Jak pracovat s PowerShellem v C#

Tento článek jsem se rozhodl napsat protože věci jsou složitější než se mohou zdát.

Jako první je nutno si nainstalovat nuget Microsoft.PowerShell.SDK.

Vytvořte si objekt PowerShell

var ps = PowerShell.Create();

1	var ps = PowerShell.Create();

Vložte co se má volat:

ps.AddScript($"Set-Location -Path '{wd}'");
ps.AddScript(".\msedgedriver.exe -v");

1 2	ps.AddScript($"Set-Location -Path '{wd}'"); ps.AddScript(".\msedgedriver.exe -v");

Zavolejte ps.Invoke nebo ps.InvokeAsync

Získejte výsledky, na to jsem si napsal třídu co vkládám do potřebných projektů přes snippet ve Visual Studio:

namespace SunamoSelenium;

using SunamoSelenium.Extensions;
using System.Management.Automation;
using System.Text;

public class PsOutput
{
    public static async Task<List<string>> InvokeAsync(PowerShell ps)
    {
        var output = await ps.InvokeAsync();

        List<string> result;

        if (ps.HadErrors)
        {
            result = PsOutput.ProcessErrorRecords(ps.Streams.Error);
        }
        else
        {
            result = PsOutput.ProcessPSObjects(output);
        }

        return result;
    }

    public static List<string> ProcessErrorRecords(PSDataCollection<ErrorRecord> errors)
    {
        List<string> result = new List<string>();

        StringBuilder sb = new();

        foreach (var item in errors)
        {
            AddErrorRecord(sb, item);

            result.Add(sb.ToString());
        }

        return result;
    }

    private static void AddErrorRecord(StringBuilder sb, ErrorRecord e)
    {
        sb.Clear();

        if (e == null) return;

        if (e.ErrorDetails != null) sb.AppendLine(e.ErrorDetails.Message);

        sb.AppendLine(e.Exception.GetAllMessages());
    }

    public static List<string> ProcessPSObjects(ICollection<PSObject> pso)
    {
        var output = new List<string>();

        foreach (var item in pso)
            if (item != null)
                output.Add(item.ToString().ToUnixLineEnding());

        return output;
    }
}

namespace SunamoSelenium;

using SunamoSelenium.Extensions;

using System.Management.Automation;

using System.Text;

public class PsOutput

{

public static async Task<List<string>> InvokeAsync(PowerShell ps)

{

var output = await ps.InvokeAsync();

List<string> result;

if (ps.HadErrors)

{

result = PsOutput.ProcessErrorRecords(ps.Streams.Error);

}

else

{

result = PsOutput.ProcessPSObjects(output);

}

return result;

}

public static List<string> ProcessErrorRecords(PSDataCollection<ErrorRecord> errors)

{

List<string> result = new List<string>();

StringBuilder sb = new();

foreach (var item in errors)

{

AddErrorRecord(sb, item);

result.Add(sb.ToString());

}

return result;

}

private static void AddErrorRecord(StringBuilder sb, ErrorRecord e)

{

sb.Clear();

if (e == null) return;

if (e.ErrorDetails != null) sb.AppendLine(e.ErrorDetails.Message);

sb.AppendLine(e.Exception.GetAllMessages());

}

public static List<string> ProcessPSObjects(ICollection<PSObject> pso)

{

var output = new List<string>();

foreach (var item in pso)

if (item != null)

output.Add(item.ToString().ToUnixLineEnding());

return output;

}

Stačí zavolat jen jednu metodu podle ps.HadErrors. S tím souvisí druhá věc, pro příkazy které můžou vrátit chybu se vyplatí dělat vlastní PowerShell objekt. Jde o to že když vložíte 2 příkazy jako třeba já zde:

ps.AddScript(".\\msedgedriver.exe -v");
ps.AddScript("edgedriver -v");

1 2	ps.AddScript(".\\msedgedriver.exe -v"); ps.AddScript("edgedriver -v");

a druhý selže, nevrátí se výsledek ani toho prvního!

Ještě bych se mohl rozepsat o rozdílu mezi AddScript a AddCommand ale o tom někdy příště.

