C# 递归实现tree view(树结构)

1.声明树结构model类

public class TreeModel{public string ID { set; get; }public string PARENTID { set; get; }public string NAME { set; get; }public List<TreeModel> TREECHILDREN { set; get; }}

2.利用反射将泛型list转换为树形结构类

/// <summary>/// 公用递归(反射转换List)/// </summary>/// <typeparam name="T"></typeparam>/// <param name="allList">数据列表</param>/// <param name="parentId">父级ID</param>/// <param name="idField">id字段名称</param>/// <param name="parentIdField">父级id字段名称</param>/// <param name="nameField">name字段名称</param>/// <returns></returns>public List<TreeModel> ConversionList<T>(List<T> allList, string parentId, string idField, string parentIdField, string nameField){List<TreeModel> list = new List<TreeModel>();TreeModel model = null;foreach (var item in allList){model = new TreeModel();foreach (System.Reflection.PropertyInfo p in item.GetType().GetProperties()){if (p.Name == idField){model.ID = p.GetValue(item)?.ToString();//判空}if (p.Name == parentIdField){model.PARENTID = p.GetValue(item)?.ToString();//判空}if (p.Name == nameField){model.NAME = p.GetValue(item)?.ToString();//判空}}list.Add(model);}return OperationParentData(list, parentId);}

3.递归

/// <summary>/// 公用递归(处理递归最父级数据)/// </summary>/// <param name="treeDataList">树形列表数据</param>/// <param name="parentId">父级Id</param>/// <returns></returns>public List<TreeModel> OperationParentData(List<TreeModel> treeDataList, string parentId){var data = treeDataList.Where(x => x.PARENTID == parentId);List<TreeModel> list = new List<TreeModel>();foreach (var item in data){OperationChildData(treeDataList, item);list.Add(item);}return list;}/// <summary>/// 公用递归(递归子级数据)/// </summary>/// <param name="treeDataList">树形列表数据</param>/// <param name="parentItem">父级model</param>public void OperationChildData(List<TreeModel> treeDataList, TreeModel parentItem){var subItems = treeDataList.Where(ee => ee.PARENTID == parentItem.ID).ToList();if (subItems.Count != 0){parentItem.TREECHILDREN = new List<TreeModel>();parentItem.TREECHILDREN.AddRange(subItems);foreach (var subItem in subItems){OperationChildData(treeDataList, subItem);}}}

/// <summary>/// 公用递归(递归子级数据)/// </summary>/// <param name="treeDataList">树形列表数据</param>/// <param name="parentItem">父级model</param>public void OperationChildData(List<TreeModel> treeDataList, TreeModel parentItem){var subItems = treeDataList.Where(ee => ee.PARENTID == parentItem.ID).ToList();if (subItems.Count != 0){parentItem.TREECHILDREN = new List<TreeModel>();parentItem.TREECHILDREN.AddRange(subItems);foreach (var subItem in subItems){OperationChildData(treeDataList, subItem);}}}

示例：

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C# 递归实现tree view(树结构)

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