How does MVC ViewData work?
- by Matt
I am toying around with an MVC application just to learn the technology. I am mocking up a check register application that keeps track of a checking account, what has cleared the bank and what has not. I am using EF for my model and everything seems to be working correctly insofar as Edit, Create, etc. However, I have a couple of totals at the top. One to show the bank's balance and another to show the actual balance. It works most of the time but when I do Edit's it does not always accurately reflect the new total and I need it to update everytime a change is made (i.e when something clears the bank):
[Authorize(Roles = "admin, checkUser")]
public ActionResult Index()
{
var resultSet = from myChecking in chk.tblCheckings
orderby myChecking.id descending
select myChecking;
ViewData.Model = resultSet.Take(45).ToList();
//for balances
var actualBalance = from theChecking in chk.tblCheckings
select theChecking.deposit - theChecking.withdrawal;
var bankBalance = from theChecking in chk.tblCheckings
where theChecking.cleared == true
select theChecking.deposit - theChecking.withdrawal;
//get bank balance
ViewData["bankBalance"] = bankBalance.Sum();
//get actual balance
ViewData["actualBalance"] = actualBalance.Sum();
return View();
}
I am showing the actual and other balance in the Index view as follows:
<td colspan="9" style="text-align: center; font-size: 11pt; color: white;">
<%= string.Format("Bank Balance: {0:c}", ViewData["bankBalance"]) %> ------
<%= string.Format("Actual Balance: {0:c}", ViewData["actualBalance"]) %>
</td>
