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

问题描述

Page_Load() 方法可以async 吗?我问，好像我已经声明过

protected void Page_Load()

一切正常加载.如果我把它声明为这样

protected async void Page_Load()

Page_Load() 断点没有命中，catch() 块也没有命中.

现在我试图将我的 Page_Load() 方法设置为 async 以便在页面完全呈现之前执行 3 个不同的存储过程.如果我没有将 Page_Load() 方法作为 async 我得到这个编译错误:

<块引用>

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();私有数据集 ds2 = 新数据集()；私有数据集 ds3 = 新数据集()；protected async void Page_Load(object sender, EventArgs e){如果 (!IsPostBack){var task1 = GetStoreInfo();var task2 = GetSalespersonInfo();var task3 = GetManagerInfo();等待 System.Threading.Tasks.Task.WhenAll(task1, task2, task3);填充全部();}

}

async System.Threading.Tasks.Task获取商店信息(){ds1 = RunStoredProcedureToReturnThisData();返回 ds1；}异步 System.Threading.Tasks.Task获取销售人员信息(){ds2 = RunStoredProcedureToReturnThisData();返回 ds2；}异步 System.Threading.Tasks.Task获取经理信息(){ds3 = RunStoredProcedureToReturnThisData();返回 ds3；}受保护的无效 PopulateAll(){//绑定不同的返回数据集}

解决方案

Scott Hanselman 拥有在 ASP.NET 生命周期事件中使用异步的魔法

http://www.hanselman.com/blog/TheMagicOfUsingAsynchronousMethodsInASPNET45PlusAnImportant.aspx.aspx/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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