using Newtonsoft.Json; using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Reflection; using System.Text; namespace Common.Extensions { public static class ConvertJsonExtension { #region 私有方法 /// /// 过滤特殊字符 /// /// 字符串 /// json字符串 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(); } /// /// 格式化字符型、日期型、布尔型 /// /// /// /// 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 /// /// list转换为Json /// /// /// /// public static string ListToJson(this IList list) { object obj = list[0]; return ListToJson(list, obj.GetType().Name); } /// /// list转换为json /// /// /// /// /// private static string ListToJson(this IList list, string JsonName) { if (list.Count == 0) { return ""; } StringBuilder Json = new StringBuilder(); if (string.IsNullOrEmpty(JsonName)) JsonName = list[0].GetType().Name; Json.Append("{\"" + JsonName + "\":["); for (int i = 0; i < list.Count; i++) { T obj = Activator.CreateInstance(); 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 /// /// 对象转换为json /// /// json对象 /// json字符串 public static string ToJson(this 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 对象集合转换为json /// /// 对象集合转换为json /// /// 对象集合 /// json字符串 public static string ToJson(this 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 /// /// 普通集合转换Json /// /// 集合对象 /// Json字符串 public static string ToArrayString(this 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 /// /// DataSet转换为Json /// /// DataSet对象 /// Json字符串 public static string ToJson(this 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 /// /// Datatable转换为Json /// /// Datatable对象 /// Json字符串 public static string ToJson(this 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(); } /// /// DataTable转换为Json /// public static string ToJson(this 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 /// /// DataReader转换为Json /// /// DataReader对象 /// Json字符串 public static string ReaderJson(this IDataReader dataReader) { StringBuilder jsonString = new StringBuilder(); Dictionary ModelField = new Dictionary(); for (int i = 0; i < dataReader.FieldCount; i++) { ModelField.Add(dataReader.GetName(i), dataReader.GetFieldType(i)); } jsonString.Append("["); while (dataReader.Read()) { jsonString.Append("{"); foreach (KeyValuePair keyVal in ModelField) { Type type = keyVal.Value; string strKey = keyVal.Key; string strValue = dataReader[strKey].ToString(); jsonString.Append("\"" + strKey + "\":"); strValue = StringFormat(strValue, type); jsonString.Append(strValue + ","); } jsonString.Remove(jsonString.Length - 1, 1); jsonString.Append("},"); } dataReader.Close(); jsonString.Remove(jsonString.Length - 1, 1); jsonString.Append("]"); return jsonString.ToString(); } #endregion public static T DeserializeObject(this string entityString) { if (string.IsNullOrEmpty(entityString)) { return default(T); } if (entityString == "{}") { entityString = "[]"; } return JsonConvert.DeserializeObject(entityString); } public static string Serialize(this object obj, JsonSerializerSettings formatDate = null) { if (obj == null) return null; formatDate = formatDate ?? new JsonSerializerSettings { DateFormatString = "yyyy-MM-dd HH:mm:ss" }; return JsonConvert.SerializeObject(obj, formatDate); } } }