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在C#中,我們可以使用ASP.NET AJAX技術(shù)來(lái)處理文件上傳和下載。這里,我們將介紹一種簡(jiǎn)單的方法來(lái)實(shí)現(xiàn)這個(gè)功能。
首先,在HTML頁(yè)面中添加一個(gè)FileUpload控件和一個(gè)Button控件:
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click" />
接下來(lái),在服務(wù)器端代碼中編寫文件上傳的邏輯:
protected void btnUpload_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Uploads/") + fileName);
Response.Write("File Uploaded!");
}
else
{
Response.Write("Please Select File to Upload");
}
}
在HTML頁(yè)面中添加一個(gè)GridView控件和一個(gè)Button控件:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="Name" HeaderText="File Name" />
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lnkDownload" runat="server" Text="Download" OnClick="lnkDownload_Click"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button ID="btnShowFiles" runat="server" Text="Show Files" OnClick="btnShowFiles_Click" />
接下來(lái),在服務(wù)器端代碼中編寫文件下載的邏輯:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
LoadFiles();
}
}
private void LoadFiles()
{
string[] files = Directory.GetFiles(Server.MapPath("~/Uploads/"));
List<ListItem> items = new List<ListItem>();
foreach (string file in files)
{
items.Add(new ListItem(Path.GetFileName(file), file));
}
GridView1.DataSource = items;
GridView1.DataBind();
}
protected void lnkDownload_Click(object sender, EventArgs e)
{
LinkButton lnkbtn = sender as LinkButton;
GridViewRow gvrow = lnkbtn.NamingContainer as GridViewRow;
string filePath = GridView1.DataKeys[gvrow.RowIndex].Value.ToString();
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(filePath));
Response.TransmitFile(filePath);
Response.End();
}
protected void btnShowFiles_Click(object sender, EventArgs e)
{
LoadFiles();
}
這樣,我們就實(shí)現(xiàn)了使用C#和ASP.NET AJAX技術(shù)處理文件上傳和下載的功能。當(dāng)然,這只是一個(gè)簡(jiǎn)單的示例,你可以根據(jù)自己的需求進(jìn)行修改和優(yōu)化。
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