答案的原文以下：You most likely get this message when the project points to an old location of the assembly where it no longer exists. Since you were able to build it once, the assembly has already been copied into your bin\Debug / bin\Release folders so your project can still find a copy.post
If you open the references node of the project in your solution explorer, there should be a yellow icon next to the reference. Remove the reference and add it again from the correct location.ui
If you want to know the location it was referenced from, you'd have to open the .csproj file in a text editor and look for the HintPath for that assembly - the IDE for some reason does not show this information.this
大意就是在.cspj文件中有一個黃線標誌的警告，將那個黃線標誌的警告的行刪除了以後（就是將某一個包引用刪除了），再從新引用一下這個包便可，那我上面貼圖的例子來講，Microsoft.AspNetCOre.Http.Abstractions這個包有問題，因此我就將他刪除了而後從新在nuget下載一下，問題就解決了。code