Classes - Page 3

Return a case-insensitive hashtable containing all the members in a type Note: requires Imports System.Reflection Example: Dim ht As Hashtable = GetAllMembers(GetType(String), False) For Each key As Object In ht.Keys Dim member As MemberInfo = DirectCast(ht(key), MemberInfo) Debug.

Load an assembly identified by the path or the partial name Note: requires Imports System.Reflection Examples: 1) Dim asm As [Assembly] = LoadAssembly("System.Web") 2) Dim asm As [Assembly] = LoadAssembly("C:\MyApp\MyAssembly.dll")

If you use VS.NET you know that there are a number of classes that offer visual design-time support, i.e. they can be dragged and dropped on your form, and their properties can be set through the Properties Window. This saves you from writing the instance declaration and the code to set the ...

Return True if all the controls in the input array have the same value for the specified property Note: requires the GetField function Example: Debug.WriteLine(HaveSameValue("Text", TextBox1, Button1, Button2)) Debug.WriteLine(HaveSameValue("ForeColor", Button1, Button2)) Button1.ForeColor ...

Set a property of multiple controls/objects in a single step, and return True if successful Note: requires the SetProperty function Example: SetPropertyEx("Text", "OK!!!", TextBox1, Button1, Button2)

Add or remove an event handler through reflection, and return True if successful Examples: add an event handler for Button1's Click event AddRemoveEventHandler(Button1, "Click", New EventHandler(AddressOf OnButton1Click)) remove an event handler for Button1's Click event AddR

Return the value of the public field with the specified name, defined inside the obj object Note: requires Imports System.Reflection Example: Public TestField As String = "hello" ... MessageBox.Show(GetField(Me, "TestField", ""))

Read a property via reflection or return a default value Example: MessageBox.Show(GetProperty(Button1, "Text", ""))

Invoke a method via reflection and return its result - return null if method doesn't exist or throws Note: requires Imports System.Reflection Example: Function GetCompleteName(ByVal firstName As String, ByVal lastName As String) Return lastName & ", " & firstName End Function ... MessageBox.

Check whether an object supports a member with the specified name Examples: Debug.WriteLine(IsMemberSupported(Button1, "BackColor")) ' => True Debug.WriteLine(IsMemberSupported(Button1, "Focus")) ' => True Debug.WriteLine(IsMemberSupported(Button1, "TextColor")) ' => False Debug.

Set a property via reflection and return True if successful Example: SetProperty(Button1, "Text", "Click me")

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.Binary

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.Binary

In software design, you should plan ahead the interface of a class hierarchy to make sure that all related concrete classes share a common interface. This can be achieved by using abstract ...

Here it is some code that shows how to use reflection to dynamically set an event handler for a class' event. Sub TestSub() ' create a Person Dim pe As New Person() ' get a reference to the EventInfo for this object Dim peEv As EventInfo = pe.GetType.