C# 将数据集导出到EXCEL
我使用以下代码将字段从数据库表导出到excel中。我想做的是能够编写一条SQL语句,从多个表中检索字段并将它们导出到excel中。此代码只允许我导出一个表。另外,如何显示保存提示对话框?样本代码将不胜感激-非常感谢C# 将数据集导出到EXCEL,c#,asp.net,export-to-excel,C#,Asp.net,Export To Excel,我使用以下代码将字段从数据库表导出到excel中。我想做的是能够编写一条SQL语句,从多个表中检索字段并将它们导出到excel中。此代码只允许我导出一个表。另外,如何显示保存提示对话框?样本代码将不胜感激-非常感谢 protected void export_Click(object sender, EventArgs e) { string sql = null; string data = null; string path = save_a
protected void export_Click(object sender, EventArgs e)
{
string sql = null;
string data = null;
string path = save_as.Text;
int i = 0;
int j = 0;
Excel.Application xlApp;
Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet;
object misValue = System.Reflection.Missing.Value;
xlApp = new Excel.ApplicationClass();
xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
//connectionString = "data source=servername;initial catalog=databasename;user id=username;password=password;";
SqlConnection cnn = new SqlConnection(GetConnectionString());
cnn.Open();
sql = "SELECT Story, CreationDate FROM Story";
SqlDataAdapter dscmd = new SqlDataAdapter(sql, cnn);
DataSet ds = new DataSet();
dscmd.Fill(ds);
for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
for (j = 0; j <= ds.Tables[0].Columns.Count - 1; j++)
{
data = ds.Tables[0].Rows[i].ItemArray[j].ToString();
xlWorkSheet.Cells[i + 1, j + 1] = data;
}
}
xlWorkBook.SaveAs(path+".xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
releaseObject(xlWorkSheet);
releaseObject(xlWorkBook);
releaseObject(xlApp);
//MessageBox.Show("Excel file created , you can find the file c:\\csharp.net-informations.xls");
}
private void releaseObject(object obj)
{
try
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
obj = null;
}
catch (Exception ex)
{
obj = null;
//MessageBox.Show("Exception Occured while releasing object " + ex.ToString());
}
finally
{
GC.Collect();
}
}
protectedvoid导出\u单击(对象发送方,事件参数e)
{
字符串sql=null;
字符串数据=null;
字符串路径=另存为.Text;
int i=0;
int j=0;
Excel.applicationxlapp;
Excel.工作簿;
Excel工作表;
对象错误值=System.Reflection.Missing.Value;
xlApp=new Excel.ApplicationClass();
xlWorkBook=xlApp.Workbooks.Add(错误值);
xlWorkSheet=(Excel.Worksheet)xlWorkBook.Worksheets.get_项(1);
//connectionString=“数据源=服务器名;初始目录=数据库名;用户id=用户名;密码=密码;”;
SqlConnection cnn=新的SqlConnection(GetConnectionString());
cnn.Open();
sql=“选择故事,从故事创建日期”;
SqlDataAdapter dscmd=新的SqlDataAdapter(sql,cnn);
数据集ds=新数据集();
dscmd.Fill(ds);
对于(i=0;i您可以根据您的需求执行内部或外部操作来获取数据
// your sql query would be look like this
sql = "SELECT Story, CreationDate, otherTableColumn_1 FROM Story inner join otherTable on Story.commonField = otherTable.commonField";
否则,如果表之间不相关,那么您可以通过此
// your sql query would be look like this
sql = "SELECT Story, CreationDate, otherTableColumn_1 FROM Story, otherTable";
下面是在客户端系统上显示SaveAs对话框来保存excel工作表
Response.Clear();
Response.ContentType = "application/vnd.ms-excel";
Response.AddHeader("Content-Disposition", "attachment; filename=" yourfilename.xls");
// specify excel file format, could be 2000, XP, 2003, e.t.c
workbook.SaveToStream(Response.OutputStream, FileFormat.XLS97);
Response.End();
另一种解决方案是检索任意多个数据集,并将它们导出到同一ExcelApp中的不同工作簿中。为此,应将Excel.Application xlApp
作为全局变量取出
关于保存步骤和消息框的东西,只需按照这个非常方便。我昨天刚刚测试过它,它很甜
这应该是这样的:
DialogResult iRet = MessageBox.Show( sMsg, "Save Data?",
MessageBoxButtons.YesNo );
if (iRet == DialogResult.Yes)
xlWorkBook.SaveAs(path+".xls",
Excel.XlFileFormat.xlWorkbookNormal, etc...);
在ASP.NET环境中执行办公自动化是不安全的。相反,您应该生成一个csv、html表或xlsx文件并将其发送到客户端。对于xlsx,您可以使用Office Open XML SDK稍微简化一些事情
正如Samuel Neff所说,避免办公室自动化,这很容易出错,而且需要在运行代码的计算机上安装Office。Open Office XML SDK不需要安装Office。我使用了EPPlus库,这使得使用OO XML SDK非常容易。