将 JSON 对象转换为实现 IEnumerable 的集合

Question

如何将 JSON 对象转换为实现 IEnumerable 的集合，以便在 foreach 中使用

错误：“foreach 语句无法对 'Attributes' 类型的变量进行操作，因为 'Attributes' 不包含 'GetEnumerator' 的公共定义” 遍历属性的.net代码：

var jsonData  = JsonConvert.DeserializeObject<Rootobject>(json); 
//RootObject  is the class generated from Json using Paste JSON as Classes    
var att = jsonData.AnswerTA.Attributes;
            foreach (var item in att)<-- This is giving error
            {}

部分 JSON 文件：

  {  "FormTitle": "This is Form Title from JSON",  
"TitleQuestion1": "This s the Title of Question 1",  
"TextQuestion1": "1-    This is the text of Quextion umber 1",            "AnswerRadioButton": {    "visibleRB": "true",    "titleRB": "Radio Button Title",
"FieldsetRB": "yes",
"optionRB": [
  {
    "text": "text1",
    "value": "v1",
    "checked": "false"
  },
  {
    "text": "text2",
    "value": "v2",
    "checked": "false"
  },
  {
    "text": "text3",
    "value": "v3",
    "checked": "false"
  },
  {
    "text": "text4",
    "value": "v4",
    "checked": "true"
  },
  {
    "text": "text5",
    "value": "v4",
    "checked": "false"
  }
  ]
 },      "AnswerCheckBox": {     "visibleCB": "true",    "titleCB": "Check box Answer Title",    "FieldsetCB": "yes",    "optionCB": [
  {        "text": "ch text1",        "value": "v1",        "checked": "false"      },      {        "text": "tzxcsdcext2",        "value": "v2",
    "checked": "false"
  },
  {        "text": "text3",        "value": "v3",        "checked": "false"
  },
  {        "text": "text4",        "value": "v4",        "checked": "true"
  }
]},  "AnswerDropDownList": {    "visibleDDl": "true",    "required": "no",    "titleDDL": "Title of Drop Down List ",    "FieldsetDDL": "yes",    "optionDDL": [      {        "text": "Select",        "value": ""      },
  {        "text": "IE",        "value": "IE"      },      {
    "text": "Safari",        "value": "Safari"      },
  {        "text": "Chrome",        "value": "Chrome"
  }    ]  },  "AnswerTB": {    "visibleTB": "true",    "required": "no",
"titleTB": "Title of TB ",    "FieldsetTB": "yes"  },  
"AnswerTA": {
"visibleTA": "true",
"required": "no",
"titleTA": "Title of TA ",
"FieldsetTA": "yes",
"Attributes": {
  "placeholder": "this is the watermark",
  "title": "this is tooltip",
  "maxlength": "10",
  "minlength": "5",
  "required": "yes"
},
"Style": {
  "height": "50px",
  "width" :  "5px"
}

} }

类生成

public class Rootobject{
public string FormTitle { get; set; }
public string TitleQuestion1 { get; set; }
public string TextQuestion1 { get; set; }
public Answerradiobutton AnswerRadioButton { get; set; }
public Answercheckbox AnswerCheckBox { get; set; }
public Answerdropdownlist AnswerDropDownList { get; set; }
public Answertb AnswerTB { get; set; }
public Answerta AnswerTA { get; set; }
}

public class Answerta{
public string visibleTA { get; set; }
public string required { get; set; }
public string titleTA { get; set; }
public string FieldsetTA { get; set; }
public Attributes Attributes { get; set; }
public Style Style { get; set; }
}
public class Attributes{
public string placeholder { get; set; }
public string title { get; set; }
public string maxlength { get; set; }
public string minlength { get; set; }
public string required { get; set; }}

Answer 1

在您的 json 示例中，“属性”不是一个数组。 如果要枚举 Attributes 需要将其定义为数组：

 "Attributes":[ {
   "placeholder": "this is the watermark",
   "title": "this is tooltip",
   "maxlength": "10",
   "minlength": "5",
   "required": "yes"
 },
 { 
   "placeholder": "this is the watermark",
   "title": "this is tooltip",
   "maxlength": "10",
   "minlength": "5",
   "required": "yes"
 } ],

或者，您需要将属性类设为implement IEnumerable interface。

Also, you can enumerate the properties of Attributes by using reflection