Executes a method on an object, or sets or returns a property on an object.

Public Function CallByName( _
   ByVal Object As System.Object, _
   ByVal ProcName As String, _
   ByVal UseCallType As CallType, _
   ByVal ParamArrayArgs() As Object _
) As Object

Parameters

Object

Required. Object. A pointer to the object exposing the property or method.

ProcName

Required. String. A string expression containing the name of the property or method on the object.

UseCallType

Required. An enumeration member of type Microsoft.VisualBasic.CallType representing the type of procedure being called. The value of CallType can be Method, Get, or Set.

ParamArrayArgs()

Optional. ParamArray. A parameter array containing the arguments to be passed to the property or method being called.

Exceptions/Errors

Remarks

The CallByName function is used to get or set a property, or to invoke a method, at run time, using a string to specify the name of the property or method.

Example

In the following example, the first line uses CallByName to set the Text property of a text box, the second line retrieves the value of the Text property, and the third line invokes the Move method to move the text box.

Imports Microsoft.VisualBasic.CallType
' Imports statements must be at the top of a module.
...
Sub TestCallByName1()
'  Set a property.
   CallByName(TextBox1, "Text", CallType.Set, "New Text")
'  Retrieve the value of a property.
   MsgBox(CallByName(TextBox1, "Text", CallType.Get))
'  Call a method.
   CallByName(TextBox1, "Hide", CallType.Method)
End Sub

The next example uses the CallByName function to invoke the Add and Item methods of a collection object.

Public Sub TestCallByName2()
   Dim col As New Collection()
'  Store the string "Item One" in a collection by 
'  calling the Add method.
   CallByName(col, "Add", CallType.Method, "Item One")
'  Retrieve the first entry from the collection using the 
'  Item property and display it using MsgBox().
   MsgBox(CallByName(col, "Item", CallType.Get, 1))
End Sub

See Also

CallType Enumeration | Parameter Arrays | Calling a Property or Method Using a String Name| ArgumentException