将 DataTable 或 String 数据转化为json(.NET)

直接贴代码：

using System;
using System.Data;
using System.Text;
using System.Collections.Generic;
using System.Reflection;

namespace PowerCheck.Tools
{

    public class ToJson
    {
        public ToJson()
        {

        }
        public static string DataTableToJson(string jsonName, DataTable dt)
        {
            StringBuilder Json = new StringBuilder();
            Json.Append("{\"" + jsonName + "\":[");
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    Json.Append("{");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        StringBuilder sb = new StringBuilder();
                        escape(dt.Rows[i][j].ToString(),sb);

                        Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + sb.ToString() + "\"");
                        if (j < dt.Columns.Count - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");
                    if (i < dt.Rows.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]}");
            return Json.ToString();
        }

        /// <summary>
        /// 将string数组转换成json字符串
        /// </summary>
        /// <param name="TagStrings">json对象数组名称</param>
        /// <param name="Strings">json对象数组值</param>
        /// <returns></returns>
        public static string StringArrayToJason(string[] TagStrings, string[] Strings)
        {
            StringBuilder Json = new StringBuilder();
            Json.Append("{");
            for (int i = 0; i < Strings.Length; i++)
            {
                Json.Append(TagStrings[i]);
                Json.Append(":");
                Json.Append(Strings[i]);
                if (i < Strings.Length - 1)
                {
                    Json.Append(",");
                }
            }
            Json.Append("}");
            return Json.ToString();
        }

        public static string ObjectToJson<T>(string jsonName, IList<T> IL)
        {
            StringBuilder Json = new StringBuilder();
            Json.Append("{\"" + jsonName + "\":[");
            if (IL.Count > 0)
            {
                for (int i = 0; i < IL.Count; i++)
                {
                    T obj = Activator.CreateInstance<T>();
                    Type type = obj.GetType();
                    PropertyInfo[] pis = type.GetProperties();
                    Json.Append("{");
                    for (int j = 0; j < pis.Length; j++)
                    {
                        Json.Append("\"" + pis[j].Name.ToString() + "\":\"" + pis[j].GetValue(IL[i], null) + "\"");
                        if (j < pis.Length - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");
                    if (i < IL.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]}");
            return Json.ToString();
        }


        public static void escape(string s, StringBuilder sb)
        {

            for (int i = 0; i < s.Length; i++)
            {
                char ch = s[i];

                switch (ch)
                {

                    case '"':
                        sb.Append("\\\"");
                        break;

                    case '\\':

                        sb.Append("\\\\");

                        break;

                    case '\b':

                        sb.Append("\\b");

                        break;

                    case '\f':

                        sb.Append("\\f");

                        break;

                    case '\n':

                        sb.Append("\\n");

                        break;

                    case '\r':

                        sb.Append("\\r");

                        break;

                    case '\t':

                        sb.Append("\\t");

                        break;

                    case '/':

                        sb.Append("\\/");

                        break;

                    default:

                        // Reference: http://www.unicode.org/versions/Unicode5.1.0/

                        if ((ch >= '\u0000' && ch <= '\u001F')

                        || (ch >= '\u007F' && ch <= '\u009F')

                        || (ch >= '\u2000' && ch <= '\u20FF'))
                        {

                            string ss = Convert.ToString(ch,16);

                            sb.Append("\\u");

                            for (int k = 0; k < 4 - ss.Length; k++)
                            {

                                sb.Append('0');

                            }

                            sb.Append(ss.ToUpper());

                        }
                        else
                        {

                            sb.Append(ch);

                        }

                        break;

                }

            }

        }

    }



}