Yet another reason: If your pre-build event references another projects bin path and you see this error when running msbuild, but not Visual Studio, then you have to manually arrange the projects in the *.sln file (with a text editor) so that the project you are targeting in the event is built before the event's project. In other words, msbuild uses the order that projects are listed in the *.sln file whereas VS uses knowledge of project dependencies. I had this happen when a tool that creates a database to be included in a wixproj was listed after the wixproj.

仔细检查Output选项卡。

这应该能揭示问题的原因。

(例如，在我的例子中，它与注释有关:'#'不能被识别为内部或外部命令，可操作的程序或批处理文件。)

我认为在我的情况下，路径中有俄罗斯符号(所有项目都在用户文件夹中)。当我把溶液放在另一个文件夹(直接在磁盘上)时，一切都变得正常了。

我通过简单地重新启动Visual Studio来解决这个问题——我刚刚在控制台窗口中运行了dotnet工具安装xxx, VS还没有选择新的环境变量和/或路径设置，所以快速重新启动解决了这个问题。

您是否尝试给出在构建前或构建后事件命令中运行的命令的完整路径?

由于Visual Studio 2008中的xcopy post-build事件命令，我得到了9009错误。

命令“xcopy.exe /Y C:\projectpath\project. exe”config C:\compilepath\"退出代码为9009。

但我的情况是间歇性的。也就是说，错误消息一直持续到计算机重新启动，并在计算机重新启动后消失。在一些我尚未发现的远程相关问题之后，它又回来了。

然而，在我的情况下，提供命令的完整路径解决了问题:

c:\windows\system32\xcopy.exe /Y C:\projectpath\project.config C:\compilepath\ 

而不仅仅是:

xcopy.exe /Y C:\projectpath\project.config C:\compilepath\

如果我没有完整的路径，它会在重新启动后运行一段时间，然后停止。

另外，正如本文评论中提到的，如果全路径中有空格，则需要在命令周围加上引号。如。

"C:\The folder with spaces\ABCDEF\xcopy.exe" /Y C:\projectpath\project.config C:\compilepath\

注意，这个关于空格的例子没有经过测试。

Yet another reason: If your pre-build event references another projects bin path and you see this error when running msbuild, but not Visual Studio, then you have to manually arrange the projects in the *.sln file (with a text editor) so that the project you are targeting in the event is built before the event's project. In other words, msbuild uses the order that projects are listed in the *.sln file whereas VS uses knowledge of project dependencies. I had this happen when a tool that creates a database to be included in a wixproj was listed after the wixproj.