如何过滤 JSON 字符串

Question

在我的应用程序方法中，使用名为GetAllProvince()的方法填充JSON字符串如下，请注意GetAllProvince()是web方法

public string GetAllProvince()
{
    NccEntity nccEnti = getLtsLobbyInstance();
    DataTable dt = nccEnti.GetAllBranchesAndRegions();
    JavaScriptSerializer jsSerializer = new System.Web.Script.Serialization.JavaScriptSerializer();
    return jsSerializer.Serialize(dt.Rows.Cast<DataRow>().GroupBy(row => row["RegionId"], row => row, (key, values) => new ProvinceWithBranches
    {
        Value = key.ToString(),
        Province = values.Select(row => row["RegionName"].ToString()).FirstOrDefault(),
        Branches = values.Select(row => new BranchItem
        {
            Value = row["BranchId"].ToString(),
            Province = row["BranchName"].ToString(),
            IsValid = row["IsTestBranch"].ToString()
        })
    }));
}

类名为ProvinceWithBranches

public class ProvinceWithBranches
{
    public string Value;
    public string Province;
    public IEnumerable<BranchItem> Branches;
}

类名为BranchItem

public class BranchItem
{
    public string Value;
    public string Province;
    public string IsValid;
}

上述生成JSON字符串的方法如下，

[
  {
    "Value": "21",
    "Province": "Default",
    "Branches": [
      {"Value": "1108", "Province": "davie", "IsValid": "False"},
      {"Value": "1107", "Province": "Ab area109", "IsValid": "False"},
      {"Value": "1105", "Province": "Hollywood", "IsValid":"False"},
      {"Value": "1105", "Province": "Ft. Lauderdale", "IsValid":"False"}
    ]
  },
  {
    "Value": "17",
    "Province": "East",
    "Branches": [
      {"Value": "212", "Province": "area109", "IsValid": "False"},
      {"Value": "219", "Province": "lauderdale", "IsValid": "False"}
    ]
  },
  {
    "Value": "24",
    "Province": "East11",
    "Branches": [
      {"Value": "211", "Province": "area108", "IsValid": "False"},
      {"Value": "218", "Province": "area109", "IsValid": "False"},
      {"Value": "1102", "Province": "area999", "IsValid": "False"}
    ]
  },
  {
    "Value": "25",
    "Province": "N25",
    "Branches": [
      {"Value": "213", "Province": "davie", "IsValid": "False"},
      {"Value": "220", "Province": "area999", "IsValid": "False"},
      {"Value": "220", "Province": "areda999", "IsValid": "False"}
    ]
  }
]

现在我的要求是我需要将参数作为GetAllProvince(string searcKey) 传递给该方法，并且基于searcKey 只有相关数据应该被过滤并返回，

如示例 1， 何时应返回 searcKey = Default 以下结果（所有匹配情况应返回根级别或分支级别）

[
  {
    "Value": "21",
    "Province": "Default",
    "Branches": [
      {"Value": "1108", "Province": "davie", "IsValid": "False"},
      {"Value": "1107", "Province": "Ab area109", "IsValid": "False"},
      {"Value": "1105", "Province": "Hollywood", "IsValid":"False"},
      {"Value": "1105", "Province": "Ft. Lauderdale", "IsValid":"False"}
    ]
  }
]

示例 2， 何时应返回 searcKey = area109 以下结果（所有匹配情况应返回根级别或分支级别）

[
  {
    "Value": "21",
    "Province": "Default",
    "Branches": [
      {"Value": "1107", "Province": "Ab area109", "IsValid": "False"},
    ]
  },
  {
    "Value": "17",
    "Province": "East",
    "Branches": [
      {"Value": "212", "Province": "area109", "IsValid": "False"}
    ]
  },
  {
    "Value": "24",
    "Province": "East11",
    "Branches": [
      {"Value": "218", "Province": "area109", "IsValid": "False"}
    ]
  }
]

我该怎么做，请帮帮我，我在这 2 天里忙得不可开交。非常感谢。

Answer 1

我不会过滤 json 字符串。我会将 json 字符串反序列化为 ProvinceWithBranches 列表，然后循环读取 IEnumerable BranchItem 类，然后您可以对其进行 linq 查询。或者，如果您愿意，可以使用内部循环。我认为你几乎拥有你需要的东西。

或者你为什么不在 DataTable 上进行搜索。

Answer 2

反序列化为 ProvinceWithBranches 数组，然后

    private  IEnumerable<ProvinceWithBranches> Get(IEnumerable<ProvinceWithBranches> source,string filter)
          {
             var firstConditionResults= source.Where(p => p.Province == filter);
              var secondConditionResults = source.Where(p => p.Province  !=filter).Select(p=>new ProvinceWithBranches{
Value = p.Value,
Province = p.Province,
Branches = p.Branches.Where(branch=>branch.Province==filter) } );

              return firstConditionResults.Concat(secondConditionResults);
          }