使用ASP.NET上传图片汇总(一)

来源：互联网发布：俊知集团谢志坚编辑：程序博客网时间：2024/06/05 04:38

1 使用标准HTML来进行图片上传

前台代码：

<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td colspan="2" style="height: 21px" >
使用标准HTML来进行图片上传</td>
</tr>
<tr>
<td style="width: 400px">
<input id="InputFile" style="width: 399px" type="file" runat="server" /></td>
<td style="width: 80px">
<asp:Button ID="UploadButton" runat="server" Text="上传图片" OnClick="UploadButton_Click" /></td>
</tr>
<tr>
<td colspan="2" >
<asp:Label ID="Lb_Info" runat="server" ForeColor="Red"></asp:Label></td>
</tr>
</table>
</div>
</form>
</body>

后台代码：

2 单文件上传

这是最基本的文件上传，在asp.net1.x中没有这个FileUpload控件，只有html的上传控件，那时候要把html控件转化为服务器控件，很不好用。其实所有文件上传的美丽效果都是从这个FileUpload控件衍生，第一个例子虽然简单却是根本。

前台代码：

<body>
<form id="form1" runat="server">
<div>
<table style="width: 90%">
<tr>
<td style="width: 159px" colspan=2>
<strong><span style="font-size: 10pt">最简单的单文件上传</span></strong></td>
</tr>
<tr>
<td style="width: 600px">
<asp:FileUpload ID="FileUpload1" runat="server" Width="600px" /></td>
<td align=left>
<asp:Button ID="FileUpload_Button" runat="server" Text="上传图片" OnClick="FileUpload_Button_Click" /></td>
</tr>
<tr>
<td colspan=2>
<asp:Label ID="Upload_info" runat="server" ForeColor="Red" Width="767px"></asp:Label></td>
</tr>
</table>
</div>
</form>
</body>

后台代码：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void FileUpload_Button_Click(object sender, EventArgs e)
{
try
{
if (FileUpload1.PostedFile.FileName == "")
//if (FileUpload1.FileName == "")
//if (!FileUpload1.HasFile) //获取一个值，该值指示 System.Web.UI.WebControls.FileUpload 控件是否包含文件。包含文件，则为 true；否则为 false。
{
this.Upload_info.Text = "请选择上传文件！";
}
else
{
string filepath = FileUpload1.PostedFile.FileName; //得到的是文件的完整路径,包括文件名，如：C:/Documents and Settings/Administrator/My Documents/My Pictures/20022775_m.jpg
//string filepath = FileUpload1.FileName; //得到上传的文件名20022775_m.jpg
string filename = filepath.Substring(filepath.LastIndexOf("//") + 1);//20022775_m.jpg
string serverpath = Server.MapPath("~/images/") + filename;//取得文件在服务器上保存的位置C:/Inetpub/wwwroot/WebSite1/images/20022775_m.jpg
FileUpload1.PostedFile.SaveAs(serverpath);//将上传的文件另存为
this.Upload_info.Text = "上传成功！";
}
}
catch (Exception ex)
{
this.Upload_info.Text = "上传发生错误！原因是：" + ex.ToString();
}
}
}

3 多文件上传

前台代码：

<body>
<form id="form1" runat="server">
<div>
<table style="width: 343px">
<tr>
<td style="width: 100px">
多文件上传</td>
<td style="width: 100px">
</td>
</tr>
<tr>
<td style="width: 100px">
<asp:FileUpload ID="FileUpload1" runat="server" Width="475px" />
</td>
<td style="width: 100px">
</td>
</tr>
<tr>
<td style="width: 100px">
<asp:FileUpload ID="FileUpload2" runat="server" Width="475px" /></td>
<td style="width: 100px">
</td>
</tr>
<tr>
<td style="width: 100px">
<asp:FileUpload ID="FileUpload3" runat="server" Width="475px" /></td>
<td style="width: 100px">
</td>
</tr>
<tr>
<td style="width: 100px">
<asp:Button ID="bt_upload" runat="server" OnClick="bt_upload_Click" Text="一起上传" />
<asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="448px"></asp:Label></td>
<td style="width: 100px">
</td>
</tr>
</table>
</div>
</form>
</body>

后台代码：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void bt_upload_Click(object sender, EventArgs e)
{
if (FileUpload1.PostedFile.FileName == "" && FileUpload2.PostedFile.FileName == "" && FileUpload3.PostedFile.FileName == "")
{
this.lb_info.Text = "请选择文件！";
}
else
{
HttpFileCollection myfiles = Request.Files;
for (int i = 0; i < myfiles.Count; i++)
{
HttpPostedFile mypost = myfiles[i];
try
{
if (mypost.ContentLength > 0)
{
string filepath = mypost.FileName;//C:/Documents and Settings/Administrator/My Documents/My Pictures/20022775_m.jpg
string filename = filepath.Substring(filepath.LastIndexOf("//") + 1);//20022775_m.jpg
string serverpath = Server.MapPath("~/images/") + filename;//C:/Inetpub/wwwroot/WebSite2/images/20022775_m.jpg
mypost.SaveAs(serverpath);
this.lb_info.Text = "上传成功！";
}
}
catch (Exception ex)
{
this.lb_info.Text = "上传发生错误！原因：" + ex.Message.ToString();
}
}
}
}
}