我在单个XL文件中导出三个工作表，但我在第二个DataTable（Education Details表）和第三个DataTable（Employeement Details中缺少一些用户数据片）。
Education Details表单中有些用户不在，但是用户正在显示的Employeement Details表单。用户电子邮件ID是全部三个数据库表。
DataSe ds = new DataSet();
DataTable dt = new DataTable("Registration Details");
DataTable dt1 = new DataTable("Education Details");
DataTable dt2 = new DataTable("Employeement Details");
dt = bl.Get_Registrationdetailsbydate(bo);
gv_Regdetails.DataSource = dt;
gv_Regdetails.DataBind();
dt1 = bl.Get_Registrationdetailsbydate1(bo);
dt2 = bl.Get_Registrationdetailsbydate2(bo);
DataTable filteredEducation = dt1.AsEnumerable()
.Where(x => dt.AsEnumerable()
.Any(z => z.Field<string>("Email").Trim() == x.Field<string>("Email").Trim()))
.CopyToDataTable();
DataTable filteredEmployee = dt2.AsEnumerable()
.Where(x => dt.AsEnumerable()
.Any(z => z.Field<string>("Email").Trim() == x.Field<string>("Email").Trim()))
.CopyToDataTable();
dt.TableName = "Registration Details";
filteredEducation.TableName = "Education Details";
filteredEmployee.TableName = "Employeement Details";
ds.Tables.Add(dt);
ds.Tables.Add(filteredEducation);
ds.Tables.Add(filteredEmployee);
ExcelHelper.ToExcel(ds, "DangoteUsers.xls", Page.Response);
我的结果基于第一个DataTable用户Email，然后根据第一个DataTable DataTable个ID填充第二个Email详细信息用户。与Employment Details相同。第一个DataTable和第二个DataTable中的问题。我也没有退回DataTable。
我引用this example
答案 0 :(得分：3)
问题来自于文章中从DataSet到Excel的转换解决方案。使用这种自制转换不是一个好主意。使用Jet/ACE engine或Microsoft Office Interop。至少他们保证，他们不会有这样的错误，将来会变得更多。更好地使用已经被社区高度接受的东西。在这里，我写了一个方法，如何使用Interop。
首先，您需要添加对Microsoft.Office.Interop.Excel的引用。以下是如何执行此操作，取自msdn article
添加Excel程序集作为项目的引用：右键单击 在项目中，选择Add Reference。
单击“添加引用”对话框的“COM”选项卡，然后找到Microsoft Excel 11对象库。
双击Microsoft Excel 11对象库，然后 按OK。
显然，如果您有更大版本的Excel 11，请使用它。
这是代码，有评论/区域及其工作流程。您应该使用using Excel = Microsoft.Office.Interop.Excel;作为参考
public void ExcelBtn_Click(object sender, EventArgs e)
{
DataSet dst = PrepareData();
byte[] bytes = ExportDataSetToExcel(dst);
Response.ClearContent();
Response.ContentType = "application/msoffice";
Response.AddHeader("Content-Disposition", @"attachment; filename=""ExportedExcel.xlsx"" ");
Response.BinaryWrite(bytes);
Response.End();
}
public static DataSet PrepareData()
{
DataTable badBoysDst = new DataTable("BadBoys");
badBoysDst.Columns.Add("Nr");
badBoysDst.Columns.Add("Name");
badBoysDst.Rows.Add(1, "Me");
badBoysDst.Rows.Add(2, "You");
badBoysDst.Rows.Add(3, "Pepe");
badBoysDst.Rows.Add(4, "Roni");
//Create a Department Table
DataTable goodBoysDst = new DataTable("GoodBoys");
goodBoysDst.Columns.Add("Nr");
goodBoysDst.Columns.Add("Name");
goodBoysDst.Rows.Add("1", "Not me");
goodBoysDst.Rows.Add("2", "Not you");
goodBoysDst.Rows.Add("3", "Quattro");
goodBoysDst.Rows.Add("4", "Stagioni");
DataTable goodBoysDst2 = new DataTable("GoodBoys2");
goodBoysDst2.Columns.Add("Nr");
goodBoysDst2.Columns.Add("Name");
goodBoysDst2.Rows.Add("1", "Not me");
goodBoysDst2.Rows.Add("2", "Not you");
goodBoysDst2.Rows.Add("3", "Quattro");
goodBoysDst2.Rows.Add("4", "Stagioni");
DataTable goodBoysDst3 = new DataTable("GoodBoys3");
goodBoysDst3.Columns.Add("Nr");
goodBoysDst3.Columns.Add("Name");
goodBoysDst3.Rows.Add("1", "Not me");
goodBoysDst3.Rows.Add("2", "Not you");
goodBoysDst3.Rows.Add("3", "Quattro");
goodBoysDst3.Rows.Add("4", "Stagioni");
//Create a DataSet with the existing DataTables
DataSet dst = new DataSet("SchoolBoys");
dst.Tables.Add(badBoysDst);
dst.Tables.Add(goodBoysDst);
