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asp.net中通过html格式导出excel文件

2012-09-07 14:02 736 查看

//通过html格式生成导出excel文件，下载保存。
StreamExport(wgMdcStaff5, fileName, ToDataTable<MdcDrugProcureStockViewDto>(response.responseObjects));
调用方法//
//把实体集合对象转化成datatable类型的数据
public static System.Data.DataTable ToDataTable<T>(List<T> entitys)
{
//检查实体集合不能为空
if (entitys == null || entitys.Count < 1)
{
throw new Exception("需转换的集合为空");
}
//取出第一个实体的所有Propertie
Type entityType = entitys[0].GetType();
PropertyInfo[] entityProperties = entityType.GetProperties();
//生成DataTable的structure
//生产代码中，应将生成的DataTable结构Cache起来，此处略
System.Data.DataTable dt = new System.Data.DataTable();
for (int i = 0; i < entityProperties.Length; i++)
{
Type colType = entityProperties[i].PropertyType;
if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition() == typeof(Nullable<>)))
{
colType = colType.GetGenericArguments()[0];
}
dt.Columns.Add(entityProperties[i].Name, colType);
}
//将所有entity添加到DataTable中
foreach (object entity in entitys)
{
//检查所有的的实体都为同一类型
if (entity.GetType() != entityType)
{
throw new Exception("要转换的集合元素类型不一致");
}
object[] entityValues = new object[entityProperties.Length];
for (int i = 0; i < entityProperties.Length; i++)
{
entityValues[i] = entityProperties[i].GetValue(entity, null) == null ? DBNull.Value : entityProperties[i].GetValue(entity, null);
}
dt.Rows.Add(entityValues);
}
return dt;
}

/// <summary>
/// 通过流导出Excel
/// </summary>
/// <param name="ds">数据源DataSet</param>
/// <param name="fileName">保存文件名(例如：a.xls)</param>
/// <returns></returns>
public bool StreamExport(WsdGrid wsdGrid, string fileName, System.Data.DataTable dt)
{
if (fileName == string.Empty)
{
return false;
}
StringBuilder content = new StringBuilder();
int i = 0;
int cl = wsdGrid.Columns.Count;
content.Append("<html xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:x='urn:schemas-microsoft-com:office:excel' xmlns='http://www.w3.org/TR/REC-html40'>");
content.Append("<head><title></title><meta http-equiv='Content-Type' content=\"text/html; charset=gb2312\">");
//注意：[if gte mso 9]到[endif]之间的代码，用于显示Excel的网格线，若不想显示Excel的网格线，可以去掉此代码
content.Append("");
content.Append("</head><body><table> ");
//标题
//content.Append("<tr align='center'><td colspan='" + wsdGrid.Columns.Count + "'><strong>" + fileName + "</strong></td></tr>");
//content.Append("<tr align='center'></tr>");
content.Append("<tr align='center'> <td colspan='" + wsdGrid.Columns.Count + "'>");
content.Append("<table border='1' >");
content.Append("<tr align='center' >");
for (i = 0; i < cl; i++)
{
content.Append("<td>" + wsdGrid.Columns[i].HeaderText.ToString() + "</td>");
}
content.Append("</tr>");
//逐行处理数据
foreach (DataRow row in dt.Rows)
{
for (i = 0; i < cl; i++)
{
//头加tr
if (i == 0)
content.Append("<tr align='center' >");
object obj = row[wsdGrid.Columns[i].UniqueName];
Type type = obj.GetType();

if (type.Name == "Int32" || type.Name == "Single" || type.Name == "Double" || type.Name == "Decimal" || type.Name == "DateTime")
{
if (type.Name == "DateTime")
content.AppendFormat("<td style='vnd.ms-excel.numberformat:yyyy-mm-dd'>{0}</td>", obj);
else if (type.Name == "Int32")
content.AppendFormat("<td style='vnd.ms-excel.numberformat:#,##0'>{0}</td>", obj);
else
{
//设置如果为数字型的保留两位小数
if (wsdGrid.Columns[i].UniqueName == "storageQty"|| wsdGrid.Columns[i].UniqueName =="storageSumQty")
{
content.AppendFormat("<td style='vnd.ms-excel.numberformat:#,##0'>{0}</td>", obj);
}
else
content.AppendFormat("<td style='vnd.ms-excel.numberformat:#,##0.00'>{0}</td>", obj);
}
}
else
content.AppendFormat("<td style='vnd.ms-excel.numberformat:@'>{0}</td>", obj);
//尾加/tr
if (i == cl - 1)
content.Append("</tr>");
}
}
content.Append("</table></td></tr>");
content.Append("</table></body></html>");

content.Replace(" ", "");
System.Web.HttpContext.Current.Response.Clear();
System.Web.HttpContext.Current.Response.Buffer = true;
System.Web.HttpContext.Current.Response.ContentType = "application/ms-excel";
//System.Web.HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
System.Web.HttpContext.Current.Response.Charset = "GB2312";
System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
fileName = System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8);
System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName + ".xls");
System.Web.HttpContext.Current.Response.Write(content.ToString());
System.Web.HttpContext.Current.Response.End();
return true;
}
本文出自 “zhangjingjing” 博客，请务必保留此出处http://zhjjzhjj.blog.51cto.com/1802676/984429

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