.Net API

DotNet Projects API's Practice

.Net Web API Projects

-1 Simple web api Project
-2 Empolyee Web api Project
-3 Semi Advance web api project
-4 Token Based Auth

.Net API

HTTP verbs

Click to expand!

HTTP Verb	CRUD	Entire Collection (e.g. /customers)	Specific Item (e.g. /customers/{id})
POST	Create	201 (Created), 'Location' header with link to /customers/{id} containing new ID.	404 (Not Found), 409 (Conflict) if resource already exists..
GET	Read	200 (OK), list of customers. Use pagination, sorting and filtering to navigate big lists.	200 (OK), single customer. 404 (Not Found), if ID not found or invalid.
PUT	Update/Replace	405 (Method Not Allowed), unless you want to update/replace every resource in the entire collection. 200 (OK) or 204 (No Content). 404 (Not Found), if ID not found or invalid.
PATCH	Update/Modify	405 (Method Not Allowed), unless you want to modify the collection itself.	200 (OK) or 204 (No Content). 404 (Not Found), if ID not found or invalid.
DELETE	Delete	405 (Method Not Allowed), unless you want to delete the whole collection—not often desirable. 200 (OK).	404 (Not Found), if ID not found or invalid.

Docs

Click to expand!

-1 Web API Content Negotiation

Accetpt:application/xml
Accetpt:application/json

jsonpFormatter

Click to expand!

-1 Install NuGet Package.

1.1-Package Manager Console.

Use this cmd in VS Terminal
Install-Package WebApiContrib.Formatting.Jsonp

2 Add NameSpace

using WebApiContrib.Formatting.Jsonp;

3 Edit Config file

Open the file App_Start/WebApiConfig.cs. Add the following code to the WebApiConfig.Register method:

var jsonpFormatter = new JsonpMediaTypeFormatter(config.Formatters.JsonFormatter);
config.Formatters.Insert(0, jsonpFormatter);

From this

 public static void Register(HttpConfiguration config)
      {
          // Web API configuration and services
          // Configure Web API to use only bearer token authentication.
          config.SuppressDefaultHostAuthentication();
          config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

          // Web API routes
          config.MapHttpAttributeRoutes();

          config.Routes.MapHttpRoute(
              name: "DefaultApi",
              routeTemplate: "api/{controller}/{id}",
              defaults: new { id = RouteParameter.Optional }
          );
      }

To this

  public static void Register(HttpConfiguration config)
      {
          // Web API configuration and services
          // Configure Web API to use only bearer token authentication.
          config.SuppressDefaultHostAuthentication();
          config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

          // Web API routes
          config.MapHttpAttributeRoutes();

          config.Routes.MapHttpRoute(
              name: "DefaultApi",
              routeTemplate: "api/{controller}/{id}",
              defaults: new { id = RouteParameter.Optional }
          );
          var jsonpFormatter = new JsonpMediaTypeFormatter(config.Formatters.JsonFormatter);
          config.Formatters.Insert(0, jsonpFormatter); 
      }

Methods

Default Methods

Click to expand!

public class ValuesController : ApiController
{
  static List<string> strings = new List<string>()
  {
      "value0", "value1", "value2"
  };
  // GET api/values
  public IEnumerable<string> Get()
  {
      return strings;
  }

  // GET api/values/5
  public string Get(int id)
  {
      return strings[id];
  }

  // POST api/values
  public void Post([FromBody]string value)
  {
      strings.Add(value);
  }

  // PUT api/values/5
  public void Put(int id, [FromBody]string value)
  {
      strings[id] = value;
  }

  // DELETE api/values/5
  public void Delete(int id)
  {
      strings.RemoveAt(id);
  }
}

Methods for EntityFramework

Click to expand!

