由网友(決裂溫柔の)分享简介：我知道，通常情况下，在的MissingMethodException单意味着你要引用未在单声道实施框架的一部分，即使它是在Microsoft .NET框架提供。然而，在这种情况下，我接收到的MissingMethodException的仅的参照自己code进行方法。然而，这仅发生在单由于异常不包含任何我的code，...
我知道，通常情况下，在的MissingMethodException单意味着你要引用未在单声道实施框架的一部分，即使它是在Microsoft .NET框架提供。然而，在这种情况下，我接收到的MissingMethodException的仅的参照自己code进行方法。然而，这仅发生在单
由于异常不包含任何我的code，直到缺失的方法，我甚至不知道从哪里开始寻找这个问题。
下面是例外：
未处理的异常：System.MissingMethodException：未找到方法：ParkingMapper.GeoHash.IndexGeoHash。
在（包装管理到本机）System.Reflection.MonoMethodInfo：get_method_info（IntPtr的，System.Reflection.MonoMethodInfo和放大器;）
在System.Reflection.MonoMethodInfo.GetMethodInfo（IntPtr的手柄）[0x00000]在C： cygwin的 TMP monobuild 编译 BUILD 单2.10.1 MCS 类 corlib System.Reflect
离子 MonoMethod.cs：63
在System.Reflection.MonoMethod.GetPseudoCustomAttributes（）[0x00002]在C： cygwin的 TMP monobuild 编译 BUILD 单2.10.1 MCS 类 corlib 的System.Reflection 中号
onoMethod.cs：295
在System.MonoCustomAttrs.GetPseudoCustomAttributes（ICustomAttributeProvider OBJ，System.Type的属性类型）0x0000d]在C： cygwin的 TMP monobuild 建立 BUILD
单2.10.1 MCS 类 corlib SYSTEM MonoCustomAttrs.cs：68
在System.MonoCustomAttrs.IsDefined（ICustomAttributeProvider OBJ，System.Type的属性类型，布尔继承）[0x00039]在C： cygwin的 TMP monobuild 建立 BUIL
ð单2.10.1 MCS 类 corlib SYSTEM MonoCustomAttrs.cs：291
在System.Reflection.MonoMethod.IsDefined（System.Type的属性类型，布尔继承）[0x00000]在C： cygwin的 TMP monobuild 编译 BUILD 单2.10.1 MCS 类
corlib 的System.Reflection MonoMethod.cs：276
在Microsoft.Internal.AttributeServices.IsAttributeDefined [ExportAttribute]（ICustomAttributeProvider attributeProvider，布尔继承）[0x00000]中C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelMicrosoftInternalAttributeServices.cs:40
在System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo.IsExport（ICustomAttributeProvider attributeProvider）[0x00000]中C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedPartCreationInfo.cs:355
在System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo+<GetExportMembers>c__Iterator0.MoveNext （）[0x001b5]在C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedPartCreationInfo.cs:304
在System.Linq.Enumerable.Any [的MemberInfo]（IEnumerable`1源）[0x00024]在C： cygwin的 TMP monobuild 编译 BUILD 单2.10.1 MCS 类 System.Core程序系统。 LINQ的 Enumerable.cs：136
在System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo.HasExports（）[0x00000]在C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedPartCreationInfo.cs:106
在System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo.IsPartDiscoverable（）[0x0003a]在C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedPartCreationInfo.cs:95
在System.ComponentModel.Composition.AttributedModel.AttributedModelDiscovery.CreatePartDefinitionIfDiscoverable （System.Type的类型，ICompositionElement原点）[0x0000a]中C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedModelDiscovery.cs:19
在System.ComponentModel.Composition.Hosting.TypeCatalog.get_PartsInternal（）[0x00051]在C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionHostingTypeCatalog.cs:166
在System.ComponentModel.Composition.Hosting.TypeCatalog.CreateIndex（）[0x0000b]在C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionHostingTypeCatalog.cs:263
在System.Lazy`1[System.Collections.Generic.IDictionary`2[System.String,System.Collections.Generic.List`1[System.ComponentModel.Composition.Primitives.ComposablePartDefinition]]].InitValue （）[0x0014f]在C： cygwin的 TMP monobuild 编译 BUILD 单2.10.1 MCS 类 corlib SYSTEM Lazy.cs：155
解决方案
明白了！看来MEF的单不喜欢DirectoryCatalog引用的DLL，没有出口。我指着当前组件目录，这是一个禁忌的单声道。
I am aware that typically, MissingMethodException in Mono means that you are referencing a part of the framework that isn't implemented in Mono, even though it is available in the Microsoft .NET framework. However, in this case, I am receiving a MissingMethodException only referring to a method in my own code. However, it only occurs on Mono.
