How to update pin information on google map using xamarin - ios

Question

It is necessary to replace the direct connection to the database with API.
I use this code to directly connect to MySQL db and change pin information:
public async void DatabaseConnection(List<CustomPin> pins)
{
string ConnectionString = "server=192.168.0.1;uid=user;port=4444;pwd=pass;database=dbName;";
MySqlConnection Conn = new MySqlConnection(ConnectionString);
try
{
Conn.Open();
string query = "SELECT * FROM sel_alert_level s;";
MySqlCommand myCommand = new MySqlCommand(query, Conn);
MySqlDataReader myReader;
myReader = myCommand.ExecuteReader();
try
{
while (myReader.Read())
{
int codeNum = myReader.GetInt32(4);
int level = myReader.GetInt32(3);
int mapCode = myReader.GetInt32(0);
foreach (var item in pins)
{
if (item.CodeNum == codeNum)
{
item.AlertLevel = level;
item.CodeNum = codeNum;
item.MapCode = mapCode;
//await DisplayAlert("Alert", mapCode.ToString(), "ok");
}
}
//await DisplayAlert("Database Connection", "Connected .." + Environment.NewLine + myReader.GetInt32(0) + Environment.NewLine + myReader.GetString(1) + Environment.NewLine + myReader.GetString(2) + Environment.NewLine + myReader.GetInt32(3) + Environment.NewLine + myReader.GetInt32(4), "OK");
}
}
finally
{
myReader.Close();
Conn.Close();
}
}
catch (Exception ex)
{
await DisplayAlert("Database Connection", "Not Connected ..." + Environment.NewLine + ex.ToString(), "OK");
}
}
With this code I successfully update the pin information.
Now I create the same method with API Response and what to do the same like DatabaseConnection(); just try to update the information, but not work for me :(
public async void APIConnection(List<CustomPin> pins)
{
try
{
WaterBindingData waterData = await _restServiceData.GetWaterDataForecast(GenerateRequestUriStations(Constants.EndPoint), GenerateRequestUri(Constants.EndPoint));
foreach (var water in waterData.WaterStation.Stations)
{
foreach (var item in pins)
{
if (item.CodeNum == water.CodeNum)
{
item.AlertLevel = water.AlertLevelStation;
item.CodeNum = water.CodeNum;
item.MapCode = water.MapCode;
}
}
}
}
catch (Exception ex)
{
await DisplayAlert("Data Alert", "Error:" + Environment.NewLine + ex.ToString(), "OK");
}
}
I not have any errors here. waterData come with the data, but data not changed in the pins.. I don't know why...
And Now my information are not changed ..
MapCode and other variables not changed.
I call this two methods in the constructor like that:
DatabaseConnection(customMap.CustomPins);
APIConnection(customMap.CustomPins);
So... When I start the project I receive message like this:
/Applications/Visual Studio.app/Contents/Resources/lib/monodevelop/bin/MSBuild/Current/bin/Microsoft.Common.CurrentVersion.targets(5,5): Warning MSB3276: Found conflicts between different versions of the same dependent assembly. Please set the "AutoGenerateBindingRedirects" property to true in the project file. For more information, see http://go.microsoft.com/fwlink/?LinkId=294190. (MSB3276) (MaritsaTundzhaForecast.iOS)
And I check this link but I not have properties option, because I use mac. I have only options on the projects.
Is it possible that this does not change the content in the pins аnd what would be the reason it didn't work ?
I checked the if statement in the loop and she work:

Answer 1

Since it is an asynchronous method , I suggest you try to assign customMap.CustomPins in APIConnection method .
Something like that
//constructor
List<CustomPin> pins = xxxxx;
APIConnection(pins);
public async void APIConnection(List<CustomPin> pins)
{
try
{
WaterBindingData waterData = await _restServiceData.GetWaterDataForecast(GenerateRequestUriStations(Constants.EndPoint), GenerateRequestUri(Constants.EndPoint));
foreach (var water in waterData.WaterStation.Stations)
{
foreach (var item in pins)
{
if (item.CodeNum == water.CodeNum)
{
item.AlertLevel = water.AlertLevelStation;
item.CodeNum = water.CodeNum;
item.MapCode = water.MapCode;
}
}
}
customMap.CustomPins = pins; //assign the value in this line
}
catch (Exception ex)
{
await DisplayAlert("Data Alert", "Error:" + Environment.NewLine + ex.ToString(), "OK");
}
}