So I've created an HTML table on a Razor page as shown below. Basically I'm just calling a method that returns a list and then using a foreach to go create the rows and controls. The part I'm completely lost on is how I go about posting this data back to the server and on the code behind using that data to insert back to SQL Server. I'm using Dapper and I'd like each row of the table to represent a data row, or one object, but how do I get the data from the Razor page passed back as a list of a class? Not sure if my terminology is accurate here but can you model bind on a list of a type? Would appreciate some assistance thanks!
It seems I'm so far off track (or so few people use asp.net core and Dapper) that I'm not getting any help. But someone very helpful marked down my question without commenting - thanks so much.
I realised the key thing I was doing wrong was trying to circumvent model binding, so I created a class/type Rating that represents each row (each column as a property) and then an Assessment type/class that contains a List as one of the properties.
On the Razor page:
#foreach (Comp c in Model.GetComps())
{
count++;
Model.assessment.Ratings.Add(new Rating());
Model.assessment.Ratings[count].AchievedCompetencyID = c.AchievedCompetencyID;
Code behind:
public void OnPost()
{
using (IDbConnection con = new SqlConnection(Startup.conStr))
{
long assessID = con.Insert(assessment);
foreach (Rating r in assessment.Ratings)
{
r.AssessmentID = Convert.ToInt32(assessID);
con.Insert(r);
}
}
}
Related
I'm using entity framework v6.2.0 and ASP Net MVC to create a web page to access a database and edit the entries. The overwhelming majority of the code is the basic framework provided for me. The database is connected successfully and entries can be viewed, edited, and deleted. Additionally I have implemented some rudimentary paging, searching, and sorting as instructions are provided by microsoft on how to implement those. The last thing I need to do before the site is truly functional is to pull the userID from the users login and save that as the EnteredBy field before saving any changes or new entries to the table.
if (ModelState.IsValid)
{
string currentUserId = User.Identity.GetUserId();
yasukosKitchen.EnteredBy = currentUserId;
db.YasukosKitchens.Add(yasukosKitchen);
db.SaveChanges();
return RedirectToAction("Index");
}
This code seems very simple, and I added using Microsoft.AspNet.Identity; so it compiles fine. However when I attempt to test this code the EnteredBy field is left blank or null.
My search for information turned up a post suggesting the use of the following line of code.
ApplicationUser currentUser = db.Users.FirstOrDefault(x => x.Id == currentUserId);
However when I attempt to add that I get an error, the ApplicationUser cannot be found and Users does not exist in this context. The fix for this is probably staring me in the face but my lack of experience and comprehension is killing me.
As suggested: My question is, how do I get and/or correctly add the UserId to my database entry?
If your Database Context has an entry to your YasukosKitchen table; usually something like this,
public virtual DbSet<YasukosKitchen> YasukosKitchens {get; set;}
and YasukosKitchen table has a column 'EnteredBy' (string 128 length), then you can post the value for the logged in user's Id straight from the View.
Add this to the very beginning of the Create view.
#using Microsoft.AspNet.Identity
#using Microsoft.AspNet.Identity.EntityFramework
At the end of the form just before the submit button, add this code.
#Html.HiddenFor(model => model.EnteredBy, new { #Value = User.Identity.GetUserId() })
I'm not sure what is the functionality of 'Users' table.
I'm trying to show the results from a stored procedure on a view. I have a ASP.NET MVC application with the following code. I used EntityFramework to generate the models.
public class ProjectsController : Controller
{
private DatabaseEntities db = new DatabaseEntities();
// GET: Projects
public ActionResult Index()
{
var projects = db.Projects.Include(p => p.Headquarter);
return View(projects.ToList(), db.CALCULATEBUDGET());
}
}
I get the following errors on this part: db.CALCULATEBUDGET()
Argument 1: cannot convert from 'System.Collections.Generic.List<TestApplication.Models.Project>' to 'string' TestApplication C:\TestApplication\TestApplication\Controllers\ProjectsController.cs 21 Active
Argument 2: cannot convert from 'System.Data.Entity.Core.Objects.ObjectResult<TestApplication.Models.CALCULATEBUDGET_Result>' to 'string' TestApplication C:\TestApplication\TestApplication\Controllers\ProjectsController.cs 21 Active
My stored procedure:
CREATE PROCEDURE dbo.CALCULATEBUDGET
AS
SELECT MonthlyRent, Budget, 100 * H.MonthlyRent/P.Budget AS RentPercentage
FROM Headquarter H, Project P
WHERE H.HeadquarterId = P.Headquarter_HeadquarterId
I'm trying to calculate how much percent the rent is from the budget. And then I want to show the results in a view.
first of all, when you return a View you need to either pass the name or leave it empty and then it works out using the defaults. You can pass a model as well, but what you've done is to pass two data items. The first one needs to be a View name:
return View( "YourViewName", yourDataModel);
The main concept of MVC is this : here is a View and here is the data for a View in the form of a model.
