核心 API ASP.NET 树结构中的递归映射

Question

我正在制作一个树形结构。因此，我想收到这样的结构：

[
{
name: 'node1',
subNodes: [
{
name: 'node1-1',
subNodes: [],
},
{
name: 'node1-2',
subNodes: [],
},
],
},
{
name: 'node2',
subNodes: [],
},
{
name: 'node3',
subNodes: [
{
name: 'node3-1',
subNodes: [
{
name: 'node3-1-1',
subNodes: [],
},
{
name: 'node3-1-2',
subNodes: [],
},
],
},
{
name: 'node3-2',
subNodes: [],
}
],
},
];

为此，我创建了一个 API 端点：

[HttpGet]
public async Task<IActionResult> GetTree()
{
var tree = await _treeService.GetTreeAsync();
return Ok(tree);
}

_treeService方法：

public async Task<IEnumerable<NodeModel>> GetTreeAsync()
{
var tree = await _context.Nodes.ToListAsync();
return _mapper.Map<IEnumerable<NodeModel>>(tree);
}

这是映射：

CreateMap<Node, NodeModel>();

Node 正在映射到 NodeModel：

public class NodeModel
{
public string Name { get; set; }
public List<Node> SubNodes { get; set; }
}

和节点实体：

public class Node
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int NodeId { get; private set; }
public string Name { get; set; }
public int? ParentNodeId { get; set; }
[ForeignKey("ParentNodeId")]
public Node ParentNode { get; set; }
public List<Node> SubNodes { get; set; }
public List<Leaf> SubLeaves { get; set; }
public Node()
{
SubNodes = new List<Node>();
SubLeaves = new List<Leaf>();
}
}

但在结果中我收到：

[
{
"name": "Node1",
"subNodes": [
{
"nodeId": 18,
"name": "Node1_SubNode1",
"parentNodeId": 17,
"parentNode": {
"nodeId": 17,
"name": "Node1",
"parentNodeId": null,
"parentNode": null,
"subNodes": [
{
"nodeId": 19,
"name": "Node1_SubNode2",
"parentNodeId": 17,
"subNodes": [],
"subLeaves": []
},
{
"nodeId": 20,
"name": "Node1_SubNode3",
"parentNodeId": 17,
"subNodes": [],
"subLeaves": []
}
],
"subLeaves": []
},
"subNodes": [],
"subLeaves": []
},
{
"nodeId": 19,
"name": "Node1_SubNode2",
"parentNodeId": 17,
"parentNode": {
"nodeId": 17,
"name": "Node1",
"parentNodeId": null,
"parentNode": null,
"subNodes": [
{
"nodeId": 18,
"name": "Node1_SubNode1",
"parentNodeId": 17,
"subNodes": [],
"subLeaves": []
},
{
"nodeId": 20,
"name": "Node1_SubNode3",
"parentNodeId": 17,
"subNodes": [],
"subLeaves": []
}
],
"subLeaves": []
},
"subNodes": [],
"subLeaves": []
},
{
"nodeId": 20,
"name": "Node1_SubNode3",
"parentNodeId": 17,
"parentNode": {
"nodeId": 17,
"name": "Node1",
"parentNodeId": null,
"parentNode": null,
"subNodes": [
{
"nodeId": 18,
"name": "Node1_SubNode1",
"parentNodeId": 17,
"subNodes": [],
"subLeaves": []
},
{
"nodeId": 19,
"name": "Node1_SubNode2",
"parentNodeId": 17,
"subNodes": [],
"subLeaves": []
}
],
"subLeaves": []
},
"subNodes": [],
"subLeaves": []
}
]
},
{
"name": "Node1_SubNode1",
"subNodes": []
},
{
"name": "Node1_SubNode2",
"subNodes": []
},
{
"name": "Node1_SubNode3",
"subNodes": []
}
]

如我们所见，模型尚未完全映射，但最终显示相同的行。我该如何解决这个问题？

PS：对不起我的英语

Answer 1

我建议您在NodeModel类中为SubNodes属性提供一个NodeModel类型。我的意思是

public class NodeModel {
public string Name { get; set; }
public List<NodeModel> SubNodes { get; set; } 
}

这样，您的模型类将仅具有那些应该与 API 使用者相关的属性。这似乎正是您所需要的。