如何在 C# 中使用嵌套的 json 对象
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【中文标题】如何在 C# 中使用嵌套的 json 对象【英文标题】：how to work with nested json object in c# 【发布时间】：2021-12-18 08:08:57 【问题描述】：api 返回嵌套的 json，我不知道从中检索数据并将其映射到我的模型。我想从嵌套中检索数据，但不确定如何使用索引和值来执行此操作。提前致谢。
public class MikesExcelModel
//public int id;
//public object AuthorizingManagerId;
public string Name;
//public DateTime UpdateDate;
public string Phone;
public string Email;
public class MikesExcelResults
public List<MikesExcelModel> value = new List<MikesExcelModel>();
public List<MikesExcelModel> GetExcel()
using (HttpClient client = new HttpClient())
addToken(client);
var result = client.GetAsync("https://graph.microsoft.com/beta/sites/ucfdev.sharepoint.com,4c319763-130d-4ee1-bc1f-72543da0a847,8a2f59f4-9d56-4aec-be21-33d0347293d1/drives/b!Y5cxTA0T4U68H3JUPaCoR_RZL4pWnexKviEz0DRyk9HjXtfo70gjRbH706GdwO5m/items/01HA4SXKSESD3RW3UYPNCZ2OHQAEWWDTKH/workbook/worksheets('sheet1')/tables(%27%7B079215E2-A6D7-4CC2-AB1E-9AC38F36D1CC%7D%27)/rows").Result;
if (result.IsSuccessStatusCode)
var responseContent = result.Content;
// by calling .Result you are synchronously reading the result
string responseString = responseContent.ReadAsStringAsync().Result;
javascriptSerializer serialiser = new JavaScriptSerializer();
// dynamic apiResult = serialiser.DeserializeObject(responseString);
return Utilities.DeserializeObject<MikesExcelResults>(result.Content.ReadAsStringAsync().Result).value;
else
throw new Exception("Couldn't get excel datas.");
api返回的数据如下：
"@odata.context": "https://graph.microsoft.com/beta/$metadata#sites('ucfdev.sharepoint.com%2C4c319763-130d-4ee1-bc1f-72543da0a847%2C8a2f59f4-9d56-4aec-be21-33d0347293d1')/drives('b%21Y5cxTA0T4U68H3JUPaCoR_RZL4pWnexKviEz0DRyk9HjXtfo70gjRbH706GdwO5m')/items('01HA4SXKSESD3RW3UYPNCZ2OHQAEWWDTKH')/workbook/worksheets('sheet1')/tables('%7B079215E2-A6D7-4CC2-AB1E-9AC38F36D1CC%7D')/rows",
"value": [
"@odata.id": "/sites('ucfdev.sharepoint.com%2C4c319763-130d-4ee1-bc1f-72543da0a847%2C8a2f59f4-9d56-4aec-be21-33d0347293d1')/drives('b%21Y5cxTA0T4U68H3JUPaCoR_RZL4pWnexKviEz0DRyk9HjXtfo70gjRbH706GdwO5m')/items('01HA4SXKSESD3RW3UYPNCZ2OHQAEWWDTKH')/workbook/worksheets(%27%7B00000000-0001-0000-0000-000000000000%7D%27)/tables(%27%7B079215E2-A6D7-4CC2-AB1E-9AC38F36D1CC%7D%27)/rows/itemAt(index=0)",
"index": 0,
"values": [
[
"Mike Callahan",
"407-266-1431",
"MTC@ucf.edu"
]
]
,
"@odata.id": "/sites('ucfdev.sharepoint.com%2C4c319763-130d-4ee1-bc1f-72543da0a847%2C8a2f59f4-9d56-4aec-be21-33d0347293d1')/drives('b%21Y5cxTA0T4U68H3JUPaCoR_RZL4pWnexKviEz0DRyk9HjXtfo70gjRbH706GdwO5m')/items('01HA4SXKSESD3RW3UYPNCZ2OHQAEWWDTKH')/workbook/worksheets(%27%7B00000000-0001-0000-0000-000000000000%7D%27)/tables(%27%7B079215E2-A6D7-4CC2-AB1E-9AC38F36D1CC%7D%27)/rows/itemAt(index=1)",
"index": 1,
"values": [
[
"Michael Callahan",
"407-823-3455",
"mtcallah@ucf.edu"
]
]
,
"@odata.id": "/sites('ucfdev.sharepoint.com%2C4c319763-130d-4ee1-bc1f-72543da0a847%2C8a2f59f4-9d56-4aec-be21-33d0347293d1')/drives('b%21Y5cxTA0T4U68H3JUPaCoR_RZL4pWnexKviEz0DRyk9HjXtfo70gjRbH706GdwO5m')/items('01HA4SXKSESD3RW3UYPNCZ2OHQAEWWDTKH')/workbook/worksheets(%27%7B00000000-0001-0000-0000-000000000000%7D%27)/tables(%27%7B079215E2-A6D7-4CC2-AB1E-9AC38F36D1CC%7D%27)/rows/itemAt(index=2)",
"index": 2,
"values": [
[
"cvcfcv",
"zVCCvc",
"cvvvvb"
]
]
]
【问题讨论】：
看起来MikesExcelModel 应该只有 int index 和 List<string> values 字段。不清楚其他字段NamePhone和Email应该如何映射，当然序列化器不知道
【参考方案1】：
可能是使用Newtonsoft.Json 库提取 JSON 数据的传统方式。
-
将
jsonData 转换为JObject（通过JObject.Parse）。
获取一级value。
获取二级values。
扁平化二级values。
来自
[[["Mike Callahan", "407-266-1431", "MTC@ucf.edu"], ...]]
