insert whole list of data into sql database table in xamarin.android - list

Question

i'm trying to create an application where data in a list must be inserted into a database table at once. I made some research and found out that this is possible using user-defined table types where in c# a datatable is used and passed to a stored procedure that is executed. now my problem is that there are no data tables in Xamarin.Android. so I thought to use a list instead. my idea was to create a list in the application and pass it to the webservice method, and in my webservice method I receive the list and convert it to a datatable then pass it as a parameter to the stored procedure. I wrote the following codes:
in my webservice:
[WebMethod]
public bool insrt_dt(List<Class1> lst)
{
SqlParameter param;
SqlConnection conn = new SqlConnection(new DBConnection().ConnectionString);
DataTable dt = list_to_dt(lst);
SqlCommand cmd = new SqlCommand("Insert_Customers", conn);
cmd.CommandType = CommandType.StoredProcedure;
if (conn.State == System.Data.ConnectionState.Closed)
{
conn.Open();
}
param = new SqlParameter("#tblcustomers", dt);
param.Direction = ParameterDirection.Input;
param.DbType = DbType.String;
cmd.Parameters.Add(param);
cmd.CommandTimeout = 300;
int a=cmd.ExecuteNonQuery();
if (a > 0)
{
return true;
}
else return false;
}
}
Class1:
public class Class1
{
public int id { get; set; }
public string name { get; set; }
public string country { get; set; }
}
in my Xamarin.Android app
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
Button btn = FindViewById<Button>(Resource.Id.button1);
btn.Click += delegate
{
wr.WebService1 ws = new wr.WebService1();
wr.Class1 class1 = new wr.Class1();
List<wr.Class1> lst = new List<wr.Class1>(){
new wr.Class1() { id = 1, name = "hgf", country = "khg" },
new wr.Class1() { id = 2, name = "hgf", country = "khg"} };
ws.insrt_dt(lst);
ws.insrt_dtCompleted += Ws_insrt_dtCompleted;
};
}
private void Ws_insrt_dtCompleted(object sender, wr.insrt_dtCompletedEventArgs e)
{
bool l = e.Result;
if (l == true)
Toast.MakeText(this, "khh", ToastLength.Long).Show();
else
Toast.MakeText(this, "ijo'pioo", ToastLength.Long).Show();
}
}
but I keep getting this error:
Argument 1: cannot convert from 'System.Collections.Generic.List<app_dt.wr.Class1>' to 'app_dt.wr.Class1[]
so I used these lines instead
new wr.Class1() { id = 1, name = "hgf", country = "khg" },
new wr.Class1() { id = 2, name = "hgf", country = "khg"} };
wr.Class1[] class1s = lst.ToArray();
ws.insrt_dt(class1s);
now I don't get an error, but it doesn't work, I mean why does it say that the webservice method input must be an array and I've created it as a list. any suggestions for this?

Answer 1

As i know, Xamarin do not support System.Data.SqlClient. If you want to use the database for the Xamarin android project, you could use the SQLite.NET.
Install the package from the NuGet.
NuGet: sqlite-net-pcl https://www.nuget.org/packages/sqlite-net-pcl/
For the code sample about how to use the database in Xamarin, you could check the link below. https://learn.microsoft.com/en-us/xamarin/get-started/quickstarts/database?pivots=windows
For Xamarin.Android, you could check the sample code in the link below. https://learn.microsoft.com/en-us/xamarin/android/data-cloud/data-access/using-sqlite-orm