ASP.NET列表信息以Excel形式导出

1.从数据查出数据扔进table中：

private DataTable getTable()
{
var dbHelper = applyBLL.CreateDataBase("VISAdoDb");
StringBuilder SB = new StringBuilder();
SB.AppendFormat("Select ApplyForID,Applicants,CardNo from VIS_ApplyFor where iState = 0 and (ApplyState ='B01')");
DbCommand cmd = dbHelper.GetSqlStringCommand(SB.ToString());
DataSet DTab = dbHelper.ExecuteDataSet(cmd);

if (DTab != null && DTab.Tables != null && DTab.Tables.Count > 0 && DTab.Tables[0].Rows.Count > 0)
{
DataTable dt = DTab.Tables[0];
return dt;
}
else
{
return new DataTable();
}
}
2.用xml文件定义要输出的表头元素：

string xml = string.Empty;

xml = "../../../App_Data/Configs_Pages/HDDXReportAuth.xml";
Dictionary<string, string> dict = Common.XMLHelper.GetDictionaryByXML(xml);

xml文件：

<?xml version="1.0" encoding="utf-8" ?>
<ExcelDict Remark="核对对象导出名单">
<Field Name="ApplyForID" Value="主键" Visible="False"></Field>
<Field Name="Applicants" Value="申请人姓名"></Field>
<Field Name="CardNo" Value="证件号码"></Field>
</ExcelDict>

3.最关键的一步，将model对象转换为excel

 bool i = ModelToExcel.ExExcel(dt, "核对对象导出名单", dict, false, "", ref result);

/// <summary>
/// 将一组对象导出成EXCEL
/// </summary>
/// <typeparam name="T">要导出对象的类型</typeparam>
/// <param name="objList">一组对象</param>
/// <param name="FileName">导出后的文件名</param>
/// <param name="columnInfo">列名信息</param>
/// <param name="IsExTotal">是否导出合计信息</param>
/// <param name="TotalMess">合计信息字符串</param>
public static bool ExExcel(DataTable objList, string FileName, Dictionary<string, string> columnInfo, bool IsExTotal, string TotalMess, ref string result)
{
FileName = FileName + "_" + DateTime.Now.ToString("yyyyMMddHH");
if (columnInfo.Count == 0)
{
//OutputResult(false, "请联系管理员，系统配置有问题！");
result = "请联系管理员，系统配置有问题！";
return false;
}
if (objList.Rows.Count == 0)
{
//OutputResult(false, "没有查询到数据");
result = "没有查询到数据";
return false;
}

string TmepUrl = "Temp/" + DateTime.Now.ToString("yyyyMMddhhmmss") + "/";
string path = System.Web.HttpContext.Current.Server.MapPath("~/" + TmepUrl);
if (!Directory.Exists(path)) //如果文件夹不存在则创建
{
Directory.CreateDirectory(path);
}
if (!File.Exists(path + FileName + ".xls"))
{
//使用File.Create创建再复制/移动/删除时会提示：文件正由另一进程使用,因此该进程无法访问该文件
//改用 FileStream或StreamWriter 获取 File.Create 返回的 System.IO.FileStream 再进行关闭就无此问题
using (FileStream sw = new FileStream(path + FileName + ".xls", FileMode.Create))
{
}
}

//生成EXCEL的HTML
System.Text.StringBuilder excelStr = new System.Text.StringBuilder();
excelStr.Append("<table cellspacing=\"0\" cellpadding=\"5\" rules=\"all\" border=\"1\">");
excelStr.Append("<tr style=\"height:50px; font-weight:bold;font-size:20pt\" align=\"center\">");
excelStr.Append("<td colspan='" + Convert.ToString(columnInfo.Count + 1) + "'>");
excelStr.Append(FileName);
excelStr.Append("</td>");
excelStr.Append("</tr>");
//是否导出合计信息
if (IsExTotal)
{
excelStr.Append("<tr style=\"height:30px;\" align=\"right\">");
excelStr.Append("<td colspan='" + Convert.ToString(columnInfo.Count + 1) + "'>");
excelStr.Append(TotalMess);
excelStr.Append("</td>");
excelStr.Append("</tr>");
}

//Type myType = objList.Columns.GetType();
//根据反射从传递进来的属性名信息得到要显示的属性
List<DataColumn> myPro = new List<DataColumn>();
excelStr.Append("<tr style=\"height:30px;\">");
excelStr.Append("<td>序号</td>");
foreach (string cName in columnInfo.Keys)
{
DataColumn p = objList.Columns[cName]; //myType.GetProperty(cName);
if (p != null)
{
myPro.Add(p);
excelStr.Append("<td>");
excelStr.Append(columnInfo[cName]);
excelStr.Append("</td>");
}
}
excelStr.Append("</tr>");
//如果没有找到可用的属性则结束
if (myPro.Count == 0) { result = "请联系管理员，系统配置有问题！"; return false; }
int index = 0;
foreach (DataRow obj in objList.Rows)
{
excelStr.Append("<tr style=\"height:30px;\">");
excelStr.Append("<td style=\"vnd.ms-excel.numberformat:@\" >" + (++index).ToString() + "</td>");
foreach (DataColumn p in myPro)
{
excelStr.Append("<td style=\"vnd.ms-excel.numberformat:@\" >");
object value = obj[p.ColumnName];
if (p.DataType.Name.ToLower() == "datetime")
{
value = (value == null || string.IsNullOrEmpty(value.ToString())) ? "" : ((DateTime)value).ToString("yyyy-MM-dd");
}
else if(p.DataType.Name.ToLower()=="decimal"){
value = (value == null || string.IsNullOrEmpty(value.ToString())) ? "" : string.Format("{0:F2}", value);
}
excelStr.Append(value);
excelStr.Append("</td>");
}

excelStr.Append("</tr>");
}
excelStr.Append("</table>");
//输出EXCEL
System.Text.StringBuilder ExportStr = new System.Text.StringBuilder();
ExportStr.Append("<html><head><META http-equiv=\"Content-Type\" content=\"text/html; charset=gb2312\"></head><body>");
ExportStr.Append(excelStr);
ExportStr.Append("</body></html>");

string Weburl = System.Web.HttpContext.Current.Request.ApplicationPath + TmepUrl + FileName + ".xls";

using (StreamWriter sw = new StreamWriter(path + FileName + ".xls", false, System.Text.Encoding.GetEncoding("utf-8")))
{
sw.Write(ExportStr);
sw.Close();
}
result = Weburl;
return true;
}
#endregion
}