C＃中的任务（异步/等待）循环挡住我的主线程？ [英] C# (async / await) loop in task block my main thread?

问题描述

private async Task<PortalODataContext> CallConnection(Connection connection)
    {
        bool cancel = false;
        connection.Connected = true;
        var task = getConnection(connection);

        while (!cancel && !task.IsCompleted)
        {
            Thread.Sleep(100);

            if (connection.Disconected)
            {
                cancel = true;
            }
        }

        return await task;
    }

这是我的功能，我在主线程中调用，像这样：

That is my function that I call on the main thread Like so :

PortalODataContext portalContext = await this.CallConnection(connectionOpen);

我是新来的异步和等待，所以我只是想弄清楚为什么我的任务CallConnection挡住我的主UI线程......你们能帮助我吗？

I am new to async and await so I'm just trying to figure out why My task"CallConnection" block my main UI thread ... can you guys help me ?

喔且有的getConnection

Ohh and there is the GetConnection :

private Task<PortalODataContext> getConnection(Connection connection)
    {            
        return Task.Factory.StartNew(() =>
        {
            try
            {
                var context = connection.ConnectToPortal();
                connection.ListTemplateLib = this.ShellModel.ConnectionManager.GetTemplateLibrarys(connection);
                connection.ListTemplateGrp = this.ShellModel.ConnectionManager.GetTemplateGroups(connection, connection.TemplateLibraryId);
                connection.ListTemplates = this.ShellModel.ConnectionManager.GetTemplates(connection, connection.TemplateGroupId);
                return context;
            }
            catch (Exception)
            {
                throw;
            }
       });

在此先感谢

推荐答案

Becasue的 Thread.sleep代码

异步/地等待着前两拆你的方法，而之后的await 。上半年你有一个 Thread.sleep代码，导致调用程序线程冻结。

async/await split your method in two, before and after the await. In the first half you have a Thread.Sleep, causing the caller thread to freeze.

使用：

private async Task<PortalODataContext> CallConnection(Connection connection)
{
    bool cancel = false;
    connection.Connected = true;
    var task = getConnection(connection);

    while (!cancel && !task.IsCompleted)
    {
        await Task.Delay(100);

        if (connection.Disconected)
        {
            cancel = true;
        }
    }

    return await task;
}

我不完全相信你正试图在这里实现的目标。

I am not completely sure what you are trying to achieve here.

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