Hello experts,
I recently deployed a project that uses
a struct and is declared like this:
struct TableFields
{
public string BadgeNumber;
public string SSN;
public string Name;
}
I have 4 methods that use this structure
as a reference parameter. And these are:
InsertRecord(ref TableFields stf)
UpdateRecord(ref TableFields stf)
getRecord(string ABadgeNumber, ref TableFields stf)
getRecordEx(string ASSN, ref TableFields stf)
The structure as well as the 4 methods are in a
file called 'DatabaseManager'. The struct is
declared outside the class.
My MainForm.cs file uses the methods defined in the
DatabaseManager.cs file.
I have a btnSave_Click() event that uses the structure
to temporarily store the contents of the textboxes like
so:
TableFields tblUser; // notice that no instantiation took place.
tblUser.BadgeNumber = SearchbADGENUMBERTextBox.Text;
tblUser.SSN = sSNTextBox.Text.ToUpper();
tblUser.Name = nAMETextBox.Text;
... // validation / search for record if exists go here...
dm.InsertRecord(tblUser);
Now, here's what my validation code looks like:
TableFields field = new TableFields(); // compile error when
"new ..." is removed.
if (dm.getRecord(SearchbADGENUMBERTextBox.Text.Trim(), field))
{
MessageBox.Show("Record with BadgeNumber " +
SearchbADGENUMBERTextBox.Text + " already exists.",
"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
...
}
The compiler error I get is:
"Use of unassigned local variable 'field'"
I just don't understand why at some point, the structure
needs to be initialized prior to using it. Whereas, I was able
to use the structure when I want to get the textbox.Text
values. My assumption is that dm.getRecord might return null
(since there's a sql call underneath it) and this might
affect some of the structure's fields. Am I correct?
Can someone enlighten me on this one? Thank you
in advance.
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