/******************************************************************************* * Copyright © 2016 HT.Cloud.Framework 版权所有 * Author: HT.Cloud * Description: WaterCloud快速开发平台 * Website: *********************************************************************************/ using System; using System.Data; using System.Text; namespace HT.Cloud.Code { public static partial class Extensions { /// /// 获取表里某页的数据 /// /// 表数据 /// 当前页 /// 分页大小 /// 返回总页数 /// 返回当页表数据 public static DataTable GetPage(this DataTable data, int pageIndex, int pageSize, out int allPage) { allPage = data.Rows.Count / pageSize; allPage += data.Rows.Count % pageSize == 0 ? 0 : 1; DataTable Ntable = data.Clone(); int startIndex = pageIndex * pageSize; int endIndex = startIndex + pageSize > data.Rows.Count ? data.Rows.Count : startIndex + pageSize; if (startIndex < endIndex) for (int i = startIndex; i < endIndex; i++) { Ntable.ImportRow(data.Rows[i]); } return Ntable; } /// /// 根据字段过滤表的内容 /// /// 表数据 /// 条件 /// /// public static DataTable GetDataFilter(DataTable data, string condition) { if (data != null && data.Rows.Count > 0) { if (condition.Trim() == "") { return data; } else { DataTable newdt = new DataTable(); newdt = data.Clone(); DataRow[] dr = data.Select(condition); for (int i = 0; i < dr.Length; i++) { newdt.ImportRow((DataRow)dr[i]); } return newdt; } } else { return null; } } /// /// 转换为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 = String.Format(strValue, type); if (j < dt.Columns.Count - 1) { jsonString.Append(strValue + ","); } else { jsonString.Append(strValue); } } jsonString.Append("},"); } if (jsonString.Length > 1) { jsonString.Remove(jsonString.Length - 1, 1); } jsonString.Append("]"); return jsonString.ToString(); } } }