通過c＃中的json對象進行迭代

Question

我想創建一個循環來檢查我的Json對象上的條件。 我正在尋找一種迭代我的json對象的方法：

JSON：

{"tasks":[
        {
            "id":-1,
            "name":"Gantt editor",
            "code":"",
            "level":0,
            "status":"STATUS_ACTIVE",
            "start":1372608000000,
            "duration":21,
            "end":1375113599999,
            "startIsMilestone":true,
            "endIsMilestone":false,
            "collapsed":false,
            "assigs":[]
        },
        {
            "id":"tmp_fk1372575559620",
            "name":"release",
            "code":"",
            "level":1,
            "status":"STATUS_ACTIVE",
            "start":1372608000000,
            "duration":1,
            "end":1372694399999,
            "startIsMilestone":false,
            "endIsMilestone":false,
            "collapsed":false,
            "assigs":[]
        }
        ],       // number of tasks may vary
"selectedRow":8,
"deletedTaskIds":[],
"resources":
    [
        {
        "id":"tmp_1",
        "name":"Resource 1"
        }
    ],
"roles":[
        {
            "id":"tmp_1",
            "name":"Project Manager"
        }
        ],
"canWrite":true,
"canWriteOnParent":true
}

我知道如何映射它，所以我假設我映射了Task和RootObject，如下所示：

public class Task
{
    public object id { get; set; }
    public string name { get; set; }
    public string code { get; set; }
    public int level { get; set; }
    public string status { get; set; }
    public object start { get; set; }
    public int duration { get; set; }
    public object end { get; set; }
    public bool startIsMilestone { get; set; }
    public bool endIsMilestone { get; set; }
    public bool collapsed { get; set; }
    public List<object> assigs { get; set; }
}
public class RootObject
{
    public List<Task> tasks { get; set; }
    public int selectedRow { get; set; }
    public List<object> deletedTaskIds { get; set; }
    public List<Resource> resources { get; set; }
    public List<Role> roles { get; set; }
    public bool canWrite { get; set; }
    public bool canWriteOnParent { get; set; }
} // And etc .....

我知道如何手動檢查任務，例如第一個

Rootobject project = JsonConvert.DeserializeObject<Rootobject>(jsonString);
    Task task = project.tasks.FirstOrDefault(t => t.id == "-1");
    decimal start = Convert.ToDecimal(task.start);
    decimal end = Convert.ToDecimal(task.end);
    decimal prog = Convert.ToDecimal(task.progress);

然后使用task來檢查它的所有屬性

我該如何檢查所有任務？

提前致謝 ！

Answer 1

如果要遍歷所有任務，可以使用：

foreach (var task in project.tasks)
{
    // do some stuff
}

或者您可以使用LINQ過濾它們，如下所示：

foreach (var task in project.tasks.Where(t => t.id == "-1"))
{
    // do some stuff
}

這與您的示例基本相同，只是區別在於Where返回IEnumerable，而不僅僅是您的示例中的FirstOrDefault之類的任務。

Answer 2

在json.net中使用JArray和JObject

這里有一些很好的樣品

http://james.newtonking.com/projects/json/help/index.html?topic=html/QueryingLINQtoJSON.htm

http://james.newtonking.com/projects/json/help/index.html?topic=html/T_Newtonsoft_Json_Linq_JArray.htm