dst.Tables.Add(goodBoysDst2);
dst.Tables.Add(goodBoysDst3);
return dst;
}
public static byte[] ExportDataSetToExcel(DataSet dst)
{
#region Create The Excel
Excel.Application excelApp = null;
Excel.Workbook excelWorkBook = null;
try
{
excelApp = new Excel.Application();
if (excelApp == null)
throw new Exception("You can throw custom exception here too");
excelWorkBook = excelApp.Workbooks.Add();
int sheetNr = 1;
foreach (DataTable table in dst.Tables)
{
Excel.Worksheet excelWorkSheet = null;
//Add a new worksheet or reuse first 3 sheets of workbook with the Datatable name
if (sheetNr <= excelWorkBook.Sheets.Count)
{
excelWorkSheet = excelWorkBook.Sheets.get_Item(sheetNr);
}
else
{
excelWorkSheet = excelWorkBook.Sheets.Add(After: excelWorkBook.Sheets[excelWorkBook.Sheets.Count]);
}
excelWorkSheet.Name = table.TableName;
for (int i = 1; i < table.Columns.Count + 1; i++)
{
excelWorkSheet.Cells[1, i] = table.Columns[i - 1].ColumnName;
}
for (int j = 0; j < table.Rows.Count; j++)
{
for (int k = 0; k < table.Columns.Count; k++)
{
excelWorkSheet.Cells[j + 2, k + 1] = table.Rows[j].ItemArray[k].ToString();
}
}
sheetNr += 1;
}
//make first sheet active
excelApp.ActiveWorkbook.Sheets[1].Select();
excelWorkBook.SaveAs(@"c:\temp\DataSetToExcel.xlsx");
}
finally
{
excelWorkBook.Close();
excelApp.Quit();
//you should call GC here because there is memory problem with Interop
GC.Collect();
GC.WaitForPendingFinalizers();
}
#endregion
#region Take byte[] of the excel
byte[] result = null;
using (FileStream fs = new FileStream(@"c:\temp\DataSetToExcel.xlsx", FileMode.Open, FileAccess.Read))
{
BinaryReader reader = new BinaryReader(fs);
result = reader.ReadBytes((int)fs.Length);
}
#endregion
#region Delete the excel from the server
File.Delete(@"c:\temp\DataSetToExcel.xlsx");
#endregion
return result;
}
}
所以尝试使用已经由社区建立的东西。这是如何使用Interop完成的完整示例。 我个人更喜欢使用ACE / JET引擎，因为Interop中没有内存泄漏问题（因为我们在代码中调用了GC）。使用ACE / JET引擎创建新工作表有点困难。
答案 1 :(得分：1)
我认为您在linq查询中的字符串比较是一个问题..您的电子邮件地址可能有不同的情况可能导致此问题。请尝试下面的代码
DataTable filteredEducation = dt1.AsEnumerable()
.Where(x => dt.AsEnumerable()
.Any(z => z.Field<string>("Email").Trim().Equals(x.Field<string>("Email").Trim(),StringComparison.CurrentCultureIgnoreCase)))
.CopyToDataTable();
DataTable filteredEmployee = dt2.AsEnumerable()
.Where(x => dt.AsEnumerable()
.Any(z => z.Field<string>("Email").Trim().Equals(x.Field<string>("Email").Trim(),StringComparison.CurrentCultureIgnoreCase)))
.CopyToDataTable();
答案 2 :(得分：0)
我通过手动导出完成了相同的导出问题。首先，我需要正确准备响应http响应，而不是添加表的所有标头（包含rowsapn和colspan属性），然后填充数据：
//this fun is called after click on export button for example
public void Export(string fileName, GridView gv)
{
try
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", String.Format("{0}.xls", fileName)));
HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "utf-8");
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
HttpContext.Current.Response.Write(@"<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">");
HttpContext.Current.Response.Charset = "utf-8";//"windows-1251";//
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
// Create a table to contain the grid
Table table = new Table();
table.Width = Unit.Percentage(100);
// include the gridline settings
table.GridLines = gv.GridLines;
//header
TableRow r = new TableRow();
TableCell cell = new TableCell()
{
ColumnSpan = 18,
Text = fileName,
BackColor = Color.LightGray,
HorizontalAlign = HorizontalAlign.Center
};
