asp.net DataGridView匯出到Excel的三個方法[親測]

#region DataGridView資料顯示到Excel
/// <summary>
/// 開啟Excel並將DataGridView控制項中資料匯出到Excel
/// </summary>
/// <param name="dgv">DataGridView對象 </param>
/// <param name="isShowExcle">是否顯示Excel介面 </param>
/// <remarks>
/// add com "Microsoft Excel 11.0 Object Library"
/// using Excel=Microsoft.Office.Interop.Excel;
/// </remarks>
/// <returns> </returns>
public bool DataGridviewShowToExcel(DataGridView dgv, bool isShowExcle)
{
if (dgv.Rows.Count == 0)
return false;
//建立Excel對象
Excel.Application excel = new Excel.Application();
excel.Application.Workbooks.Add(true);
excel.Visible = isShowExcle;
//產生欄位名稱
for (int i = 0; i < dgv.ColumnCount; i++)
{
excel.Cells[1, i + 1] = dgv.Columns[i].HeaderText;
}
//填充資料
for (int i = 0; i < dgv.RowCount - 1; i++)
{
for (int j = 0; j < dgv.ColumnCount; j++)
{
if (dgv[j, i].ValueType == typeof(string))
{
excel.Cells[i + 2, j + 1] = "'" + dgv[j, i].Value.ToString();
}
else
{
excel.Cells[i + 2, j + 1] = dgv[j, i].Value.ToString();
}
}
}
return true;
}
#endregion

#region DateGridView匯出到csv格式的Excel
/// <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開啟。
/// </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
{
//寫入欄位標題
for (int i = 0; i < dgv.ColumnCount; i++)
{
if (i > 0)
{
columnTitle += "\t";
}
columnTitle += dgv.Columns[i].HeaderText;
}
sw.WriteLine(columnTitle);

//寫入列內容
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();
}
}
}
#endregion

#region DataGridView匯出到Excel，有一定的判斷性
/// <summary>
///方法，匯出DataGridView中的資料到Excel檔案
/// </summary>
/// <remarks>
/// add com "Microsoft Excel 11.0 Object Library"
/// using Excel=Microsoft.Office.Interop.Excel;
/// using System.Reflection;
/// </remarks>
/// <param name= "dgv"> DataGridView </param>
public static void DataGridViewToExcel(DataGridView dgv)
{

#region 驗證可操作性

//申明儲存對話方塊
SaveFileDialog dlg = new SaveFileDialog();
//默然檔案尾碼
dlg.DefaultExt = "xls ";
//檔案尾碼列表
dlg.Filter = "EXCEL檔案(*.XLS)|*.xls ";
//默然路徑是系統當前路徑
dlg.InitialDirectory = Directory.GetCurrentDirectory();
//開啟儲存對話方塊
if (dlg.ShowDialog() == DialogResult.Cancel) return;
//返迴文件路徑
string fileNameString = dlg.FileName;
//驗證strFileName是否為空白或值無效
if (fileNameString.Trim() == " ")
{ return; }
//定義表格內資料的行數和列數
int rowscount = dgv.Rows.Count;
int colscount = dgv.Columns.Count;
//行數必須大於0
if (rowscount <= 0)
{
MessageBox.Show("沒有資料可供儲存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}

//列數必須大於0
if (colscount <= 0)
{
MessageBox.Show("沒有資料可供儲存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}

//行數不可以大於65536
if (rowscount > 65536)
{
MessageBox.Show("資料記錄數太多(最多不能超過65536條)，不能儲存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}

//列數不可以大於255
if (colscount > 255)
{
MessageBox.Show("資料記錄行數太多，不能儲存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}

//驗證以fileNameString命名的檔案是否存在，如果存在刪除它
FileInfo file = new FileInfo(fileNameString);
if (file.Exists)
{
try
{
file.Delete();
}
catch (Exception error)
{
MessageBox.Show(error.Message, "刪除失敗 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
}
#endregion
Excel.Application objExcel = null;
Excel.Workbook objWorkbook = null;
Excel.Worksheet objsheet = null;
try
{
//申明對象
objExcel = new Microsoft.Office.Interop.Excel.Application();
objWorkbook = objExcel.Workbooks.Add(Missing.Value);
objsheet = (Excel.Worksheet)objWorkbook.ActiveSheet;
//設定EXCEL不可見
objExcel.Visible = false;

//向Excel中寫入表格的表頭
int displayColumnsCount = 1;
for (int i = 0; i <= dgv.ColumnCount - 1; i++)
{
if (dgv.Columns[i].Visible == true)
{
objExcel.Cells[1, displayColumnsCount] = dgv.Columns[i].HeaderText.Trim();
displayColumnsCount++;
}
}
//設定進度條
//tempProgressBar.Refresh();
//tempProgressBar.Visible = true;
//tempProgressBar.Minimum=1;
//tempProgressBar.Maximum=dgv.RowCount;
//tempProgressBar.Step=1;
//向Excel中逐行逐列寫入表格中的資料
for (int row = 0; row <= dgv.RowCount - 1; row++)
{
//tempProgressBar.PerformStep();

displayColumnsCount = 1;
for (int col = 0; col < colscount; col++)
{
if (dgv.Columns[col].Visible == true)
{
try
{
objExcel.Cells[row + 2, displayColumnsCount] = dgv.Rows[row].Cells[col].Value.ToString().Trim();
displayColumnsCount++;
}
catch (Exception)
{

}

}
}
}
//隱藏進度條
//tempProgressBar.Visible = false;
//儲存檔案
objWorkbook.SaveAs(fileNameString, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Excel.XlSaveAsAccessMode.xlShared, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value);
}
catch (Exception error)
{
MessageBox.Show(error.Message, "警告 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
finally
{
//關閉Excel應用
if (objWorkbook != null) objWorkbook.Close(Missing.Value, Missing.Value, Missing.Value);
if (objExcel.Workbooks != null) objExcel.Workbooks.Close();
if (objExcel != null) objExcel.Quit();

objsheet = null;
objWorkbook = null;
objExcel = null;
}
MessageBox.Show(fileNameString + "\n\n匯出完畢! ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);

}

#endregion