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

Question

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)

Marius Vasile · Answer

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" ); }

Marius Vasile · Answer

Hi Salman, yes, both are string type. Worth to mention that only PTWType value is written to table

Salman Beg · Answer

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.