Since the exception doesn't contain any of my code until the missing method, I'm not even sure where to begin to look for the issue.
Here is the exception:
Unhandled Exception: System.MissingMethodException: Method not found: 'ParkingMapper.GeoHash.IndexGeoHash'.
at (wrapper managed-to-native) System.Reflection.MonoMethodInfo:get_method_info (intptr,System.Reflection.MonoMethodInfo&)
at System.Reflection.MonoMethodInfo.GetMethodInfo (IntPtr handle) [0x00000] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclasscorlibSystem.Reflect
ionMonoMethod.cs:63
at System.Reflection.MonoMethod.GetPseudoCustomAttributes () [0x00002] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclasscorlibSystem.ReflectionM
onoMethod.cs:295
at System.MonoCustomAttrs.GetPseudoCustomAttributes (ICustomAttributeProvider obj, System.Type attributeType) [0x0000d] in C:cygwintmpmonobuildbuildBUILD
mono-2.10.1mcsclasscorlibSystemMonoCustomAttrs.cs:68
at System.MonoCustomAttrs.IsDefined (ICustomAttributeProvider obj, System.Type attributeType, Boolean inherit) [0x00039] in C:cygwintmpmonobuildbuildBUIL
Dmono-2.10.1mcsclasscorlibSystemMonoCustomAttrs.cs:291
at System.Reflection.MonoMethod.IsDefined (System.Type attributeType, Boolean inherit) [0x00000] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclass
corlibSystem.ReflectionMonoMethod.cs:276
at Microsoft.Internal.AttributeServices.IsAttributeDefined[ExportAttribute] (ICustomAttributeProvider attributeProvider, Boolean inherit) [0x00000] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelMicrosoftInternalAttributeServices.cs:40
at System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo.IsExport (ICustomAttributeProvider attributeProvider) [0x00000] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedPartCreationInfo.cs:355
at System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo+<GetExportMembers>c__Iterator0.MoveNext () [0x001b5] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedPartCreationInfo.cs:304
at System.Linq.Enumerable.Any[MemberInfo] (IEnumerable`1 source) [0x00024] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.CoreSystem.LinqEnumerable.cs:136
at System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo.HasExports () [0x00000] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedPartCreationInfo.cs:106
at System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo.IsPartDiscoverable () [0x0003a] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedPartCreationInfo.cs:95
at System.ComponentModel.Composition.AttributedModel.AttributedModelDiscovery.CreatePartDefinitionIfDiscoverable (System.Type type, ICompositionElement origin) [0x0000a] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionAttributedModelAttributedModelDiscovery.cs:19
at System.ComponentModel.Composition.Hosting.TypeCatalog.get_PartsInternal () [0x00051] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionHostingTypeCatalog.cs:166
at System.ComponentModel.Composition.Hosting.TypeCatalog.CreateIndex () [0x0000b] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclassSystem.ComponentModel.CompositionsrcComponentModelSystemComponentModelCompositionHostingTypeCatalog.cs:263
at System.Lazy`1[System.Collections.Generic.IDictionary`2[System.String,System.Collections.Generic.List`1[System.ComponentModel.Composition.Primitives.ComposablePartDefinition]]].InitValue () [0x0014f] in C:cygwintmpmonobuildbuildBUILDmono-2.10.1mcsclasscorlibSystemLazy.cs:155
解决方案
Got it! It seems MEF in Mono doesn't like a DirectoryCatalog that references DLLs with no exports. I was pointing at the current assembly directory, which is a no-no in Mono.
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