c# list转datatable（datatable转换为json）

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 /// <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; }