ASP.NET Core Razor - Post input, variable and string values

Marius Vasile

6y2.1k.NET

I am trying to save to table three values, one coming from cshtml input

class="col-2">
class="form-control border-warning" style="font-size:12px" asp-for="PTWContent.PTWType" asp-items="Html.GetEnumSelectList()">
"">Permit to Work Type
for="PTWContent.PTWType" class="text-danger">

one from a variable and one string from cshtml.cs

var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
var addPTW = new PTWContent();
if (await TryUpdateModelAsync(addPTW, "PTWContent", s => s.PTWType, s => s.UserID == userId, s => s.WorkComplete == "No"))
{
_context.PTWContents.Add(addPTW);
await _context.SaveChangesAsync();
return RedirectToPage("./PTW");
}

The error I get is

An unhandled exception occurred while processing the request.

InvalidOperationException: The passed expression of expression node type 'Equal' is invalid. Only simple member access expressions for model properties are supported.

Microsoft.AspNetCore.Mvc.ModelBinding.ModelBindingHelper.GetPropertyName(Expression expression)

3 Replies

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Marius Vasile6y ago
I found the solution, see below
var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);

            var addPTW = new PTWContent()
            {
                UserID = userId,
                WorkComplete="No"
            };

            if (await TryUpdateModelAsync(addPTW, "PTWContent", s => s.PTWType))
            {
                _context.PTWContents.Add(addPTW);
                await _context.SaveChangesAsync();
                return RedirectToPage("./PTW");
            }
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Marius Vasile6y ago
Hi Salman, yes, both are string type. Worth to mention that only PTWType value is written to table
0
Salman Beg6y ago
Hey i think the problem is with the lambda expression and equal symbol. Are you passing the same datatype in that?
s=>s.UserID==userId, in this are you using the same datatype for both s.UserID and userId, just check that.
Also check for s=>s.WorkComplete=="No".
Thanks.
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