Interaction.CallByName Method

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

Namespace: Microsoft.VisualBasic
Assembly: Microsoft.VisualBasic (in microsoft.visualbasic.dll)

public static Object CallByName (
	Object ObjectRef,
	string ProcName,
	CallType UseCallType,
	params Object[] Args
public static Object CallByName (
	Object ObjectRef, 
	String ProcName, 
	CallType UseCallType, 
	Object[] Args
public static function CallByName (
	ObjectRef : Object, 
	ProcName : String, 
	UseCallType : CallType, 
	... Args : Object[]
) : Object
Not applicable.



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


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


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


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

Return Value

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

For more detailed information, see the Visual Basic topic CallByName Function.

The CallByName function is used at runtime to get a property, set a property, or invoke a method.

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 statements must be at the top of a module.
Imports Microsoft.VisualBasic.CallType

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

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0