运行异步方法

Question

我试图在Powershell中异步运行一些自定义代码。 以下尝试在后台线程中检查更新：

Function CheckUpdates($manager)
{
    . "$PSScriptRoot\..\commands\upgradecmd.ps1";

    $upgradeCmd = New-Object UpgradeCmd -ArgumentList $manager;
    [bool]$upgradesAvailable = $false;

    try
    {
        $Global:silentmode = $true;

        $upgradeCmd.preview = $true;

        Start-Job -ArgumentList $upgradeCmd -ScriptBlock { param($upgradeCmd) $upgradeCmd.Run(); };

        Get-Job | Receive-Job;

        $upgradesAvailable = $upgradeCmd.upgradesAvailable;
    }
    finally
    {
        $Global:silentmode = $false;
    }

    if ($upgradesAvailable)
    {
        WriteWarning "Upgrades detected.";
        WriteWarning "Please, run the upgrade command to update your Everbot installation.";
    }
}

问题在于，在作业内部（在ScriptBlock中 ），PS无法识别有关我的自定义“ Run（）”方法的任何内容，因此它不知道如何调用它。 我试图使用-InitializationScript参数在作业中“包含”该类，但收效甚微。

在网上搜索后，似乎可以使用PS Jobs来完成此操作，PS中没有线程处理或类似“异步”之类的东西。 关键是我只想异步运行PS代码中某些类的方法。

Answer 1

为什么不在脚本块中加点源？

Function CheckUpdates($manager)
{
    try
    {
        $Global:silentmode = $true

        $Scriptblock = {
            param($manager)
            . "<absolutepath>\upgradecmd.ps1"; #better to replace this with absolute path
            $upgradeCmd = New-Object UpgradeCmd -ArgumentList $manager;
            [bool]$upgradesAvailable = $false
            $upgradeCmd.preview = $true
            $upgradeCmd.Run()
            $upgradesAvailable = $upgradeCmd.upgradesAvailable;

            Return $upgradesAvailable
        }
        Start-Job -ArgumentList $manager -ScriptBlock $Scriptblock
        $upgradesAvailable = @(Get-Job | Wait-Job | Receive-Job) #This will probably not be so cut and dry but you can modify your code based on the return value
    }
    finally
    {
        $Global:silentmode = $false;
    }

    if ($upgradesAvailable)
    {
        WriteWarning "Upgrades detected.";
        WriteWarning "Please, run the upgrade command to update your Everbot installation.";
    }
}

在接收之前，我还添加了一个“ Wait-Job ，因此您的脚本将等待作业完成。