递归循环JSON

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;



/// <summary>

/// JsonHelper 的摘要说明

/// </summary>

public class JsonHelper

{

    /// <summary>

    /// 转换JSON对象

    /// </summary>

    /// <param name="company"></param>

    /// <returns></returns>

    public static string ConvertToJson(Company company)

    {

        string json = "CompanyName:\"" + company.CompanyName + "\",ContactName:\"" + company.ContactName + "\",City:\"" + company.City + "\",CustomerID:\"" + company.CustomerID + "\",children:{0}";

        return json;

    }



    /// <summary>

    /// 转换JSON对象集合，包含子集，递归加载

    /// </summary>

    /// <param name="companyList"></param>

    /// <returns></returns>

    public static string ConvertToJson(List<Company> companyList)

    {

        string json = "[";

        //获取第一级目录

        List<Company> rootList = companyList.Where(x => string.IsNullOrEmpty(x.Pid)).ToList<Company>();

        foreach (Company root in rootList)

        {

            string js = ConvertToJson(root);

            string children="";

            children = DiGui(companyList, children, root.CustomerID);

            json += "{"+string.Format(js, children) + "},";

        }

        if (json.LastIndexOf(",") < 1)

        {

            json += "]";

        }

        else

        {

            json = json.Substring(0, json.Length - 1) + "]";

        }

        return json.Replace(",children:[]", "");

    }



    /// <summary>

    /// 递归调用添加包含子集的JSON数组

    /// </summary>

    private static string DiGui(List<Company> companyList,string children,string pid)

    {

        children = "[";

        List<Company> childerList = companyList.Where(x => x.Pid.ToUpper() == pid.ToUpper()).ToList<Company>();

        foreach (Company item in childerList)

        {

            string js = ConvertToJson(item);

            string cd = "";

            cd = DiGui(companyList, cd, item.CustomerID);

            children += "{"+string.Format(js, cd) + "},";

        }

        if (children.LastIndexOf(",") < 1)

        {

            children += "]";

        }

        else

        {

            children = children.Substring(0, children.Length - 1) + "]";

        }

        return children;

    }



    



}