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我想从JSON字符串中选择对象,方法是使用JSONPath表达式和过滤器中嵌入的另一个表达式进行过滤。换句话说,我想过滤JSON数据中其他地方存在的值。如何在另一个JSONPath表达式中使用JSONPath表达式作为过滤器?
例如:
在下面的JSON数据存在$.Item.State.stepId
的值(当前为 “QG2.0”)。我需要一个JSONPath表达式来选择基于此值的值,如下所示:
$..Step[?(@.stepId==$Item.State.stepId)].actionDate
但是,这不会返回任何结果。如果我直接使用字符串(“QG2.0”):
$..Step[?(@.stepId=='QG2.0')].actionDate
它会返回所需的数据。
有什么不对?或者甚至不可能?我的JSON如下:
{
"Item": {
"Common": {
"folio": "PSH-000016020",
"setName": "123-XZ200-1",
"wfId": "Kat1_002",
"wfIssue": "002",
"wfIdIssue": "Kat1_002.002"
},
"State": {
"status": "IN WORK",
"stepId": "QG2.0",
"stepDescription": "Validation"
},
"Participants": {
"Participant": [
{
"role": "PR",
"roleDescription": "Product Responsible",
"loginName": "marc102",
"email": "[email protected]"
}, {
"role": "CR",
"roleDescription": "Chapter Responsible",
"loginName": "uli26819",
"email": "[email protected]"
}
]
},
"Steps": {
"Step": [
{
"stepId": "QG1.0",
"stepTitle": "Preparation",
"actionDate": "2016-06-28T10:28:09",
"actionDueDate": "",
"actionBy_Name": "Marc",
"actionBy_Account": "marc102",
"action": "complete",
"Comment": ""
}, {
"stepId": "QG2.0",
"stepTitle": "Check Requirements",
"actionDate": "2016-08-08T14:17:04",
"actionDueDate": "",
"actionBy_Name": "Uli",
"actionBy_Account": "uli26819",
"action": "complete",
"Comment": ""
}
]
}
}
}
喜布赖恩,感谢您的回答。我想过,但希望能有一个直接的解决方案。 –
好吧,Json.Net毕竟是[开源](https://github.com/JamesNK/Newtonsoft.Json);如果你感觉雄心勃勃,你可以自己实现这个功能。 –