enerally, when a good programmer has to design a type (or a hierarchy of types), he does an analysis of the problem and then starts to write properties and methods that describe the type behavior. If a method requires long processing time, it is the perfect candidate for being called
‘ Return the array of IP addresses for the local host’ Note: Requires Imports System.Net’ Example:’ Dim ipa As IPAddress’ For Each ipa In GetLocalHostIpAddresses()’ Debug.WriteLine(ipa.ToString())’ NextFunction GetLocalHostIpAddresses() As IPAddress() Dim iphe As IPHostEntry = Dns.GetHostByName(Dns.GetHostName()) Return iphe.AddressList()End Function
‘ Serialize an object to file in binary format’ It can handle types that the SOAP serialization can’t’ Requires:’ Imports System.IO’ Imports System.Runtime.Serialization.Formatters.BinaryPrivate Sub SaveBinaryData(ByVal path As String, ByVal o As Object) ‘ Open a file stream for output. Dim fs As FileStream = New FileStream(path, FileMode.Create) ‘ Create a
‘ Return the OleDbType that represents the specified system type’ This is particularly useful when you have a DataTable and want to create a ‘ OleDbParameter for onw of its columns, but don’t know its type. ‘ DataColumnName.DataType returns a Type, and you can convert it to OleDbType ‘ by
‘ Deserialize an object from a file in binary format’ It can handle types that the SOAP serialization can’t’ Requires:’ Imports System.IO’ Imports System.Runtime.Serialization.Formatters.BinaryPrivate Function LoadBinaryData(ByVal path As String) As Object ‘ Open a file stream for input Dim fs As FileStream = New FileStream(path, FileMode.Open) ‘ Create a binary
‘ Return the HTML code for the specified Color’ Example: MessageBox.Show(Color2Html(Color.Red)) ==> #ff0000Function Color2Html(ByVal clr As Color) As String Return “#” & clr.ToArgb().ToString(“x”).Substring(2)End Function
Printing con be quite difficult in VB.NET (or any other .NET language), especially if you not only have to print plain text, but also tables, images, bulleted lists, text with different fonts, styles, colors and any other type of formatted data. Here’s a tip that can make your life much