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WPF - 为什么不能往Library的工程中添加WPF window

项目中添加一个Library 工程,但是却无法加入WPF window, WPF customize control.

调查了一下,发现这一切都由于Library工程中没有:ProjectTypeGuids

 

<?xml version="1.0" encoding="utf-8"?><Project ToolsVersion="12.0" 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>{072127C4-0CED-4FA8-8010-7A014E1BDF73}</ProjectGuid>    <OutputType>Library</OutputType>    <AppDesignerFolder>Properties</AppDesignerFolder>    <RootNamespace>Honeywell.OSM.AircraftManagement</RootNamespace>    <AssemblyName>Honeywell.OSM.AircraftManagement</AssemblyName>    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>    <FileAlignment>512</FileAlignment>    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>    <TargetFrameworkProfile>Client</TargetFrameworkProfile>  </PropertyGroup>

用Notepad++打开工程,加入ProjectTypeGuids,一切正常了。