错误：无法访问 Newtonsoft.Json.Linq.JValue 上的子值

Question

我如何访问下面的对象类型值，该值作为请求正文来自 http 触发函数中另一个函数应用程序的数据工厂输出。 现在我需要在 http 触发函数中对这些输出执行一些操作。 { "functionName": "GoogleAuth", “方法”：“发布”， “标题”：{}， “身体”： { "响应": "[{"id":"hjk","name":"abc","description":"hki","brand":"Birds Eye","ean":"125","mediaStorageKey ":"124","maxQuantity":6,"price":1.75,"size":224.0,"sizeUnits":"Grams"}]", "effectiveIntegrationRuntime": "DefaultIntegrationRuntime (西欧)", “执行持续时间”：0， “持续时间队列”：{ “集成运行时间队列”：0 }, “计费参考”：{ "activityType": "外部活动", “计费持续时间”：[ { “meterType”：“AzureIR”， “持续时间”：0.016666666666666666， “单位”：“小时” } ] } } }

我正在尝试这样访问它，但显示错误。

string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
dynamic body = JsonConvert.DeserializeObject(requestBody);
dynamic data = body["Response"];
product.OfferId = string.IsNullOrEmpty(Convert.ToString(data[0]["id"])) ? " " :Convert.ToString(data[0]["id"]);

错误：无法访问 Newtonsoft.Json.Linq.JValue 上的子值。

Answer 1

"Response": "[{\"id\":\"cc4324be-fa0e-424c-97e9-97644752f609\",\"name\":\"Seriously Tasty Pasties Traditional\",\"description\":\"Seriously Tasty Traditional Beef and Vegetable Pasty 199G\",\"brand\":\"Seriously Tasty\",\"ean\":\"5011187110319\",\"mediaStorageKey\":\"https://rt-1-dv-euw-retailapis-end-01.azureedge.net/5011187110319_1_1024x1024_20210325.png\",\"maxQuantity\":6,\"price\":0.55,\"size\":null,\"sizeUnits\":null}]

首先请设置断点检查requestBody的值，因为上面的值不是有效的json。您可以搜索“Json Parse Online”并使用在线工具进行验证。

如下更改响应后（删除 '[' 之前和 ']' 之后的 '"'），您的代码运行良好

string requestBody = "{\"Response\": [{\"id\":\"cc4324be-fa0e-424c-97e9-97644752f609\",\"name\":\"Seriously Tasty Pasties Traditional\",\"description\":\"Seriously Tasty Traditional Beef and Vegetable Pasty 199G\",\"brand\":\"Seriously Tasty\",\"ean\":\"5011187110319\",\"mediaStorageKey\":\"https://rt-1-dv-euw-retailapis-end-01.azureedge.net/5011187110319_1_1024x1024_20210325.png\",\"maxQuantity\":6,\"price\":0.55,\"size\":null,\"sizeUnits\":null}]}";
dynamic body = Newtonsoft.Json.JsonConvert.DeserializeObject(requestBody);
dynamic  data = body["Response"];
                     
var  offerId = string.IsNullOrEmpty(Convert.ToString(data[0]["id"])) ? " " : Convert.ToString(data[0]["id"]); //output: cc4324be-fa0e-424c-97e9-97644752f609

其次，从你的评论来看，动态数据值为：

[{"id":"b","name":"Seriously Tasty Pasties Traditional","description":"Seriously Tasty Traditional Beef and Vegetable Pasty 199G","brand":"Seriously Tasty","ean":"6","mediaStorageKey":"7fb","maxQuantity":6,"price":0.55,"size":null,"sizeUnits":null}] 

在这种情况下，您可以将data 值转换为字符串，然后使用JsonConvert.DeserializeObject() 转换字符串值，然后就可以得到id 值。代码如下：

string requestBody = "{\"Response\": [{\"id\":\"cc4324be-fa0e-424c-97e9-97644752f609\",\"name\":\"Seriously Tasty Pasties Traditional\",\"description\":\"Seriously Tasty Traditional Beef and Vegetable Pasty 199G\",\"brand\":\"Seriously Tasty\",\"ean\":\"5011187110319\",\"mediaStorageKey\":\"https://rt-1-dv-euw-retailapis-end-01.azureedge.net/5011187110319_1_1024x1024_20210325.png\",\"maxQuantity\":6,\"price\":0.55,\"size\":null,\"sizeUnits\":null}]}";
dynamic body = Newtonsoft.Json.JsonConvert.DeserializeObject(requestBody);
dynamic  data = body["Response"];
                     
var  offerId = string.IsNullOrEmpty(Convert.ToString(data[0]["id"])) ? " " : Convert.ToString(data[0]["id"]); //output: cc4324be-fa0e-424c-97e9-97644752f609

var datastr = Convert.ToString(data);

var datavalue = "[{\"id\":\"cc4324be-fa0e-424c-97e9-97644752f609\",\"name\":\"Seriously Tasty Pasties Traditional\",\"description\":\"Seriously Tasty Traditional Beef and Vegetable Pasty 199G\",\"brand\":\"Seriously Tasty\",\"ean\":\"5011187110319\",\"mediaStorageKey\":\"https://rt-1-dv-euw-retailapis-end-01.azureedge.net/5011187110319_1_1024x1024_20210325.png\",\"maxQuantity\":6,\"price\":0.55,\"size\":null,\"sizeUnits\":null}]";
dynamic databody = Newtonsoft.Json.JsonConvert.DeserializeObject(datastr); //for test purpose, change datastr to datavalue.

var Id = string.IsNullOrEmpty(Convert.ToString(databody[0]["id"])) ? " " : Convert.ToString(databody[0]["id"]); //output: cc4324be-fa0e-424c-97e9-97644752f609

调试截图如下：