自定义的GridView操作类代码,Asp.Net代码库,德仔网

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【Asp.Net】自定义的GridView操作类
作者:feige / 发布于2014/8/10/ 1114
这个自定义的C#类可以大大简化GridView的操作，这个C#类定义了一些GridView常用的方法，包括：获取单元格内容、设置单元格内容、从GridView的数据生成DataTable、将集合类转换成DataTable、将泛型集合类转换成DataTable，简单实用。

	using System;
	using System.Collections.Generic;
	using System.Web.UI;
	using System.Web.UI.WebControls;
	using System.Data;
	using System.Collections;
	using System.Reflection;
	
	namespace DotNet.Utilities
	{
	 public class GridViewHelper
	 {
	 #region 私有方法
	 /// <summary>
	 /// 截取内容长度
	 /// </summary>
	 /// <param name="o_Str">原字符串</param>
	 /// <param name="len">截取长度</param>
	 /// <returns>截取后字符串</returns>
	 private static string GetStrPartly(string o_Str, int len)
	 {
	 if (len == 0)
	 {
	 return o_Str;
	 }
	 else
	 {
	 if (o_Str.Length > len)
	 {
	 return o_Str.Substring(0, len) + "..";
	 }
	 else
	 {
	 return o_Str;
	 }
	 }
	 }
	
	 /// <summary>
	 /// 获取单元格内容
	 /// </summary>
	 /// <param name="cell">TableCell</param>
	 /// <returns>内容</returns>
	 private static string GetCellText(TableCell cell)
	 {
	 string text = cell.Text;
	 if (!string.IsNullOrEmpty(text))
	 {
	 return text;
	 }
	 foreach (Control control in cell.Controls)
	 {
	 if (control != null && control is IButtonControl)
	 {
	 IButtonControl btn = control as IButtonControl;
	 text = btn.Text.Replace("\r\n", "").Trim();
	 break;
	 }
	 if (control != null && control is ITextControl)
	 {
	 LiteralControl lc = control as LiteralControl;
	 if (lc != null)
	 {
	 continue;
	 }
	 ITextControl l = control as ITextControl;
	 text = l.Text.Replace("\r\n", "").Trim();
	 break;
	 }
	 }
	 return text;
	 }
	
	 /// <summary>
	 /// 设置单元格内容
	 /// </summary>
	 /// <param name="cell">TableCell</param>
	 /// <param name="maxLen">最大长度</param>
	 private static void SetCellText(TableCell cell, int maxLen)
	 {
	 string text = cell.Text;
	 if (!string.IsNullOrEmpty(text))
	 {
	 cell.Text = GetStrPartly(text, maxLen);
	 }
	 foreach (Control control in cell.Controls)
	 {
	 if (control != null && control is IButtonControl)
	 {
	 IButtonControl btn = control as IButtonControl;
	 text = btn.Text.Replace("\r\n", "").Trim();
	 btn.Text = GetStrPartly(text, maxLen);
	 break;
	 }
	 if (control != null && control is ITextControl)
	 {
	 LiteralControl lc = control as LiteralControl;
	 if (lc != null)
	 {
	 continue;
	 }
	 ITextControl l = control as ITextControl;
	 text = l.Text.Replace("\r\n", "").Trim();
	 if (l is DataBoundLiteralControl)
	 {
	 cell.Text = GetStrPartly(text, maxLen);
	 break;
	 }
	 else
	 {
	 l.Text = GetStrPartly(text, maxLen);
	 break;
	 }
	 }
	 }
	 }
	 #endregion
	
