仅当文件尚未在项目中时，是否可以告诉nuGet将文件安装到项目中? [英] Is there a way to tell nuGet to install a file, into a project, only if the file is not already in the project?

问题描述

是否有一种配置nuGet软件包的方法，以便仅在项目中不存在文件的情况下，才在项目内部安装文件?

Is there a way to configure a nuGet package so that a file is installed, inside a project, only if it does not already exist in the project?

具体地说，我的nuGet软件包包含一个自定义配置文件.安装后，用户将对文件进行修改.问题在于，当用户安装新版本的nuGet软件包时，配置文件将被替换-从而丢失了所做的更改.我想防止这种情况.

Specifically, my nuGet package contains a custom config file. Once installed, the user will make modifications to the file. The problem is that the config file gets replaced when the user installs a new version of my nuGet package -- thus, losing their changes. I want to prevent this.

推荐答案

让我们假设您正在使用Visual Studio，并且如果缺少log4net.config，则需要对其进行部署.

Let's assume that you are using Visual Studio and need to deploy log4net.config if it is missing.

• 使用* .nuspec文件在文件夹下创建工具"文件夹

• 添加到nuspec文件:

• Create the "tools" folder under the folder with your *.nuspec file

• Add to the nuspec file:

     <file src="tools/**/*.*" target="\" /> 
  </files>
</package>

它将工具文件夹中的文件包含在软件包中

It will include the files in the tools folder into the package

• 在工具文件夹中放置文件install.ps1，其代码类似于:

• place inside the tools folder the file install.ps1 with some code similar to:

param($installPath, $toolsPath, $package, $project)

$log4netInProjectFolder = $project.ProjectItems | Where-Object { $_.Properties.Item("Filename").Value -eq "log4net.config" }

if ($log4netInProjectFolder -eq $null)
{
    Write-Host "File with path $deployTarget doesn't exist, deploying default log4net.config"

    foreach($item in $filesToMove) 
    {
        Write-Host "Moving " $item.Properties.Item("FullPath").Value
        (Get-Interface $project.ProjectItems "EnvDTE.ProjectItems").AddFromFileCopy($item.Properties.Item("FullPath").Value)
        (Get-Interface $item "EnvDTE.ProjectItem").Delete()
    }   
 }
 else
{
    Write-Host "File $deployTarget already exists, preserving existing file."
}

使用(例如)创建包:

nuget pack PackageWithMyLogConfig.nuspec -Version 1.0.0

如果要查看生成的程序包，请将其重命名为* .zip.然后，您可以使用任何存档管理器查看内部内容.

If you want to look inside the generated package, rename it to *.zip. Then you can view what's inside using any archive manager.

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