编译/程序运行时执行XAML [英] Compile/Execute XAML during program runtime

问题描述

我想创建一个从数据库中检索XAML代码，并显示检索代码中的WPF应用程序

I would like to create an WPF Application which retrieves XAML Code from a Database and displays the retrieved code.

比方说数据库返回下面的代码：

Lets say the database return the following code:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid x:Name="mainGrid">
        <Button Content="test case 1" 
                HorizontalAlignment="Left" 
                Margin="10,10,0,0" 
                VerticalAlignment="Top" 
                Width="100" 
                Click="TestCase1_OnClick" 
                Height="29"/>
    </Grid>
</Window>

我要如何执行运行时代码（或者只是在mainGrid的内容）？

How do i execute this code (or maybe just the content of the mainGrid) during runtime?

推荐答案

这是我如何解决了这个问题：

This is how i solved the problem:

我有3文件MainWindow.xaml，MainWindow.xaml.cs和wpftest.csproj

I have 3 files MainWindow.xaml, MainWindow.xaml.cs and wpftest.csproj.

MainWindow.xaml：

<Window x:Class="wpftest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Button Content="Button" HorizontalAlignment="Left" Margin="122,75,0,0" VerticalAlignment="Top" Width="75" Click="ButtonBase_OnClick"/>
    </Grid>
</Window>

MainWindow.xaml.cs

namespace wpftest
{
    using System.Windows;

    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Hello world", "does it work?");
        }
    }
}

wpftest.csproj
（注：该文件非常大，大部分的东西是没有必要的，您可以按照本指南操作创建一个更简单的解决方案：的演练：从头开始创建 MSBuild项目文件）

wpftest.csproj (Note: this file is very large and the most of the stuff is not necessary. You could create a much more simplified solution by following this guide: Walkthrough: Creating an MSBuild Project File from Scratch )

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProjectGuid>{E3FBAE41-AF7E-4C7E-A69E-ADAEAEE76FA2}</ProjectGuid>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>wpftest</RootNamespace>
    <AssemblyName>wpftest</AssemblyName>
    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
    <FileAlignment>512</FileAlignment>
    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <PlatformTarget>AnyCPU</PlatformTarget>
    <DebugSymbols>true</DebugSymbols>
    <DebugType>full</DebugType>
    <Optimize>false</Optimize>
    <OutputPath>bin\Debug\</OutputPath>
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <PlatformTarget>AnyCPU</PlatformTarget>
    <DebugType>pdbonly</DebugType>
    <Optimize>true</Optimize>
    <OutputPath>bin\Release\</OutputPath>
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="System" />
    <Reference Include="System.Data" />
    <Reference Include="System.Xml" />
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="System.Core" />
    <Reference Include="System.Xml.Linq" />
    <Reference Include="System.Data.DataSetExtensions" />
    <Reference Include="System.Xaml">
      <RequiredTargetFramework>4.0</RequiredTargetFramework>
    </Reference>
    <Reference Include="WindowsBase" />
    <Reference Include="PresentationCore" />
    <Reference Include="PresentationFramework" />
  </ItemGroup>
  <ItemGroup>
    <Page Include="MainWindow.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Compile Include="MainWindow.xaml.cs">
      <DependentUpon>MainWindow.xaml</DependentUpon>
      <SubType>Code</SubType>
    </Compile>
  </ItemGroup>
  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>

解决方案：

下面的代码片段将编译代码，创建的dll文件，并通过反射使用创建的DLL。出现这种情况（全部）应用程序运行时。

The following code snippet will compile the code, created the dll file and use the created dll via reflection. This happens (all) during the application runtime.

特别感谢道格为这计算器问题

Special thanks to doug for this stackoverflow question

    private void TestCase4_OnClick(object sender, RoutedEventArgs e)
    {
        var globalProperties = new Dictionary<string, string>();
        var buildRequest = new BuildRequestData(@"C:\Users\jbu\wpftest\wpftest.csproj", globalProperties, null, new string[] { "Build" }, null);
        var pc = new ProjectCollection();

        var result = BuildManager.DefaultBuildManager.Build(new BuildParameters(pc), buildRequest);

        Assembly assembly = Assembly.LoadFrom(@"C:\Users\jbu\wpftest\bin\Debug\wpftest.dll");
        var instance = assembly.CreateInstance("wpftest.MainWindow") as Window;

        if (instance != null)
        {
            instance.Show();
        }
    } 

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