C＃MissingMethodException：未找到類型'System.Int32'的構造函數

Question

我想使用YAXLib處理XML，但每當我嘗試使用int，double或float字段序列化一個類時， 。 YAXLib試圖呼叫

DefaultValue = MemberType.InvokeMember(string.Empty, BindingFlags.CreateInstance, null, null, new object[0]); 

MemberType哪裏是System.Int32Type對象。

當然Int32沒有調用的構造函數。我試圖理解這是如何工作的。這是在更新版本的mono/C＃中引入的東西嗎？

這是Unity3d，使用Mono，.NET 2.0.5

MissingMethodException: Constructor on type 'System.Int32' not found. 
System.MonoType.InvokeMember (System.String name, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object target, System.Object[] args, System.Reflection.ParameterModifier[] modifiers, System.Globalization.CultureInfo culture, System.String[] namedParameters) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/MonoType.cs:398) 
System.Type.InvokeMember (System.String name, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object target, System.Object[] args) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/Type.cs:1149) 
YAXLib.MemberWrapper.InitDefaultValue() (at Assets/Vendor/YAXLib/MemberWrapper.cs:691) 
YAXLib.MemberWrapper.InitInstance() (at Assets/Vendor/YAXLib/MemberWrapper.cs:682) 
YAXLib.MemberWrapper..ctor (System.Reflection.MemberInfo memberInfo, YAXLib.YAXSerializer callerSerializer) (at Assets/Vendor/YAXLib/MemberWrapper.cs:122) 
YAXLib.YAXSerializer+<GetFieldsToBeSerialized>c__Iterator1.MoveNext() (at Assets/Vendor/YAXLib/YAXSerializer.cs:2815) 
YAXLib.YAXSerializer.SerializeBase (System.Object obj, System.Xml.Linq.XName className) (at Assets/Vendor/YAXLib/YAXSerializer.cs:722) 
YAXLib.YAXSerializer.SerializeBase (System.Object obj) (at Assets/Vendor/YAXLib/YAXSerializer.cs:609) 
YAXLib.YAXSerializer.SerializeXDocument (System.Object obj) (at Assets/Vendor/YAXLib/YAXSerializer.cs:539) 
YAXLib.YAXSerializer.Serialize (System.Object obj) (at Assets/Vendor/YAXLib/YAXSerializer.cs:349) 
DataHandler..ctor() (at Assets/DataWrangling/DataHandler.cs:36) 
YAXTestHarness.Start() (at Assets/DataWrangling/YAXTestHarness.cs:8) 

Answer 1

也許你想獲得最新版本YAX什麼的？

我只是用Google搜索YAXLib MemberWrapper，發現https://github.com/sinairv/YAXLib/blob/master/YAXLib/MemberWrapper.cs

有這個方法你有例外，在如下實施：

private void InitDefaultValue() 
    { 
     if(MemberType.IsValueType) 
      DefaultValue = MemberType.InvokeMember(string.Empty, BindingFlags.CreateInstance, null, null, new object[0]); 
     else 
      DefaultValue = null; 
    } 

，所以我稍微修改了它，並呼籲從一個控制檯應用程序和它的工作原理只是罰款返回0.

private static object InitDefaultValue(Type MemberType) 
    { 
     if (MemberType.IsValueType) 
      return MemberType.InvokeMember(string.Empty, BindingFlags.CreateInstance, null, null, new object[0]); 
     else 
      return null; 
    } 

    static void Main(string[] args) 
    { 
     Console.WriteLine(InitDefaultValue(typeof(System.Int32))); 
    } 

這使我相信YAXLib之間有一些不兼容單聲道版本，因爲它轉化爲「通過調用默認構造函數創建實例」，並且也應該在單聲道下工作。