asynchronous

问题 I have a large scale C# solution with 40-ish modules. I'm trying to convert a service used solution-wide from synchronous to asynchronous. the problem is I can't find a way to do so without changing the signature of the method. I've tried wrapping said asynchronous desired operation with Task but that requires changing the method signature. I've tried changing the caller to block itself while the method is operating but that screwed my system pretty good because it's a very long calling-chain

问题 I have a large scale C# solution with 40-ish modules. I'm trying to convert a service used solution-wide from synchronous to asynchronous. the problem is I can't find a way to do so without changing the signature of the method. I've tried wrapping said asynchronous desired operation with Task but that requires changing the method signature. I've tried changing the caller to block itself while the method is operating but that screwed my system pretty good because it's a very long calling-chain

问题 I used Tornado to create a login page which works on synchronous method.Now I want to make it asynchronous. So what are the changes I should do to the following code: import tornado.ioloop import tornado.web import http import time class BaseHandler(tornado.web.RequestHandler): def get_current_user(self): return self.get_secure_cookie("user") class MainHandler(BaseHandler): def get(self): if not self.current_user: self.redirect("/login") return name = tornado.escape.xhtml_escape(self.current

问题 I used Tornado to create a login page which works on synchronous method.Now I want to make it asynchronous. So what are the changes I should do to the following code: import tornado.ioloop import tornado.web import http import time class BaseHandler(tornado.web.RequestHandler): def get_current_user(self): return self.get_secure_cookie("user") class MainHandler(BaseHandler): def get(self): if not self.current_user: self.redirect("/login") return name = tornado.escape.xhtml_escape(self.current

问题 For the following piece of code (.NET v4.0.30319) I am getting a null reference exception indicated below in the second continuation. Most interestingly this issue has only occurred in machines with 8GB RAM but other users have 16GB and more and they haven't reported any issue, and it is a very intermittent issue which leads me to suspect a garbage collection issue. The GetData() can be called multiple times so the first continuation of _businessObjectTask will only be called once as

问题 As best as I can, I opt for async all the way down. However, I am still stuck using ASP.NET Membership which isn't built for async. As a result my calls to methods like string[] GetRolesForUser() can't use async. In order to build roles properly I depend on data from various sources so I am using multiple tasks to fetch the data in parallel: public override string[] GetRolesForUser(string username) { ... Task.WaitAll(taskAccounts, taskContracts, taskOtherContracts, taskMoreContracts,

问题 I have an application that connects to a REST API using async methods. I have this set up using async/await pretty much everywhere that connects to the API, however I have a question and some strange behavior that I don't completely understand. What I want to do is simply return a license in certain scenarios when the program shuts down. This is initiated by a window closing event; the event handler is as follows: async void Window_Closing(object sender, System.ComponentModel.CancelEventArgs

问题 OperationSavDetails.js class OperationSavDetails extends Component { constructor(props) { super(props); this.state = { statusUpdateDropDownOpen: false, statusUpdateDropDownValue: "Mettre à jour le status de l'opération SAV" }; this.changeStatusUpdateDropDownValue = this.changeStatusUpdateDropDownValue.bind( this ); this.toggleStatusUpdateDropDown = this.toggleStatusUpdateDropDown.bind( this ); } changeStatusUpdateDropDownValue(e) { console.log("e.currentTarget.textContent"); console.log(e

问题 OperationSavDetails.js class OperationSavDetails extends Component { constructor(props) { super(props); this.state = { statusUpdateDropDownOpen: false, statusUpdateDropDownValue: "Mettre à jour le status de l'opération SAV" }; this.changeStatusUpdateDropDownValue = this.changeStatusUpdateDropDownValue.bind( this ); this.toggleStatusUpdateDropDown = this.toggleStatusUpdateDropDown.bind( this ); } changeStatusUpdateDropDownValue(e) { console.log("e.currentTarget.textContent"); console.log(e

问题 Why won't the program wait for the function to return the list before going to the print statement? I think it's because I made the forEach loop async but I need it to be async to get the newSummary which is a Future. Future syncToCloud() async{ final List<Map<String,dynamic>> _events = await events(); print(_events.length); } Future<List<Map<String, dynamic>>> events() async { List<Map<String, dynamic>> maps = await db.query('data'); List<Map<String, dynamic>> newMaps=[]; maps.forEach(