1.新建窗体
我们需要新建一个Windows Form窗体，并在其中添加一个DataGridView控件，连接数据库读取数据表中的信息返回到DataGridView控件中，相信这一步都会做，我就不演示了，直接给出效果图:
2.添加引用
我们要实现数据导出到Excel这个功能，就需要引用一个命名空间，如图所示(如果没有这个dll可在我的资源中查找,我已上传过)：
3.在代码中添加命名空间：
4.代码
//查出的数据导出到excel表
private void button12_Click(object sender, EventArgs e)
{
string fileName = "";
string saveFileName = "";
SaveFileDialog saveDialog = new SaveFileDialog();
saveDialog.DefaultExt = "xlsx";
saveDialog.Filter = "Excel文件|*.xlsx";
saveDialog.FileName = fileName;
saveDialog.ShowDialog();
saveFileName = saveDialog.FileName;
if (saveFileName.IndexOf(":") < 0) return; //被点了取消
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
if (xlApp == null)
{
MessageBox.Show("无法创建Excel对象，您的电脑可能未安装Excel");
return;
}
Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
Microsoft.Office.Interop.Excel.Workbook workbook =
workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
Microsoft.Office.Interop.Excel.Worksheet worksheet =
(Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
//写入标题
for (int i = 0; i < dataGridView1.ColumnCount; i++)
{ worksheet.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText; }
//写入数值
for (int r = 0; r < dataGridView1.Rows.Count; r++)
{
for (int i = 0; i < dataGridView1.ColumnCount; i++)
{
worksheet.Cells[r + 2, i + 1] = dataGridView1.Rows[r].Cells[i].Value;
}
System.Windows.Forms.Application.DoEvents();
}
worksheet.Columns.EntireColumn.AutoFit();//列宽自适应
MessageBox.Show(fileName + "资料保存成功", "提示", MessageBoxButtons.OK);
if (saveFileName != "")
{
try
{
workbook.Saved = true;
workbook.SaveCopyAs(saveFileName); //fileSaved = true;
}
catch (Exception ex)
{//fileSaved = false;
MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
}
}
xlApp.Quit();
GC.Collect();//强行销毁
}
