GridView导出到Excel(可选择记录条数)

最近有点空就喜欢去研究研究GridView的使用,所以你如果是想要学习这方面的东西可以来参观参观。^_^
这里说明一下GridView到Excel的导出实现。平时你看到的GridView导出Excel代码可能很多了，但是我这里的肯定和你平时看到的不同，先看一下我的截图吧:



看出来了吧，我的导出是有条件可以选择的。你是想到处当前页面的数据呢还是想到处全部数据，或者是前30条数据。。。。
先说明一下我的实现原理吧。



当点击导出按钮时会去判断RadioButtonlist当前值然后去选择应该导出哪些数据到Excel。代码如下:



导出GrivView到Excel的方法:

public static void Export(string fileName, GridView gv,int top)

{

HttpContext.Current.Response.Clear();

HttpContext.Current.Response.AddHeader(

"content-disposition", string.Format("attachment; filename={0}", fileName));

HttpContext.Current.Response.ContentType = "application/ms-excel";

using (StringWriter sw = new StringWriter())

{

using (HtmlTextWriter htw = new HtmlTextWriter(sw))

{

// Create a form to contain the grid

Table table = new Table();

// add the header row to the table

if (gv.HeaderRow != null)

{

GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);

table.Rows.Add(gv.HeaderRow);

}

// add each of the data rows to the table

if (top == 30)

{

for (int i = 0; i <= 29; i++)

{

GridViewRow row = gv.Rows[i];

GridViewExportUtil.PrepareControlForExport(row);

table.Rows.Add(row);

}

}

else

{

foreach (GridViewRow row in gv.Rows)

{

GridViewExportUtil.PrepareControlForExport(row);

table.Rows.Add(row);

}

}

// add the footer row to the table

if (gv.FooterRow != null)

{

GridViewExportUtil.PrepareControlForExport(gv.FooterRow);

table.Rows.Add(gv.FooterRow);

}

// render the table into the htmlwriter

table.RenderControl(htw);

// render the htmlwriter into the response

HttpContext.Current.Response.Write(sw.ToString());

HttpContext.Current.Response.End();

}

}

}

/// <summary>

/// Replace any of the contained controls with literals

/// </summary>

/// <param name="control"></param>

private static void PrepareControlForExport(Control control)

{

for (int i = 0; i < control.Controls.Count; i++)

{

Control current = control.Controls[i];

if (current is LinkButton)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));

}

else if (current is ImageButton)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));

}

else if (current is HyperLink)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));

}

else if (current is DropDownList)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));

}

else if (current is CheckBox)

{

control.Controls.Remove(current);

control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));

}

if (current.HasControls())

{

GridViewExportUtil.PrepareControlForExport(current);

}

}

本文转载处:http://blog.csdn.net/dujingjing1230/archive/2009/10/29/4744428.aspx