в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

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2010-05-26T11:57:42Z

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== Saving uploaded Files to a Database==



<source lang="csharp">
<%@ Page Language="C#" %>
<%@ Import Namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void btnAdd_Click(object sender, EventArgs e)
{
if (upFile.HasFile)
{
srcFiles.Insert();
}
}

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<title>FileUpload Database</title>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblFile"
Text="Word Document:"
AssociatedControlID="upFile"
Runat="server" />
<asp:FileUpload
id="upFile"
Runat="server" />
<asp:Button
id="btnAdd"
Text="Add Document"
OnClick="btnAdd_Click"
Runat="server" />
<hr />
<asp:Repeater
id="rptFiles"
DataSourceID="srcFiles"
Runat="server">
<HeaderTemplate>
<ul class="fileList">
</HeaderTemplate>
<ItemTemplate>
<li>
<asp:HyperLink
id="lnkFile"
Text="<%#Eval("FileName")%>"
NavigateUrl="<%#Eval("Id", "~/FileHandler.ashx?id={0}")%>"
Runat="server" /> </li>
</ItemTemplate>
<FooterTemplate>
</ul>
</FooterTemplate>
</asp:Repeater>
<asp:SqlDataSource
id="srcFiles"
ConnectionString="Server=.\SQLExpress;Integrated Security=True;
AttachDbFileName=|DataDirectory|FilesDB.mdf;User Instance=True"
SelectCommand="SELECT Id,FileName FROM Files"
InsertCommand="INSERT Files (FileName,FileBytes) VALUES (@FileName,@FileBytes)"
Runat="server">
<InsertParameters>
<asp:ControlParameter Name="FileName" ControlID="upFile" PropertyName="FileName" />
<asp:ControlParameter Name="FileBytes" ControlID="upFile" PropertyName="FileBytes" />
</InsertParameters>
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
Table Structure
Column Name Data Type
Id Int (IDENTITY)
FileName NVarchar(50)
FileBytes Varbinary(max)
File: FileHandler.ashx
<%@ WebHandler Language="C#" Class="FileHandler" %>
using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
public class FileHandler : IHttpHandler {
const string conString = @"Server=.\SQLExpress;Integrated Security=True;
AttachDbFileName=|DataDirectory|FilesDB.mdf;User Instance=True";
public void ProcessRequest (HttpContext context) {
SqlConnection con = new SqlConnection(conString);
SqlCommand cmd = new SqlCommand("SELECT FileBytes FROM Files WHERE Id=@Id", con);
cmd.Parameters.AddWithValue("@Id", context.Request["Id"]);
using (con)
{
con.Open();
byte[] file = (byte[])cmd.ExecuteScalar();
context.Response.BinaryWrite(file);
}
}
public bool IsReusable {
get {
return false;
}
}
}</source>

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ASP.NET Tutorial/File Directory/Database Save Load - История изменений

в 15:30, 26 мая 2010

Admin: 1 версия