2
我有一个应用程序使用异步查询执行将数据从MS SQL服务器移动到MySQL服务器;数据移动正常,但RunAllTasks()方法中的Task.WaitAll(tasks)调用永远不会完成。异步SQL查询执行 - Task.WaitAll(任务)永不完成
异步任务都遵循PumpLocsAsync()的模式,其中对MS SQL的调用通过BeginExecuteReader异步调用;当阅读器返回结果时,MySQL正常插入。
..
async Task PumpLocsAsync()
{
using (var conn = new SqlConnection(SqlConnStr))
using (var cn = new MySqlConnection(MysqlConnStr))
using (var cmd = new SqlCommand())
{
cmd.Connection = conn;
cmd.CommandText = "SELECT HERE";
conn.Open();
var handle = cmd.BeginExecuteReader();
await Task.Factory.FromAsync(handle, (ar) =>
{
var rdr = cmd.EndExecuteReader(ar);
var qry = @"INSERT HERE";
cn.Open();
using (var cmdm = new MySqlCommand(qry, cn))
{
cmdm.CommandTimeout = MysqlCmdtimeout;
<PARAM SETUP HERE>
<COLUMN MAPPING HERE>
while (RetryUtility.RetryMethod<bool>(() => rdr.Read(), 3, 1000))
{
<LOADING PARAMS WITH BITS HERE>
RetryUtility.RetryAction(() => cmdm.ExecuteNonQuery(), 3, 1000);
}
}
Console.WriteLine("Finished Locs!");
cn.Close();
});
conn.Close();
}
}
...
void RunAllTasks()
{
Task[] tasks = { PumpLocsAsync(), PumpPicsAsync() };
try
{
Task.WaitAll(tasks);
Console.WriteLine("Finished with all tasks...");
foreach (var task in tasks)
{
Console.WriteLine("Id: {0}, Status: {1}", task.Id, task.Status);
}
}
....
你的意思是这样的吗? var rdr = await Task.Factory.FromAsync(cmd.BeginExecuteReader() ,(Func)cmd.EndExecuteReader); –
dr3x
2012-04-22 22:04:00
这是_is_的答案... – MoonKnight 2012-04-22 22:29:34
@ dr3x,是的,你是对的。 – svick 2012-04-23 01:30:33