Ve výsledku to může vypadat jako je v mém nuget balíčku SunamoSelenium:

public static async Task<IWebDriver?> InitDriver(ILogger logger, string pathToEdgeDriver)
{
    if (!File.Exists(pathToEdgeDriver))
    {
        logger.LogError($"File {pathToEdgeDriver} not found!");
        return null;
    }

    var ps = PowerShell.Create();
    var wd = Path.GetDirectoryName(pathToEdgeDriver);

    ps.AddScript($"Set-Location -Path '{wd}'");
    ps.AddScript(".\\msedgedriver.exe -v");

    PSDataCollection<PSObject> output = await ps.InvokeAsync();

    List<string> result;
    Version versionEdgeDriver;

    if (ps.HadErrors)
    {
        result = PsOutput.ProcessErrorRecords(ps.Streams.Error);
        return null;
    }
    else
    {
        result = PsOutput.ProcessPSObjects(output);
        // Microsoft Edge WebDriver 131.0.2903.48 (eb872b980f9ea5184cec7f71c2e6df8ac30265cc)
        var parts = result[0].Split(' ');
        var version = parts[3];

        versionEdgeDriver = Version.Parse(version);
    }

    ps = PowerShell.Create();
    ps.AddScript("where.exe msedge");
    var whereOutput = await PsOutput.InvokeAsync(ps);

    if (!File.Exists(whereOutput[0]))
    {
        logger.LogError("where.exe msedge failed: " + whereOutput[0]);
        return null;
    }

    ps = PowerShell.Create();
    ps.AddScript($"(Get-Item \"{whereOutput[0]}\").VersionInfo.FileVersion");
    var edgeVersionOutput = await PsOutput.InvokeAsync(ps);

    var versionEdge = Version.Parse(edgeVersionOutput[0]);

    if (versionEdge.Major != versionEdgeDriver.Major)
    {
        logger.LogError($"Version EdgeDriver {versionEdgeDriver} is different than version Edge {versionEdge}. Download new on https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/?form=MA13LH");
        return null;
    }
    else if (versionEdge.Major != versionEdgeDriver.Major)
    {
        logger.LogWarning($"Major version EdgeDriver {versionEdgeDriver.Major} is different than version Edge {versionEdge.Major}. Download new on https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/?form=MA13LH, if you want.");
    }

    EdgeOptions options = new();

    // toto tu je abych se vyhnul chybě disconnected: not connected to DevTools
    options.AddArguments(["--disable-dev-shm-usage", "--no-sandbox"]);

    var driver = new EdgeDriver(pathToEdgeDriver, options);
    driver.Manage().Window.Maximize();

    return driver;
}

public static async Task<IWebDriver?> InitDriver(ILogger logger, string pathToEdgeDriver)

{

if (!File.Exists(pathToEdgeDriver))

{

logger.LogError($"File {pathToEdgeDriver} not found!");

return null;

}

var ps = PowerShell.Create();

var wd = Path.GetDirectoryName(pathToEdgeDriver);

ps.AddScript($"Set-Location -Path '{wd}'");

ps.AddScript(".\\msedgedriver.exe -v");

PSDataCollection<PSObject> output = await ps.InvokeAsync();

List<string> result;

Version versionEdgeDriver;

if (ps.HadErrors)

{

result = PsOutput.ProcessErrorRecords(ps.Streams.Error);

return null;

}

else

{

result = PsOutput.ProcessPSObjects(output);

// Microsoft Edge WebDriver 131.0.2903.48 (eb872b980f9ea5184cec7f71c2e6df8ac30265cc)

var parts = result[0].Split(' ');

var version = parts[3];

versionEdgeDriver = Version.Parse(version);

}

ps = PowerShell.Create();

ps.AddScript("where.exe msedge");

var whereOutput = await PsOutput.InvokeAsync(ps);

if (!File.Exists(whereOutput[0]))

{

logger.LogError("where.exe msedge failed: " + whereOutput[0]);

return null;

}

ps = PowerShell.Create();

ps.AddScript($"(Get-Item \"{whereOutput[0]}\").VersionInfo.FileVersion");

var edgeVersionOutput = await PsOutput.InvokeAsync(ps);

var versionEdge = Version.Parse(edgeVersionOutput[0]);

if (versionEdge.Major != versionEdgeDriver.Major)

{

logger.LogError($"Version EdgeDriver {versionEdgeDriver} is different than version Edge {versionEdge}. Download new on https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/?form=MA13LH");

return null;

}

else if (versionEdge.Major != versionEdgeDriver.Major)

{

logger.LogWarning($"Major version EdgeDriver {versionEdgeDriver.Major} is different than version Edge {versionEdge.Major}. Download new on https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/?form=MA13LH, if you want.");

}

EdgeOptions options = new();

// toto tu je abych se vyhnul chybě disconnected: not connected to DevTools

options.AddArguments(["--disable-dev-shm-usage", "--no-sandbox"]);

var driver = new EdgeDriver(pathToEdgeDriver, options);

driver.Manage().Window.Maximize();

return driver;

}

Leave a Reply Cancel reply