Get

Click to expand!

 public IEnumerable<Employee> Get()
      {
          using(EmployeeDBEntities entities = new EmployeeDBEntities())
          {
              return entities.Employees.ToList();
          }
      }

Get (int Id)

Click to expand!

 public Employee Get(int id)
      {
          using (EmployeeDBEntities entities = new EmployeeDBEntities())
          {
              return entities.Employees.FirstOrDefault(e => e.ID == id);
          }
      }

Get (int Id) [HttpResponseMessage]

Click to expand!

public HttpResponseMessage Get(int id)
{
  using (EmployeeDBEntities entities = new EmployeeDBEntities())
  {
      var entity = entities.Employees.FirstOrDefault(e => e.ID == id);
      if (entity != null)
      {
          return Request.CreateResponse(HttpStatusCode.OK, entity);
      }
      else
      {
          return Request.CreateErrorResponse(HttpStatusCode.NotFound,
              "Employee with Id " + id.ToString() + " not found");
      }
  }
}

Post ([FromBody] Employee employee)

Click to expand!

 public void Post([FromBody] Employee employee)
{
  using (EmployeeDBEntities entities = new EmployeeDBEntities())
  {
      entities.Employees.Add(employee);
      entities.SaveChanges();
  }
}

Post ([FromBody] Employee employee) [HttpResponseMessage]

Click to expand!

public HttpResponseMessage Post([FromBody] Employee employee)
{
  try
  {
      using (EmployeeDBEntities entities = new EmployeeDBEntities())
      {
          entities.Employees.Add(employee);
          entities.SaveChanges();

          var message = Request.CreateResponse(HttpStatusCode.Created, employee);
          message.Headers.Location = new Uri(Request.RequestUri +
              employee.ID.ToString());

          return message;
      }
  }
  catch (Exception ex)
  {
      return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ex);
  }
}

Delete (int id)

Click to expand!

 public void Delete(int id)
{
  using (EmployeeDBEntities entities = new EmployeeDBEntities())
  {
      entities.Employees.Remove(entities.Employees.FirstOrDefault(e => e.ID == id));
      entities.SaveChanges();
  }
}

Delete (int id) [HttpResponseMessage]

Click to expand!

public HttpResponseMessage Delete(int id)
{
  try
  {
      using (EmployeeDBEntities entities = new EmployeeDBEntities())
      {
          var entity = entities.Employees.FirstOrDefault(e => e.ID == id);
          if (entity == null)
          {
              return Request.CreateErrorResponse(HttpStatusCode.NotFound,
                  "Employee with Id = " + id.ToString() + " not found to delete");
          }
          else
          {
              entities.Employees.Remove(entity);
              entities.SaveChanges();
              return Request.CreateResponse(HttpStatusCode.OK);
          }
      }
  }
  catch (Exception ex)
  {
      return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ex);
  }
}

Put (int id, [FromBody]Employee employee)

Click to expand!

public void Put(int id, [FromBody]Employee employee)
{
  using (EmployeeDBEntities entities = new EmployeeDBEntities())
  {
      var entity = entities.Employees.FirstOrDefault(e => e.ID == id);

      entity.FirstName = employee.FirstName;
      entity.LastName = employee.LastName;
      entity.Gender = employee.Gender;
      entity.Salary = employee.Salary;

      entities.SaveChanges();
  }
}

Put (int id, [FromBody]Employee employee) [HttpResponseMessage]

Click to expand!

public HttpResponseMessage Put(int id, [FromBody]Employee employee)
{
  try
  {
      using (EmployeeDBEntities entities = new EmployeeDBEntities())
      {
          var entity = entities.Employees.FirstOrDefault(e => e.ID == id);
          if (entity == null)
          {
              return Request.CreateErrorResponse(HttpStatusCode.NotFound,
                  "Employee with Id " + id.ToString() + " not found to update");
          }
          else
          {
              entity.FirstName = employee.FirstName;
              entity.LastName = employee.LastName;
              entity.Gender = employee.Gender;
              entity.Salary = employee.Salary;

              entities.SaveChanges();

              return Request.CreateResponse(HttpStatusCode.OK, entity);
          }
      }
  }
  catch (Exception ex)
  {
      return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ex);
  }
}

Method Customization

Query string parameters

Click to expand!

