Question

I am converting a VB.NET project to C# and I got stuck on this if-loop, could anyone help me convert this? I am assuming that i’ll need to use the GetType()-method for this but I’m not sure how.

The Loop:

Private Sub oOpcGroup_DataChange(ByVal TransactionID As Integer, ByVal NumItems As Integer, ByRef ClientHandles() As Integer, ByRef ItemValues() As Object, ByRef Qualities() As Integer, ByRef TimeStamps() As Date)

    Dim i As Integer

    For i = 1 To NumItems
        If VarType(ItemValues(i)) And Not VariantType.Array Then
            txtSubValue.Text = ItemValues(i)
        Else
            MsgBox("Data type return error, returned array, expected single item", MsgBoxStyle.Critical, "Data Change Error")
            Exit Sub
        End If
    Next i
    Exit Sub
End Sub

This is what I have so far:

void oOpcGroup_DataChange(int TransactionID, int NumItems, ref Array ClientHandles, ref Array ItemValues, ref Array Qualities, ref Array TimeStamps)    //Events OPCGroup
    {

        for (int i = 0; i < NumItems; i++)
        {
            if(){

            }
            else
            {
                MessageBox.Show("Expected single item.", "Data type return error.", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            }
        }

    }

Answer 1

Here is what I came up with, using the GetType() instead of the Information.VarType.

I did replace the MsgBox method call with a call to System.Windows.Forms.MessageBox.Show.

private void oOpcGroup_DataChange(int TransactionID, int NumItems, ref Array ClientHandles, ref Array ItemValues, ref Array Qualities, ref Array TimeStamps)  
{

    for (int i = 0; i < NumItems; i++)
    {
        var obj = ItemValues.GetValue(i);

        if (obj != null && !obj.GetType().IsArray)
        {
            txtSubValue.Text = obj.ToString();
        }
        else
        {
            System.Windows.Forms.MessageBox.Show("Data type return error, returned array, expected single item", "Data Change Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }
}