1 使用标准HTML来进行图片上传
前台代码：
<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=" 400px">
<input id="InputFile" style=" 399px" type="file" runat="server" /></td>
<td style=" 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：
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 UploadButton_Click(object sender, EventArgs e)
{
string uploadName = InputFile.Value;//获取待上传图片的完整路径，包含文件名称
//string uploadName = InputFile.PostedFile.FileName;
string pictureName = "";//上传后的图片名，以当前时间为文件名称，确保文件名称没有反复
if (InputFile.Value != "")
{
int idx = uploadName.LastIndexOf(".");
string suffix = uploadName.Substring(idx);//获得上传的图片的后缀名
pictureName = DateTime.Now.Ticks.ToString() + suffix;
}
try
{
if (uploadName != "")
{
string path = Server.MapPath("~/images/");
InputFile.PostedFile.SaveAs(path + pictureName);
}
}
catch (Exception ex)
{
Response.Write(ex);
}
}
}
2 单文件上传
这是最主要的文件上传，在asp.net1.x中没有这个FileUpload控件，唯独html的上传控件，那时候要把html控件转化为server控件，非常不好用。事实上全部文件上传的漂亮效果都是从这个FileUpload控件衍生，第一个样例尽管简单却是根本。
前台代码：
<form id="form1" runat="server">
<div>
<table style=" 90%">
<tr>
<td style=" 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=" 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.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,包含文件名称，如：C:\Documents and Settings\Administrator\My Documents\My Pictures\20022775_m.jpg
//string filepath = FileUpload1.FileName; //得到上传的文件名称20022775_m.jpg
string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);//20022775_m.jpg
string serverpath = Server.MapPath("~/images/") + filename;//取得文件在server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();
}
}
}