Why isn't my WCF/WPF service working?

Question

This is my structure and what I did:

WCF

add Entity Framework

IService

add [OperationContract] in IService1
create DTO classes for things I needed

Service

in Service1 create class variable "Entity entity= new Entity()"
used LINQ to geht the stuff i needed, e.g.:

        var list = from sale in pubs.sales  
                   select new SalesDTO  
                   {  
                       OrderDate = sale.ord_date,  
                       OrderNum = sale.ord_num,  
                       Quantity = sale.qty,  
                       PaymentTerms = sale.payterms,  
                       Title = new TitlesDTO  
                       {  
                           Title = sale.titles.title,  
                           TitleId = sale.titles.title_id  
                       },  
                       Store = new StoresDTO  
                       {  
                           StoreName = sale.stores.stor_name,  
                           StoreId = sale.stores.stor_id  
                       }  
                   };  

updated some data:

    public void UpdateSales(SalesDTO dto)  
    {  
        pubsEntities pubs = new pubsEntities();  
        bool gefunden = false;  

        foreach (sales sale in pubs.sales)  
        {  
            if(sale.ord_num.Equals(dto.OrderNum) && sale.title_id.Equals(dto.Title.TitleId) && sale.stor_id.Equals(dto.Store.StoreId))  
            {  
                sale.ord_date = dto.OrderDate;  
                sale.payterms = dto.PaymentTerms;  
                sale.qty = dto.Quantity;  
                gefunden = true;  
                break;  
            }  
        }  

        if (!gefunden)  
        {  
            sales sale = new sales  
            {  
                ord_date = dto.OrderDate,  
                ord_num = dto.OrderNum,  
                payterms = dto.PaymentTerms,  
                qty = dto.Quantity,  
                title_id = dto.Title.TitleId,  
                stor_id = dto.Store.StoreId  
            };  
            pubs.sales.Add(sale);  
        }  

        pubs.SaveChanges();  
    }  

DataGrid

<DataGrid.Columns>
<DataGridTextColumn Header="Order Number" Binding="{Binding OrderNum,
UpdateSourceTrigger=PropertyChanged}" />
<DataGridComboBoxColumn Header="Title" ItemsSource="{Binding Source={
StaticResource Titles}}" DisplayMemberPath="Title" SelectedValuePath="
TitleId" SelectedItemBinding="{Binding Title.Title}"
SelectedValueBinding="{Binding Title.TitleId}" />
<DataGridComboBoxColumn Header="Store" ItemsSource="{Binding Source={
StaticResource Stores}}" DisplayMemberPath="StoreName"
SelectedValuePath="StoreId" SelectedItemBinding="{Binding Store.
StoreName}" SelectedValueBinding="{Binding Store.StoreId}" />
<DataGridTemplateColumn Header="OrderDate">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<DatePicker SelectedDate="{Binding OrderDate}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<DatePicker SelectedDate="{Binding OrderDate}" />
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Header="Quantity" Binding="{Binding Quantity,
UpdateSourceTrigger=PropertyChanged}" />
<DataGridTextColumn Header="Payment Terms" Binding="{Binding PaymentTerms
, UpdateSourceTrigger=PropertyChanged}" />
</DataGrid.Columns>

WPF

create Connected Service (rightclick WPF, add, Connected Service)

MainWindow.xaml.cs

add "ServiceReference2.Service1Client client = new ServiceReference2.Service1Client();"

    public MainWindow()  
    {  
        InitializeComponent();  
        DataContext = this;  
        datagrid.ItemsSource = client.GetAllSales();  
        Stores = client.GetAllStores();  
        Titles = client.GetAllTitles();  
        handle = true;  
    }  

    private void DataGrid_RowEditEnding(object sender, DataGridRowEditEndingEventArgs e)  
    {  
        if (handle)  
        {  
            handle = false;  
            datagrid.CommitEdit();  
            ServiceReference2.SalesDTO dto = e.Row.DataContext as ServiceReference2.SalesDTO;  
            client.UpdateSales(dto);  
            handle = true;  
            datagrid.ItemsSource = client.GetAllSales();  
        }  
    }  

ASP.NET

new Project, "ASP:NET Web Application"
don't write code into "Default.aspx", write it into "Defaultaspx.cs"
in "Default.aspx" use on the left "Toolbox" for needed tools

ASP Events

<asp:DropDownList runat="server" id="GreetList" autopostback="true">
<asp:ListItem value="no one">No one</asp:ListItem>
<asp:ListItem value="world">World</asp:ListItem>
<asp:ListItem value="universe">Universe</asp:ListItem>
</asp:DropDownList>

<asp:DropDownList runat="server" id="GreetList" autopostback="true" onselectedindexchanged="GreetList_SelectedIndexChanged">

Code behind

protected void GreetList_SelectedIndexChanged(object sender, EventArgs e)
{
HelloWorldLabel.Text = "Hello, " + GreetList.SelectedValue;
}

WIndows Auth

using Microsoft.AspNetCore.Authentication.Negotiate;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddAuthentication(NegotiateDefaults.AuthenticationScheme)
.AddNegotiate();

builder.Services.AddAuthorization(options =>
{
options.FallbackPolicy = options.DefaultPolicy;
});
builder.Services.AddRazorPages();

var app = builder.Build();

if (!app.Environment.IsDevelopment())
{
app.UseExceptionHandler("/Error");
app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthentication();
app.UseAuthorization();

app.MapRazorPages();

app.Run();

Answer 1

If you receive HTTP 404.17 - Not Found can the following articles help?

