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