/// <summary>
/// 递归查找父节点
/// </summary>
/// <param name="dependencyTreeModel"></param>
/// <param name="type"></param>
/// <returns></returns>
private static DependencyTreeModel GetDependencyTree(DependencyTreeModel dependencyTreeModel, Type type)
{
if (dependencyTreeModel == null)
{
return(null);
}
if (dependencyTreeModel.Dependency.Type == type)
{
return(dependencyTreeModel);
}
if (dependencyTreeModel.ParentDependencyTree == null)
{
return(null);
}
return(GetDependencyTree(dependencyTreeModel.ParentDependencyTree, type));
}
/// <summary>
/// 分析依赖树
/// </summary>
/// <param name="dependencyTreeModel"></param>
private static void AnalysisDependencyTree(DependencyTreeModel dependencyTreeModel)
{
foreach (var memberInfo in dependencyTreeModel.Dependency.Type.GetMembers(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
{
//非属性和字段
if (memberInfo.MemberType != MemberTypes.Field && memberInfo.MemberType != MemberTypes.Property)
{
continue;
}
//判断当前属性是否具有DependencyInjectionAttribute特性
var customeAttribute = memberInfo.GetCustomAttribute(typeof(AutowiredAttribute), false);
if (customeAttribute == null)
{
continue;
}
//等待注入的类型
var injectionType = ((AutowiredAttribute)customeAttribute).RealType ?? memberInfo.GetRealType();
//自己依赖自己
if (injectionType == dependencyTreeModel.Dependency.Type)
{
throw new UnableResolveDependencyException($"Unable to resolve dependency {injectionType.FullName}.");
}
//从父树查找是否已经有依赖
var parentDependencyTreeModel = GetDependencyTree(dependencyTreeModel.ParentDependencyTree, injectionType);
if (parentDependencyTreeModel != null)
{
//查找父树的依赖是否是Transient模式,如是则此循环依赖无法支持
if (parentDependencyTreeModel.Dependency.Lifetime == Lifetime.Transient)
{
throw new UnableResolveDependencyException($"Unable to resolve dependency {injectionType.FullName}. {parentDependencyTreeModel.Dependency.Type.FullName} DependencyInjectionMode should not be Transient when using circular dependencies");
}
continue;
}
//查看是否加入到了容器
var dependency = container.FirstOrDefault(item => item.Type == injectionType);
if (dependency == null)
{
//虽然未找到实例,但是可能通过IServiceCollection加入到了容器
continue;
}
var nextDependencyInjectionTreeModel = new DependencyTreeModel {
Dependency = dependency,
ParentDependencyTree = dependencyTreeModel
};
AnalysisDependencyTree(nextDependencyInjectionTreeModel);
}
}