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dataTable转成对象、json、list

news 2025/7/21 4:29:47

datatable转换成list集合

public static T TableToEntity<T>(DataTable dt, int rowindex = 0, bool isStoreDB = true){Type type = typeof(T);T entity = Activator.CreateInstance<T>();if (dt == null){return entity;}DataRow row = dt.Rows[rowindex];PropertyInfo[] pArray = type.GetProperties();foreach (PropertyInfo p in pArray){if (!dt.Columns.Contains(p.Name) || row[p.Name] == null || row[p.Name] == DBNull.Value){continue;}if (isStoreDB && p.PropertyType == typeof(DateTime) && Convert.ToDateTime(row[p.Name]) < Convert.ToDateTime("1753-01-02")){continue;}try{var obj = Convert.ChangeType(row[p.Name], p.PropertyType);p.SetValue(entity, obj, null);}catch (Exception){}}return entity;}

//多行datatable数据转换为对象：

 public static List<T> TableToList<T>(DataTable dt){List<T> listT = new List<T>();Type type = typeof(T);if (dt == null){return listT;}if (dt.Rows.Count > 0){for (int i = 0; i < dt.Rows.Count; i++){T entity = Activator.CreateInstance<T>();DataRow row = dt.Rows[i];PropertyInfo[] pArray = type.GetProperties();foreach (PropertyInfo p in pArray){if (!dt.Columns.Contains(p.Name) || row[p.Name] == null || row[p.Name] == DBNull.Value){continue;}if (p.PropertyType == typeof(DateTime) && Convert.ToDateTime(row[p.Name]) < Convert.ToDateTime("1753-01-02")){continue;}try{var obj = Convert.ChangeType(row[p.Name], p.PropertyType);p.SetValue(entity, obj, null);}catch (Exception){// throw;}}listT.Add(entity);}}return listT;}

datatable转换成json

public static string DataTableToJson(DataTable table){var JsonString = new StringBuilder();if (table==null){return "数据内容为null";}if (table.Rows.Count > 0 && table!=null){JsonString.Append("[");for (int i = 0; i < table.Rows.Count; i++){JsonString.Append("{");for (int j = 0; j < table.Columns.Count; j++){if (j < table.Columns.Count - 1){JsonString.Append("\"" + table.Columns[j].ColumnName.ToString() + "\":" + "\"" + table.Rows[i][j].ToString() + "\",");}else if (j == table.Columns.Count - 1){JsonString.Append("\"" + table.Columns[j].ColumnName.ToString() + "\":" + "\"" + table.Rows[i][j].ToString() + "\"");}}if (i == table.Rows.Count - 1){JsonString.Append("}");}else{JsonString.Append("},");}}JsonString.Append("]");}return JsonString.ToString();}