C# System.NotSupportedException Xamarin

我有一个应用程序，有一个3步注册过程

姓名、电子邮件、密码（注册虚拟机内）

用户详细信息（用户配置文件内部）

药物摄入（在UserMedicineINC_vm内）

当我被导航到3）时，我能够通过1）和2），我看到了页面的UI，但突然出现了“未处理的异常”弹出框

调试输出中出现的错误：

System.NotSupportedException: Don't know about System.Collections.Generic.ICollection`1[LoginSystem.Models.Medicine]

我想这是因为我的Medicine类（在models文件夹中）中有这行代码：

*Medicine和Medicine_事件定义了一些字段，如：

public string Medicine_Name { get; set; }
public string Medicine_Desc { get; set; }

Xamarin是否禁止使用Icollections

如果你知道发生了什么事，请告诉我。 谢谢

*应用程序输出：

06-19 10:26:50.382 E/EGL_emulation( 5282): tid 5308: eglSurfaceAttrib(1165): error 0x3009 (EGL_BAD_MATCH)
06-19 10:26:50.382 W/OpenGLRenderer( 5282): Failed to set EGL_SWAP_BEHAVIOR on surface 0x9a966180, error=EGL_BAD_MATCH
06-19 10:26:50.433 E/EGL_emulation( 5282): tid 5308: eglSurfaceAttrib(1165): error 0x3009 (EGL_BAD_MATCH)
06-19 10:26:50.433 W/OpenGLRenderer( 5282): Failed to set EGL_SWAP_BEHAVIOR on surface 0x9a966060, error=EGL_BAD_MATCH
06-19 10:26:50.663 E/EGL_emulation( 5282): tid 5308: eglSurfaceAttrib(1165): error 0x3009 (EGL_BAD_MATCH)
06-19 10:26:50.663 W/OpenGLRenderer( 5282): Failed to set EGL_SWAP_BEHAVIOR on surface 0x9a7a0aa0, error=EGL_BAD_MATCH
06-19 10:26:51.898 D/Mono    ( 5282): Assembly Ref addref LoginSystem[0x9dfec2a0] -> SQLite-net[0xad9e9dc0]: 2
06-19 10:26:51.916 D/Mono    ( 5282): Unloading image System.Threading.Tasks.dll [0x9a853f00].
06-19 10:26:51.916 D/Mono    ( 5282): Image addref System.Threading.Tasks[0x9a864300] -> System.Threading.Tasks.dll[0x9cc96000]: 6
06-19 10:26:51.916 D/Mono    ( 5282): Config attempting to parse: 'System.Threading.Tasks.dll.config'.
06-19 10:26:51.916 D/Mono    ( 5282): Config attempting to parse: '/usr/local/etc/mono/assemblies/System.Threading.Tasks/System.Threading.Tasks.config'.
06-19 10:26:51.916 D/Mono    ( 5282): Assembly Ref addref SQLite-net[0xad9e9dc0] -> System.Threading.Tasks[0x9dfed020]: 4
06-19 10:26:51.962 D/Mono    ( 5282): Unloading image System.Collections.dll [0xab2f7400].
06-19 10:26:51.962 D/Mono    ( 5282): Image addref System.Collections[0xaec94f60] -> System.Collections.dll[0x9d004f00]: 7
06-19 10:26:51.962 D/Mono    ( 5282): Config attempting to parse: 'System.Collections.dll.config'.
06-19 10:26:51.962 D/Mono    ( 5282): Config attempting to parse: '/usr/local/etc/mono/assemblies/System.Collections/System.Collections.config'.
06-19 10:26:51.962 D/Mono    ( 5282): Assembly Ref addref SQLite-net[0xad9e9dc0] -> System.Collections[0x9dfec4e0]: 5
06-19 10:26:51.965 D/Mono    ( 5282): Unloading image System.Runtime.Extensions.dll [0xab2f7400].
06-19 10:26:51.965 D/Mono    ( 5282): Image addref System.Runtime.Extensions[0xaec94f60] -> System.Runtime.Extensions.dll[0x9d007c00]: 6
06-19 10:26:51.965 D/Mono    ( 5282): Config attempting to parse: 'System.Runtime.Extensions.dll.config'.
06-19 10:26:51.965 D/Mono    ( 5282): Config attempting to parse: '/usr/local/etc/mono/assemblies/System.Runtime.Extensions/System.Runtime.Extensions.config'.
06-19 10:26:51.965 D/Mono    ( 5282): Assembly Ref addref SQLite-net[0xad9e9dc0] -> System.Runtime.Extensions[0x9dfecb40]: 4
06-19 10:26:51.965 D/Mono    ( 5282): Assembly Ref addref SQLite-net[0xad9e9dc0] -> SQLitePCLRaw.core[0xad9e9f40]: 2
06-19 10:26:51.975 D/Mono    ( 5282): Unloading image System.Threading.dll [0xab2f7400].
06-19 10:26:51.975 D/Mono    ( 5282): Image addref System.Threading[0xaec949c0] -> System.Threading.dll[0xb2facb00]: 7
06-19 10:26:51.975 D/Mono    ( 5282): Config attempting to parse: 'System.Threading.dll.config'.
06-19 10:26:51.975 D/Mono    ( 5282): Config attempting to parse: '/usr/local/etc/mono/assemblies/System.Threading/System.Threading.config'.
06-19 10:26:51.975 D/Mono    ( 5282): Assembly Ref addref SQLite-net[0xad9e9dc0] -> System.Threading[0x9dfec5a0]: 5
06-19 10:26:51.983 D/Mono    ( 5282): Assembly Ref addref SQLite-net[0xad9e9dc0] -> SQLitePCLRaw.batteries_v2[0xad9e9d00]: 2
