本文实例讲述了C#实现DataTable,List和Json转换的方法。分享给大家供大家参考，具体如下：

1. 将DataTable或Ilist<>转换成JSON格式

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(); }}

2. 各种数据集转换为json

/// <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;}

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