Page_Load()是否可以异步 [英] Can Page_Load() Be Async

问题描述

Page_Load()方法可以是async吗?我问我是否已声明如此

protected void Page_Load()

一切都应加载.如果我这样声明

protected async void Page_Load()

Page_Load()断点未命中，catch()块也未命中.

现在，我试图将我的Page_Load()方法设置为async，以便在完全呈现页面之前执行3个不同的存储过程以完成操作.如果我没有Page_Load()方法作为async，则会收到此编译错误:

await运算符只能与异步方法一起使用.

我的代码就是这样.

private DataSet ds1 = new DataSet();
private DataSet ds2 = new DataSet();
private DataSet ds3 = new DataSet();

protected async void Page_Load(object sender, EventArgs e)
{
 if (!IsPostBack)
 {
    var task1 = GetStoreInfo();
    var task2 = GetSalespersonInfo();
    var task3 = GetManagerInfo();
    await System.Threading.Tasks.Task.WhenAll(task1, task2, task3);
    PopulateAll();
 }

}

async System.Threading.Tasks.Task<DataSet> GetStoreInfo()
{
  ds1 = RunStoredProcedureToReturnThisData();
  return ds1;
}

async System.Threading.Tasks.Task<DataSet> GetSalespersonInfo()
{
  ds2 = RunStoredProcedureToReturnThisData();
  return ds2;
}

async System.Threading.Tasks.Task<DataSet> GetManagerInfo()
{
  ds3 = RunStoredProcedureToReturnThisData();
  return ds3;
}

protected void PopulateAll()
{
  //Bind the different returned datasets
}

解决方案

Scott Hanselman可以将异步与ASP.NET生命周期事件一起使用

> http://www.hanselman.com/blog/TheMagicOfUsingAsynchronousMethodsInASPNET45PlusAnasp.x/p>

Can a Page_Load() method be async? I ask as if I have declared as such

protected void Page_Load()

Everything loads as it should. If I have it declared as such

protected async void Page_Load()

the Page_Load() breakpoint is not hit, nor does the catch() block get hit.

Now I am trying to set my Page_Load() method as async in order to have 3 different stored procedures execute to completion before the page is fully rendered. If I do not have my Page_Load() method as async I get this compile error:

The await operator can only be used with an async method.

My code is as such.

private DataSet ds1 = new DataSet();
private DataSet ds2 = new DataSet();
private DataSet ds3 = new DataSet();

protected async void Page_Load(object sender, EventArgs e)
{
 if (!IsPostBack)
 {
    var task1 = GetStoreInfo();
    var task2 = GetSalespersonInfo();
    var task3 = GetManagerInfo();
    await System.Threading.Tasks.Task.WhenAll(task1, task2, task3);
    PopulateAll();
 }

}

async System.Threading.Tasks.Task<DataSet> GetStoreInfo()
{
  ds1 = RunStoredProcedureToReturnThisData();
  return ds1;
}

async System.Threading.Tasks.Task<DataSet> GetSalespersonInfo()
{
  ds2 = RunStoredProcedureToReturnThisData();
  return ds2;
}

async System.Threading.Tasks.Task<DataSet> GetManagerInfo()
{
  ds3 = RunStoredProcedureToReturnThisData();
  return ds3;
}

protected void PopulateAll()
{
  //Bind the different returned datasets
}

解决方案

Scott Hanselman has the magic to use async with ASP.NET lifecycle events here

http://www.hanselman.com/blog/TheMagicOfUsingAsynchronousMethodsInASPNET45PlusAnImportantGotcha.aspx

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