I've got the AssemblyInfo feature of the MSBuild Extension Pack working, so that my assemblies description and file version have the details I want in the code below ...
But I want to apply this effect across every project in a 50+ project solution!
So how can I work on all the projects ... without going through each project adding the code?
<PropertyGroup>
<CoreCompileDependsOn>
$(CoreCompileDependsOn);
AssemblyDefaults;
</CoreCompileDependsOn>
</PropertyGroup>
<PropertyGroup>
<ExtensionTasksPath>
$(MSBuildProjectDirectory)\..\packages\MSBuild.Extension.Pack.1.4.0\tools\net40\
</ExtensionTasksPath>
</PropertyGroup>
<Import Project="$(ExtensionTasksPath)\MSBuild.ExtensionPack.tasks" />
<Target Name="AssemblyDefaults">
<ItemGroup>
<AssemblyInfoFiles Include=".\Properties\AssemblyInfo.cs" />
</ItemGroup>
<AssemblyInfo
AssemblyInfoFiles="#(AssemblyInfoFiles)"
AssemblyProduct="Compiled on: $([System.Environment]::MachineName)"
AssemblyDescription="Compiled at: $([System.DateTime]::Now)"
AssemblyFileBuildNumberType="DateString"
AssemblyFileBuildNumberFormat="MMdd"
AssemblyFileRevisionType="DateString"
AssemblyFileRevisionFormat="HHmm" />
</Target>
You could create a common assembly file for all the projects and edit the csproj files to refer to the common assembly info file like:
<Compile Include="..\CommonAssemblyInfo.cs">
<Link>Properties\CommonAssemblyInfo.cs</Link>
</Compile>
More information can be found at Shared AssemblyInfo for uniform versioning across the solution
Related
When I publish an ASP.NET Core 3.0 project, I get a few localized folders where the 4 assemblies shown are in each of these folders. I am not sure why these folders and files get included. None of my packages reference a CodeAnalysis package.
I added <PreserveCompilationContext>false</PreserveCompilationContext> in the csproj file but it didn't help. Is there a way to exclude them?
Add this:
<SatelliteResourceLanguages>en</SatelliteResourceLanguages>
to the .csproj file:
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp3.1</TargetFramework>
<SatelliteResourceLanguages>en</SatelliteResourceLanguages>
</PropertyGroup>
As suggested, you can use none to exclude all of them:
<SatelliteResourceLanguages>none</SatelliteResourceLanguages>
and taking consideration languages do you want like english and spanish:
<SatelliteResourceLanguages>en;es</SatelliteResourceLanguages>
Works with VS2019 and other versions
UPDATE 2021/2022:
Still working with Visual Studio 2022 and .NET 6
<PropertyGroup>
<TargetFramework>net6.0</TargetFramework>
<SatelliteResourceLanguages>en</SatelliteResourceLanguages>
<Nullable>enable</Nullable>
<ImplicitUsings>enable</ImplicitUsings>
</PropertyGroup>
You get a lot of language folders containing CodeAnalysis.dll files in your published output if you have a project reference to Microsoft.VisualStudio.Web.CodeGeneration.Design, which is needed for scaffolding controllers. If that is true for your project, change the package reference in your .csproj file to include ExcludeAssets="all"
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.0.0" ExcludeAssets="All" />
For example, old *.csproj file
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp3.0</TargetFramework>
<UserSecretsId>aspnet-foo-4E53EF45-B3BE-4943-81BE-2449DC5AA2BC</UserSecretsId>
<BlazorLinkOnBuild>false</BlazorLinkOnBuild>
</PropertyGroup>
<ItemGroup>
<!-- ... -->
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design"
Version="3.0.0" />
</ItemGroup>
<ItemGroup>
<!-- ... -->
</ItemGroup>
</Project>
New file *.csproj should be
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp3.0</TargetFramework>
<UserSecretsId>aspnet-foo-4E53EF45-B3BE-4943-81BE-2449DC5AA2BC</UserSecretsId>
<BlazorLinkOnBuild>false</BlazorLinkOnBuild>
</PropertyGroup>
<ItemGroup>
<!-- ... -->
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design"
Version="3.0.0"
ExcludeAssets="All" />
</ItemGroup>
<ItemGroup>
<!-- ... -->
</ItemGroup>
</Project>
In my case, the source of these localized folders was from the package Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation. It has a dependency on Microsoft.CodeAnalysis.Razor. You can read more about the purpose of the package here: https://learn.microsoft.com/en-us/aspnet/core/mvc/views/view-compilation?view=aspnetcore-3.1
You cannot just exclude an asset when trying to take advantage of the package. My work-around was to conditionally include the package reference whenever the project is in debug mode.
<ItemGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="3.1.1" />
</ItemGroup>
I then used an #if pre-processor directive to conditionally run the code that enables razor runtime compilation.
#if DEBUG
services.AddRazorPages().AddRazorRuntimeCompilation();
#else
services.AddRazorPages();
#endif
Please note: You may need to delete your bin folder to see the folders removed after a build. Also, make sure you are building under the correct solution configuration.
I was able to find a Github issue describing this exact scenario, but unfortunately it was never resolved. https://github.com/dotnet/extensions/issues/2247
MSBuild quite powerful and important tool, but sometimes configuration of it is the same hard as making a spaceship or flying to Mars. Answers on next questions can help makes it a little bit more usefull and developer friendly:
- How the MSBuild create a Package(zip)?
- Does it use some temporary folders or direct from builds output ?
- Why can the output folder content differ from a package content
- What events can be used to add some custom logic?
The answers to this question could help me with the next long story short:
I'm working with a .Net Core solution, that has the dependency on some other solutions DLLs files( that are not referenced directly, but required to be in the solution folder). On post-build event CL there is the option added as an entry point "\TaskEP" that is a starting point of the next pipeline :
<PropertyGroup>
<PipelineCopyAllFilesToOneFolderForMsdeployDependsOn>
TaskEP;
Task2;
Task3;
$(PipelineCopyAllFilesToOneFolderForMsdeployDependsOn);
</PipelineCopyAllFilesToOneFolderForMsdeployDependsOn>
<RunPostBuildEvent>Always</RunPostBuildEvent>
Tasks are mostly done for add extra DLLs to package and in general looks like :
<Target Name="TaskEP" Condition="$(SomeConditions) == 'True'">
<Message Importance="high" Text="TaskEP: Copying some files..." />
<ItemGroup>
<ItemsName Include="$(MSBuildProjectDirectory)\..\..somepath..\Extra.dll;....dll" />
<FilesForPackagingFromProject Include="%(ItemsName.Identity)">
<DestinationRelativePath>bin\%(RecursiveDir)%(Filename)%(Extension)</DestinationRelativePath>
</FilesForPackagingFromProject>
</ItemGroup>
</Target>
Basically, for me, this instruction to MSBuild to add "Extra.dll" to output package.
Pubxml is quite usual :
<PropertyGroup>
<WebPublishMethod>Package</WebPublishMethod>
<LastUsedBuildConfiguration>Release</LastUsedBuildConfiguration>
<LastUsedPlatform>Any CPU</LastUsedPlatform>
<SiteUrlToLaunchAfterPublish />
<LaunchSiteAfterPublish>True</LaunchSiteAfterPublish>
<_PackagePathShortened Condition="'$(_PackagePathShortened)' == ''">SuperWebSite</_PackagePathShortened>
<ExcludeApp_Data>False</ExcludeApp_Data>
<PackageLocation>..\..\..\..\BIN\WEB\Release\Publish\Super.WebApplication.zip</PackageLocation>
<PackageAsSingleFile>true</PackageAsSingleFile>
<TargetFramework>netcoreapp2.1</TargetFramework> ....
