C#实现DataTable,List和Json转换的方法

using System;using System.Data;using System.Text;using System.Collections.Generic;using System.Reflection;/// <summary>/// 将DataTable或Ilist<>转换成JSON格式/// </summary>public class ToJson{  public ToJson()  {  }//DataTable转成Json  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++)        {          Json.Append("/"" + dt.Columns[j].ColumnName.ToString() + "/":/"" + dt.Rows[i][j].ToString() + "/"");          if (j < dt.Columns.Count - 1)          {            Json.Append(",");          }        }        Json.Append("}");        if (i < dt.Rows.Count - 1)        {          Json.Append(",");        }      }    }    Json.Append("]}");    return Json.ToString();  }//List转成json  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();  }}

/// <summary>/// 对象转换为Json字符串/// </summary>/// <param name="jsonObject">对象</param>/// <returns>Json字符串</returns>public static string ToJson(object jsonObject){  string jsonString = "{";  PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();  for (int i = 0; i < propertyInfo.Length; i++)  {    object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);    string value = string.Empty;    if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)    {      value = "'" + objectValue.ToString() + "'";    }    else if(objectValue is string)    {      value = "'" + ToJson(objectValue.ToString()) + "'";    }    else if (objectValue is IEnumerable)    {      value = ToJson((IEnumerable)objectValue);    }    else    {      value = ToJson(objectValue.ToString());    }    jsonString += "/"" + ToJson(propertyInfo[i].Name) + "/":" + value + ",";  }  return Json.DeleteLast(jsonString) + "}";}/// <summary>/// 对象集合转换Json/// </summary>/// <param name="array">集合对象</param>/// <returns>Json字符串</returns>public static string ToJson(IEnumerable array){  string jsonString = "[";  foreach (object item in array)  {    jsonString += Json.ToJson(item) + ",";  }  return Json.DeleteLast(jsonString) + "]";}/// <summary>/// 普通集合转换Json/// </summary>/// <param name="array">集合对象</param>/// <returns>Json字符串</returns>public static string ToArrayString(IEnumerable array){  string jsonString = "[";  foreach (object item in array)  {    jsonString = ToJson(item.ToString()) + ",";  }  return Json.DeleteLast(jsonString) + "]";}/// <summary>/// 删除结尾字符/// </summary>/// <param name="str">需要删除的字符</param>/// <returns>完成后的字符串</returns>private static string DeleteLast(string str){  if (str.Length > 1)  {    return str.Substring(0, str.Length - 1);  }  return str;}/// <summary>/// Datatable转换为Json/// </summary>/// <param name="table">Datatable对象</param>/// <returns>Json字符串</returns>public static string ToJson(DataTable table){  string jsonString = "[";  DataRowCollection drc = table.Rows;  for (int i = 0; i < drc.Count; i++)  {    jsonString += "{";    foreach (DataColumn column in table.Columns)    {      jsonString += "/"" + ToJson(column.ColumnName) + "/":";      if (column.DataType == typeof(DateTime) || column.DataType == typeof(string))      {        jsonString += "/"" + ToJson(drc[i][column.ColumnName].ToString()) + "/",";      }      else      {        jsonString += ToJson(drc[i][column.ColumnName].ToString()) + ",";      }    }    jsonString = DeleteLast(jsonString) + "},";  }  return DeleteLast(jsonString) + "]";}/// <summary>/// DataReader转换为Json/// </summary>/// <param name="dataReader">DataReader对象</param>/// <returns>Json字符串</returns>public static string ToJson(DbDataReader dataReader){  string jsonString = "[";  while (dataReader.Read())  {    jsonString += "{";    for (int i = 0; i < dataReader.FieldCount; i++)    {      jsonString += "/"" + ToJson(dataReader.GetName(i)) + "/":";      if (dataReader.GetFieldType(i) == typeof(DateTime) || dataReader.GetFieldType(i) == typeof(string))      {        jsonString += "/"" + ToJson(dataReader[i].ToString()) + "/",";      }      else      {        jsonString += ToJson(dataReader[i].ToString()) + ",";      }    }    jsonString = DeleteLast(jsonString) + "}";  }  dataReader.Close();  return DeleteLast(jsonString) + "]";}/// <summary>/// DataSet转换为Json/// </summary>/// <param name="dataSet">DataSet对象</param>/// <returns>Json字符串</returns>public static string ToJson(DataSet dataSet){  string jsonString = "{";  foreach (DataTable table in dataSet.Tables)  {    jsonString += "/"" + ToJson(table.TableName) + "/":" + ToJson(table) + ",";  }  return jsonString = DeleteLast(jsonString) + "}";}/// <summary>/// String转换为Json/// </summary>/// <param name="value">String对象</param>/// <returns>Json字符串</returns>public static string ToJson(string value){  if (string.IsNullOrEmpty(value))  {    return string.Empty;  }  string temstr;  temstr = value;  temstr = temstr.Replace("{", "｛").Replace("}", "｝").Replace(":", "：").Replace(",", "，").Replace("[", "【").Replace("]", "】").Replace(";", "；").Replace("/n", "<br/>").Replace("/r", "");  temstr = temstr.Replace("/t", "  ");  temstr = temstr.Replace("'", "/'");  temstr = temstr.Replace(@"/", @"//");  temstr = temstr.Replace("/"", "/"/"");  return temstr;}