ILSpy：Project file is incomplete. Expected imports are missing 错误解决方案

<Project Sdk="Microsoft.NET.Sdk.Desktop">
  <PropertyGroup>
    <AssemblyName>xxxxxxAssemblyName>
    <GenerateAssemblyInfo>FalseGenerateAssemblyInfo>
    <UseWindowsForms>TrueUseWindowsForms>
    <TargetFramework>net20TargetFramework>
  PropertyGroup>
  <PropertyGroup>
    <LangVersion>7LangVersion>
    <AllowUnsafeBlocks>TrueAllowUnsafeBlocks>
  PropertyGroup>
  <PropertyGroup>
    <RootNamespace />
  PropertyGroup>
  <ItemGroup>
    <None Remove="xxxxxx.xxxxxx.png" />
    <EmbeddedResource Include="xxxxxx.xxxxxx.png" />
  ItemGroup>
  <ItemGroup>
    <Reference Include="System.Design" />
  ItemGroup>
Project>

用ILSpy反编译生成的代码，用VS2017无法打开项目，抛出错误：

Project file is incomplete. Expected imports are missing

解决方法：

打开.csproj文件，将第一行后面的Desktop去掉改为：

<Project Sdk="Microsoft.NET.Sdk">

即可解决问题。