	 #region 公有方法
	 /// <summary>
	 /// 从GridView的数据生成DataTable
	 /// </summary>
	 /// <param name="gv">GridView对象</param>
	 public static DataTable GridView2DataTable(GridView gv)
	 {
	 DataTable table = new DataTable();
	 int rowIndex = 0;
	 List<string> cols = new List<string>();
	 if (!gv.ShowHeader && gv.Columns.Count == 0)
	 {
	 return table;
	 }
	 GridViewRow headerRow = gv.HeaderRow;
	 int columnCount = headerRow.Cells.Count;
	 for (int i = 0; i < columnCount; i++)
	 {
	 string text = GetCellText(headerRow.Cells[i]);
	 cols.Add(text);
	 }
	 foreach (GridViewRow r in gv.Rows)
	 {
	 if (r.RowType == DataControlRowType.DataRow)
	 {
	 DataRow row = table.NewRow();
	 int j = 0;
	 for (int i = 0; i < columnCount; i++)
	 {
	 string text = GetCellText(r.Cells[i]);
	 if (!String.IsNullOrEmpty(text))
	 {
	 if (rowIndex == 0)
	 {
	 string columnName = cols[i];
	 if (String.IsNullOrEmpty(columnName))
	 {
	 continue;
	 }
	 if (table.Columns.Contains(columnName))
	 {
	 continue;
	 }
	 DataColumn dc = table.Columns.Add();
	 dc.ColumnName = columnName;
	 dc.DataType = typeof(string);
	 }
	 row[j] = text;
	 j++;
	 }
	 }
	 rowIndex++;
	 table.Rows.Add(row);
	 }
	 }
	 return table;
	 }
	
	 /// <summary>
	 /// 将集合类转换成DataTable
	 /// </summary>
	 /// <param name="list">集合</param>
	 public static DataTable ToDataTable(IList list)
	 {
	 DataTable result = new DataTable();
	 if (list.Count > 0)
	 {
	 PropertyInfo[] propertys = list[0].GetType().GetProperties();
	 foreach (PropertyInfo pi in propertys)
	 {
	 result.Columns.Add(pi.Name, pi.PropertyType);
	 }
	
	 for (int i = 0; i < list.Count; i++)
	 {
	 ArrayList tempList = new ArrayList();
	 foreach (PropertyInfo pi in propertys)
	 {
	 object obj = pi.GetValue(list[i], null);
	 tempList.Add(obj);
	 }
	 object[] array = tempList.ToArray();
	 result.LoadDataRow(array, true);
	 }
	 }
	 return result;
	 }
	
	 /// <summary>
	 /// 将泛型集合类转换成DataTable
	 /// </summary>
	 /// <typeparam name="T">集合项类型</typeparam>
	 /// <param name="list">集合</param>
	 /// <param name="propertyName">需要返回的列的列名</param>
	 /// <returns>数据集(表)</returns>
	 public static DataTable ToDataTable<T>(IList<T> list, params string[] propertyName)
	 {
	 List<string> propertyNameList = new List<string>();
	 if (propertyName != null) propertyNameList.AddRange(propertyName);
	
	 DataTable result = new DataTable();
	 if (list.Count > 0)
	 {
	 PropertyInfo[] propertys = list[0].GetType().GetProperties();
	 foreach (PropertyInfo pi in propertys)
	 {
	 if (propertyNameList.Count == 0)
	 {
	 result.Columns.Add(pi.Name, pi.PropertyType);
	 }
	 else
	 {
	 if (propertyNameList.Contains(pi.Name)) result.Columns.Add(pi.Name, pi.PropertyType);
	 }
	 }
	
	 for (int i = 0; i < list.Count; i++)
	 {
	 ArrayList tempList = new ArrayList();
	 foreach (PropertyInfo pi in propertys)
	 {
	 if (propertyNameList.Count == 0)
	 {
	 object obj = pi.GetValue(list[i], null);
	 tempList.Add(obj);
	 }
	 else
	 {
	 if (propertyNameList.Contains(pi.Name))
	 {
	 object obj = pi.GetValue(list[i], null);
	 tempList.Add(obj);
	 }
	 }
	 }
	 object[] array = tempList.ToArray();
	 result.LoadDataRow(array, true);
	 }
	 }
	 return result;
	 }
	 #endregion
	 }
	}
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