private static async Task ReturnInfoTransaction(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
// [START fs_return_info_transaction]
DocumentReference cityRef = db.Collection("cities").Document("SF");
bool transactionResult = await db.RunTransactionAsync(async transaction =>
{
DocumentSnapshot snapshot = await transaction.GetDocumentSnapshotAsync(cityRef);
long newPopulation = snapshot.GetField <long>("Population") + 1;
if (newPopulation <= 1000000)
{
Dictionary <FieldPath, object> updates = new Dictionary <FieldPath, object>
{
{ new FieldPath("Population"), newPopulation }
};
transaction.Update(cityRef, updates);
return(true);
}
else
{
return(false);
}
});
if (transactionResult)
{
Console.WriteLine("Population updated successfully.");
}
else
{
Console.WriteLine("Sorry! Population is too big.");
}
// [END fs_return_info_transaction]
}
private static async Task RunSimpleTransaction(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
// [START fs_run_simple_transaction]
DocumentReference cityRef = db.Collection("cities").Document("SF");
await db.RunTransactionAsync(async transaction =>
{
DocumentSnapshot snapshot = await transaction.GetDocumentSnapshotAsync(cityRef);
long newPopulation = snapshot.GetField <long>("Population") + 1;
Dictionary <FieldPath, object> updates = new Dictionary <FieldPath, object>
{
{ new FieldPath("Population"), newPopulation }
};
transaction.Update(cityRef, updates);
});
// [END fs_run_simple_transaction]
Console.WriteLine("Ran a simple transaction to update the population field in the SF document in the cities collection.");
}