Get(string gender = "All")

Click to expand!

public HttpResponseMessage Get(string gender = "All")
{
  using (EmployeeDBEntities entities = new EmployeeDBEntities())
  {
      switch (gender.ToLower())
      {
          case "all":
              return Request.CreateResponse(HttpStatusCode.OK,
                  entities.Employees.ToList());
          case "male":
              return Request.CreateResponse(HttpStatusCode.OK,
                  entities.Employees.Where(e => e.Gender.ToLower() == "male").ToList());
          case "female":
              return Request.CreateResponse(HttpStatusCode.OK,
                  entities.Employees.Where(e => e.Gender.ToLower() == "female").ToList());
          default:
              return Request.CreateErrorResponse(HttpStatusCode.BadRequest,
                  "Value for gender must be Male, Female or All. " + gender + " is invalid.");
      }
  }
}

Retrieve Data from Multiple tables

Click to expand!

Tabels:

Users,
Roles,
UserRoles,
Subjects,
SubjectAuthors

Code

Step-1: Code for Custom List

 public class AuthorsList
      {
          public string Id { get; set; }
          public string Email { get; set; }
          public string Name { get; set; }
          public string UserId { get; set; }
          public string RoleId { get; set; }
          public string Username { get; set; }
          public string SubjectId { get; set; }
      }

Step-2 Code for Qurey

  // GET: api/master/authors
      [AllowAnonymous]
      [Route("api/master/Authors")]
      public List<AuthorsList> GetAuthors()
      {
          AuthorsList authorlisst = new AuthorsList();
         var _autobj = (from r in entities.AspNetUserRoles
                         where r.AspNetRole.Name == "AUTHOR"
                         select new
                         {
                             r.UserId,
                             r.AspNetUser.Email,
                             r.AspNetUser.SubjectAuthors.FirstOrDefault().SubjectId,
                             r.AspNetUser.SubjectAuthors.FirstOrDefault().Subject.Name
                         }).ToList();
          List<AuthorsList> authList = new List<AuthorsList>();
          foreach (var _autitem in _autobj)
          {
              authList.Add(new AuthorsList { UserId = _autitem.UserId, Email = _autitem.Email, 
                  SubjectId = _autitem.SubjectId.ToString(), Name = _autitem.Name });
          }

          return authList;
      }

Step-3: Output

[{"$id":"1","Id":null,"Email":"alex@g.com","Name":"Dermatology","UserId":"c8e5444a-f9df-4fae-b7c3-837672316ddc","RoleId":null,"Username":null,"SubjectId":"4"},{"$id":"2","Id":null,"Email":"john@g.com","Name":"Anatomy","UserId":"e0113bbc-f5e6-4397-a329-960c8b8a4f11","RoleId":null,"Username":null,"SubjectId":"6"}]

cross-origin requests

Click to expand!

-1 Install NuGet Package.

1.1-Package Manager Console.

Use this cmd in VS Terminal
Install-Package Microsoft.AspNet.WebApi.Cors

2 Include the following 2 lines of code in Register() method of WebApiConfig class in WebApiConfig.cs file in App_Start folder

EnableCorsAttribute cors = new EnableCorsAttribute("*", "*", "*");
config.EnableCors(cors);

Code Demo

From this

 public static void Register(HttpConfiguration config)
      {
          // Web API configuration and services
          // Configure Web API to use only bearer token authentication.
          config.SuppressDefaultHostAuthentication();
          config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

          // Web API routes
          config.MapHttpAttributeRoutes();

          config.Routes.MapHttpRoute(
              name: "DefaultApi",
              routeTemplate: "api/{controller}/{id}",
              defaults: new { id = RouteParameter.Optional }
          );
      }

To this

  public static void Register(HttpConfiguration config)
      {
          // Web API configuration and services
          // Configure Web API to use only bearer token authentication.
          config.SuppressDefaultHostAuthentication();
          config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

          // Web API routes
          config.MapHttpAttributeRoutes();

          config.Routes.MapHttpRoute(
              name: "DefaultApi",
              routeTemplate: "api/{controller}/{id}",
              defaults: new { id = RouteParameter.Optional }
          );
          EnableCorsAttribute cors = new EnableCorsAttribute("*", "*", "*");
          config.EnableCors(cors);
      }

cross-origin .Net core requests

Click to expand!

