[英]Parse json string using JSON.NET
我在 C# 中有如下字符串。 我需要循環並創建一個 HTML 表 output。 我嘗試使用 JSON.NET 但無法弄清楚如何檢索密鑰(姓名、年齡和工作)。
string data = "{items:[
{'Name':'AAA','Age':'22','Job':'PPP'}
,{'Name':'BBB','Age':'25','Job':'QQQ'}
,{'Name':'CCC','Age':'38','Job':'RRR'}]}";
表格格式為
......................... | Name | Age | Job | ......................... | AAA | 22 | PPP | ......................... | BBBB | 25 | QQQ | ......................... | CCC | 28 | RRR | .........................
任何幫助將不勝感激。
Dave 提供的代碼是這里的理想解決方案.. 但它適用於 .NET 4.0.. 我已將以下代碼與 JSON.NET 一起用於 .NET 3.5
使用 Newtonsoft.Json.Linq;
string jsonString = "{items:[{'Name':'Anz','Age':'29','Job':''},{'Name':'Sanjai','Age':'28','Job':'Developer'},{'Name':'Rajeev','Age':'31','Job':'Designer'}]}";
JObject root = JObject.Parse(jsonString);
JArray items = (JArray)root["items"];
JObject item;
JToken jtoken;
for (int i = 0; i < items.Count; i++) //loop through rows
{
item = (JObject)items[i];
jtoken = item.First;
while (jtoken != null)//loop through columns
{
Response.Write(((JProperty)jtoken).Name.ToString() + " : " + ((JProperty)jtoken).Value.ToString() + "<br />");
jtoken = jtoken.Next;
}
}
您可以使用 .NET 4 的動態類型和內置的 JavaScriptSerializer 來做到這一點。 像這樣的東西,也許:
string json = "{\"items\":[{\"Name\":\"AAA\",\"Age\":\"22\",\"Job\":\"PPP\"},{\"Name\":\"BBB\",\"Age\":\"25\",\"Job\":\"QQQ\"},{\"Name\":\"CCC\",\"Age\":\"38\",\"Job\":\"RRR\"}]}";
var jss = new JavaScriptSerializer();
dynamic data = jss.Deserialize<dynamic>(json);
StringBuilder sb = new StringBuilder();
sb.Append("<table>\n <thead>\n <tr>\n");
// Build the header based on the keys in the
// first data item.
foreach (string key in data["items"][0].Keys) {
sb.AppendFormat(" <th>{0}</th>\n", key);
}
sb.Append(" </tr>\n </thead>\n <tbody>\n");
foreach (Dictionary<string, object> item in data["items"]) {
sb.Append(" <tr>\n");
foreach (string val in item.Values) {
sb.AppendFormat(" <td>{0}</td>\n", val);
}
}
sb.Append(" </tr>\n </tbody>\n</table>");
string myTable = sb.ToString();
最后, myTable
將保存一個如下所示的字符串:
<table>
<thead>
<tr>
<th>Name</th>
<th>Age</th>
<th>Job</th>
</tr>
</thead>
<tbody>
<tr>
<td>AAA</td>
<td>22</td>
<td>PPP</td>
<tr>
<td>BBB</td>
<td>25</td>
<td>QQQ</td>
<tr>
<td>CCC</td>
<td>38</td>
<td>RRR</td>
</tr>
</tbody>
</table>
我沒有測試以下代碼段......希望它會為您指明正確的方向:
var jsreader = new JsonTextReader(new StringReader(stringData));
var json = (JObject)new JsonSerializer().Deserialize(jsreader);
var tableRows = from p in json["items"]
select new
{
Name = (string)p["Name"],
Age = (int)p["Age"],
Job = (string)p["Job"]
};
如果您的密鑰是動態的,我建議直接反序列化為 DataTable:
class SampleData
{
[JsonProperty(PropertyName = "items")]
public System.Data.DataTable Items { get; set; }
}
public void DerializeTable()
{
const string json = @"{items:["
+ @"{""Name"":""AAA"",""Age"":""22"",""Job"":""PPP""},"
+ @"{""Name"":""BBB"",""Age"":""25"",""Job"":""QQQ""},"
+ @"{""Name"":""CCC"",""Age"":""38"",""Job"":""RRR""}]}";
var sampleData = JsonConvert.DeserializeObject<SampleData>(json);
var table = sampleData.Items;
// write tab delimited table without knowing column names
var line = string.Empty;
foreach (DataColumn column in table.Columns)
line += column.ColumnName + "\t";
Console.WriteLine(line);
foreach (DataRow row in table.Rows)
{
line = string.Empty;
foreach (DataColumn column in table.Columns)
line += row[column] + "\t";
Console.WriteLine(line);
}
// Name Age Job
// AAA 22 PPP
// BBB 25 QQQ
// CCC 38 RRR
}
反序列化后,您可以動態確定 DataTable 列名稱和類型。
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