Set value Entity Framework Core during OnGet - entity-framework-core

Question

I thought this would be simple...
If I want to force a value to a column/filed before the page loads, how do I do that?
Here's the lines from the Model:
[DataType(DataType.Currency)]
[Column(TypeName = "money")]
[Display(Name = "Contract Value")]
public decimal? ContractValue { get; set; } = 0m;
[DataType(DataType.Currency)]
[Column(TypeName = "money")]
[Display(Name = "Contract Expended")]
public decimal? ContractValueExpended { get; set; } = 0m;
And, here's what I tried using Fluent API.
modelBuilder.Entity<Contract>()
.Property(e => e.ContractValue)
.HasDefaultValue(0);
modelBuilder.Entity<Contract>()
.Property(e => e.ContractValueExpended)
.HasDefaultValue(0);
My bad. Here is create.cshtml.cs
public class CreateModel : GlobalPageModel
{
private readonly TawdryIndustries.Data.CompanyContext _context;
public CreateModel(TawdryIndustries.Data.CompanyContext context)
{
_context = context;
}
public IActionResult OnGet()
{
PopulateEmployeeNamesSelectList(_context);
PopulateCustomerNamesSelectList(_context);
return Page();
}
[BindProperty]
public Contract Contract { get; set; }
public async Task<IActionResult> OnPostAsync()
{
var emptyContract = new Contract();
if (await TryUpdateModelAsync<Contract>(
emptyContract,
"Contract",
c => c.ContractID,
c => c.ContractNumber,
c => c.ContractName,
c => c.CustomerID,
c => c.ContractAwardDate,
c => c.ContractBegDate,
c => c.ContractEndDate,
c => c.ContractValue,
c => c.ContractValueExpended,
c => c.ContractManagerID))
{
_context.Contracts.Add(emptyContract);
await _context.SaveChangesAsync();
return RedirectToPage("./Index");
}
PopulateEmployeeNamesSelectList(_context, emptyContract.ContractManagerID);
PopulateCustomerNamesSelectList(_context, emptyContract.CustomerID);
return Page();
}
And, here is the razor page (create.cshtml):
#page
#model TawdryIndustries.Pages.Contracts.CreateModel
#{
ViewData["Title"] = "Create";
}
<h1>Create</h1>
<h4>Contract</h4>
<hr />
<form method="post">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<table class="table">
<tr>
<td>
<label asp-for="Contract.CustomerID" class="control-label"></label>
<select asp-for="Contract.CustomerID" class="form-control"
asp-items="#Model.CustomerNameSL">
<option value="">-- Select Customer --</option>
</select>
<span asp-validation-for="Contract.CustomerID" class="text-danger"></span>
</td>
<td>
<label asp-for="Contract.ContractNumber" class="control-label"></label>
<input asp-for="Contract.ContractNumber" class="form-control" />
<span asp-validation-for="Contract.ContractNumber" class="text-danger"></span>
</td>
<td>
<label asp-for="Contract.ContractName" class="control-label"></label>
<input asp-for="Contract.ContractName" class="form-control" />
<span asp-validation-for="Contract.ContractName" class="text-danger"></span>
</td>
</tr>
<tr>
<td>
<label asp-for="Contract.ContractAwardDate" class="control-label"></label>
<input asp-for="Contract.ContractAwardDate" class="form-control" />
<span asp-validation-for="Contract.ContractAwardDate" class="text-danger"></span>
</td>
<td>
<label asp-for="Contract.ContractBegDate" class="control-label"></label>
<input asp-for="Contract.ContractBegDate" class="form-control" />
<span asp-validation-for="Contract.ContractBegDate" class="text-danger"></span>
</td>
<td>
<label asp-for="Contract.ContractEndDate" class="control-label"></label>
<input asp-for="Contract.ContractEndDate" class="form-control" />
<span asp-validation-for="Contract.ContractEndDate" class="text-danger"></span>
</td>
</tr>
<tr>
<td>
<label asp-for="Contract.ContractValue" class="control-label"></label>
<input asp-for="Contract.ContractValue" class="form-control" />
<span asp-validation-for="Contract.ContractValue" class="text-danger"></span>
</td>
<td>
<label asp-for="Contract.ContractValueExpended" class="control-label"></label>
<input asp-for="Contract.ContractValueExpended" class="form-control" />
<span asp-validation-for="Contract.ContractValueExpended" class="text-danger"></span>
</td>
<td>
<label asp-for="Contract.ContractManagerID" class="control-label"></label>
<select asp-for="Contract.ContractManagerID" class="form-control"
asp-items="#Model.EmployeeNameSL">
<option value="">-- Select Manager --</option>
</select>
<span asp-validation-for="Contract.ContractManagerID" class="text-danger"></span>
</td>
</tr>
<tr>
<td>
<input type="submit" value="Create" class="btn btn-primary" />
</td>
</tr>
</table>
</form>
<div>
<a asp-page="Index">Back to List</a>
</div>
#section Scripts {
#{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}
However, when the page is displayed (in create specifically), both of those fields are still blank. I want to force both fields to 0 when a new contract is created before the page loads.
For that matter, is there any way to set a value for a variable before a page loads?
In ASP.NET I would
<html>
<head></head>
<body>
<asp:textbox id="mytext" runat="server"></asp:textbox>
</body>
and:
protected void Page_Load(object sender, EventArgs e)
{
string somevar = "This is a test";
mytext.Text = somevar;
}
And the text box would contain "This is a test" when the page was displayed.
What is the equivalent in EF Core?
Thanks,
John