DataTable与GridView从数据结构上来看都是一个由row和column组成表的结构，我们大部分时间是将DataTable绑定到GridView中，但web中当页面回传的时候，传递给GridView的数据源却再也找不到了，这是一件很郁闷的事情，下面我们根据两者的相似性，实现从GridView生成DataTable的方法，不管原来的GridView数据源是否是DataTable，都能使用该方法
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，可以得到GridView当前页面的数据，当然如果在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;
应用场景：将GridView导出Excel时，可能需要用到；
