ASP.NET MVC 使用NPOI导出Excel 无法访问已关闭的流(转)

 第一步重写MemoryStream , 让它不能自动关闭.

//新建类 重写Npoi流方法
public class NpoiMemoryStream : MemoryStream
    {
        public NpoiMemoryStream()
        {
            AllowClose = true;
        }

        public bool AllowClose { get; set; }

        public override void Close()
        {
            if (AllowClose)
                base.Close();
        }
}

 第二部 控制一下.

//导出Excel文件的方法
var ms = new NpoiMemoryStream();
ms.AllowClose = false;
workbook.Write(ms);
ms.Flush();
ms.Seek(0, SeekOrigin.Begin);
ms.AllowClose = true;

return File(ms, "application/vnd.ms-excel","某某.xlsx");

转载: http://www.cnblogs.com/codedreams/p/5662740.html