有哪位高手知道ASP.NET中用C#怎样怎样实现文件上传

Posted 2023-04-16

有哪位高手知道ASP.NET中用C#怎样怎样实现文件上传，急。。。。。。。。。。

说明：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
后台代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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)

try

if (FileUpload1.PostedFile.FileName == "")

this.lb_info.Text = "请选择文件！";

else

string filepath = FileUpload1.PostedFile.FileName;
string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);
string serverpath = Server.MapPath("images/") + filename;
FileUpload1.PostedFile.SaveAs(serverpath);
this.lb_info.Text = "上传成功！";


catch (Exception ex)

this.lb_info.Text = "上传发生错误！原因是：" + ex.ToString();




前台代码：
<form id="Form1" method="post" encType="multipart/form-data" runat="server">
<table style="width: 343px">
<tr>
<td style="width: 100px">
单文件上传</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">
<asp:Button ID="bt_upload" runat="server" OnClick="bt_upload_Click" Text="上传" /></td>
</tr>
<tr>
<td style="width: 100px; height: 21px;">
<asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="183px"></asp:Label></td>
<td style="width: 100px; height: 21px">
</td>
</tr>
</table>
</form> 参考技术A 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;

/// <summary>
/// MyUpload 的摘要说明
/// </summary>
public class MyUpload

private System.Web.HttpPostedFile postedFile = null;
private string savePath = "";
private string[] extension;
private int fileLength = 0;
public string[] filestype = "txt", "doc", "gif" ;
public MyUpload()

//
// TODO: 在此处添加构造函数逻辑
//

public string Help

get

string helpstring;
helpstring = "<font size=3>MyUpload myUpload=new MyUpload(); //构造函数";
helpstring += "myUpload.PostedFile=file1.PostedFile;//设置要上传的文件";
helpstring += "myUpload.SavePath=\"e:\\\";//设置要上传到服务器的路径，默认c:\\";
helpstring += "myUpload.FileLength=100; //设置上传文件的最大长度，单位k，默认1k";
helpstring += "myUpload.Extension=\"doc\";设置上传文件的扩展名，默认txt";
helpstring += "label1.Text=myUpload.Upload();//开始上传，并显示上传结果";
helpstring += "<font size=3 color=red>";
return helpstring;




public System.Web.HttpPostedFile PostedFile

get

return postedFile;

set

postedFile = value;



public string SavePath

get

if (savePath != "") return savePath;
return "c:\\";

set

savePath = HttpContext.Current.Server.MapPath("../upimages/") + value;/////////////////////注意这里选取上传文件路径,可以修改成传递参数类型的



public int FileLength

get

if (fileLength != 0) return fileLength;
return 1024;

set

fileLength = value * 1024;



public string[] Extension

get

if (extension != null) return extension;
return filestype;

set

extension = value;



public string PathToName(string path)

int pos = path.LastIndexOf("\\");
return path.Substring(pos + 1);


public string Upload()

int biaoshi = 0;
if (PostedFile.FileName != "")

try

string fileName = PathToName(PostedFile.FileName);
for (int i = 0; i < Extension.Length; i++)

if (fileName.EndsWith(Extension[i]))

biaoshi = 1;


if (biaoshi != 1)

string errs = "";
for (int i = 0; i < Extension.Length; i++)

errs = errs + Extension[i] + "/";

return "您必须选择" + errs + "类型的文件!";

if (PostedFile.ContentLength > FileLength) return "文件太大，超过了限定值!";
PostedFile.SaveAs(SavePath + DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + fileName.Substring(fileName.Length - 4, 4));
return DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + fileName.Substring(fileName.Length - 4, 4);

catch (System.Exception exc) return exc.Message;

return "请选择文件后再进行上传!";



////////////////////使用例子,直接复制没有修改/////////////////////
string[] filestype = "gif", "jpg", "png" ;
MyUpload myload = new MyUpload();
myload.PostedFile = File1.PostedFile;
myload.SavePath = "";
myload.FileLength = 1000;
myload.Extension = filestype;
Label1.Text = myload.Upload();
if (Label1.Text.StartsWith("200"))

Label2.Text = "upimages/" + Label1.Text;

Label1.Text = "上传更新成功!";

ASP.NET里在WEB页里怎样做滚动字幕？

我知道有个东西叫marquee。但那在HTML可以这样写，在ASP里就根本打不出这个代码
不要总是说你用HTML写啊，怎么的怎么的，用HTML写我也会。
我现在就是要用ASP里的WEB状态页下写

参考技术A 在线帮你解决问题，加QQ:282735353, 注明:百度知道.