c# - IronPython 作为 C# WPF VS 2015 的脚本语言

Question

我遇到了一些麻烦，希望你能帮忙解决!我一直在尝试在 sleep(500) 步骤中在 while 循环中更新此 grid.Width 参数。但是，当我在我的程序上点击运行脚本时，整个 GUI 都停止了。我已经尝试在不同的线程上运行脚本并使用 BackgroundWorker，但在脚本完成之前，它们仍然以两种方式阻止我的应用程序 GUI。你能看看下面的代码吗？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using System.IO;
using System.Threading;
using IronPython.Hosting;
using Microsoft.Scripting;
using Microsoft.Scripting.Hosting;

namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    string script;
    ScriptEngine engine;
    ScriptScope scope;
    Thread threadScript;

    public MainWindow()
    {
        InitializeComponent();

        engine = Python.CreateEngine();
        scope = engine.CreateScope();
        string variableName = "isto";
        object gridMier = gridScript;
        scope.SetVariable(variableName, gridMier);
    }

    public void rodarScript()
    {
        this.Dispatcher.Invoke((Action)(() =>
        {
            try
            {
                //PARTE PARA ADICIONAR BIBLIOTECAS BASICAS PARA DESENVOLVIMENTO COM OS SCRIPTS
                script = @"#Reference the WPF assemblies
import clr
clr.AddReferenceByName(""PresentationFramework, Version = 3.0.0.0, Culture =       neutral, PublicKeyToken = 31bf3856ad364e35"")
clr.AddReferenceByName(""PresentationCore, Version=3.0.0.0, Culture=neutral,     PublicKeyToken=31bf3856ad364e35"")
import System.Windows
def getMyObject():
    return isto

objeto = getMyObject()

#Atalhos de referencias para adicionar
Thickness = System.Windows.Thickness
from System.Threading.Thread import Sleep
Debug = System.Diagnostics.Debug";

                script = script + "\n" + textBoxScript.Text;
                var source = engine.CreateScriptSourceFromString(script, SourceCodeKind.Statements);
                //var compiled = source.Compile();
                //var result = compiled.Execute(scope);
                source.Execute(scope);
            }
            catch (Exception qualquerExcecaoEncontrada)
            {
                MessageBox.Show(qualquerExcecaoEncontrada.ToString(), "Scripting Test do Mier", MessageBoxButton.OK);
            }
        }));
    }

    private void buttonScript_Click(object sender, RoutedEventArgs e)
    {
        threadScript = new Thread(rodarScript);
        threadScript.Start();
    }
}
}

IronPython 中的代码示例 (textBoxScript.Text)

for num in range(1,100):
    objeto.Width = objeto.Width + 1
    Sleep(500)

这个在线程上运行的简单代码会阻塞我的整个 GUI 50 秒。任何帮助将不胜感激!

谢谢，卢卡斯。

Answer 1

创建一个单独的线程，然后将完整的内容放入 Dispatcher.Invoke 是没有意义的。因为您随后再次与 ui 线程同步(咆哮时间)。您应该只调用那些需要的东西(UI 访问)。首先从 rodarScript 中删除它，只将它用于 script = script + "\n"+ textBoxScript.Text;:

    public void rodarScript()
    {
        try
        {
            //PARTE PARA ADICIONAR BIBLIOTECAS BASICAS PARA DESENVOLVIMENTO COM OS SCRIPTS
            script = @"#...";

            this.Dispatcher.Invoke((Action)(() =>
            {
                script = script + "\n" + textBoxScript.Text;
            }));

            var source = engine.CreateScriptSourceFromString(script, SourceCodeKind.Statements);
            //var compiled = source.Compile();
            //var result = compiled.Execute(scope);
            source.Execute(scope);
        }
        catch (Exception qualquerExcecaoEncontrada)
        {
            MessageBox.Show(qualquerExcecaoEncontrada.ToString(), "Scripting Test do Mier", MessageBoxButton.OK);
        }
    }

(已删除 IP 代码)。

然后添加一些简单的方法，它接受 PythonFunction 的实例并将其添加为变量，如下所示:

public void ExecuteInUI(object obj)
{
    this.Dispatcher.BeginInvoke((Action)(() =>
    {
        var op = engine.CreateOperations(scope);
        op.Invoke(obj);
    }));
}

添加为变量:

scope.SetVariable("execute_in_ui", new Action<object>(ExecuteInUI));

然后你必须稍微修改一下你的 Python 代码，因为你只想在访问 ui 时使用 BeginInvoke:

def inc_width():
    objeto.Width = objeto.Width + 1

for num in range(1,100):
    execute_in_ui(inc_width)
    Sleep(500)

所以我们将 inc_width 的函数信息传递给 c# 并从那里在 ExecuteInUI 中执行它。那么完整的代码将如下所示:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using System.IO;
using System.Threading;
using IronPython.Hosting;
using Microsoft.Scripting;
using Microsoft.Scripting.Hosting;

namespace AsyncIronPython
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        string script;
        ScriptEngine engine;
        ScriptScope scope;
        Thread threadScript;

        public MainWindow()
        {
            InitializeComponent();

            engine = Python.CreateEngine();
            scope = engine.CreateScope();
            string variableName = "isto";
            object gridMier = gridScript;
            scope.SetVariable(variableName, gridMier);
            scope.SetVariable("execute_in_ui", new Action<object>(ExecuteInUI));
        }

        public void ExecuteInUI(object obj)
        {
            this.Dispatcher.BeginInvoke((Action)(() =>
            {
                var op = engine.CreateOperations(scope);
                op.Invoke(obj);
            }));
        }

        public void rodarScript()
        {
            try
            {
                //PARTE PARA ADICIONAR BIBLIOTECAS BASICAS PARA DESENVOLVIMENTO COM OS SCRIPTS
                script = @"#Reference the WPF assemblies
import clr
clr.AddReferenceByName(""PresentationFramework, Version = 3.0.0.0, Culture =       neutral, PublicKeyToken = 31bf3856ad364e35"")
clr.AddReferenceByName(""PresentationCore, Version=3.0.0.0, Culture=neutral,     PublicKeyToken=31bf3856ad364e35"")
import System.Windows
def getMyObject():
    return isto

objeto = getMyObject()

#Atalhos de referencias para adicionar
Thickness = System.Windows.Thickness
from System.Threading.Thread import Sleep
Debug = System.Diagnostics.Debug";

                this.Dispatcher.Invoke((Action)(() =>
                {
                    script = script + "\n" + textBoxScript.Text;
                }));

                var source = engine.CreateScriptSourceFromString(script, SourceCodeKind.Statements);
                //var compiled = source.Compile();
                //var result = compiled.Execute(scope);
                source.Execute(scope);
            }
            catch (Exception qualquerExcecaoEncontrada)
            {
                MessageBox.Show(qualquerExcecaoEncontrada.ToString(), "Scripting Test do Mier", MessageBoxButton.OK);
            }
        }

        private void buttonScript_Click(object sender, RoutedEventArgs e)
        {
            threadScript = new Thread(rodarScript);
            threadScript.Start();
        }
    }
}

XAML:

<Window x:Class="AsyncIronPython.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:AsyncIronPython"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid x:Name="gridScript">
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="30" />
        </Grid.RowDefinitions>

        <TextBox x:Name="textBoxScript" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Margin="3" AcceptsReturn="True" AcceptsTab="True" />
        <Button x:Name="buttonScript" Click="buttonScript_Click" VerticalAlignment="Center" HorizontalAlignment="Stretch" Content="Execute" Grid.Row="1" Margin="3" />

    </Grid>
</Window>

希望这对您有所帮助。