feat: initialize Evergreen Health backend
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// Admin.NET 项目的版权、商标、专利和其他相关权利均受相应法律法规的保护。使用本项目应遵守相关法律法规和许可证的要求。
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//
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// 本项目主要遵循 MIT 许可证和 Apache 许可证(版本 2.0)进行分发和使用。许可证位于源代码树根目录中的 LICENSE-MIT 和 LICENSE-APACHE 文件。
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//
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// 不得利用本项目从事危害国家安全、扰乱社会秩序、侵犯他人合法权益等法律法规禁止的活动!任何基于本项目二次开发而产生的一切法律纠纷和责任,我们不承担任何责任!
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namespace Admin.NET.Core;
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/// <summary>
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/// 数据集合拓展类
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/// </summary>
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public static class EnumerableExtension
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{
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private static readonly ConcurrentDictionary<string, PropertyInfo> PropertyCache = new();
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/// <summary>
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/// 查询有父子关系的数据集
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/// </summary>
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/// <param name="list">数据集</param>
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/// <param name="idExpression">主键ID字段</param>
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/// <param name="parentIdExpression">父级字段</param>
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/// <param name="topParentIdValue">顶级节点父级字段值</param>
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/// <param name="isContainOneself">是否包含顶级节点本身</param>
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/// <returns></returns>
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public static IEnumerable<T> ToChildList<T, P>(this IEnumerable<T> list,
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Expression<Func<T, P>> idExpression,
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Expression<Func<T, P>> parentIdExpression,
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object topParentIdValue,
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bool isContainOneself = true)
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{
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if (list == null || !list.Any()) return Enumerable.Empty<T>();
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var propId = GetPropertyInfo(idExpression);
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var propParentId = GetPropertyInfo(parentIdExpression);
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// 查找所有顶级节点
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var topNodes = list.Where(item => Equals(propId.GetValue(item), topParentIdValue)).ToList();
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return TraverseHierarchy(list, propId, propParentId, topNodes, isContainOneself);
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}
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/// <summary>
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/// 查询有父子关系的数据集
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/// </summary>
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/// <param name="list">数据集</param>
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/// <param name="idExpression">主键ID字段</param>
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/// <param name="parentIdExpression">父级字段</param>
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/// <param name="topLevelPredicate">顶级节点的选择条件</param>
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/// <param name="isContainOneself">是否包含顶级节点本身</param>
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/// <returns></returns>
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public static IEnumerable<T> ToChildList<T, P>(this IEnumerable<T> list,
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Expression<Func<T, P>> idExpression,
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Expression<Func<T, P>> parentIdExpression,
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Expression<Func<T, bool>> topLevelPredicate,
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bool isContainOneself = true)
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{
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if (list == null || !list.Any()) return Enumerable.Empty<T>();
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// 获取顶级节点
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var topNodes = list.Where(topLevelPredicate.Compile()).ToList();
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if (!topNodes.Any()) return Enumerable.Empty<T>();
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var idPropertyInfo = GetPropertyInfo(idExpression);
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var parentPropertyInfo = GetPropertyInfo(parentIdExpression);
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return TraverseHierarchy(list, idPropertyInfo, parentPropertyInfo, topNodes, isContainOneself);
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}
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/// <summary>
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/// 辅助方法,从表达式中提取属性信息并使用临时缓存
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/// </summary>
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private static PropertyInfo GetPropertyInfo<T, P>(Expression<Func<T, P>> expression)
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{
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// 使用 ConcurrentDictionary 确保线程安全
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return PropertyCache.GetOrAdd(typeof(T).FullName + "." + ((MemberExpression)expression.Body).Member.Name, k =>
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{
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if (expression.Body is UnaryExpression { Operand: MemberExpression member }) return (PropertyInfo)member.Member;
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if (expression.Body is MemberExpression memberExpression) return (PropertyInfo)memberExpression.Member;
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throw Oops.Oh("表达式必须是一个属性访问: " + expression);
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});
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}
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/// <summary>
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/// 使用队列遍历层级结构
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/// </summary>
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private static IEnumerable<T> TraverseHierarchy<T>(IEnumerable<T> list,
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PropertyInfo idPropertyInfo,
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PropertyInfo parentPropertyInfo,
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List<T> topNodes,
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bool isContainOneself)
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{
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var queue = new Queue<T>(topNodes);
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var result = new HashSet<T>(topNodes);
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while (queue.Count > 0)
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{
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var currentNode = queue.Dequeue();
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var children = list.Where(item => Equals(parentPropertyInfo.GetValue(item), idPropertyInfo.GetValue(currentNode))).ToList();
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children.Where(child => result.Add(child)).ForEach(child => queue.Enqueue(child));
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}
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if (isContainOneself) return result;
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// 如果不需要包含顶级节点本身,则移除它们
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topNodes.ForEach(e => result.Remove(e));
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return result;
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}
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}
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