1 Include the following 2 lines of code in Register() method of WebApiConfig class in WebApiConfig.cs file in App_Start folder

var myOrigins = "corspolicy";

builder.Services.AddCors(p => p.AddPolicy(myOrigins, build =>
{
  build.WithOrigins("*").AllowAnyMethod().AllowAnyHeader();
}));

app.UseCors(myOrigins); // enable the cors origin

Three ways to config corse

// allow all domains
//builder.Services.AddCors(p => p.AddPolicy("corspolicy", build =>
//{
//    build.WithOrigins("http://localhost:4200/").AllowAnyMethod().AllowAnyHeader();
//}));
// allow pertical domains
// allow all domains
//builder.Services.AddCors(p => p.AddPolicy("corspolicy", build =>
//{
//    build.WithOrigins("http://localhost:4200/","http://localhost:7200/").AllowAnyMethod().AllowAnyHeader();
//}));
// allow multipule domains

Code Demo

From this

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
  app.UseSwagger();
  app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();

To this

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
  app.UseSwagger();
  app.UseSwaggerUI();
}

var myOrigins = "corspolicy";

builder.Services.AddCors(p => p.AddPolicy(myOrigins, build =>
{
  build.WithOrigins("*").AllowAnyMethod().AllowAnyHeader();
}));

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();
app.UseCors(myOrigins); // enable the cors origin
app.Run();

Modify Token Response

Click to expand!

1 Update the following code in CreateProperties() method class in ApplicationOAuthProvider.cs file in Provider folder

Code Demo

From this

   public static AuthenticationProperties CreateProperties(string userName)
      {
          IDictionary<string, string> data = new Dictionary<string, string>
          {
              { "userName", userName }
          };
          return new AuthenticationProperties(data);
      }

To this

   public static AuthenticationProperties CreateProperties(string userName)
      {
          AchievedItDBEntities entities = new AchievedItDBEntities();

          var UserId = entities.AspNetUsers.Where(r => r.UserName == userName).FirstOrDefault().Id;
          var RoleId = entities.AspNetUserRoles.Where(r => r.UserId == UserId).FirstOrDefault().RoleId;
          var Role = entities.AspNetRoles.Where(r => r.Id == RoleId).FirstOrDefault().Name;
          string redirectURL = "";
          if (Role == "SuperAdmin".ToUpper())
          {
              redirectURL = "/SuperAdmin";
          }
          else if (Role == "Admin".ToUpper())
          {
              redirectURL = "/Admin";
          }
          else if (Role == "Verifier".ToUpper())
          {
              redirectURL = "/Verifier";
          }
          else if (Role == "User")
          {
              redirectURL = "/User";
          }
          else
          {
              redirectURL = "Invaild";
          }
          IDictionary<string, string> data = new Dictionary<string, string>
          {
              { "userName", userName },
              { "redirectURL", redirectURL}
          };
          return new AuthenticationProperties(data);
      }

