[英]Why doesn't asp.net download work?
我正在使用此代碼下載圖像,即我將具有擴展名的圖像名稱存儲在數據庫中,並在此處獲取。
此代碼不會引發錯誤,但不會下載任何內容。 為什么呢?
try {
if (e.CommandName == "Download")
{
string ImgPath = Convert.ToString(r["Attachment"]);
//string ImgName = r["ComplaintDetailID"].ToString() + "-" + r["LetterNo"].ToString() + "-" + DateTime.Now.ToString("ddMMyyyyhhmmss");
//string filePath = ImgName + ".jpg";
string fullFilePath = Server.MapPath("~/SiteImages/CMS/" + ImgPath);
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(fullFilePath));
Response.ContentType = ContentType;
Response.TransmitFile(fullFilePath); //downloads file
Response.Flush();
//FileInfo file = new FileInfo(fullFilePath);
//file.Delete(); //deletes file after downloading
}
}
catch (Exception ex)
{
ResultLabel.ResultLabelAttributes(ex.Message, ProjectUserControls.Enums.ResultLabel_Color.Red);
}
finally
{
ResultPanel.Controls.Add(ResultLabel);
}
更新:
我試過了,但沒有用。
if (e.CommandName == "Download")
{
string ImgPath = Convert.ToString(r["Attachment"]);
//string ImgName = r["ComplaintDetailID"].ToString() + "-" + r["LetterNo"].ToString() + "-" + DateTime.Now.ToString("ddMMyyyyhhmmss");
//string filePath = ImgName + ".jpg";
MemoryStream m = new MemoryStream();
File.OpenRead(ImgPath).CopyTo(m);
m.WriteTo(Response.OutputStream);
string fullFilePath = Server.MapPath("~/SiteImages/CMS/" + ImgPath);
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(fullFilePath));
Response.ContentType = ContentType;
Response.TransmitFile(fullFilePath); //downloads file
Response.Flush();
//FileInfo file = new FileInfo(fullFilePath);
//file.Delete(); //deletes file after downloading
}
使用以下代碼創建流
MemoryStream m = new MemoryStream();
File.OpenRead(ImgPath ).CopyTo(m);
m.WriteTo(Response.OutputStream);
您使用TransmitFile
的方向正確。 檢查這一行:
Response.ContentType = ContentType;
看起來您要將ContentType
設置為頁面的默認值。
嘗試明確指定它:
Response.ContentType = "image/jpeg";
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