And one instruction that replaces the long long path in the package to Short and defined one:
<Target Name="AddReplaceRuleForAppPath" BeforeTargets="BeforePublish">
<Message Text="Adding replace rules for application path '$(PublishIntermediateOutputPath)' replace with '$(_PackagePathShortened)'" Importance="high" />
<EscapeTextForRegularExpressions Text="$(PublishIntermediateOutputPath)">
<Output PropertyName="_PackagePathRegex" TaskParameter="Result" />
</EscapeTextForRegularExpressions>
<!-- Add a replace rule for VSMSDeploy resp. MSdeploy to update the path -->
<ItemGroup>
<MsDeployReplaceRules Include="replaceFullPath">
<Match>$(_PackagePathRegex)</Match>
<Replace>$(_PackagePathShortened)</Replace>
</MsDeployReplaceRules>
</ItemGroup>
I also duplicated the same "Copy" tasks here in .pubxml file , play with different events "AfterBuild", "BeforePublish" but seems that all of the just ignoring. I can see the "Extra" DLLs files in the build output directory and all Info Messages on publishing, but not in the final "Super.WebApplication.zip" file !
The solution I found to copy extra files in .Net Core is taken from this documentation
<ItemGroup>
<DotnetPublishFiles Include="$(MSBuildProjectDirectory)\..\..somepath..\Extra.dll;....dll" >
<DestinationRelativePath>bin\x86\%(RecursiveDir)%(Filename)%(Extension)</DestinationRelativePath>
</DotnetPublishFiles>
</ItemGroup>
Given an MSBuild Task that runs in AfterTargets="AfterCompile" and produces some files how do you get those files to be included in the current projects output so that the files will be copied to the bin directory of any projects referencing that project?
I have no guarantees that this is the right solution but it seems to work:
<Target Name="MyTarget" AfterTargets="AfterCompile">
<PropertyGroup>
<MyInput>D:\1.txt</MyInput>
<MyOutput>$([System.IO.Path]::GetFullPath('$(MSBuildThisFileDirectory)$(OutDir)\1.txt'))</MyOutput>
</PropertyGroup>
<Copy SourceFiles="$(MyInput)" DestinationFolder="$(OutDir)" SkipUnchangedFiles="true" />
<ItemGroup>
<AllItemsFullPathWithTargetPath Include="$(MyOutput)">
<TargetPath>1.txt</TargetPath>
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</AllItemsFullPathWithTargetPath>
</ItemGroup>
</Target>
The relevant logic is here:
http://sourceroslyn.io/#MSBuildTarget=GetCopyToOutputDirectoryItems
http://sourceroslyn.io/#MSBuildItem=AllItemsFullPathWithTargetPath
Basically we rely on the fact that to determine the list of files to copy from dependent projects MSBuild calls the GetCopyToOutputDirectoryItems target of the dependent projects and uses its output (which is AllItemsFullPathWithTargetPath).
By adding ourselves to AllItemsFullPathWithTargetPath at the last minute we get picked up when a dependent project calls us.
Thank you, Kirill. That was an excellent answer and it helped me when trying to copy ETW manifest files from a different project's output. Below is the final output.
Since I've simply expanded upon Kirill's answer, I do not expect this answer to be accepted. I post this here in the hope it helps someone else.
<Target Name="IncludeEtwFilesInOutput"
BeforeTargets="GetCopyToOutputDirectoryItems">
<PropertyGroup>
<EtwManifestFile>$([System.IO.Path]::GetFullPath('$(MSBuildThisFileDirectory)$(OutDir)\My.etwManifest.man'))</EtwManifestFile>
<EtwResourceFile>$([System.IO.Path]::GetFullPath('$(MSBuildThisFileDirectory)$(OutDir)\My.etwManifest.dll'))</EtwResourceFile>
</PropertyGroup>
<ItemGroup>
<AllItemsFullPathWithTargetPath Include="$(EtwManifestFile)">
<TargetPath>My.etwManifest.man</TargetPath>
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</AllItemsFullPathWithTargetPath>
<AllItemsFullPathWithTargetPath Include="$(EtwResourceFile)">
<TargetPath>My.etwManifest.dll</TargetPath>
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</AllItemsFullPathWithTargetPath>
</ItemGroup>
</Target>
I have an MSBuild script which compiles my existing solution but I'd like to change some properties of one of the projects within the solution at compile-time, including but not limited to AssemblyProduct and AssemblyTitle.
