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var listModel = GetModelList();var jaProbType = new JArray();foreach (var p in listModel ){    if (p.IndexType == "ProbType")    {        var jo = new JObject        {            { "TypeCode", p.IndexCode },            { "TypeName", p.IndexDescribe }        };        jaProbType.Add(jo);     }}return new JObject {
  {"ProbType", jaProbType}};

精减后：

var listModel = GetModelList();return new JObject{{"ProbType",  JArray.FromObject(listModel.Where(p => p.IndexType == "ProbType").Select(p => new JObject { { "TypeCode", p.IndexCode }, { "TypeName", p.IndexDescribe } }).ToArray())}};

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