/// <summary>
/// 打开系统对话框选择一个文件。
/// </summary>
/// <returns></returns>
public static System.IO.FileInfo SelectFile()
{
System.IO.FileInfo theFile = null;
// 在WPF中， OpenFileDialog位于Microsoft.Win32名称空间
OpenFileDialog dialog = new OpenFileDialog
{
Filter = "工作文档|*.doc;*.docx;*.xls;*.xlsx;*.ppt;*.pptx;*.wps;*.pdf;*.jpg;*.jpeg;*.png;*.gif;|压缩文档|*.rar;*.zip|所有文件|*.*"
};
if (dialog.ShowDialog() == true)
{
try
{
theFile = new System.IO.FileInfo(dialog.FileName);
if (theFile.Length > 1073741824)//1G
{
AppFuns.ShowMessage("文件大于1G,无法保存！");
return(null);
}
}
catch (Exception Error)
{
AppFuns.ShowMessage($"读取文件出错(正在使用？){Error.Message}");
return(null);
}
}
return(theFile);
}
/// <summary>
/// NPOI导出Excel，不依赖本地是否装有Excel，导出速度快
/// </summary>
/// <param name="dataGridView1">要导出的dataGridView控件</param>
/// <param name="sheetName">sheet表名</param>
private void ExportToExcel(List <Lib.MemberInfoEntity> EntityList, string sheetName)
{
if (EntityList == null || EntityList.Count < 1)
{
return;
}
System.Windows.Forms.SaveFileDialog fileDialog = new System.Windows.Forms.SaveFileDialog();
fileDialog.Filter = "Excel|*.xls";
if (fileDialog.ShowDialog() == System.Windows.Forms.DialogResult.Cancel)
{
return;
}
//不允许dataGridView显示添加行，负责导出时会报最后一行未实例化错误
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet(sheetName);
IRow rowHead = sheet.CreateRow(0);
PropertyInfo[] EntityProps = EntityList[0].GetType().GetProperties();
//填写表头
for (int i = 0; i < EntityProps.Count(); i++)
{
rowHead.CreateCell(i, CellType.String).SetCellValue(EntityProps[i].Name);
}
//填写内容
for (int i = 0; i < EntityList.Count; i++)
{
IRow row = sheet.CreateRow(i + 1);
for (int j = 0; j < EntityProps.Count(); j++)
{
object TempObj = EntityProps[j].GetValue(EntityList[i]);
if (TempObj != null)
{
row.CreateCell(j, CellType.String).SetCellValue(EntityProps[j].GetValue(EntityList[i]).ToString());
}
else
{
row.CreateCell(j, CellType.String).SetCellValue("");
}
}
}
using (FileStream stream = File.OpenWrite(fileDialog.FileName))
{
workbook.Write(stream);
stream.Close();
}
AppFuns.ShowMessage("导出数据成功!", "提示");
GC.Collect();
}
