using System; using System.Collections.Generic; using System.Text; using System.Data; using System.Reflection; using System.Collections; using System.Data.Common; public class ConvertJson { #region 私有方法 /// <summary> /// 过滤特殊字符 /// </summary> private static string String2Json(String s) { StringBuilder sb = new StringBuilder(); for ( int i = 0 ; i < s.Length; i++) { char c = s.ToCharArray()[i]; switch (c) { case '\"' : sb.Append( "\\\"" ); break ; 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 ; default : sb.Append(c); break ; } } return sb.ToString(); } /// <summary> /// 格式化字符型、日期型、布尔型 /// </summary> private static string StringFormat(string str, Type type) { if (type == typeof(string)) { str = String2Json(str); str = "\"" + str + "\"" ; } else if (type == typeof(DateTime)) { str = "\"" + str + "\"" ; } else if (type == typeof(bool)) { str = str.ToLower(); } else if (type != typeof(string) && string.IsNullOrEmpty(str)) { str = "\"" + str + "\"" ; } return str; } #endregion #region List转换成Json /// <summary> /// List转换成Json /// </summary> public static string ListToJson<T>(IList<T> list) { object obj = list[ 0 ]; return ListToJson<T>(list, obj.GetType().Name); } /// <summary> /// List转换成Json /// </summary> public static string ListToJson<T>(IList<T> list, string jsonName) { StringBuilder Json = new StringBuilder(); if (string.IsNullOrEmpty(jsonName)) jsonName = list[ 0 ].GetType().Name; Json.Append( "{\"" + jsonName + "\":[" ); if (list.Count > 0 ) { for ( int i = 0 ; i < list.Count; i++) { T obj = Activator.CreateInstance<T>(); PropertyInfo[] pi = obj.GetType().GetProperties(); Json.Append( "{" ); for ( int j = 0 ; j < pi.Length; j++) { Type type = pi[j].GetValue(list[i], null ).GetType(); Json.Append( "\"" + pi[j].Name.ToString() + "\":" + StringFormat(pi[j].GetValue(list[i], null ).ToString(), type)); if (j < pi.Length - 1 ) { Json.Append( "," ); } } Json.Append( "}" ); if (i < list.Count - 1 ) { Json.Append( "," ); } } } Json.Append( "]}" ); return Json.ToString(); } #endregion #region 对象转换为Json /// <summary> /// 对象转换为Json /// </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 + "," ; } jsonString.Remove(jsonString.Length - 1 , jsonString.Length); return jsonString + "}" ; } #endregion #region 对象集合转换Json /// <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 += ToJson(item) + "," ; } jsonString.Remove(jsonString.Length - 1 , jsonString.Length); return jsonString + "]" ; } #endregion #region 普通集合转换Json /// <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()) + "," ; } jsonString.Remove(jsonString.Length - 1 , jsonString.Length); return jsonString + "]" ; } #endregion #region DataSet转换为Json /// <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 += "\"" + table.TableName + "\":" + ToJson(table) + "," ; } jsonString = jsonString.TrimEnd( ',' ); return jsonString + "}" ; } #endregion #region Datatable转换为Json /// <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 dt) { StringBuilder jsonString = new StringBuilder(); jsonString.Append( "[" ); DataRowCollection drc = dt.Rows; for ( int i = 0 ; i < drc.Count; i++) { jsonString.Append( "{" ); for ( int j = 0 ; j < dt.Columns.Count; j++) { string strKey = dt.Columns[j].ColumnName; string strValue = drc[i][j].ToString(); Type type = dt.Columns[j].DataType; jsonString.Append( "\"" + strKey + "\":" ); strValue = StringFormat(strValue, type); if (j < dt.Columns.Count - 1 ) { jsonString.Append(strValue + "," ); } else { jsonString.Append(strValue); } } jsonString.Append( "}," ); } jsonString.Remove(jsonString.Length - 1 , 1 ); jsonString.Append( "]" ); return jsonString.ToString(); } /// <summary> /// DataTable转换为Json /// </summary> public static string ToJson(DataTable dt, string jsonName) { StringBuilder Json = new StringBuilder(); if (string.IsNullOrEmpty(jsonName)) jsonName = dt.TableName; 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++) { Type type = dt.Rows[i][j].GetType(); Json.Append( "\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j].ToString(), type)); if (j < dt.Columns.Count - 1 ) { Json.Append( "," ); } } Json.Append( "}" ); if (i < dt.Rows.Count - 1 ) { Json.Append( "," ); } } } Json.Append( "]}" ); return Json.ToString(); } #endregion #region DataReader转换为Json /// <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) { StringBuilder jsonString = new StringBuilder(); jsonString.Append( "[" ); while (dataReader.Read()) { jsonString.Append( "{" ); for ( int i = 0 ; i < dataReader.FieldCount; i++) { Type type = dataReader.GetFieldType(i); string strKey = dataReader.GetName(i); string strValue = dataReader[i].ToString(); jsonString.Append( "\"" + strKey + "\":" ); strValue = StringFormat(strValue, type); if (i < dataReader.FieldCount - 1 ) { jsonString.Append(strValue + "," ); } else { jsonString.Append(strValue); } } jsonString.Append( "}," ); } dataReader.Close(); jsonString.Remove(jsonString.Length - 1 , 1 ); jsonString.Append( "]" ); return jsonString.ToString(); } #endregion }