What causes WCF Error 404.17 to be shown?
https://stackoverflow.com/questions/25532110/what-causes-wcf-error-404-17-to-be-shown

HTTP Error 404.17 - Not Found
https://stackoverflow.com/questions/7083533/http-error-404-17-not-found

Answer 2

package com.example.verbesserung;

import com.example.verbesserung.Model.Absence;
import com.example.verbesserung.Model.Pupil;

import java.util.*;

public class DataStore {

private static DataStore instance;  
private Set<Pupil> pupils = new HashSet<>();  

private DataStore() {  
    UUID uuid = UUID.randomUUID();  
    pupils.add(new Pupil(uuid));  
    Absence absence = new Absence();  
    getPupilById(uuid).get().addAbsence(absence);  
    getPupilById(uuid).get().addAbsence(absence);  
    System.out.println("\n\n----------------------------------- Size = " + getPupilById(uuid).get().getAbsences().size() + "-----------------------------------------");  
}  

public static DataStore getInstance() {  
    if (instance == null) {  
        instance = new DataStore();  
    }  
    return instance;  
}  

public Set<Pupil> getPupils(){  
    return pupils;  
}  

public Optional<Pupil> getPupilById(UUID id) {  
    return pupils.stream()  
            .filter(pupil -> pupil.getId().equals(id))  
            .findFirst();  
}  

public void addPupil(Pupil p){  
    pupils.add(p);  
}  

}

Answer 3

<%@ page import="javax.xml.crypto.Data" %>
<%@ page import="com.example.verbesserung.DataStore" %>
<%@ page import="com.example.verbesserung.Model.Pupil" %>
<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<title>JSP - Hello World</title>
</head>
<body>
<h1><%= "Hello World!" %>
</h1>
<br/>
<a href="anzeige-berechnung">Hello Servlet</a>

<form action="anzeige-berechnung" method="post">

<label for="pupils">Waehlen Sie einen Schueler:</label>  

<select name="pupils" id="pupils">  
<% for(Pupil p : DataStore.getInstance().getPupils()){ %>  
    <option value="<%=p.getId()%>"><%=p.getFirstName() + " " + p.getLastName()%></option>  
<% } %>  
</select>  

<br>  
<input type="submit" name="Abwesenheiten anzeigen">  

</form>

</body>
</html>

--------------------------

package com.example.verbesserung.Servlets;

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.UUID;

import com.example.verbesserung.DataStore;
import com.example.verbesserung.Model.Absence;
import com.example.verbesserung.Model.Pupil;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.;
import jakarta.servlet.annotation.;

@WebServlet(name = "anzeige-berechnung", value = "/anzeige-berechnung")
public class HelloServlet extends HttpServlet {
private String message;

public void init() {  
    message = "Hello World!";  
}  

public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {  
    response.setContentType("text/html");  

    // Hello  
    PrintWriter out = response.getWriter();  
    out.println("<html><body>");  
    out.println("<h1>" + message + "</h1>");  
    out.println("</body></html>");  
}  

public void destroy() {  
}  

@Override  
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {  
    String id = req.getParameter("pupils");  

    Pupil pupil = DataStore.getInstance().getPupilById(UUID.fromString(id)).get();  
    ArrayList<Absence> absenceList = pupil.getAbsences();  

    req.setAttribute("pupilBean",absenceList);  
    req.getRequestDispatcher("anzeige.jsp").forward(req,resp);  

    /*  
    <select name="cars" id="cars">  
    <%=for(Pupil p : DataStore.getInstance().getPupils())%>  
    <option value="volvo">Volvo</option>  
    <option value="saab">Saab</option>  
    <option value="opel">Opel</option>  
    <option value="audi">Audi</option>  
</select>  

     */  
}  

}

--------------------------------------------

<%@ page import="com.example.verbesserung.Model.Pupil" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="com.example.verbesserung.Model.Absence" %><%--
Created by IntelliJ IDEA.
User: Startklar
Date: 22.05.2022
Time: 12:09
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
<jsp:useBean id="pupilBean" type="java.util.ArrayList<com.example.verbesserung.Model.Absence>" scope="request"></jsp:useBean>
</head>
<body>
<table border="1">
<tr>
<th>ID</th>
<th>From</th>
<th>To</th>
<th>Reason</th>
<th>Excused?</th>
</tr>

    <%  
        for(Absence absence : pupilBean){  
            out.println("<tr>");  
            out.println("<td>" + absence.getId() + "</td>");  
            out.println("<td>" + absence.getFrom() + "</td>");  
            out.println("<td>" + absence.getTo() + "</td>");  
            out.println("<td>" + absence.getReason() + "</td>");  
            out.println("<td>" + absence.getExcused() + "</td>");  
            out.println("</tr>");  
        }  
    %>  


</table>  

</body>
</html>

----------------------

package com.example.verbesserung.Interface;

import com.example.verbesserung.Model.Absence;
import jakarta.json.Json;
import jakarta.ws.rs.*;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;

import java.util.UUID;

public interface IPupil {
@POST
@Consumes(MediaType.APPLICATION_JSON)
@mutia keyza ("{pupil_id}/absence")
public Response neueAbwesenheit(@PathParam("pupil_id") UUID pupil_id, Absence absence);

@GET  
@Produces(MediaType.APPLICATION_JSON)  
@Path("{pupil_id}/absence/{absence_id}")  
public Response abwesenheitAbrufen(@PathParam("pupil_id") UUID pupil_id,  
                                   @PathParam("absence_id") UUID absence_id);  

@PUT  
@Path("{pupil_id}/absence/{absence_id}/excuse")  
public Response entschuldigen(@PathParam("pupil_id") UUID pupil_id,  
                              @PathParam("absence_id") UUID absence_id);  

}