Here's a snippet of my build script:
<Target Name="Compile" >
<MSBuild Projects="..\MySolution.sln"
Properties="Configuration=MyReleaseConfig;Platform=x86" />
</Target>
I've got one main executable and several DLLs that are compiled. I am aware of the MSBuild Extension Pack and I suspect it might help me to get to where I need to be, although I'm not sure how to proceed.
Can I selectively change AssemblyInfo properties at build time?
You're on the right track with the MSBuild Extension Pack.
I find the easiest way to conditionally generate the assembly details at build time is to add an "AssemblyVersion" target directly to my .csproj file(s) that require an updated AssemblyInfo file. You can add the target directly to each csproj file that requires an updated AssemblyInfo file, or as I prefer to do it, create a custom targets file with the AssemblyVersion target and have each csproj file include your custom targets file.
Either way you likely want to use the MSBuild Extension Pack or the MSBuild Community Tasks to use their respective AssemblyInfo task.
Here's some code from our build scripts:
<!-- Import the AssemblyInfo task -->
<Import Project="$(MSBuildCommunityTasksPath)\MSBuild.Community.Tasks.Targets"/>
<!-- Overriding the Microsoft.CSharp.targets target dependency chain -->
<!-- Call our custom AssemblyVersion target before build, even from VS -->
<PropertyGroup>
<BuildDependsOn>
AssemblyVersion;
$(BuildDependsOn)
</BuildDependsOn>
</PropertyGroup>
<ItemGroup>
<AssemblyVersionFiles Include="$(MSBuildProjectDirectory)\Properties\AssemblyInfo.cs"/>
</ItemGroup>
<Target Name="AssemblyVersion"
Inputs="#(AssemblyVersionFiles)"
Outputs="UpdatedAssemblyVersionFiles">
<Attrib Files="%(AssemblyVersionFiles.FullPath)"
Normal="true"/>
<AssemblyInfo
CodeLanguage="CS"
OutputFile="%(AssemblyVersionFiles.FullPath)"
AssemblyCompany="$(CompanyName)"
AssemblyCopyright="Copyright $(CompanyName), All rights reserved."
AssemblyVersion="$(Version)"
AssemblyFileVersion="$(Version)">
<Output TaskParameter="OutputFile"
ItemName="UpdatedAssemblyVersionFiles"/>
</AssemblyInfo>
</Target>
Sneal's answer was very helpful, but I'd like to show what I actually ended up doing. Instead of editing csproj files (there are several) I instead added tasks to my build script. Here's a snippet:
<PropertyGroup>
<ProductName>MyApp</ProductName>
<CompanyName>MyCompany</CompanyName>
<Major>1</Major>
<Minor>0</Minor>
<Build>0</Build>
<Revision>0</Revision>
</PropertyGroup>
<ItemGroup>
<AssemblyVersionFiles Include="..\MyMainProject\Properties\AssemblyInfo.cs"/>
</ItemGroup>
<Target Name="AssemblyVersionMAIN" Inputs="#(AssemblyVersionFiles)" Outputs="UpdatedAssemblyVersionFiles">
<Attrib Files="%(AssemblyVersionFiles.FullPath)" Normal="true"/>
<AssemblyInfo
CodeLanguage="CS"
OutputFile="%(AssemblyVersionFiles.FullPath)"
AssemblyProduct="$(ProductName)"
AssemblyTitle="$(ProductName)"
AssemblyCompany="$(CompanyName)"
AssemblyCopyright="© $(CompanyName) 2010"
AssemblyVersion="$(Major).$(Minor).$(Build).$(Revision)"
AssemblyFileVersion="$(Major).$(Minor).$(Build).$(Revision)"
AssemblyInformationalVersion="$(Major).$(Minor).$(Build).$(Revision)">
<Output TaskParameter="OutputFile" ItemName="UpdatedAssemblyVersionFiles"/>
</AssemblyInfo>
</Target>
<Target Name="Compile" DependsOnTargets="AssemblyVersionMAIN">
<MSBuild Projects="..\MySolution.sln"
Properties="Configuration=Release;Platform=x86;Optimize=true" />
</Target>
Then, I can override my variables from the command line, or a batch script, like so:
set MAJ=1
set MIN=2
set BLD=3
set REV=4
msbuild buildScript.xml /t:Compile /p:Major=%MAJ% /p:Minor=%MIN% /p:Build=%BLD% /p:Revision=%REV%
<Target Name="SetVersion">
<ItemGroup>
<AssemblyInfoFiles Include="$(TargetDir)\**\AssemblyInfo.cs"/>
</ItemGroup>
<Message Text="change the Version number for:"/>
<Message Text="%(AssemblyInfoFiles.FullPath)"/>
<MSbuild.ExtensionPack.Framework.AssemblyInfo
AssemblyInfoFiles="#(AssemblyInfoFiles)"
AssemblyTitle="newTitle"
AssemblyMajorVersion="2"
AssemblyMinorVersion="0"/>
</Target>
I'd like to create a MSBuild project that reflects the project dependencies in a solution and wraps the VS projects inside reusable targets.