Request Url Post Method

https://localhost:44338/token

Body

Username=admin4@test.com&Password=Abc123@Xxx&grant_type=password

API Response

{
"access_token":"Wm-2lne4f82ZFOcztiE_IjLyEq5MakfZw03kevDpxv_56fOIUX-j35cmizo98i9OjmcBiddJqLDKYCOqJc1QpFDL1XXY16CCFJpBx9Icg3ZZAeTX83Ii2uIolUjEy--KlaDrDE7oUCllZur8v-HyD91Q8sYS25X-tgeefYAGW_K1smzksBsz203mvmOL9f9XGMmA5EJHIg6bFay4f_y6K1v0liWS-CZc_YvqzSCPowPX5svsRywXeJeEploYwI4Mly7axW6tKBFsmQRPv7OTjp9OQhXSpA33wAH656IRCcA1IUPEMtgM5-A9ja8QIMDtht-ZQOGTE-HPimGcn7lxLzTJP7kwqYX9DOncJBZIXKafLMxNIEQRG-s7E7NZMs3sXL5v-XvZF6N4mdR37xJ1IUw8hiNvCfk8B23BBeC4R7-Uu6r4ZRqmLb7QgqOSFP440Sa-XXtPdDCjfCQBNSDX42eGKAzOIzBH9b8XGAJZ-JYjm0Ysv7WjbPvvqWEuKrz8RZA6YYWyHEXGNkERxnkdI7sRVx7oKvbJpZ3Jkm9mQxc",
"token_type":"bearer",
"expires_in":1209599,
"userName":"admin4@test.com",
"redirectURL":"/Admin",
".issued":"Fri, 25 Mar 2022 20:40:25 GMT",
".expires":"Fri, 08 Apr 2022 20:40:25 GMT"
}

JS / Jquery / Ajax

Click to expand!

[Get Request] - Display Data on HTML TABLE Jquery/Ajax with Entity framewrok

Click to expand!

HTML CODE for Table

  <div class=" row">
       <label id="tabledivErrorText"></label>
          <table class="table table-bordered" id="tblData">
             <thead>
               <tr class="success">
                   <th>Id</th>
                   <th>Name</th>
                   <th>Email</th>
                   <th>Phone</th>
                   <th>Age</th>
               </tr>
             </thead>
           <tbody id="tblBody"></tbody>
          </table>
  </div>

JS script

<script src="~/Scripts/jquery-3.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
    $(document).ready(function () {
       $.ajax({
        url: '/api/Member/GetFamilyMemberById/2',
        method: 'GET',
        success: function (data) {
            $('#tblBody').empty();
            $.each(data, function (index, value) {
                var row = $('<tr><td>'+ value.Id + '</td><td>'
                    + value.Name + '</td><td>'
                    + value.Email + '</td><td>'
                    + value.Phone + '</td><td>'
                    + value.Age + '</td></tr>');
                $('#tblData').append(row);
            });
        },
        error: function (jQXHR) {
            // If status code is 401, access token expired, so
            // redirect the user to the login page
            if (jQXHR.status == "401") {
                $('#tabledivErrorText').text("401");
            }
            else {
                $('#tabledivErrorText').text(jqXHR.responseText);
            }
        }
    });
  });
    </script>

API Get Method

private PerformanceTestDBEntities entities = new PerformanceTestDBEntities();
  // GET: api/GetListMembersId
  [ResponseType(typeof(Member))]
  [HttpGet]
  [Route("api/Member/GetFamilyMemberById/{Id}")]
  public IHttpActionResult GetFamilyMember(string id)
  {
      int ids = Convert.ToInt32(id);
      try
        {
         var _autobj = (from r in entities.FamilyMemberDetails
                       where r.Member.MemberId == ids
                        select new
                          {
                            r.MemberId,
                            r.Id,
                            r.Name,
                            r.Email,
                            r.Phone,
                            r.Age
               }).OrderByDescending(a => a.Age).ToList();
            
         return Ok(_autobj);
        }
    catch (DbUpdateConcurrencyException)
     {
      if (!MemberExists(ids))
       {
           return NotFound();
       }
       else
         {
            throw;
         }
      }
 }

[Post Request] - Jquery/Ajax - Create User

Click to expand!

