Tuple Assignment in Vb.Net

To initialize and assign tuples in a single line, use the following syntax. However, make sure to instantiate and assign values to commas before direct assignment above. Alternatively, you can use the below example to avoid using Item1, Item2, etc.

Question:

Is it possible to assign a tuple in VB? If yes, what is the syntax for it?

Private Function GetPeStream(metadataDiagnostics As DiagnosticBag, peStreamProvider As EmitStreamProvider, metadataOnly As Boolean) As (peStream As Stream, signingStream As Stream, selectedStream As Stream)
    Return ...
End Function
Dim ret As Stream
Dim peStream as Stream
Dim signingInputStream as Stream
(peStream, signingInputStream, ret) = GetPeStream(metadataDiagnostics, peStreamProvider, metadataOnly)


Solution 1:


The initialization and assignment of tuples in a single line can be done using the following syntax.

Dim x As Tuple(Of Stream, Stream, Stream)= New Tuple(of Stream,Stream,Stream)(str1,str2,str3)

Ensure that before directly assigning values, the instantiation and assignment of the following codes:

str1

,

str2

, and

str3

, have been completed. It is crucial to have these codes assigned values beforehand.


Solution 2:


The utilization of Item1, Item2, and so on can be circumvented by following the given example.

Private Function GetPeStream(metadataDiagnostics As DiagnosticBag, peStreamProvider As EmitStreamProvider, metadataOnly As Boolean) As (peStream As Stream, signingStream As Stream, selectedStream As Stream)
    
    .....
    Return (processed_peStream, processed_signingStream,processed_selectedStream)
End Function
Private Function ConsumingGetPeStream()...
    'Calling the function
    Dim Your_Result_From_GetPeStream = GetPeStream(metadataDiagnostics_value, peStreamProvider_value, metadataOnly_Value)
    
    'Using returned values from function    
    Your_Result_From_GetPeStream.peStream
    Your_Result_From_GetPeStream.signingStream
    Your_Result_From_GetPeStream.selectedStream
    
End Function

A simplified version for enhanced comprehension.

      Public Sub Main()
                Dim ReturnFunctionWithTuple = FunctionWithTuple()
                Console.WriteLine($"Your long: {ReturnFunctionWithTuple.YourFieldLong}")
                Console.WriteLine($"Your date: {ReturnFunctionWithTuple.YourFieldDate}")
                Console.WriteLine($"Your bool: {ReturnFunctionWithTuple.YourFiedBoolean}")
            End Sub
            Public Function FunctionWithTuple() As (YourFieldLong As Long, YourFieldDate As Date, YourFiedBoolean As Boolean)
                Return (55, #01/01/2021#, False)
            End Function


Solution 3:

Create the function
return type
and the tuple variable utilizing the generic syntax to ensure that their types are aligned. As an illustration:

Public Sub GetTuple()
    Dim x As Tuple(Of String, String, Integer)
    x = GetData()
End Sub
Public Function GetData() As Tuple(Of String, String, Integer)
    Dim y = New Tuple(Of String, String, Integer)("A", "B", 27)
    Return y
End Function


Solution 4:

To accomplish this task, it is necessary to generate a fresh Tuple that allows the assignment, as instructed by PKing, and subsequently duplicate each variable individually through manual means.

Dim x As Tuple(Of Stream, Stream, Stream)
x = GetData()
Dim eStream  as Stream = x.Item1
Dim signingInputStream as Stream = x.Item2
Dim Ret as Stream = x.Item3

Naturally, the tasks will be repetitive and include programming instructions related to the categories.

Frequently Asked Questions

Posted in Uncategorized