我有以下异步方法:
private async void ProcessSearch()
{
// get catalogs on first search
if (_invoiceTypes == null && _invoiceAccounts == null)
{
var confWcf = new Data.ConfigurationWCF();
_invoiceTypes = await confWcf.GetInvoiceTypesAsync(MainForm.State.Entity);
_invoiceAccounts = await confWcf.GetInvoiceAccountsAsync(MainForm.State.Entity);
confWcf.Dispose();
}
var seekWcf = new DataSeekWCF();
_ds = await seekWcf.SearchInvoiceAdminAsync(new Guid(cboEmployer.Value.ToString()), new Guid(cboGroup.Value.ToString()), txtSearchInvoiceNumber.Text, chkSearchLike.Checked, txtSearchFolio.Text, Convert.ToInt32(txtYear.Value));
seekWcf.Dispose();
if (_ds != null)
{
SetupInvoiceGrid();
}
}
我不想在_invoiceTypes,_invoiceAccounts和_ds完成之前执行SetupInvoiceGrid。
有任何线索吗?我做得对吗?我应该使用Task而不是等待吗?
我已经提出了这个似乎正常工作的代码,对我来说看起来不错,但不知道它是否正确:
private void btnSearch_Click(object sender, EventArgs e)
{
lock (lockObj)
{
if (_isBusy)
return;
else
_isBusy = true;
}
ShowPleaseWait(Translate("Searching data. Please wait..."));
if (_invoiceTypes == null && _invoiceAccounts == null)
{
var t = GetCatalogs();
t.ContinueWith(t2 =>
{
if (t.IsCompleted) ProcessSearch();
});
}
else
{
ProcessSearch();
}
}
private async Task GetCatalogs()
{
// get catalogs on first search
Data.ConfigurationWCF confWcf = new Data.ConfigurationWCF();
var task1 = confWcf.GetInvoiceTypesAsync(1);
var task2 = confWcf.GetInvoiceAccountsAsync(1);
confWcf.Dispose();
await Task.WhenAll(task1, task2);
_invoiceTypes = task1.Result;
_invoiceAccounts = task2.Result;
if (_invoiceTypes != null)
{
cboInvoiceType.DataSource = _invoiceTypes.Tables["invoice_types"];
cboInvoiceType.DisplayMember = "description";
cboInvoiceType.ValueMember = "code";
}
}
private async void ProcessSearch()
{
var seekWcf = new Data.SeekWCF();
_ds = await seekWcf.SearchInvoiceAdminAsync(new Guid(cboEmployer.Value.ToString()), new Guid(cboGroup.Value.ToString()), txtSearchInvoiceNumber.Text, chkSearchLike.Checked, txtSearchFolio.Text, Convert.ToInt32(txtYear.Value));
seekWcf.Dispose();
if (_ds != null)
{
SetupInvoiceGrid();
}
HidePleaseWait();
}
答案 0 :(得分:3)
我回答了关于如何处理ProcessSearchAsync
本身here完成的原始(?)问题。
要并行运行任务(如评论中所述),这里修改了代码,由于invoiceTypes == null
和_invoiceAccounts == null
检查,它会变得有点复杂。请注意下面实现检查的方式稍微改变了逻辑(以前只有当_invoiceTypes和_invoiceAccounts都为null时,它才进行WCF调用 - 如果只有其中一个为null,那么该怎么办?):
private async Task ProcessSearchAsync()
{
Data.ConfigurationWCF confWcf = new Data.ConfigurationWCF();
Task</*typeof _invoiceTypes*/> t1;
Task</*typeof _invoiceAccounts*/> t2;
if (_invoiceTypes == null)
t1 = confWcf.GetInvoiceTypesAsync(MainForm.State.Entity);
else
{
var tsc1 = new TaskCompletionSource</*typeof _invoiceTypes*/>();
t1 = tsc1.Task;
tsc1.SetResult(_invoiceTypes);
}
if ( _invoiceAccounts == null )
t2 = confWcf.GetInvoiceAccountsAsync(MainForm.State.Entity);
else
{
var tsc2 = new TaskCompletionSource</*typeof _invoiceAccounts*/>();
t2 = tsc2.Task;
tsc2.SetResult(_invoiceAccounts);
}
DataSeekWCF seekWcf = new DataSeekWCF();
Task</*typeof _ds*/> t3 = seekWcf.SearchInvoiceAdminAsync(new Guid(cboEmployer.Value.ToString()), new Guid(cboGroup.Value.ToString()), txtSearchInvoiceNumber.Text, chkSearchLike.Checked, txtSearchFolio.Text, Convert.ToInt32(txtYear.Value));
await Task.WhenAll(new Task[] {t1, t2, t3});
_invoiceTypes = t1.Result;
_invoiceAccounts = t2.Result;
ds = t3.Result;
if (_ds != null)
{
SetupInvoiceGrid();
}
confWcf.Dispose();
seekWcf.Dispose();
}
答案 1 :(得分:0)
对你所拥有的东西进行微小改动就能做到你想要的。你可以开始新的任务,然后做其他的事情,然后在你继续之前等待。正如@Noseratio所指出的那样,下面的这个片段不是生产就绪的,因为我没有检查错误条件(如null
引用等)。关键是你可以简洁而优雅地并行完成这些工作,而不必使用大量的Tasks API。我提出的一项值得指出的调整是,您希望将调用移至Dispose
进入延续(即,在所有await
之后),因为如果您在调用后立即尝试Dispose
*异步方法你很有可能在获得响应的过程中中断你的WCF客户端,而awaits
可能最终会抛出异常(我没有抓到)。
private async void ProcessSearchAsync()
{
Data.ConfigurationWCF confWcf = new Data.ConfigurationWCF();
Task</*typeof _invoiceTypes*/> t1;
Task</*typeof _invoiceAccounts*/> t2;
// get catalogs on first search
if (_invoiceTypes == null && _invoiceAccounts == null)
{
t1 = confWcf.GetInvoiceTypesAsync(MainForm.State.Entity);
t2 = confWcf.GetInvoiceAccountsAsync(MainForm.State.Entity);
}
DataSeekWCF seekWcf = new DataSeekWCF();
Task</*typeof _ds*/> t3 = seekWcf.SearchInvoiceAdminAsync(new Guid(cboEmployer.Value.ToString()), new Guid(cboGroup.Value.ToString()), txtSearchInvoiceNumber.Text, chkSearchLike.Checked, txtSearchFolio.Text, Convert.ToInt32(txtYear.Value));
_invoiceTypes = await t1;
_invoiceAccounts = await t2;
_ds = await t3;
if (_ds != null)
{
SetupInvoiceGrid();
}
confWcf.Dispose();
seekWcf.Dispose();
}