vba中dim和set有什么区别

Question

Pardon me as am a newbie in VBA.

Sometimes I use

Dim r as Range
r = Range("A1")

Other times I use

Set r = Range("A1")

What is the difference? And when should I use what?

Answer 1

There's no reason to use set unless referring to an object reference. It's good practice to only use it in that context. For all other simple data types, just use an assignment operator. It's a good idea to dim (dimension) ALL variables however:

Examples of simple data types would be integer , long , boolean , string . These are just data types and do not have their own methods and properties.

Dim i as Integer
i = 5

Dim myWord as String
myWord = "Whatever I want"

An example of an object would be a Range , a Worksheet , or a Workbook . These have their own methods and properties.

Dim myRange as Range
Set myRange = Sheet1.Range("A1")

If you try to use the last line without Set , VB will throw an error. Now that you have an object declared you can access its properties and methods.

myString = myRange.Value

Answer 2

• Dim declares the variable .

   Dim r As Range

• Set sets the variable to an object reference .

   Set r = Range("A1")

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However, I don't think this is what you're really asking.

Sometimes I use:

 Dim r as Range r = Range("A1")

This will never work. Without Set you will receive runtime error #91 Object variable or With block variable not set . This is because you must use Set to assign a variables value to an object reference. Then the code above will work.

I think the code below illustrates what you're really asking about. Let's suppose we don't declare a type and let r be a Variant type instead.

Public Sub test()
    Dim r
    debug.print TypeName(r)

    Set r = Range("A1")
    debug.print TypeName(r)

    r = Range("A1")
    debug.print TypeName(r)
End Sub

So, let's break down what happens here.

1. r is declared as a Variant

    `Dim r` ' TypeName(r) returns "Empty", which is the value for an uninitialized variant

2. r is set to the Range containing cell "A1"

    Set r = Range("A1") ' TypeName(r) returns "Range"

3. r is set to the value of the default property of Range("A1") .

    r = Range("A1") ' TypeName(r) returns "String"

In this case, the default property of a Range is .Value , so the following two lines of code are equivalent.

r = Range("A1")
r = Range("A1").Value

For more about default object properties, please see Chip Pearson's "Default Member of a Class" .

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As for your Set example:

Other times I use

Set r = Range("A1")

This wouldn't work without first declaring that r is a Range or Variant object... using the Dim statement - unless you don't have Option Explicit enabled, which you should. Always. Otherwise, you're using identifiers that you haven't declared and they are all implicitly declared as Variants .

Answer 3

Dim: you are defining a variable (here: r is a variable of type Range)

Set: you are setting the property (here: set the value of r to Range("A1") - this is not a type, but a value).

You have to use set with objects, if r were a simple type (eg int, string), then you would just write:

Dim r As Integer
r=5

Answer 4

Dim simply declares the value and the type.

Set assigns a value to the variable.

Answer 5

如果将变量定义为对象，例如 Dim myfldr As Folder，则使用关键字“Set”为其分配值。

Answer 6

Dim is short for Dimension and is used in VBA and VB6 to declare local variables.

Set on the other hand, has nothing to do with variable declarations. The Set keyword is used to assign an object variable to a new object.

Hope that clarifies the difference for you.

Answer 7

According to VBA help on SET statement it sets a reference to an object.so if you change a property the actual object will also changes.

Dim newObj as Object
Set var1=Object1(same type as Object)
Set var2=Object1(same type as Object)
Set var3=Object1(same type as Object)
Set var4=Object1(same type as Object)
Var1.property1=NewPropertyValue

the other Vars properties also changes,so:

Var1.property1=Var2.property1=Var3.property1=Var4.property1=Object1.Property1=NewpropertyValue`

actualy all vars are the same!