The problem I like solve doing this is to svn-export, build and deploy a specific assembly (and its dependencies) in an BizTalk application.
My question is: How can I make the targets for svn-exporting, building and deploying reusable and also reuse the wrapped projects when they are built for different dependencies?
I know it would be simpler to just build the solution and deploy only the assemblies needed but I'd like to reuse the targets as much as possible.
The parts
The project I like to deploy
<Project DefaultTargets="Deploy" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<ExportRoot Condition="'$(Export)'==''">Export</ExportRoot>
</PropertyGroup>
<Target Name="Clean_Export">
<RemoveDir Directories="$(ExportRoot)\My.Project.Dir" />
</Target>
<Target Name="Export_MyProject">
<Exec Command="svn export svn://xxx/trunk/Biztalk2009/MyProject.btproj --force" WorkingDirectory="$(ExportRoot)" />
</Target>
<Target Name="Build_MyProject" DependsOnTargets="Export_MyProject">
<MSBuild Projects="$(ExportRoot)\My.Project.Dir\MyProject.btproj" Targets="Build" Properties="Configuration=Release"></MSBuild>
</Target>
<Target Name="Deploy_MyProject" DependsOnTargets="Build_MyProject">
<Exec Command="BTSTask AddResource -ApplicationName:CORE -Source:MyProject.dll" />
</Target>
</Project>
The projects it depends upon look almost exactly like this (other .btproj and .csproj).
Wow, this is a loaded question for a forum post. I wrote about 20 pages on creating reusable .targets files in my book, but I'll get you started here with the basics here. I believe that the key to creating reusable build scripts (i.e. .targets files) is three elements:
Place behavior (i.e. targets) into separate files
Place data (i.e. properties and items, these are called .proj files) into their own files
Extensibility
.targets files should validate assumptions
The idea is that you want to place all of your targets into separate files and then these files will be imported by the files which will be driving the build process. These are the files which contain the data. Since you import the .targets files you get all the targets as if they had been defined inline. There will be a silent contract between the .proj and .targets files. This contract is defined in properties and items which both use. This is what needs to be validated.
The idea here is not new. This pattern is followed by .csproj (and other projects generated by Visual Studio). If you take a look your .csproj file you will not find a single target, just properties and items. Then towards the bottom of the file it imports Microsoft.csharp.targets (may differ depending on project type). This project file (along with others that it imports) contains all the targets which actually perform the build.