cell.Font.Size = new FontUnit(14);
r.Cells.Add(cell);
table.Rows.Add(r);
GridViewRow row;
int rowSpan = 0;
//second row
row = CreateSecondHeaderRow();
table.Rows.AddAt(1, row);
//first row
row = CreateFirstHeaderRow(row, rowSpan);
table.Rows.AddAt(1, row);
// add each of the data rows to the table
for (int j = 0; j < gv.Rows.Count; j++)
{
//Set the default color
gv.Rows[j].BackColor = System.Drawing.Color.White;
for (int i = 0; i < gv.Rows[j].Cells.Count; i++)
{
gv.Rows[j].Cells[i].BackColor = System.Drawing.Color.White;
gv.Rows[j].Cells[i].Width = gv.Columns[i].ItemStyle.Width;
gv.Rows[j].Cells[i].Font.Size = gv.Columns[i].ItemStyle.Font.Size;
gv.Rows[j].Cells[i].Font.Bold = gv.Columns[i].ItemStyle.Font.Bold;
gv.Rows[j].Cells[i].Font.Italic = gv.Columns[i].ItemStyle.Font.Italic;
//aligh
if (i == 0)
{
gv.Rows[j].Cells[i].Style["text-align"] = "center";
}
else
{
gv.Rows[j].Cells[i].Style["text-align"] = "right";
}
//for alternate
if (j % 2 != 1) gv.Rows[j].Cells[i].BackColor = Color.LightSteelBlue;
}
table.Rows.Add(gv.Rows[j]);
}
table.RenderControl(htw);
// render the htmlwriter into the response
HttpContext.Current.Response.Write(sw);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
}
}
}
catch (Exception ex)
{
this._hasError = true;
ShowError(ex);
}
}
private TableHeaderCell CreateHeaderCell(string text = null, int rowSpan = 0, int columnSpan = 0, Color backColor = default(Color), Color foreColor = default(Color))
{
if (object.Equals(backColor, default(Color))) backColor = Color.LightGray;
if (object.Equals(foreColor, default(Color))) foreColor = Color.Black;
return new TableHeaderCell
{
RowSpan = rowSpan,
ColumnSpan = columnSpan,
Text = text,
BackColor = backColor
};
}
private GridViewRow CreateFirstHeaderRow(GridViewRow row, int rowSpan)
{
row = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert);
TableHeaderCell cell = CreateHeaderCell("Surplus %");
row.Controls.Add(cell);
cell = CreateHeaderCell("The date", columnSpan: 2);
row.Controls.Add(cell);
if (this.WithQuantity)
{
cell = CreateHeaderCell("Total Quantity", 2 + rowSpan, backColor: Color.Yellow);
row.Controls.Add(cell);
}
cell = CreateHeaderCell("Total Amount", 2 + rowSpan);
row.Controls.Add(cell);
cell = CreateHeaderCell("Has elapsed periods from start", columnSpan: (this.WithQuantity ? (SurplusUtil.TheColumnsNumbers * 2) : SurplusUtil.TheColumnsNumbers));
row.Controls.Add(cell);
if (this.WithQuantity)
{
cell = CreateHeaderCell("Quantity <br style='mso-data-placement:same-cell;' /> surplus", 2 + rowSpan, backColor: Color.Yellow);
row.Controls.Add(cell);
}
cell = CreateHeaderCell("Principal <br style='mso-data-placement:same-cell;' /> surplus", 2 + rowSpan);
row.Controls.Add(cell);
return row;
}
private GridViewRow CreateSecondHeaderRow()
{
GridViewRow row = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert);
TableHeaderCell cell = CreateHeaderCell("Period number", rowSpan: ((this.WithQuantity) ? 2 : 0));
row.Controls.Add(cell);
cell = CreateHeaderCell("from", rowSpan: ((this.WithQuantity) ? 2 : 0));
row.Controls.Add(cell);
cell = CreateHeaderCell("to", rowSpan: ((this.WithQuantity) ? 2 : 0));
row.Controls.Add(cell);
for (int i = 0; i < SurplusUtil.TheColumnsNumbers; i++)
{
cell = CreateHeaderCell(i.ToString(),
columnSpan: ((this.WithQuantity) ? 2 : 0),
backColor: System.Drawing.Color.FromArgb(198, 239, 206),
foreColor: System.Drawing.Color.FromArgb(0, 97, 0));
row.Controls.Add(cell);
}
return row;
}