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Evaluate Json in WPF

09.08.2018 (👁389)


 

Task:

I would like to evaluate a Json return from a website in WPF.

 

Solution in C #, wpf:

//< convert to array >

        JsonObject jsonDownload = JsonObject.Parse(sDownload_as_String);

        JsonValue jsonResponse = jsonDownload["response"as JsonValue;

        JsonArray jsonResonseArray = jsonResponse.GetArray();

        //</ convert to array >

        

        //----< @Loop: Json-Rows >----

        foreach (var jsonRow in jsonResonseArray)

        {

            //----<  Json_Row >----

            JsonObject jsonObject = jsonRow.GetObject();

 

            //< values >

            string sID = jsonObject["id"].GetString();

            string sTitle = jsonObject["name"].GetString();

            //</ values >

..

}

 

 

 

WPF requires Windows.Data.Json (Microsoft)

By default you can integrate json via windows.data.json.

using Windows.Data.Json;        //*JsonArray

 

Translate a json download into values

Example of a Json results page:

[Lnk "https://www.contractor.de/api/?action=getJobsList&type=undefined&keyword" /] =

"success":true,"response":[{"id":"6134","name":"Teilprojektleiter (m\/w) SAP Rollout f\u00fcr 3 Tage\/Woche","place":"N\u00fcrnberg\/Kitzingen","start":"Okto….

 

 

 

In the debugger you can see the values, which are loaded at runtime.

/

 

 

?

Name

Value

Type

jsonDownload

null

Windows.Data.Json.JsonObject

jsonDownload["response"]

{[{"id":"6134","name":"Teilprojektleiter (m/w) SAP Rollout für 3 Tage/Woche","place":"Nürnberg/Kitzingen","start":"Oktober 2018","dur":"12 Monate+","link":"https://goo.gl/6Exg23"},{"id":"6126","name":"Senior Mobile Developer (m/w) Android & iOS","place":"Raum München","start":"September","dur":"4 Monate+","link":"https://goo.gl/EvkQnA"},{"id":"6125","name":"Solution Architekt (m/w) Microsoft","place":"München","start":"asap","dur":"4 Monate","link":"https://goo.gl/w5UY7Z"},{"i..

Windows.Data.Json.IJsonValue {Windows.Data.Json.JsonValue}

jsonRow

{{"id":"6134","name":"Teilprojektleiter (m/w) SAP Rollout für 3 Tage/Woche","place":"Nürnberg/Kitzingen","start":"Oktober 2018","dur":"12 Monate+","link":"https://goo.gl/6Exg23"}}

Windows.Data.Json.IJsonValue {Windows.Data.Json.JsonValue}

jsonObject["id"]

{"6134"}

Windows.Data.Json.IJsonValue {Windows.Data.Json.JsonValue}

jsonObject["id"].GetString()

"6134"

string

sTitle

"Teilprojektleiter (m/w) SAP Rollout für 3 Tage/Woche"

string

 

 

 

Complete code in C #

public static async Task<bool> Scan_Json(string sURL)

{

    //--------< Scrape_List() >--------

 

    app.URL = sURL;

    //Uri baseUrl = new Uri(sURL);

 

    if (app.Check_Stop == truereturn false;

 

    string sPage = sURL; //baseUrl.Query;

    clsSys.fx_Log("--< List: " + sPage + " >--");

 

    //< download >

    string sDownload_as_String = await clsWebReader.Web_Get_Download_as_String(sURL);

    if (sDownload_as_String == nullreturn false;

    //</ download >

 

    try

    {

        //------< Get Values as Json-Array >------

        //< convert to array >

        JsonObject jsonDownload = JsonObject.Parse(sDownload_as_String);

        JsonValue jsonResponse = jsonDownload["response"as JsonValue;

        JsonArray jsonResonseArray = jsonResponse.GetArray();

        //</ convert to array >

        

        //----< @Loop: Json-Rows >----

        foreach (var jsonRow in jsonResonseArray)

        {

            //----<  Json_Row >----

            JsonObject jsonObject = jsonRow.GetObject();

 

            //< values >

            string sID = jsonObject["id"].GetString();

            string sTitle = jsonObject["name"].GetString();

            //</ values >

 

            string sURL_Detail = app_settings.scan_List_Json_URL_Base + sID;

            

            //< correct >

            //sTitle = clsText.Encode(sTitle);

            //</ correct >

 

            //< add/update URL >

            clsDB.Add_or_Update_Record_from_List(sURL_Detail, sTitle);

            //</ add/update URL >

 

            //< print >

            clsSys.fx_Log(sTitle);

            //</ print >

 

            //----</  Json_Row >----

        }

        //----</ @Loop: Json-Rows >----

        //------</ Get Values as Json-Array >------

    }

    catch (Exception ex)

    {

        clsSys.fx_Error_Log(ex.Message);

        

    }

    

 

    clsSys.fx_Log("--</ List: " + sPage + " >--");

    clsSys.fx_Log("");

 

 

    

 

    //< out >

    return true;

    //</ out >

    //--------</ Scrape_List() >--------

}