Directly throwing objects from a database at a view is usually a bad idea, I would suggest you decouple your things a little bit.
Have a business layer where you get the data, you map into a model object which matches what the view needs to display. Think of that as a translation layer from what your data looks like and what your View needs to display. Rule of thumb, only send to a View whatever it needs to display and nothing more.
You can combine multiple multiple data items in one data model for the View if that's what you need, but you still pass just one object to your View.
I am new in ASP.NET MVC 4. In my project I am using Code First technique in of EF. I want to retrieve some data from database and I used following code for this :
List<SelectListItem> ls = new List<SelectListItem>();
var lm = from m in db.BOs //fetch data from database
select m;
foreach (var temp in lm)
{
ls.Add(new SelectListItem() { Text = temp.Name, Value = temp.Id.ToString() });
}
But when execution pointer move inside foreach it immediately come back out of the loop showing return ls value Count = 0. Code does not giving me any error while running that's why I am not getting where is going wrong.
UPDATE: I found something new this problem. When I kept mouse pointer over var lm; it shows me query and in query table name in FROM clause is not that one in my SQL database. My SQL table name is BO and in query it is taking BOes. I don't know from where this name is coming. So How I overcome this??
decorate your BO class with Table("BO") to specify the table name (attribute is in System.ComponentModel.DataAnnotations.Schema namespace)
[Table("BO")]
public partial class BO
{
...
Write following code inside DbContext class :
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
The modelBuilder.Conventions.Remove statement in the OnModelCreating method prevents table names from being pluralized. If you didn't do this, the generated tables would be named Students, Courses, and Enrollments. Instead, the table names will be Student, Course, and Enrollment. Developers disagree about whether table names should be pluralized or not. This tutorial uses the singular form, but the important point is that you can select whichever form you prefer by including or omitting this line of code.
I have a object Ob with several fields f1,..,fn (of different types).
Now a list of object is shown in a GridView and I need to implement the sorting method.
The real problem is:
how can I run
(from ob in Ob_list orderby ob.f1 ascending)
when the sorting field is represented by a string (i.e. "f1")?
Unfortunately I am not able to get it with the reflection (I am not able to do something like ob.GetType().GetField("f1"), this is not mapped into sql code).
I have several fields to possibly sort the rows, which is the best&fastest approach to this?
Thank you very much!
LINQ execution is deferred until you actually enumerate over the results or access the "count", etc. Because of this, you can build up your LINQ statement in stages.
The below code is done in C#, but I'm sure the equivalent is possible in VB.NET.
First setup your basic query:
var query = (from ob in Ob_list);
At this point, nothing has actually gone to the database due to deferred execution.
Next, conditionally add your order by components:
if (sortField == "f1")
{
query = query.OrderBy(o => o.f1);
}
else if (sortField == "f2")
{
query = query.OrderBy(o => o.f2);
}
else
{
//...
}
And finally, collect your results
foreach (var item in query)
{
// Process the item
}
I've found this question: How do I specify the Linq OrderBy argument dynamically?
I'm using Entity Framework, so the first answer did not solved my problem. The second one however, worked great!
Hope it helps!
This is a continuation of my previous question: Could not find an implementation of the query pattern
I'm trying to insert a new 'Inschrijving' into my database. I try this with the following code:
[OperationContract]
public void insertInschrijving(Inschrijvingen inschrijving)
{
var context = new DataClassesDataContext();
context.Inschrijvingens.InsertOnSubmit(inschrijving);
dc.SubmitChanges();
}
But the context.Inschrijvingens.InsertOnSubmit(inschrijving); gives me the following error:
cannot convert from 'OndernemersAward.Web.Service.Inschrijvingen' to 'OndernemersAward.Web.Inschrijvingen'
I call the method in my main page:
Inschrijvingen1Client client = new Inschrijvingen1Client();
Inschrijvingen i = new Inschrijvingen();
client.insertInschrijvingCompleted += new EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(client_insertInschrijvingCompleted);
client.insertInschrijvingAsync(i);
But as you can see there appears to be something wrong with my Inschrijvingen class, which is auto generated by LINQ. (Auto generated class can be found here: http://pastebin.com/QKuAAKgV)
I'm not entirely sure what is causing this, but I assume it has something to do with the auto generated class not being correct?
Thank you for your time,
Thomas
The problem is that you've got two Inschrijvingen classes - one in the OndernemersAward.Web.Service namespace, and one in the OndernemersAward.Web namespace.
You either need to change the codebase so that you've only got one class, or you need to convert from one type to the other.