【英文】VB的过程

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Introduction

Notes on VB Process Learning

A process is a code segment that needs to be executed repeatedly and is the basic unit of a program.

Classification of Processes

  • General process: a user-defined process
  • Event process: a process that is executed when a system-provided event is triggered

Definition of General Processes

Definition of Sub Procedure

  • Definition of a procedure without a return value
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Modifier Sub ProcedureName(ParameterName As TypeIdentifier)
    ...
End Sub

Definition of Function Procedure

  • Definition of a procedure with a return value
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Modifier Function ProcedureName(ParameterName As TypeIdentifier) As ReturnType
    ...
    ProcedureName = ReturnValue
End Function

Definition of Property Procedure

  • Definition of a property procedure
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Modifier Property ProcedureName(ParameterName As TypeIdentifier) As ReturnType
    ...
End Property

Definition of Event Procedure

  • Definition of an event procedure
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Modifier Event ProcedureName(ParameterName As TypeIdentifier) As ReturnType
    ...
End Event

Scope of Processes

Public

  • Can be used in all modules of the project
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Public Sub ProcedureName(ParameterName As TypeIdentifier)
    ...
End Sub

Private

  • Can only be used in the current module
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Private Sub ProcedureName(ParameterName As TypeIdentifier)
    ...
End Sub

Static

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Modifier Static Sub ProcedureName(ParameterName As TypeIdentifier)
    ...
End Sub

Passing Parameters by Value and by Reference

Passing by Reference (Default)

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Modifier Sub ProcedureName(ByRef ParameterName As TypeIdentifier)
    ...
End Sub

Passing by Value

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Modifier Sub ProcedureName(ByVal ParameterName As TypeIdentifier)
    ...
End Sub

Calling a Procedure

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' If there are no arguments, parentheses can be omitted
ProcedureName
Call ProcedureName

' If there are arguments, a parameter list needs to be passed
ProcedureName Argument
Call ProcedureName(Argument)

' When called in this way, arguments are treated as expressions
ProcedureName(Argument)

Immediately Terminating a Procedure

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Exit ProcedureType

Conclusion

References

Bilibili - Jiao Da You