public MyLinkedListItem <T> FindItem(ulong itemNumber, MyLinkListSearchDirection direction)
{
MyLinkedListItem <T> retItem = null;
switch (direction)
{
case MyLinkListSearchDirection.Ascending:
retItem = FindItemAscending(itemNumber);
break;
case MyLinkListSearchDirection.Descending:
retItem = FindItemDescending(itemNumber);
break;
}
return(retItem);
}
private void btnSearch_Click(object sender, EventArgs e)
{
ulong itemNumber = 0;
if (!ulong.TryParse(txtItemNumber.Text, out itemNumber))
{
MessageBox.Show("Please enter a valid non-negative number into the Item Number field.", "Data Entry Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
txtItemNumber.Focus();
txtItemNumber.SelectAll();
return;
}
MyLinkListSearchDirection searchType = (cmbSearchType.Text == "ASC") ? MyLinkListSearchDirection.Ascending : MyLinkListSearchDirection.Descending;
string searchDataResult = "Unable to find entry. Item Number is out of range.";
if (bIntegerOrString)
{
if (IntegerLinkedList.IsEmpty)
{
MessageBox.Show("Please load a file with integer data.", "Integer Data Empty", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
MyLinkedListItem <long> item = IntegerLinkedList.FindItem(itemNumber, searchType);
if (item != null)
{
searchDataResult = string.Format("Integer data found at position {0} from {1} of linked list.{2}Value: {3}", itemNumber,
(searchType == MyLinkListSearchDirection.Ascending) ? "front" : "back", Environment.NewLine, item.Value);
}
}
else
{
if (StringLinkedList.IsEmpty)
{
MessageBox.Show("Please load a file with string data.", "String Data Empty", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
MyLinkedListItem <string> item = StringLinkedList.FindItem(itemNumber, searchType);
if (item != null)
{
searchDataResult = string.Format("String data found at position {0} from {1} of linked list.{2}Value: {3}", itemNumber,
(searchType == MyLinkListSearchDirection.Ascending) ? "front" : "back", Environment.NewLine, item.Value);
}
}
txtFoundData.Text = searchDataResult;
}
