Unity 问题之 打包真机运行报错 MissingMethodException: Default constructor not found for type xxxxxx 问题处理
目录
Unity 问题之 打包真机运行报错 MissingMethodException: Default constructor not found for type xxxxxx 问题处理
一、简单介绍
Unity 在开发中，记录一些报错问题，以便后期遇到同样问题处理。
二、问题现象
1、可能大家会遇到类似 System.MissingMethodException: Default constructor not found for type XXFramework.AssetModule.AssetModule 报错
2、或者类似如下的报错
2020/10/30 14:09:09.050 20499 20540 Error Unity MissingMethodException: Default constructor not found for type UnityEngine.ResourceManagement.AsyncOperations.ProviderOperation`1[[UnityEngine.AddressableAssets.Initialization.ResourceManagerRuntimeData, Unity.Addressables, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]
2020/10/30 14:09:09.050 20499 20540 Error Unity at System.RuntimeType.CreateInstanceMono (System.Boolean nonPublic) [0x00000] in <00000000000000000000000000000000>:0
2020/10/30 14:09:09.050 20499 20540 Error Unity at System.Activator.CreateInstance (System.Type type, System.Boolean nonPublic) [0x00000] in <00000000000000000000000000000000>:0
2020/10/30 14:09:09.050 20499 20540 Error Unity at UnityEngine.ResourceManagement.Util.LRUCacheAllocationStrategy.New (System.Type type, System.Int32 typeHash) [0x00000] in <00000000000000000000000000000000>:0
2020/10/30 14:09:09.050 20499 20540 Error Unity at UnityEngine.ResourceManagement.ResourceManager.CreateOperation[T] (System.Type actualType, System.Int32 typeHash, System.Int32 operationHash, System.Action`1[T] onDestroyAction) [0x00000] in <00000000000000000000000000000000>:0
2020/10/30 14:09:09.050 20499 20540 Error Unity at UnityEngine.ResourceManagement.ResourceManager.ProvideResource (UnityEngine.ResourceM
2020/10/30 14:09:09.057 20499 20540 Error Unity MissingMethodException: Default constructor not found for type UnityEngine.ResourceManagement.ResourceManager+CompletedOperation`1[[System.Collections.Generic.IList`1[[ThemeData, Assembly-CSharp, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]
2020/10/30 14:09:09.057 20499 20540 Error Unity at System.RuntimeType.CreateInstanceMono (System.Boolean nonPublic) [0x00000] in <00000000000000000000000000000000>:0
2020/10/30 14:09:09.057 20499 20540 Error Unity at System.Activator.CreateInstance (System.Type type, System.Boolean nonPublic) [0x00000] in <00000000000000000000000000000000>:0
2020/10/30 14:09:09.057 20499 20540 Error Unity at UnityEngine.ResourceManagement.Util.LRUCacheAllocationStrategy.New (System.Type type, System.Int32 typeHash) [0x00000] in <00000000000000000000000000000000>:0
2020/10/30 14:09:09.057 20499 20540 Error Unity at UnityEngine.ResourceManagement.ResourceManager.CreateOperation[T] (System.Type actualType, System.Int32 typeHash, System.Int32 operationHash, System.Action`1[T] onDestroyAction) [0x00000] in <00000000000000000000000000000000>:0
2020/10/30 14:09:09.057 20499 20540 Error Unity at UnityEngine.ResourceManagement.Res三、解决方式
1、快速解决方式可以根据对应的添加，可以在 Assets 文件夹中创建 link.xml 文件
第一个是
<linker>
<assembly fullname="XXFramework">
<type fullname="XXFramework.AssetModule.AssetModule" preserve="all" />
<!-- 添加其他需要保留的类型或方法 -->
</assembly>
</linker>第二个是
<linker>
<assembly fullname="Unity.ResourceManager" preserve="all" />
<assembly fullname="Unity.Addressables" preserve="all" />
</linker>2、不过如果添加了如上的代码，还是不行的话，可能还需要给对应的类添加一个默认的无参构造函数
例如：
namespace XXFramework.AssetModule{
public class AssetModule{
private string m_Test;
public AssetModule(){
m_Test = "";
}
}
}3、如果有太多的 MissingMethodException: Default constructor not found for type 报错，可以尝试如下的方式
<linker>
<assembly fullname="XXFramework, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null" preserve="all">
<!--assembly fullname="XXFramework"-->
<type fullname="XXFramework.AssetModule.AssetModule" preserve="all" />
<!-- 添加其他需要保留的类型或方法 -->
</assembly>
</linker>更多 Unity link 相关信息(代码剥离的信息)可参见：Unity - Manual: Managed code stripping