修改MSBuild ItemGroup元数据 [英] Modify MSBuild ItemGroup Metadata

问题描述

是否可以在声明ItemGroup的元数据后对其进行修改.

Is it possible to modify a ItemGroup's metadata after it is declared.

例如:

  <ItemGroup>
    <SolutionToBuild Include="$(BuildProjectFolderPath)\MySolution.sln">
      <Targets></Targets>
      <Properties></Properties>
    </SolutionToBuild>

  </ItemGroup>

  <Target Name="BuildNumberOverrideTarget">
     <!--Code to get the version number from a file (removed)-->

     <!--Begin Pseudo Code-->
     <CodeToChangeItemGroupMetaData 
           ItemToChange="%(SolutionToBuild.Properties)" 
           Condition ="'%(SolutionToBuild.Identity)' ==
                       '$(BuildProjectFolderPath)\MySolution.sln'"
           NewValue="Version=$(Version)" />
     <!--End Pseudo Code-->         

  </Target>

我希望有一种方法不需要我删除项目然后重新声明.

I am hoping there is a way that does not require me to remove the item then re-declare it.

谢谢您的回答. 瓦卡诺

Thanks for any answers. Vaccano

推荐答案

为此，我必须编写一个自定义任务:

I had to write a custom task to do this:

这是它的工作方式

<ItemGroup>
  <ItemsToChange Include="@(SolutionToBuild)">
    <Properties>ChangedValue</Properties>
  </ItemsToChange>
  <MetaDataToChange Include="Properties"/>
</ItemGroup>

<UpdateMetadata SourceList="@(SolutionToBuild)" ItemsToModify="@(ItemsToChange)" MetadataToModify="@(MetaDataToChange)">
  <Output TaskParameter="NewList" ItemName="SolutionToBuildTemp" />
</UpdateMetadata>

<ItemGroup>
  <SolutionToBuild Remove="@(SolutionToBuild)"/>
  <SolutionToBuild Include ="@(SolutionToBuildTemp)"/>
</ItemGroup>

它使用更改后的值填充一个名为SolutionToBuildTemp的新项目.然后，我删除SolutionToBuild项中的所有内容，并用SolutionToBuildTemp项填充它.

It fills a new item called SolutionToBuildTemp with the changed value. I then remove everything in the SolutionToBuild item and fill it iwith the SolutionToBuildTemp item.

如果有人感兴趣，这是任务的代码(我也将其提交到MSBuildExtenstionPack).

Here is the code for the task if anyone is interested (I did submit it to the MSBuildExtenstionPack too).

// By Stephen Schaff (Vaccano).  
// Free to use for your code. Need my Permission to Sell it.
using System;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;

