我正在尝试将 .yaml 文件读入我的 C# 应用程序,并将数据存储在自定义类中。我正在尝试使用 nuget 中的
YamlDotNet
。
该文件粘贴在下面,我的代码(来自 YamlDotNet 示例)是:
public void readMapFile(string filepath)
{
// Setup the input
var input = new StringReader(filepath);
// Load the stream
var yaml = new YamlStream();
yaml.Load(input);
// Examine the stream
var mapping = (YamlMappingNode)yaml.Documents[0].RootNode;
foreach (var entry in mapping.Children)
{
Console.WriteLine(((YamlScalarNode)entry.Key).Value);
}
// List all the items
var items = (YamlSequenceNode)mapping.Children[new YamlScalarNode("aruco_bc_markers")];
}
然而,这会崩溃,给我错误:
未处理的异常:System.InvalidCastException:无法将类型“YamlDotNet.RepresentationModel.YamlScalarNode”的对象转换为类型“YamlDotNet.RepresentationModel.YamlMappingNode”。`
我是这种文件读取的新手,我被困住了。
我哪里出错了?
%YAML:1.0
---
aruco_bc_dict: ARUCO
aruco_bc_nmarkers: 24
aruco_bc_mInfoType: 1
aruco_bc_markers:
- { id:0, corners:[ [ -1.2928584814071655e+00, 8.1286805868148804e-01,
-1.6458697617053986e-01 ], [ -1.1746160984039307e+00,
8.1223398447036743e-01, -1.4413379132747650e-01 ], [
-1.1754947900772095e+00, 6.9224494695663452e-01,
-1.4277370274066925e-01 ], [ -1.2937371730804443e+00,
6.9287902116775513e-01, -1.6322688758373260e-01 ] ] }
- { id:1, corners:[ [ -7.9834830760955811e-01, 8.1106305122375488e-01,
-9.9434338510036469e-02 ], [ -6.7920655012130737e-01,
8.1078404188156128e-01, -8.5110619664192200e-02 ], [
-6.7947661876678467e-01, 6.9078433513641357e-01,
-8.5201270878314972e-02 ], [ -7.9861837625503540e-01,
6.9106334447860718e-01, -9.9524989724159241e-02 ] ] }
- { id:2, corners:[ [ -3.0384334921836853e-01, 8.1034839153289795e-01,
-3.8991540670394897e-02 ], [ -1.8399941921234131e-01,
8.1008774042129517e-01, -3.2878942787647247e-02 ], [
-1.8429389595985413e-01, 6.9008994102478027e-01,
-3.2222278416156769e-02 ], [ -3.0413782596588135e-01,
6.9035059213638306e-01, -3.8334876298904419e-02 ] ] }
第一个问题是您正在将文件名本身读取为 yaml 文档,而不是文件内容。使用
StreamReader
代替 StringReader
:
using (var reader = new StreamReader(filepath)) {
// Load the stream
var yaml = new YamlStream();
yaml.Load(reader);
// the rest
}
然后,YAML 1.0 非常旧,因此解析器似乎不理解
%YAML: 1.0
指令(在更高版本中,“:”已从此指令中删除)。因此,将其删除并“---”(不需要)。您可以将其更改为 %YAML 1.1
,而不是删除(没有“:”,版本 1.1、1.0 被解析器拒绝)。
那么,意图很重要。此版本(请注意“id”和“corners”中“:”后面的空格)将使用您的代码进行解析,不会出现问题:
%YAML 1.1
---
aruco_bc_dict: ARUCO
aruco_bc_nmarkers: 24
aruco_bc_mInfoType: 1
aruco_bc_markers:
- { id: 0, corners: [ [ -1.2928584814071655e+00, 8.1286805868148804e-01,
-1.6458697617053986e-01 ], [ -1.1746160984039307e+00,
8.1223398447036743e-01, -1.4413379132747650e-01 ], [
-1.1754947900772095e+00, 6.9224494695663452e-01,
-1.4277370274066925e-01 ], [ -1.2937371730804443e+00,
6.9287902116775513e-01, -1.6322688758373260e-01 ] ] }
- { id: 1, corners: [ [ -7.9834830760955811e-01, 8.1106305122375488e-01,
-9.9434338510036469e-02 ], [ -6.7920655012130737e-01,
8.1078404188156128e-01, -8.5110619664192200e-02 ], [
-6.7947661876678467e-01, 6.9078433513641357e-01,
-8.5201270878314972e-02 ], [ -7.9861837625503540e-01,
6.9106334447860718e-01, -9.9524989724159241e-02 ] ] }
- { id: 2, corners: [ [ -3.0384334921836853e-01, 8.1034839153289795e-01,
-3.8991540670394897e-02 ], [ -1.8399941921234131e-01,
8.1008774042129517e-01, -3.2878942787647247e-02 ], [
-1.8429389595985413e-01, 6.9008994102478027e-01,
-3.2222278416156769e-02 ], [ -3.0413782596588135e-01,
6.9035059213638306e-01, -3.8334876298904419e-02 ] ] }