到
[["Mike Callahan", "407-266-1431", "MTC@ucf.edu"], ...]
-
将
flattenChildrenValues 转换为List<MikesExcelModel>。
将List<MikesExcelModel> 添加到results.value
using System;
using Newtonsoft.Json.Linq;
using System.Collections.Generic;
using System.Linq;
var jsonData = @"
""@odata.context"": ""https://graph.microsoft.com/beta/$metadata#sites('ucfdev.sharepoint.com%2C4c319763-130d-4ee1-bc1f-72543da0a847%2C8a2f59f4-9d56-4aec-be21-33d0347293d1')/drives('b%21Y5cxTA0T4U68H3JUPaCoR_RZL4pWnexKviEz0DRyk9HjXtfo70gjRbH706GdwO5m')/items('01HA4SXKSESD3RW3UYPNCZ2OHQAEWWDTKH')/workbook/worksheets('sheet1')/tables('%7B079215E2-A6D7-4CC2-AB1E-9AC38F36D1CC%7D')/rows"",
""value"": [
""@odata.id"": ""/sites('ucfdev.sharepoint.com%2C4c319763-130d-4ee1-bc1f-72543da0a847%2C8a2f59f4-9d56-4aec-be21-33d0347293d1')/drives('b%21Y5cxTA0T4U68H3JUPaCoR_RZL4pWnexKviEz0DRyk9HjXtfo70gjRbH706GdwO5m')/items('01HA4SXKSESD3RW3UYPNCZ2OHQAEWWDTKH')/workbook/worksheets(%27%7B00000000-0001-0000-0000-000000000000%7D%27)/tables(%27%7B079215E2-A6D7-4CC2-AB1E-9AC38F36D1CC%7D%27)/rows/itemAt(index=0)"",
""index"": 0,
""values"": [
[
""Mike Callahan"",
""407-266-1431"",
""MTC@ucf.edu""
]
]
,
""@odata.id"": ""/sites('ucfdev.sharepoint.com%2C4c319763-130d-4ee1-bc1f-72543da0a847%2C8a2f59f4-9d56-4aec-be21-33d0347293d1')/drives('b%21Y5cxTA0T4U68H3JUPaCoR_RZL4pWnexKviEz0DRyk9HjXtfo70gjRbH706GdwO5m')/items('01HA4SXKSESD3RW3UYPNCZ2OHQAEWWDTKH')/workbook/worksheets(%27%7B00000000-0001-0000-0000-000000000000%7D%27)/tables(%27%7B079215E2-A6D7-4CC2-AB1E-9AC38F36D1CC%7D%27)/rows/itemAt(index=1)"",
""index"": 1,
""values"": [
[
""Michael Callahan"",
""407-823-3455"",
""mtcallah@ucf.edu""
]
]
,
""@odata.id"": ""/sites('ucfdev.sharepoint.com%2C4c319763-130d-4ee1-bc1f-72543da0a847%2C8a2f59f4-9d56-4aec-be21-33d0347293d1')/drives('b%21Y5cxTA0T4U68H3JUPaCoR_RZL4pWnexKviEz0DRyk9HjXtfo70gjRbH706GdwO5m')/items('01HA4SXKSESD3RW3UYPNCZ2OHQAEWWDTKH')/workbook/worksheets(%27%7B00000000-0001-0000-0000-000000000000%7D%27)/tables(%27%7B079215E2-A6D7-4CC2-AB1E-9AC38F36D1CC%7D%27)/rows/itemAt(index=2)"",
""index"": 2,
""values"": [
[
""cvcfcv"",
""zVCCvc"",
""cvvvvb""
]
]
]
";
var jsonObj = JObject.Parse(jsonData);
// Get first-level value
JArray jsonValue = jsonObj["value"] as JArray;
// Get second-level values
var childrenValues = jsonValue.Children<JObject>()["values"];
// Flatten second-level values
var flattenChildrenValues = childrenValues.Values<JArray>() as IEnumerable<JArray>;
// Read flattenChildrenValues to List<MikesExcelModel>
List<MikesExcelModel> excelModels = flattenChildrenValues
.Select(x => new MikesExcelModel
Name = x[0].ToString(),
Phone = x[1].ToString(),
Email = x[2].ToString()
)
.ToList();
// Add List<MikesExcelModel> to results.value
MikesExcelResults results = new MikesExcelResults();
results.value.AddRange(excelModels);
foreach (var model in results.value)
Console.WriteLine(String.Format("Name: 0, Phone: 1, Email: 2", model.Name, model.Phone, model.Email));
Sample program
【讨论】：
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