06-19 10:26:51.984 D/Mono    ( 5282): Assembly Ref addref SQLitePCLRaw.batteries_v2[0xad9e9d00] -> SQLitePCLRaw.provider.e_sqlite3[0xad9e9e20]: 2
06-19 10:26:51.984 D/Mono    ( 5282): Assembly Ref addref SQLitePCLRaw.provider.e_sqlite3[0xad9e9e20] -> SQLitePCLRaw.core[0xad9e9f40]: 3
06-19 10:26:51.985 D/Mono    ( 5282): Assembly Ref addref SQLitePCLRaw.batteries_v2[0xad9e9d00] -> SQLitePCLRaw.core[0xad9e9f40]: 4
06-19 10:26:51.992 D/Mono    ( 5282): DllImport attempting to load: 'e_sqlite3'.
06-19 10:26:51.994 D/Mono    ( 5282): DllImport error loading library '/storage/emulated/0/Android/data/LoginSystem.Android/files/.__override__/libe_sqlite3': 'dlopen failed: library "/data/app/LoginSystem.Android-1/lib/x86//storage/emulated/0/Android/data/LoginSystem.Android/files/.__override__/libe_sqlite3" not found'.
06-19 10:26:51.995 D/Mono    ( 5282): DllImport error loading library '/storage/emulated/0/Android/data/LoginSystem.Android/files/.__override__/libe_sqlite3.so': 'dlopen failed: library "/data/app/LoginSystem.Android-1/lib/x86//storage/emulated/0/Android/data/LoginSystem.Android/files/.__override__/libe_sqlite3.so" not found'.
06-19 10:26:51.995 D/Mono    ( 5282): DllImport error loading library '/system/lib/libe_sqlite3': 'dlopen failed: library "/data/app/LoginSystem.Android-1/lib/x86//system/lib/libe_sqlite3" not found'.
06-19 10:26:51.996 D/Mono    ( 5282): DllImport error loading library '/system/lib/libe_sqlite3.so': 'dlopen failed: library "/data/app/LoginSystem.Android-1/lib/x86//system/lib/libe_sqlite3.so" not found'.
06-19 10:26:51.996 D/Mono    ( 5282): DllImport error loading library 'libe_sqlite3': 'dlopen failed: library "/data/app/LoginSystem.Android-1/lib/x86/libe_sqlite3" not found'.
06-19 10:26:51.999 D/Mono    ( 5282): DllImport loaded library 'libe_sqlite3.so'.
06-19 10:26:52.000 D/Mono    ( 5282): DllImport searching in: 'e_sqlite3' ('libe_sqlite3.so').
06-19 10:26:52.000 D/Mono    ( 5282): Searching for 'sqlite3_libversion_number'.
06-19 10:26:52.007 D/Mono    ( 5282): DllImport searching in: 'e_sqlite3' ('libe_sqlite3.so').
06-19 10:26:52.007 D/Mono    ( 5282): Searching for 'sqlite3_open_v2'.
06-19 10:26:52.028 D/Mono    ( 5282): DllImport searching in: 'e_sqlite3' ('libe_sqlite3.so').
06-19 10:26:52.028 D/Mono    ( 5282): Searching for 'sqlite3_busy_timeout'.
06-19 10:26:52.036 D/Mono    ( 5282): Unloading image System.Reflection.dll [0xab2fab00].
06-19 10:26:52.036 D/Mono    ( 5282): Image addref System.Reflection[0xaec950e0] -> System.Reflection.dll[0x9d005400]: 8
06-19 10:26:52.036 D/Mono    ( 5282): Config attempting to parse: 'System.Reflection.dll.config'.
06-19 10:26:52.036 D/Mono    ( 5282): Config attempting to parse: '/usr/local/etc/mono/assemblies/System.Reflection/System.Reflection.config'.
06-19 10:26:52.036 D/Mono    ( 5282): Assembly Ref addref SQLite-net[0xad9e9dc0] -> System.Reflection[0x9dfec600]: 6
06-19 10:26:52.037 D/Mono    ( 5282): Unloading image System.Linq.dll [0xab2fab00].
06-19 10:26:52.038 D/Mono    ( 5282): Image addref System.Linq[0xaec950e0] -> System.Linq.dll[0x9d007200]: 7
06-19 10:26:52.038 D/Mono    ( 5282): Config attempting to parse: 'System.Linq.dll.config'.
06-19 10:26:52.038 D/Mono    ( 5282): Config attempting to parse: '/usr/local/etc/mono/assemblies/System.Linq/System.Linq.config'.
06-19 10:26:52.038 D/Mono    ( 5282): Assembly Ref addref SQLite-net[0xad9e9dc0] -> System.Linq[0x9dfec900]: 5
06-19 10:26:52.169 E/Surface ( 5282): getSlotFromBufferLocked: unknown buffer: 0x9bd87280
InspectorDebugSession(9): HandleTargetEvent: UnhandledException
06-19 10:27:04.139 I/art     ( 5282): Thread[2,tid=5287,WaitingInMainSignalCatcherLoop,Thread*=0xab32c500,peer=0x12c770a0,"Signal Catcher"]: reacting to signal 3
06-19 10:27:04.224 I/art     ( 5282): Wrote stack traces to '/data/anr/traces.txt'

