【IT168技术文档】
ASP.NET中通过对话框方式下载文件
1 通过探出对话框提示文件下载或打开
2 通过自定义Header让特定的应用程序打开文件
使用的方法:Response.TransmitFile()
例程:
流传送所使用的方法:Response.BinaryWrite()和Response.OutputStream()Response.ContentType = “image/jpeg”; Response.AppendHeader(“Content-Disposition”,”attachment; filename=SailBig.jpg”); Response.TransmitFile( Server.MapPath(“~/images/sailbig.jpg”) );
例程:
常见问题解决方案:Bitmap bmp = wwWebUtils.CornerImage(backcolor, color, c, Radius, Height, Width); Response.ContentType = “image/jpeg”; Response.AppendHeader(“Content-Disposition”,”attenment; filename=LeftCorner.jpg”); bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
1、当从资源文件或者数据库BLOB字段载入图像出现错误
错误内容:A generic error occurred in GDI+
代码:
解决方法,再创建一个实例接收从资源文件或者数据库BLOB字段读入的图像内容。Bitmap bmp = this.GetGlobalResourceObject(“Resource”,”_BitMap”) as Bitmap; Response.ContentType=”image/jpeg”; bmp.Save(Response.OutputStream, ImageFormat.Jpeg); Response.End();
解决方案代码:
Bitmap bmp = this.GetGlobalResourceObject(“Resource”, ”_BitMap”) as Bitmap; Bitmap temp = new Bitmap(bmp); Response.ContentType = “image/jpeg”; Temp.Save(Response.OutputStream, ImageFormat.Jpeg); bmp.Dispose(); temp.Dispose(); Response.End();