Lỗi object variable or with block variable not set năm 2024

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Object variable or With block variable not set

• Article
• 09/15/2021

In this article

An invalid object variable is being referenced. This error can occur for several reasons:

• A variable was declared without specifying a type. If a variable is declared without specifying a type, it defaults to type Object. For example, a variable declared with Dim x would be of type Object; a variable declared with Dim x As String would be of type String. Tip The Option Strict statement disallows implicit typing that results in an Object type. If you omit the type, a compile-time error will occur. See Option Strict Statement.
• You are attempting to reference an object that has been set to Nothing.
• You are attempting to access an element of an array variable that wasn't properly declared. For example, an array declared as products[] As String will trigger the error if you try to reference an element of the array `Object`0. The array has no elements and is treated as an object.
• You are attempting to access code within a `Object`1 block before the block has been initialized. A `Object`1 block must be initialized by executing the `Object`3 statement entry point.

Note

In earlier versions of Visual Basic or VBA, this error was also triggered by assigning a value to a variable without using the `Object`4 keyword [`Object`5 instead of `Object`6]. The `Object`4 keyword is no longer valid in Visual Basic .Net.

To correct this error

1. Set Option Strict to Object`9 by adding the following code to the beginning of the file:

   Option Strict On

   ` When you run the project, a compiler error will appear in the Error List for any variable that was specified without a type.
2. If you don't want to enable Option Strict, search your code for any variables that were specified without a type [Dim x instead of Dim x As String] and add the intended type to the declaration.
3. Make sure you aren't referring to an object variable that has been set to Nothing. Search your code for the keyword Nothing, and revise your code so that the object isn't set to Nothing until after you have referenced it.
4. Make sure that any array variables are dimensioned before you access them. You can either assign a dimension when you first create the array [`Dim x`6 instead of `Dim x`7], or use the `Dim x`8 keyword to set the dimensions of the array before you first access it.
5. Make sure your `Object`3 block is initialized by executing the `Object`3 statement entry point.

See also

• Object Variable Declaration
• ReDim Statement
• With...End With Statement

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