们一般是将DataTable绑定到GridView中,但有时候我们确实需要将数据从GridView转换成DataTable,我们可以根据两者的相似性,实现从GridView生成DataTable,下面为实现代码:
/**//*----------------------------------------------------------------
// Copyright (C) 2007 jillzhang 版权所有。
//
// 文件名:GridView.cs
// 文件功能描述:
//
// 创建标识:jillzhang
// 修改标识:
// 修改描述:
//
// 修改标识:
// 修改描述:
//----------------------------------------------------------------*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI.WebControls;
using System.Data;
using System.Web.UI;
namespace jzlib.Common
{
public class GridViewHelper
{
public 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>
/// 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;
}
}
}
使用这个函数,您可以得到GridView当前页面的数据,当然如果您在GridView中添加了复杂的控件,我们将略过这些内容,我们只从显示文本的列中导出数据到DataTable,如果您想导出GridView的全部数据,请在绑定前设置AllowPaging=false;
当然大家会问这样做有什么用呢?这个函数是我在开发将GridView导出
Excel的时候想到的,类似于这种应用情形,我想还有很多。
下面是一个示例,通过从上面的GridView导出DataTable,然后再绑定到下面的GridView中