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copied!<p>Here is what we went with: </p> <pre><code><UsingTask TaskName="CompareDates" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll" > <ParameterGroup> <FileList ParameterType="Microsoft.Build.Framework.ITaskItem[]" Required="true" /> <CacheFile ParameterType="System.String" Required="true" /> <Result ParameterType="Microsoft.Build.Framework.ITaskItem[]" Output="true" /> </ParameterGroup> <Task> <Using Namespace="System"/> <Code Type="Fragment" Language="cs"> <![CDATA[ var modifiedFiles = new List<ITaskItem>(); //If the cache file exists, only return files that have been edited more recently than it if(File.Exists(CacheFile)) { DateTime cacheTimeStamp = File.GetLastWriteTime(CacheFile); foreach(var file in FileList) { if(DateTime.Compare(DateTime.Parse(file.GetMetadata("ModifiedTime")), cacheTimeStamp) > 0) { modifiedFiles.Add(file); } } Result = modifiedFiles.ToArray(); } //Otherwise, return all files else { Result = FileList; } ]]> </Code> </Task> </UsingTask> </code></pre> <p>We used it as follows:</p> <pre><code><CompareDates FileList="@(Compile)" CacheFile="My.StyleCop.Cache"> <Output TaskParameter="Result" ItemName="ChangedFiles"/> </CompareDates> </code></pre> <p>And updated the cache (after the stylecop task is executed):</p> <pre><code><Touch Files="My.StyleCop.cache" AlwaysCreate="true" Condition="'$(StyleCopViolationCount)' == '0'"/> <CreateItem Include="Apt.StyleCop.cache">`enter code here` <Output TaskParameter="Include" ItemName="FileWrites"/> </CreateItem> </code></pre>

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