如何使下载图像链接工作
本文关键字:链接 工作 图像 下载 何使 | 更新日期: 2023-09-27 18:02:07
我的viewdepositslip的代码如下:其中,它显示了存储上传文件的文件夹中的图像:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" EmptyDataText = "No files uploaded">
<Columns>
<asp:BoundField DataField="Text" HeaderText="File Name" />
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lnkDownload" Text = "Download" CommandArgument = '<%# Eval("Value") %>' runat="server" OnClick = "DownloadFile"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID = "lnkDelete" Text = "Delete" CommandArgument = '<%# Eval("Value") %>' runat = "server" OnClick = "DeleteFile" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
这是我上传图片到文件夹的代码(这是从客户端,一个不同的webform)。
protected void UploadFile(object sender, EventArgs e)
{
string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Uploads/") + fileName);
Response.Redirect(Request.Url.AbsoluteUri);
}
,这是后面的代码。好吧,删除按钮功能完美,但我不能使下载链接功能工作。我遗漏了什么?
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string[] filePaths = Directory.GetFiles(Server.MapPath("~/BankDepositUploads/"));
List<ListItem> files = new List<ListItem>();
foreach (string filePath in filePaths)
{
files.Add(new ListItem(Path.GetFileName(filePath), filePath));
}
GridView1.DataSource = files;
GridView1.DataBind();
}
protected void DownloadFile(object sender, EventArgs e)
{
string filePath = (sender as LinkButton).CommandArgument;
Response.ContentType = ContentType;
Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(filePath));
Response.WriteFile(filePath);
Response.End();
}
protected void DeleteFile(object sender, EventArgs e)
{
string filePath = (sender as LinkButton).CommandArgument;
File.Delete(filePath);
Response.Redirect(Request.Url.AbsoluteUri);
}
我也计划看到实际的图像,一旦它显示在网格视图。到目前为止,它有图像url。
你的代码也应该工作,但由于任何原因,它可能无法工作,所以尝试这样做:
aspx page
<asp:LinkButton ID="lnkDownload" runat="server" CommandName="cmd">Download</asp:LinkButton>
CS页
protected void GridView1_RowCommand(object sender, System.Web.UI.WebControls.GridViewCommandEventArgs e)
{
if (e.CommandName == "cmd")
{
string filePath = (sender as LinkButton).CommandArgument;
Response.ContentType = ContentType;
Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(filePath));
Response.WriteFile(filePath);
Response.End();
}
}
编辑:- 既然你正在使用更新面板,那么你有做回发时,点击链接按钮。有很多方法可以做到这一点。我从两个方面解释。将此代码放在页面加载
处ScriptManager.GetCurrent(this).RegisterPostBackControl(this.GridView1);
或者在aspx页面中使用触发器,</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="GridView1" />
</Triggers>