Если я правильно вас понимаю, вы сохраняете токен обновления в базе данных и хотите использовать его позже для доступа к API.
Все, что вам нужно сделать, это сохранить токен обновления только затем, создав собственную реализацию idatastore для его загрузки. В настоящее время вы используете filedatastore, который будет искать его в файле, хранящемся в% appdata%
У меня есть несколько примеров здесь хранилища базы данных , но вот пример для структуры сущностей, так как вы еще не сказали, какую базу данных вы используете.
using Google.Apis.Json;
using Google.Apis.Util.Store;
using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
namespace GoogleAuthDataStores
{
public class GoogleUserCredential
{
[Key]
public int ID { get; set; }
[Required, Index(IsUnique = true), StringLength(500)]
public string Key { get; set; }
[Required]
public string Credentials { get; set; }
}
internal class EntityFrameworkDataStore : DbContext, IDataStore
{
public DbSet<GoogleUserCredential> GoogleUserCredentials { get; set; }
/// <summary>The string used to open the connection.</summary>
public virtual string ConnectionString { get; set; }
/// <summary>
/// Creates a new table in the data base if the Users table does not exist within the database used in the connectionstring.
/// </summary>
/// <param name="connectionString">The string used to open the connection.</param>
public EntityFrameworkDataStore(string connectionString) : base(connectionString)
{
ConnectionString = connectionString;
}
/// <summary>
/// Stores the given value for the given key. It creates a new row in the database with the user id of
/// (primary key <see cref="GenerateStoredKey"/>) in <see cref="GoogleUserCredentials"/>.
/// </summary>
/// <typeparam name="T">The type to store in the data store.</typeparam>
/// <param name="key">The key.</param>
/// <param name="value">The value to store in the data store.</param>
Task IDataStore.StoreAsync<T>(string key, T value)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentException("Key MUST have a value");
}
var serialized = NewtonsoftJsonSerializer.Instance.Serialize(value);
save(GenerateStoredKey(key), serialized);
return Task.Delay(0);
}
/// <summary>
/// Deletes the given key. It deletes the <see cref="GenerateStoredKey"/> row in
/// <see cref="GoogleUserCredentials"/>.
/// </summary>
/// <param name="key">The key to delete from the data store.</param>
Task IDataStore.DeleteAsync<T>(string key)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentException("Key MUST have a value");
}
try
{
var hold = GoogleUserCredentials.Where(a => a.Key == key).FirstOrDefault();
GoogleUserCredentials.Remove(hold);
SaveChangesAsync();
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception("Failed to delete credentials", ex);
}
return Task.Delay(0);
}
/// <summary>
/// Returns the stored value for the given key or <c>null</c> if the matching row (<see cref="GenerateStoredKey"/>
/// in <see cref="GoogleUserCredentials"/> doesn't exist.
/// </summary>
/// <typeparam name="T">The type to retrieve.</typeparam>
/// <param name="key">The key to retrieve from the data store.</param>
/// <returns>The stored object.</returns>
Task<T> IDataStore.GetAsync<T>(string key)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentException("Key MUST have a value");
}
TaskCompletionSource<T> tcs = new TaskCompletionSource<T>();
var user = GetUserByKey(GenerateStoredKey(key));
if (user != null)
{
try
{
tcs.SetResult(NewtonsoftJsonSerializer.Instance.Deserialize<T>(user.Credentials));
}
catch (Exception ex)
{
tcs.SetException(ex);
}
}
else
{
tcs.SetResult(default(T));
}
return tcs.Task;
}
/// <summary>
/// Clears all values in the data store. This method deletes all files in <see cref="GoogleUserCredentials"/>.
/// </summary>
Task IDataStore.ClearAsync()
{
try
{
foreach (var item in GoogleUserCredentials)
{
GoogleUserCredentials.Remove(item);
}
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception("Failed to clear credentials", ex);
}
return Task.Delay(0);
}
/// <summary>
/// Checks if the user exists <see cref="GenerateStoredKey"/>.
/// </summary>
private GoogleUserCredential GetUserByKey(string key)
{
try
{
var user = GoogleUserCredentials.Where(a => a.Key == key).FirstOrDefault();
if (user != null)
return user;
return null;
}
catch (System.Data.SqlClient.SqlException)
{
return null;
}
}
/// <summary>
/// Save the credentials. If the user <see cref="GenerateStoredKey"/> does not exists we insert it other wise we will do an update.
/// </summary>
/// <param name="key"></param>
/// <param name="serialized"></param>
private void save(string key, string serialized)
{
try
{
var user = GoogleUserCredentials.Where(a => a.Key == key).FirstOrDefault();
if (user == null)
{
var hold = new GoogleUserCredential { Key = key, Credentials = serialized };
GoogleUserCredentials.Add(hold);
}
else
{
var aUser = this.GoogleUserCredentials.Where(a => a.Key == key).FirstOrDefault();
aUser.Credentials = serialized;
}
SaveChanges();
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>Creates a unique stored key based on the key and the current project name.</summary>
/// <param name="key">The object key.</param>
public static string GenerateStoredKey(string key)
{
return string.Format("{0}-{1}", Assembly.GetCallingAssembly().GetName().Name, key);
}
}
}