ASP.NET Core API中的递归映射-树结构 [英] Recursive mapping in ASP.NET Core API - Tree Structure
问题描述
我正在制作树形结构.结果，我想得到这样的结构:
I'm making a tree structure. As a result, I want to receive such a structure:
[
{
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:
To do this I created a Api endpoint:
[HttpGet]
public async Task<IActionResult> GetTree()
{
var tree = await _treeService.GetTreeAsync();
return Ok(tree);
}
_treeService方法:
_treeService method:
public async Task<IEnumerable<NodeModel>> GetTreeAsync()
{
var tree = await _context.Nodes.ToListAsync();
return _mapper.Map<IEnumerable<NodeModel>>(tree);
}
以下是映射:
CreateMap<Node, NodeModel>();
节点正在映射到NodeModel:
Node is mapping to 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>();
}
}
但是结果是:
[
{
"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": []
}
]
我们可以看到，模型尚未完全映射，但最后在同一行上显示.我该如何解决?
As we can see, the model has not been completely mapped, but on finally the same rows are displayed. How can I fixed this?
PS:对不起，我的英语
PS: sorry for my English
推荐答案
我建议您为 NodeModel中的类.我的意思是 SubNodes 属性使用 NodeModel 类型
I would suggest you to have a NodeModel type for the SubNodes property within the NodeModel class. I mean
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.似乎正是您所需要的.
So that your model class will have only those properties which are supposed to be relevant for an API consumer. And it seems to be exactly what you need.
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