public async Task RollbackAsync()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: RollbackAsync(*)
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
KeyFactory keyFactory = db.CreateKeyFactory("message");
// Dispose automatically rolls back an uncommitted transaction synchronously.
// To roll back asynchronously,
bool committed = false;
DatastoreTransaction transaction = await db.BeginTransactionAsync();
try
{
Entity message = new Entity
{
Key = keyFactory.CreateIncompleteKey(),
["text"] = "Hello",
};
// This adds the entity to a collection in memory: nothing
// is sent to the server.
db.Insert(message);
// Attempt to commit the transaction asynchronously.
await transaction.CommitAsync();
committed = true;
}
finally
{
if (!committed)
{
// Roll back asynchronously if anything failed.
await transaction.RollbackAsync();
}
}
// End snippet
}