[英]WPF & PowerShell - Passing Variables from PS to C# or modifying value
我需要使用PowerShell執行驗證,並根據結果在WPF應用程序中執行操作。 我知道我可以從PowerShell修改TextBlocks,但是當我嘗試從PowerShell修改WPF變量的值時,沒有任何反應。
這是一個例子。
MainWindow.xaml:
<Window x:Class="Test.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:Test"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TextBlock x:Name="textBlock" HorizontalAlignment="Left" Margin="74,76,0,0" TextWrapping="Wrap" Text="false" VerticalAlignment="Top" Height="177" Width="371"/>
</Grid>
</Window>
MainWindow.xaml.cs:
using System;
using System.Windows;
using System.Windows.Controls;
using System.Management.Automation;
using System.Management.Automation.Runspaces;
using System.Text.RegularExpressions;
using System.IO;
namespace Test
{
public partial class MainWindow : Window
{
private bool exists = false;
public MainWindow()
{
InitializeComponent();
// Setup PowerShell Environment
Runspace runSpace = RunspaceFactory.CreateRunspace();
runSpace.ThreadOptions = PSThreadOptions.UseCurrentThread;
runSpace.Open();
runSpace.SessionStateProxy.SetVariable("exists", exists);
PowerShell ps = PowerShell.Create();
ps.Runspace = runSpace;
string check = "$exists = true";
ps.AddScript(check);
// Execute
ps.Invoke();
runSpace.Close();
if (exists == true)
{
textBlock.Text = "It is true!";
}
}
}
}
經過一些驗證后,如何在PowerShell中修改C#/ WPF變量? 那有可能嗎?
我不想為臨時變量創建隨機文本塊/標簽/文本框。
首先, exists
一個值類型。 要從PowerShell更新exists
,您必須通過引用PowerShell腳本來傳遞它。 我可能是錯的,但似乎不太可能。 即使有可能,我仍然不建議這樣做。 這樣的狀態看起來簡直是毛骨悚然。 我認為更好的方法是將要驗證的數據傳遞到PowerShell腳本,然后將驗證結果返回給C#。 您可以根據該結果在C#中修改變量狀態。
這是我在LinqPad中使用輸出運行的代碼的略微修改版本:
var exists = true;
Runspace runSpace = RunspaceFactory.CreateRunspace();
runSpace.ThreadOptions = PSThreadOptions.UseCurrentThread;
runSpace.Open();
PowerShell ps = PowerShell.Create();
ps.Runspace = runSpace;
string validation = @"
# Perform some validation.
# For the purposes of this demonstration I am going to pretend
# that validation failed and set 'result' to false.
$result = $false
# Return 'result'
$result
";
ps.AddScript(validation);
// Write the state of `exists` to the console before invoking PowerShell.
Console.WriteLine("exists: " + exists.ToString());
// Execute
var result = ps.Invoke();
// Update exists based on the result of the validation.
exists = bool.Parse(result[0].ToString());
// Or you can use 'GetVariable' to get the result back from PowerShell:
// exists = bool.Parse(runSpace.SessionStateProxy.GetVariable("result").ToString());
// Write the state to the console after invoking PowerShell.
Console.WriteLine("exists: " + exists.ToString());
這是寫入控制台的結果:
存在:真實
存在:錯誤
根據邁克的建議,我什至不必映射就可以從PS中獲取變量。 像這樣:
using System;
using System.Windows;
using System.Windows.Controls;
using System.Management.Automation;
using System.Management.Automation.Runspaces;
using System.Text.RegularExpressions;
using System.IO;
namespace Test
{
public partial class MainWindow : Window
{
public bool itExists = false;
public MainWindow()
{
InitializeComponent();
// Setup PowerShell Environment
Runspace runSpace = RunspaceFactory.CreateRunspace();
runSpace.ThreadOptions = PSThreadOptions.UseCurrentThread;
runSpace.Open();
PowerShell ps = PowerShell.Create();
ps.Runspace = runSpace;
string check = "$itExists = $TRUE";
ps.AddScript(check);
// Execute
ps.Invoke();
var result = runSpace.SessionStateProxy.PSVariable.GetValue("itExists").ToString();
runSpace.Close();
itExists = result.Equals("True");
if (itExists)
{
textBlock.Text = "It is true!";
}
}
}
}
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