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Operator '=' is not defined for type 'DBNull' and type 'Integer'
I am migrating vb6 project to vb.net. there are variant type arrays that I migrated as object types.
having this code line I get the error: Operator '=' is not defined for type 'DBNull' and type 'Integer'
If arrY(13, X) = gloT And (CBool(arrY(18, X)) = True Or (CBool(arrY(18, X)) = False And arr(65, X) = 100)) Then
arr(65, X) has a null value . If I cannt initialize it to 0 how can I avoid the exception?
having this code line I get the error: Operator '=' is not defined for type 'DBNull' and type 'Integer'
If arrY(13, X) = gloT And (CBool(arrY(18, X)) = True Or (CBool(arrY(18, X)) = False And arr(65, X) = 100)) Then
arr(65, X) has a null value . If I cannt initialize it to 0 how can I avoid the exception?
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To be honest, it would be best practise try to avoid using Object when migrating to VB.Net and you should always initialise arrays before using them, as you cannot guarantee what is in the values before using them.
e.g.
Dim arr(100,100) as Integer
Dim r as integer, c as integer
For r=1 to 100
For c=1 to 100
arr(r,c)=0
Next c
Next r
Alternatively, you could modify the values in the condition:
f arrY(13, X) = gloT And (CBool(arrY(18, X)) = True Or (CBool(arrY(18, X)) = False And (arr(65, X) + 0) = 100)) Then
e.g.
Dim arr(100,100) as Integer
Dim r as integer, c as integer
For r=1 to 100
For c=1 to 100
arr(r,c)=0
Next c
Next r
Alternatively, you could modify the values in the condition:
f arrY(13, X) = gloT And (CBool(arrY(18, X)) = True Or (CBool(arrY(18, X)) = False And (arr(65, X) + 0) = 100)) Then
Thank you, I initialize the array but the vb6 code is using the null value after the initialize to 0. I assume there is a significance to that. I tried to use +0 method you mentioned but still getting the error: Operator '+' is not defined for type 'DBNull' and type 'Integer'
How do you set up the values from the array, do you read them from a database or a file.
I find that, you should read values as strings (add a empty string to covert from Null to a value) and then try to convert to a integer value (using VAL or CInt or whatever) before assigning to the array.
I find that, you should read values as strings (add a empty string to covert from Null to a value) and then try to convert to a integer value (using VAL or CInt or whatever) before assigning to the array.
Hi Hagar;
The DbNull is the a non existent value used in databases for not having a value. When you attempt to use a variable that may contain a DbNull you need to test to see if the variable has a valid value first. Something like the following can be used.
The DbNull is the a non existent value used in databases for not having a value. When you attempt to use a variable that may contain a DbNull you need to test to see if the variable has a valid value first. Something like the following can be used.
Dim arr65 = If( DBNull.Value.Equals(arr(65, X)), 0, arr(65, X))
If arrY(13, X) = gloT And (CBool(arrY(18, X)) = True Or (CBool(arrY(18, X)) = False And arr65 = 100)) Then
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