---

我建议在Medicine_事件类声明中添加一个引用与其关联的药物的ForeignKey

public class Medicine_Incident : Medicine
{
    // Whatever properties you have already defined

    ...

    // This is your link to your medicine PrimaryKey
    public int MedicineId { get; set; }
}

如果为了方便起见，希望在Medicine类声明中保留ICollection，请在其上抛出IgnoreAttribute，如下所示：

public class Medicine 
{
    // Whatever other stuff you have declared

    ...

    [Ignore]
    public virtual ICollection<Medicine_Incident> Medicine_Incident { get; set; }
}

公共级医学
{
//你申报的其他东西
...
[忽略]
公共虚拟ICollection\u事件{get；set；}
}

---

这确保了SQLite不会尝试为ICollection类型创建列，因为它不知道如何创建。

请包含异常堆栈traceAlright刚刚创建的，谢谢！这是应用程序的输出，而不是堆栈跟踪每次有人用下划线代替驼峰来表示c#，小猫痛苦地死去看着这个链接问题与sqlite有关：好吧，有道理，但我怎么才能替换这一行呢？医学.医学事件.增补（医学公司）；var med_inc=（医疗事件）绑定上下文；var medicine=（medicine）绑定上下文；我很乐意回答更多的问题，但在评论中这样做在StackOverflow中是不受欢迎的。如果你有一个全新的问题要问，请随意开始一个新的问题，充分考虑你所面临的问题。我理解。非常感谢，tho！：）

public class Medicine_Incident : Medicine
{
    // Whatever properties you have already defined

    ...

    // This is your link to your medicine PrimaryKey
    public int MedicineId { get; set; }
}

public class Medicine 
{
    // Whatever other stuff you have declared

    ...

    [Ignore]
    public virtual ICollection<Medicine_Incident> Medicine_Incident { get; set; }
}