主要用了2種方式來實作。
1.格式不做限制,普通清單顯示
/// <summary>
/// 常用方法,列之間加\t,一行一行輸出,此檔案其實是csv檔案,不過預設可以當成Excel打開。
/// </summary>
/// <remarks>
/// using System.IO;
/// </remarks>
/// <param name="dgv"></param>
private void DataGridViewToExcel(DataGridView dgv)
{
SaveFileDialog dlg = new SaveFileDialog();
dlg.Filter = "Execl files (*.xls)|*.xls";
dlg.FilterIndex = 0;
dlg.RestoreDirectory = true;
dlg.CreatePrompt = true;
dlg.Title = "儲存為Excel檔案";
if (dlg.ShowDialog() == DialogResult.OK)
{
Stream myStream;
myStream = dlg.OpenFile();
StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
string columnTitle = "";
try
{
//寫入列标題
for (int i = 0; i < dgv.ColumnCount; i++)
{
if (i > 0)
{
columnTitle += "\t";
}
columnTitle += dgv.Columns[i].HeaderText;
}
sw.WriteLine(columnTitle);
//寫入列内容
for (int j = 0; j < dgv.Rows.Count; j++)
{
string columnValue = "";
for (int k = 0; k < dgv.Columns.Count; k++)
{
if (k > 0)
{
columnValue += "\t";
}
if (dgv.Rows[j].Cells[k].Value == null)
columnValue += "";
else
columnValue += dgv.Rows[j].Cells[k].Value.ToString().Trim();
}
sw.WriteLine(columnValue);
}
sw.Close();
myStream.Close();
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
finally
{
sw.Close();
myStream.Close();
}
}
}
對于複雜的,對于導出的excel有格式限制,可以考慮用Excel模闆(XML支援)來實作。
/// <summary>
/// 将DataGridView中的資料導入到Excel中
/// </summary>
/// <param name="dt">DataGridView</param>
/// <param name="templatePath">模闆的路徑</param>
/// <param name="excelName">導入Excel的路徑</param>
/// <returns></returns>
public static bool DataGridViewToExcel(DataGridView dg, string templatePath, string excelName)
{
bool result = true;
XmlDocument xmlDoc = new XmlDocument();
if (File.Exists(templatePath))
{
xmlDoc.Load(templatePath);
XmlNode root = xmlDoc.SelectSingleNode(@"/*[local-name()='Workbook']/*[local-name()='Worksheet'][1]/*[local-name()='Table']");
foreach (DataGridViewRow dgRow in dg.Rows)
{
XmlElement row = xmlDoc.CreateElement("", "Row", "urn:schemas-microsoft-com:office:spreadsheet");
row.SetAttribute("AutoFitHeight", "urn:schemas-microsoft-com:office:spreadsheet", "0");
foreach (DataGridViewColumn dgcol in dg.Columns)
{
if (dgcol.Visible && dgcol.IsDataBound && dgcol.GetType().Name == "DataGridViewTextBoxColumn")
{
XmlElement cell = xmlDoc.CreateElement("", "Cell", "urn:schemas-microsoft-com:office:spreadsheet");
XmlElement data = xmlDoc.CreateElement("", "Data", "urn:schemas-microsoft-com:office:spreadsheet");
data.SetAttribute("Type", "urn:schemas-microsoft-com:office:spreadsheet", "String");
data.InnerText = StringUility.ReturnFormatString(dgRow.Cells[dgcol.Name].Value);
cell.AppendChild(data);
row.AppendChild(cell);
}
}
//root.InsertBefore(row, root.LastChild);
root.AppendChild(row);
}
#region 添加合計行
XmlElement totalRow = xmlDoc.CreateElement("", "Row", "urn:schemas-microsoft-com:office:spreadsheet");
totalRow.SetAttribute("AutoFitHeight", "urn:schemas-microsoft-com:office:spreadsheet", "0");
for (int i = 0; i < 2; i++)
{
XmlElement cell = xmlDoc.CreateElement("", "Cell", "urn:schemas-microsoft-com:office:spreadsheet");
XmlElement data = xmlDoc.CreateElement("", "Data", "urn:schemas-microsoft-com:office:spreadsheet");
data.SetAttribute("Type", "urn:schemas-microsoft-com:office:spreadsheet", i == 0 ? "String" : "Number");
data.InnerText =(i==0?"合計":dg.Rows.Count.ToString());
cell.AppendChild(data);
totalRow.AppendChild(cell);
}
root.AppendChild(totalRow);
#endregion
XmlNode countnode = xmlDoc.SelectSingleNode(@"/*[local-name()='Workbook']/*[local-name()='Worksheet'][1]/*[local-name()='Table']");
countnode.Attributes["ss:ExpandedRowCount"].Value = (Int32.Parse(countnode.Attributes["ss:ExpandedRowCount"].Value) + dg.Rows.Count+1).ToString();//标題+合計+資料
xmlDoc.Save(excelName);
result = true;
}
else
{
result = false;
}
return result;
}
另外還有通過Microsoft Excel 11.0(12) Object Library,使用using Excel=Microsoft.Office.Interop.Excel調用CoM來實作。但必須有要求是安裝該軟體的應用程式必須裝Microsoft Office Excel才行。而且還應該設定運作該軟體的程式對COM有通路權限。