So it's layed out like this:
SharedBuild.targets
MyProduct.proj
Where MyProdcut.proj might look like:
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<!-- This uses a .targets file to off load performing the build -->
<PropertyGroup>
<Configuration Condition=" '$(Configuration)'=='' ">Release</Configuration>
<OutputPath Condition=" '$(OutputPath)'=='' ">$(MSBuildProjectDirectory)\BuildArtifacts\bin\</OutputPath>
</PropertyGroup>
<ItemGroup>
<Projects Include="$(MSBuildProjectDirectory)\..\ClassLibrary1\ClassLibrary1.csproj"/>
<Projects Include="$(MSBuildProjectDirectory)\..\ClassLibrary2\ClassLibrary2.csproj"/>
<Projects Include="$(MSBuildProjectDirectory)\..\ClassLibrary3\ClassLibrary3.csproj"/>
<Projects Include="$(MSBuildProjectDirectory)\..\WindowsFormsApplication1\WindowsFormsApplication1.csproj"/>
</ItemGroup>
<Import Project="SharedBuild.targets"/>
</Project>
And SharedBuild.targets might look like:
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<!-- This represents a re-usable build file -->
<Target Name="SharedBuild_Validate">
<!-- See http://sedodream.com/2009/06/30/ElementsOfReusableMSBuildScriptsValidation.aspx for more info
about this validation pattern
-->
<ItemGroup>
<_RequiredProperties Include ="Configuration">
<Value>$(Configuration)</Value>
</_RequiredProperties>
<_RequiredProperties Include ="OutputPath">
<Value>$(OutputPath)</Value>
</_RequiredProperties>
<_RequiredItems Include="Projects">
<RequiredValue>%(Projects.Identity)</RequiredValue>
<RequiredFilePath>%(Projects.Identity)</RequiredFilePath>
</_RequiredItems>
</ItemGroup>
<!-- Raise an error if any value in _RequiredProperties is missing -->
<Error Condition="'%(_RequiredProperties.Value)'==''"
Text="Missing required property [%(_RequiredProperties.Identity)]"/>
<!-- Raise an error if any value in _RequiredItems is empty -->
<Error Condition="'%(_RequiredItems.RequiredValue)'==''"
Text="Missing required item value [%(_RequiredItems.Identity)]" />
<!-- Validate any file/directory that should exist -->
<Error Condition="'%(_RequiredItems.RequiredFilePath)' != '' and !Exists('%(_RequiredItems.RequiredFilePath)')"
Text="Unable to find expeceted path [%(_RequiredItems.RequiredFilePath)] on item [%(_RequiredItems.Identity)]" />
</Target>
<PropertyGroup>
<BuildDependsOn>
SharedBuild_Validate;
BeforeBuild;
CoreBuild;
AfterBuild;
</BuildDependsOn>
</PropertyGroup>
<Target Name="Build" DependsOnTargets="$(BuildDependsOn)"/>
<Target Name="BeforeBuild"/>
<Target Name="AfterBuild"/>
<Target Name="CoreBuild">
<!-- Make sure output folder exists -->
<PropertyGroup>
<_FullOutputPath>$(OutputPath)$(Configuration)\</_FullOutputPath>
</PropertyGroup>
<MakeDir Directories="$(_FullOutputPath)"/>
<MSBuild Projects="#(Projects)"
BuildInParallel="true"
Properties="OutputPath=$(_FullOutputPath)"/>
</Target>
</Project>
Don't look too much at the SharedBuild_Validate target yet. I put that there for completeness but don't focus on it. You can find more info on that at my blog at http://sedodream.com/2009/06/30/ElementsOfReusableMSBuildScriptsValidation.aspx.
The important parts to notice are the extensibility points. Even though this is a very basic file, it has all the components of a reusable .targets file. You can customize it's behavior by passing in different properties and items to build. You can extend it's behavior by overriding a target (BeforeBuild, AfterBuild or even CoreBuild) and you can inject your own targets into the build with:
<Project ...>
...
<Import Project="SharedBuild.targets"/>
<PropertyGroup>
<BuildDependsOn>
$(BuildDependsOn);
CustomAfterBuild
</BuildDependsOn>
</PropertyGroup>
<Target Name="CustomAfterBuild">
<!-- Insert stuff here -->
</Target>
</Project>
In your case I would create an SvnExport.targets file which uses the required properties:
SvnExportRoot
SvnUrl
SvnWorkingDirectory
You will use these properties to do the Export.
Then create another one for Biztalk build and deploy. You could split this up into 2 if necessary.
Then inside of your .proj file you just import both and setup the targets to build in the right order, and your off.
This is only really the beginning of creating reusable build elements, but this should get the wheels turning in your head. I am going to post all of this to my blog as well as download links for all files.
UPDATE:
Posted to blog at http://sedodream.com/2010/03/19/ReplacingSolutionFilesWithMSBuildFiles.aspx