<script type="text/javascript">
     $(document).ready(function () {

         // Save the new user details
         $('#btnRegister').click(function () {
             $.ajax({
                 url: '/api/account/register',
                 method: 'POST',
                 data: {
                     email: $('#txtEmail').val(),
                     password: $('#txtPassword').val(),
                     confirmPassword: $('#txtConfirmPassword').val()
                 },
                 success: function () {
                     $('#successModal').modal('show');
                 },
                 error: function (jqXHR) {
                     $('#divErrorText').text(jqXHR.responseText);
                 }
             });
         });
     });
 </script>

[Post Request] - Jquery/Ajax - Login User

Click to expand!

   <script type="text/javascript">
        $(document).ready(function () {

            $('#linkClose').click(function () {
                $('#divError').hide('fade');
            });

            $('#btnLogin').click(function () {
                $.ajax({
                    url: '/token',
                    method: 'POST',
                    contentType: 'application/json',
                    data: {
                        username: $('#txtUsername').val(),
                        password: $('#txtPassword').val(),
                        grant_type: 'password'
                    },
                    success: function (response) {
                        sessionStorage.setItem("accessToken", response.access_token);
                        window.location.href = "dashboard";
                    },
                    error: function (jqXHR) {
                        $('#divErrorText').text(jqXHR.responseText);
                    }
                });
            });
        });
    </script>

[Get Request] - DropDown List Jquery/Ajax with Entity framewrok - Select List

Click to expand!

HTML CODE for Dropdown

 <label class="col-12 col-sm-3 col-form-label text-left text-sm-right">Subject (Optional)</label>
 <select class="form-control" id="departmentsDropdown" name="departmentsDropdown"></select>

JS script

<script src="~/Scripts/jquery-3.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
    $(document).ready(function () {
        // Save the new user details
        App.init();

        $.ajax({
            type: "GET",
            url: "/api/subjects",
            data: "{}",
            success: function (data) {
                var s = '<option value="-1">Select a Subject</option>';
                for (var i = 0; i < data.length; i++) {
                    s += '<option value="' + data[i].SubjectId + '">' + data[i].Name + '</option>';
                    console.log(data[i].name + "------" + data[i].SubjectId);
                }
                $("#departmentsDropdown").html(s);
            }
        });
        });
    </script>

API Get Method

private ExamAcademyEntities db = new ExamAcademyEntities();

        // GET: api/Subjects
        public IQueryable<Subject> GetSubjects()
        {
            return db.Subjects;
        }

Projects:

-1 Jsonplaceholder Sample API call

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DotNet Projects API's Practice

.Net Web API Projects

.Net API

HTTP verbs

Docs

jsonpFormatter

-1 Install NuGet Package.

1.1-Package Manager Console.

2 Add NameSpace

3 Edit Config file

Methods

Default Methods

Methods for EntityFramework

Get

Get (int Id)

Get (int Id) [HttpResponseMessage]

Post ([FromBody] Employee employee)

Post ([FromBody] Employee employee) [HttpResponseMessage]

Delete (int id)

Delete (int id) [HttpResponseMessage]

Put (int id, [FromBody]Employee employee)

Put (int id, [FromBody]Employee employee) [HttpResponseMessage]

Method Customization

Query string parameters

Get(string gender = "All")

Retrieve Data from Multiple tables

Tabels:

Code

cross-origin requests

-1 Install NuGet Package.

1.1-Package Manager Console.

2 Include the following 2 lines of code in Register() method of WebApiConfig class in WebApiConfig.cs file in App_Start folder

Code Demo

cross-origin .Net core requests

1 Include the following 2 lines of code in Register() method of WebApiConfig class in WebApiConfig.cs file in App_Start folder

Three ways to config corse

Code Demo

Modify Token Response

1 Update the following code in CreateProperties() method class in ApplicationOAuthProvider.cs file in Provider folder

Code Demo

Request Url Post Method

Body

API Response

JS / Jquery / Ajax

[Get Request] - Display Data on HTML TABLE Jquery/Ajax with Entity framewrok

[Post Request] - Jquery/Ajax - Create User

[Post Request] - Jquery/Ajax - Login User

[Get Request] - DropDown List Jquery/Ajax with Entity framewrok - Select List

Projects:

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