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Send data from Windows 10 to Web API.

03.07.2018 (👁18440)


 

This code example shows how to attach data from a local Windows 10 client to an Asp.Net Core Web Api web server

A local Windows 10 UWP application sends data as a json format to the web api interface of the web server. There, the data is added to the SQL database

Shown is the HttpPost method for creating new data.

 

Functionality:

The client does the following:

Load data from SQlite local database and transfer it to Json. Then with a HttpClient and HttpPost send to the web server

 

The server does the following:

Under the HttpPost method, he takes over the request and loads the data from the request body. The data is transferred from Json to a record and stored.

 

Example code

Code in C #

Client = UWP App application in Windows 10

Server = Asp.Net Core MVC Api

 

Json, HttpPut, REST, Web Api, Sqlite, and SQL Server

 

 

API client

UWP client

SQLite, Json

 

 

    HttpClient client = await Create_HttpClient_with_UserToken();

            string IDDetail = "123abc";

            //< read webApi >

            //*httpPut /api/projects

            string sUrl_Api_Create = app_settings._Api_Server + "/api/projects";

            HttpResponseMessage httpResponseMessage = null;

            try

            {

                //< create Upload_Content >

                JsonObject jsonObject = new JsonObject();

                jsonObject["IDDetail"] = JsonValue.CreateStringValue(IDDetail);

                jsonObject["Title"] = JsonValue.CreateStringValue("this is a Title");

                StringContent string_to_Upload_Content = new StringContent(jsonObject.Stringify());

                //</ create Upload_Content >

 

                //< upload >

                //httpPost=Create

                httpResponseMessage = await client.PostAsync(sUrl_Api_Create, string_to_Upload_Content );

                //</ upload >

          ..

 

 

Screenshot when sending the data

Shows: The data is inserted from the SQLite database into the Json Object and sent

 

Web Server

Asp.Net Core Web API

 

 

//HttpPost URL=/api/projects  

//*Post=Create, Put=Update

[HttpPost]

public async Task<ActionResult> Create()

{

    //-------------< Create() >------------- 

    ..

    //--< Read UploadData >--

    StreamReader reader = new StreamReader(Request.Body);

    JObject jsonData = JObject.Parse(reader.ReadToEnd());

    string IDDetail = jsonData.GetValue("IDDetail").ToString();

    string sTitle = jsonData.GetValue("Title").ToString();

    //--</ Read UploadData >--

 

 

    //< Create Data >

    ProjectModel project = new ProjectModel();

 

    project.IDOwner = IDCurrent_User;

    project.Title = sTitle;

    project.DtCreated = DateTime.Now;

 

    //</ Create Data >

 

 

    //< add recordset >

    _dbContext.tbl_Projects.Add(project);      

    await _dbContext.SaveChangesAsync(true);

    //</ add recordset >

 

    //< out >

    //*output to client

    return Ok();

    //</ out >

    //-------------</ Create() >------------- 

}

 

 

 

ScreenShot on the web server Webapi when the data arrives.

The screenshot of the debugger shows that the data from the Request.Body can be read in a Json-Object and read there via key-pair

 

 

Complete code

Example, C #

 

Complete code of the transmission method in UWP

private async Task<bool> Api_Add_Projects()

{

    //--------< Api_Add_Projects() >--------

    if (optStop.IsChecked == truereturn false;

    fx_Log("--< API:Api_Add_Projects >--");

 

    //---------------< read_API_Data() >---------------

 

    HttpClient client = await Create_HttpClient_with_UserToken();

 

    //----< Check_to_local >----

    //< find record >

    string sSQL = "SELECT * FROM tbl_Details WHERE [IDProject_on_Server] IS NULL";

    SqliteDataReader dataReader = clsDB.Get_DataReader(sSQL);

    if (dataReader.HasRows == true)

    {

        while (dataReader.Read())

        {

            //---< NoMatch: Delete on Server >---

            string IDDetail = dataReader["IDDetail"].ToString();

            fx_Log("add Project IDDetail:" + IDDetail);

            //</ nomatch >

 

            //< read webApi >

            //*httpPut /api/projects

            string sUrl_Api_Create = app_settings._Api_Server + "/api/projects";

            HttpResponseMessage httpResponseMessage = null;

            try

            {

                //< create Upload_Content >

                JsonObject jsonObject = new JsonObject();

                jsonObject["IDDetail"] = JsonValue.CreateStringValue(IDDetail);

                jsonObject["Title"] = JsonValue.CreateStringValue("this is a Title");

                StringContent string_to_Upload_Content = new StringContent(jsonObject.Stringify());

                //</ create Upload_Content >

 

                //< upload >

                //httpPost=Create

                httpResponseMessage = await client.PostAsync(sUrl_Api_Create, string_to_Upload_Content );

                //</ upload >

                

                //< result >

                var NewID = httpResponseMessage.Content.ToString();

                //</ result >

 

                fx_Log("ok.Created ");

            }

            catch (Exception ex)

            {

 

                fx_Log("Error Delete byWebsite: " + ex.Message);

                //return;

            }

            //</ read webApi >

            //---</ NoMatch: Delete on Server >---

        }

    }

 

    //----</ @Loop: Projects_on_Server >----

    //----</ get Projects-List >----

    //---------------</ read_API_Data() >---------------

 

 

 

    fx_Log("--</ API:Api_Add_Projects >--");

    fx_Log("");

 

    return true;

 

    //--------</ Api_Add_Projects() >--------

}

 

 

 

Complete code of the web API interface on the server

 

 

//HttpPost URL=/api/projects  

//*Post=Create, Put=Update

[HttpPost]

public async Task<ActionResult> Create()

{

    //-------------< Create() >------------- 

    //< get UserClaim Info >

    //*get User from Token

    var userClaim_in_Token = HttpContext.User.Claims.Where(c => c.Type == ClaimsIdentity.DefaultNameClaimType).FirstOrDefault(); //User as Name

    if (userClaim_in_Token == null)

    {

        return null;

    }

    string sEmail = userClaim_in_Token.Value;

    //</ get UserClaim Info >

 

    //< check user >

    long IDCurrent_User = await Get_UserID(sEmail);

    //</ check user >

 

    //--< Read UploadData >--

    StreamReader reader = new StreamReader(Request.Body);

    JObject jsonData = JObject.Parse(reader.ReadToEnd());

    string IDDetail = jsonData.GetValue("IDDetail").ToString();

    string sTitle = jsonData.GetValue("Title").ToString();

    //--</ Read UploadData >--

 

 

    //< Create Data >

    ProjectModel project = new ProjectModel();

 

    project.IDOwner = IDCurrent_User;

    project.Title = sTitle;

    project.DtCreated = DateTime.Now;

    //</ Create Data >

 

 

    //< add recordset >

    _dbContext.tbl_Projects.Add(project);      

    //</ add recordset >

 

    //< save sqlserver >

    await _dbContext.SaveChangesAsync(true);

    //</ save sqlserver >

 

    //< out >

    //*output to client

    return Ok();

    //</ out >

    //-------------</ Create() >------------- 

}