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VB .Net Functions and Statements

Tham khảo tài liệu 'vb .net functions and statements', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Bonus Reference VB.NET Functions and Statements This BONUS REFERENCE DESCRIBES the functions and statements that are supported by Visual Basic .NET grouped by category. When you re searching for the statement to open a file you probably want to locate all file I O commands in one place. This is exactly how this reference is organized. Moreover by grouping all related functions and statements in one place I can present examples that combine more than one function or statement. The majority of the functions are the same as in VB6. One difference is that many of the VB6 statements are implemented as functions in VB.NET. Moreover many VB6 functions have an equivalent method in a Framework class. VB programmers are so accustomed to the old functions that they will not consider the alternatives at least for a while. The Len function of VB6 returns the length of a string. In VB.NET you can retrieve the length of a string with the Length method of a string variable. If strVar is declared as string variable you can retrieve its length by calling the Length method Dim strVar As String a short string Console.WriteLine The string contains strVar.Length characters Or you can call the Len function passing the name of the string as argument Dim strVar As String a short string Console.WriteLine The string contains Len strVar characters Most of the built-in functions are VB6 functions and they accept optional arguments. VB.NET uses overloaded forms of the same function and this is an important difference you have to keep in mind as you work with the built-in functions. If you omit an optional argument you must still insert the comma to indicate that an argument is missing. Optional arguments are enclosed in square brackets. The Mid function for example extracts a number of characters from a string and its syntax is newString Mid string start length The starting location of the characters to be extracted is specified by the start argument and the number of characters to be extracted