加载数据时异步和等待 [英] Async and Await When Loading Data

问题描述

 
 button1.KeyDown + = async（o，n）=> 
 {
 
 //这是一个搜索功能，用户会输入
 
 //文本框，然后在每个按键中，应用程序将连接
 
 //到数据库并搜索是否找到了已键入的数据
 
 //然后将其绑定到gridcontrol 
 
 var getData = Task.Run（（）=> ; Call_To_Database_NotAsync）; 
 var result = await getData; 
 gridcontrol.Datasource = result; 
} 
 

当用户快速键入并且与数据库的连接速度很慢时，网格控件是否可能根本不包含任何数据？

问候

 

解决方案

< blockquote>

我认为如果
Call_To_Database_NotAsync 或服务器端函数不支持多个并行执行，因此可以观察到不良影响。找到一种方法来取消过时的请求。

button1.KeyDown+=async(o,n)=>
{
//This is a search function, the user will type something on 
// a textbox then in every keypress, the application will connect
//to the database and search if the typed data has been found 
//then bind it to a gridcontrol
 var getData=Task.Run(()=> Call_To_Database_NotAsync);
 var result=await getData;
 gridcontrol.Datasource=result;
}

Is there a possibility that the grid control will contain no data at all when the user types fast and the connection to the database is slow?

Regards

 

解决方案

I think that if Call_To_Database_NotAsync or server-side functions are not designed to support multiple parallel executions, then it is possible to observe undesirable effects. Find a way to cancel the requests that are obsolete.

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