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[英]Powershell/C# Streams.Progress.DataAdded EventHandler in C# not working as expected
[英]Subscribing to powershell progress in c# not working
I'm writing a C# GUI program that uses System.Management.Automation to execute powershell commands on an instance created at runtime, I need it to be a persistent powershell instance so I can send multiple commands and collect the output at runtime. 這按預期工作,但我在訂閱進度事件時遇到了一些問題。 它僅在我輸入錯誤命令並寫入進度已完成 -1% 時觸發。
當我輸入正確的命令時,它根本不會觸發。 錯誤和 output 事件正常工作,所以我不確定出了什么問題。
我發現另外兩個有類似的問題,但他們的解決方案對我不起作用,我將它們鏈接在下面。 到目前為止,這是我使用失敗的代碼。
public class CodeHandler {
public static PowerShell psInstance;
public void init() {
//Create powershell instance
psInstance = PowerShell.Create();
}
public async Task < string > ExecutePowershellCommand(string script) {
psInstance.AddScript(script);
psInstance.AddCommand("Out-String");
PSDataCollection < PSObject > outputCollection = new PSDataCollection < PSObject > ();
outputCollection.DataAdded += outputCollection_DataAdded;
//The Part I Can't Get To Work
psInstance.Streams.Progress.DataAdded += (sender, eventargs) => {
PSDataCollection < ProgressRecord > progressRecords = (PSDataCollection < ProgressRecord > ) sender;
Console.WriteLine("!Progress is {0} percent complete", progressRecords[eventargs.Index].PercentComplete);
};
psInstance.Streams.Error.DataAdded += Error_DataAdded;
IAsyncResult result = psInstance.BeginInvoke < PSObject, PSObject > (null, outputCollection);
while (!result.IsCompleted) {
Console.WriteLine("Waiting for pipeline to finish...");
await Task.Delay(100);
}
PSInvocationState state = psInstance.InvocationStateInfo.State;
Console.WriteLine("Execution has stopped. The pipeline state: " + state);
if (state != PSInvocationState.Completed)
return string.Empty;
StringBuilder stringBuilder = new StringBuilder();
foreach(PSObject outputItem in outputCollection) {
stringBuilder.AppendLine(outputItem.BaseObject.ToString());
Console.WriteLine(outputItem.BaseObject.ToString());
}
return stringBuilder.ToString();
}
}
參考:
添加psInstance.EndInvoke(result);
如下所示:
...
IAsyncResult result = psInstance.BeginInvoke < PSObject, PSObject > (null, outputCollection);
while (!result.IsCompleted) {
Console.WriteLine("Waiting for pipeline to finish...");
await Task.Delay(100);
}
psInstance.EndInvoke(result);
...
您的腳本需要使用Write-Progress
示例腳本
# Use Get-Command to get list of commands and store them in the $cmds variable.
$cmds = Get-Command
# Pipe the events to the ForEach-Object cmdlet.
$cmds | ForEach-Object -Begin {
# In the Begin block, use Clear-Host to clear the screen.
Clear-Host
# Set the $i counter variable to zero.
$i = 0
# Set the $out variable to a empty string.
$out = ""
} -Process {
# get name
# Append to the out variable.
# $out=$out + $_
write-output ($_.Name + " " + $_.Version)
# Increment the $i counter variable which is used to create the progress bar.
$i = $i+1
# Use Write-Progress to output a progress bar.
# The Activity and Status parameters create the first and second lines of the progress bar heading, respectively.
Write-Progress -Activity "Searching Commands" -Status "Progress:" -PercentComplete ($i/$cmds.count*100)
} -End {
# Display using the out variable.
# $out
}
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