找不到方法：“System.Type.op_Equality”

Question

我得到了这个错误

System.MissingMethodException: Method not found: 'System.Type.op_Equality'.

在运行构建时。(可能是因为我在Android模拟器上，而JIT正在捕捉它。)

在构建时，我收到了以下警告：

Target ResolveAssemblyReferences:
/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/Microsoft.Common.targets:  warning : Reference 'Mono.Android' not resolved
        For searchpath {CandidateAssemblyFiles}
        Warning: {CandidateAssemblyFiles} not supported currently
        For searchpath {HintPathFromItem}
        HintPath attribute not found
        For searchpath {TargetFrameworkDirectory}
        Considered target framework dir /Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0, assembly named 'Mono.Android' not found.
        For searchpath {PkgConfig}
        Considered Mono.Android, but could not find in any pkg-config files.
        For searchpath {GAC}
        Considered Mono.Android, but could not find in the GAC.
        For searchpath {RawFileName}

我已经在我的mac上安装了Mono for Android和MonoTouch。这会覆盖一些设置吗？

我也收到了这些警告：

Target ResolveAssemblyReferences:
/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/Microsoft.Common.targets:  warning : Found a conflict between : 'System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' and 'System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. Using 'System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' reference.
/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/Microsoft.Common.targets:  warning : Found a conflict between : 'System, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' and 'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. Using 'System, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' reference.
/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/Microsoft.Common.targets:  warning : Found a conflict between : 'System.Xml, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' and 'System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. Using 'System.Xml, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' reference.

我确信在项目的编译器下有一些我不知道的设置。

Answer 1

看起来你似乎以某种方式结束了构建你的Mono for Android项目，引用了4.0程序集。理论上，这应该是不可能的，除非您使用文本编辑器编辑项目文件(MonoDevelop不允许您修改项目以实现此目的)。

我建议你从一个模板创建一个新的Mono for Android项目，然后比较两个项目文件，看看你能不能推断出你的项目出了什么问题。