问题
I am working on a project using Mono for Android. After reading a cross-platform document with Xamarin. I had my data layer in a separate project and was going to move it to my Mono for Android project and then link those files to my Mono Touch project, and one day perhaps a Windows Phone 8 project.
When I moved the code, I am now unable to compile because of the System.Xml.Linq reference. The reference shows in the Mono for Android project, but I am unable to use it. I thought aiming for Froyo may be the problem, but upgrading the project to Gingerbread or Ice Cream Sandwich didn't help.
Does anybody know what I am doing wrong? I am a seasoned .NET developer and am well aware of how references work in project, but this one has me stumped.
The project the original code was working on was targeting the Mono/.NET 4 framework
回答1:
Is your reference to System.Xml.Linq pointing to the .Net version or the Mono version? The one for Mono will have Version 2.0.5.0.
Also, is the reference to System.Xml.Linq in a Android Class Library/Application or in a regular .Net Class library. If it is a .Net Class library, I would try referencing the library in your Android application as a compiled (dll) reference and not a project reference. It is not a perfect solution, but I have found that this works when I needed to reference libraries that I use across multiple solutions. The reference will generally work out fine, but if there is anything that is not supported in the Mono version, then it can cause issues.
Assuming you have your code in a class library, your best bet may be to create a Mono specific version of your library project. You can import and use the same class files, but just add some Conditional compilation symbols to have it compile properly for Mono. If you are not familiar with this, take a look at how Json.Net or ServiceStack manages code for multiple platforms.
来源：https://stackoverflow.com/questions/13924474/unable-to-use-system-xml-linq