namespace UpdateMetadata
{
    ///<summary>
    /// Used to update the metadata in a ItemGroup (Note: Requires an MSBuild Call After using this task to complete the update.  See Usage.)
    /// Usage:
    /// &lt;?xml version="1.0" encoding="utf-8"?&gt;
    ///&lt;Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Testing" ToolsVersion="3.5"&gt;
    /// 
    ///  &lt;!-- Do not edit this --&gt;
    ///  &lt;Import Project="$(MSBuildExtensionsPath)\Microsoft\VisualStudio\TeamBuild\Microsoft.TeamFoundation.Build.targets" /&gt;
    ///  &lt;UsingTask AssemblyFile="C:\Base\Junk\UpdateMetadata\UpdateMetadata\bin\Debug\UpdateMetadata.dll" TaskName="UpdateMetadata"/&gt;
    /// 
    /// 
    ///  &lt;!--Re-setup the solutions to build definition--&gt;
    ///  &lt;ItemGroup&gt;
    ///    &lt;SolutionToBuild Include="$(BuildProjectFolderPath)\ChangeThisOne.sln"&gt;
    ///      &lt;Properties&gt;Change&lt;/Properties&gt;
    ///    &lt;/SolutionToBuild&gt;
    ///    &lt;SolutionToBuild Include="$(BuildProjectFolderPath)\ChangeThisToo.sln"&gt;
    ///      &lt;Properties&gt;Change&lt;/Properties&gt;
    ///    &lt;/SolutionToBuild&gt;
    ///    &lt;SolutionToBuild Include="$(BuildProjectFolderPath)\DontChangeThisOne.sln"&gt;
    ///      &lt;Properties&gt;Don'tChange&lt;/Properties&gt;
    ///    &lt;/SolutionToBuild&gt;
    ///  &lt;/ItemGroup&gt;
    /// 
    ///  &lt;Target Name="Testing"&gt;
    ///    &lt;Message Text="Before = %(SolutionToBuild.Identity) %(SolutionToBuild.Properties)" /&gt;
    /// 
    ///    &lt;ItemGroup&gt;
    ///      &lt;ItemsToChange Include="@(SolutionToBuild)"&gt;
    ///        &lt;Properties&gt;ChangedValue&lt;/Properties&gt;
    ///      &lt;/ItemsToChange&gt;
    ///   
    ///      &lt;ItemsToChange Remove="%(ItemsToChange.rootdir)%(ItemsToChange.directory)DontChangeThisOne%(ItemsToChange.extension)"/&gt;      
    ///    &lt;/ItemGroup&gt;
    /// 
    ///    &lt;ItemGroup&gt;
    ///      &lt;MetaDataToChange Include="Properties"/&gt;
    ///    &lt;/ItemGroup&gt;
    /// 
    ///    &lt;UpdateMetadata SourceList="@(SolutionToBuild)" ItemsToModify="@(ItemsToChange)" MetadataToModify="@(MetaDataToChange)"&gt;
    ///      &lt;Output TaskParameter="NewList" ItemName="SolutionToBuildTemp" /&gt;
    ///    &lt;/UpdateMetadata&gt;
    /// 
    ///    &lt;ItemGroup&gt;
    ///      &lt;SolutionToBuild Remove="@(SolutionToBuild)"/&gt;
    ///      &lt;SolutionToBuild Include ="@(SolutionToBuildTemp)"/&gt;
    ///    &lt;/ItemGroup&gt;
    ///         
    ///    &lt;Message Text="After  = %(SolutionToBuild.Identity) %(SolutionToBuild.Properties)"/&gt;
    ///  &lt;/Target&gt;
    ///&lt;/Project&gt;
    ///</summary>
    public class UpdateMetadata : Task
    {
        ///<summary>
        /// The list to modify.
        ///</summary>
        [Required]
        public ITaskItem[] SourceList { get; set; }

        ///<summary>
        /// Items in <see cref="SourceList"/> to change the Metadata for.  
        /// It should have the valid metadata set.
        ///</summary>
        [Required]
        public ITaskItem[] ItemsToModify { get; set; }


        ///<summary>
        /// List of metadata to modify.  This is an item group, but any metadata in it is ignored.
        ///</summary>
        public ITaskItem[] MetadataToModify { get; set; }

        ///<summary>
        /// If true then info about the update is output
        ///</summary>
        public Boolean OutputMessages { get; set; }

        ///<summary>
        /// Changed List.  If you call the following it can replace the <see cref="SourceList"/>:
        ///</summary>
        [Output]
        public ITaskItem[] NewList { get; set; }

        ///<summary>
        /// Runs the task to output the updated version of the property
        ///</summary>
        ///<returns></returns>
        public override bool Execute()
        {
            // If we got empty params then we are done.
            if ((SourceList == null) || (ItemsToModify == null) || (MetadataToModify == null))
            {
                Log.LogMessage("One of the inputs to ModifyMetadata is Null!!!", null);
                return false;
            }
            if (OutputMessages)
                Log.LogMessage(MessageImportance.Low, "Beginning Metadata Changeover", null);
            int sourceIndex = 0;
            foreach (ITaskItem sourceItem in SourceList)
            {
                // Fill the new list with the source one
                NewList = SourceList;
                foreach (ITaskItem itemToModify in ItemsToModify)
                {
                    // See if this is a match.  If it is then change the metadat in the new list
                    if (sourceItem.ToString() == itemToModify.ToString())
                    {
                        foreach (ITaskItem metadataToModify in MetadataToModify)
                        {
                            try
                            {

                                if (OutputMessages)
                                    Log.LogMessage(MessageImportance.Low, "Changing {0}.{1}",
                                        NewList[sourceIndex].ToString(), metadataToModify.ToString());
                                // Try to change the metadata in the new list.
                                NewList[sourceIndex].SetMetadata(metadataToModify.ToString(),
                                                                 itemToModify.GetMetadata(metadataToModify.ToString()));

                            }
                            catch (System.ArgumentException exception)
                            {
                                // We got some bad metadata (like a ":" or something).
                                Log.LogErrorFromException(exception);
                                return false;
                            }
                        }
                    }
                }
                sourceIndex += 1;
            }

            return true;
        }
    }
}

我希望这对某些人有用，但是代码显然是使用风险自负".

I hope this is useful to some one, but the code is obviously "Use at your own risk".

Vaccano

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