable:

Dim S As String

You can then assign a string value to the variable and manipulate it with a string function, such as:

S = "I am Chinese"

By default, a variable of type String or its argument is a variable-length string whose length can increase or decrease as new data is assigned to the string.

Basic functions that can operate on VB.NET String data types:

1.Len function

This function returns the length of the string, the return value is long integer (Long), and its syntax is:

Len (string | varname)

Description: the VB.NET String data type is any valid string expression; varname is any valid and variable name. If varname is an Object,Len function that treats it as String and always returns the number of characters it contains, such as:

Dim An as String Dim B as Integer A = "I am Chinese" 'initialization string B=Len (A)' returns 10 (a Chinese character occupies 2 bytes)

2.Trim, Ltrim and Rtrim functions

The Trim, Ltrim, and Rtrim functions complete the removal of some or all of the spaces in the string. Trim removes all spaces in the string, Ltrim removes the starting spaces in the string, and Rtrim removes all the spaces at the end of the string, for example:

Dim An As String B As String A = "hello" 'initialization string B=Trim (A)' B = "hello" B=Ltrim (B)'B = "hello" B=Rtrim (B)'B = "hello"

3.Substring method:

The Substring method replaces the standard functions such as "Right", "Left" and "Mid" in vb 6.0. the usage is:

StrName.Substring (startChar,Length)

For example:

S.Substring (0jue 2)'is equivalent to Left (SMagol 2) S.Substring (S.Length (),-4)'is equivalent to Right (SMagne 4). These are all the contents of this article entitled "how to use String data types in VB.NET". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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