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asp.net文件上传解决方案（图片上传、单文件上传、多文件上传、检查文件类型）

时间：2021-07-01 10:21:17 帮助过：11人阅读

小编之前也介绍了许多ASP.NET文件上传的解决案例，今天来个asp.net文件上传大集合。

1 使用标准HTML来进行图片上传
前台代码：

  1. <body> 
  2.  <form id="form1" runat="server"> 
  3.  <div> 
  4.   <table> 
  5.    <tr> 
  6.     <td colspan="2" style="height: 21px" > 
  7.      使用标准HTML来进行图片上传</td> 
  8.    </tr> 
  9.    <tr> 
  10.     <td style="width: 400px"> 
  11.      <input id="InputFile" style="width: 399px" type="file" runat="server" /></td> 
  12.     <td style="width: 80px"> 
  13.      <asp:Button ID="UploadButton" runat="server" Text="上传图片" OnClick="UploadButton_Click" /></td> 
  14.    </tr> 
  15.    <tr> 
  16.     <td colspan="2" > 
  17.      <asp:Label ID="Lb_Info" runat="server" ForeColor="Red"></asp:Label></td>     
  18.    </tr> 
  19.   </table>  
  20.  </div> 
  21.  </form> 
  22. </body>


后台代码：

  1. using System; 
  2. using System.Data; 
  3. using System.Configuration; 
  4. using System.Web; 
  5. using System.Web.Security; 
  6. using System.Web.UI; 
  7. using System.Web.UI.WebControls; 
  8. using System.Web.UI.WebControls.WebParts; 
  9. using System.Web.UI.HtmlControls; 
  10. public partial class _Default : System.Web.UI.Page 
  11. { 
  12.  protected void Page_Load(object sender, EventArgs e) 
  13.  { 
  14.  } 
  15.  protected void UploadButton_Click(object sender, EventArgs e) 
  16.  { 
  17.   string uploadName = InputFile.Value;//获取待上传图片的完整路径，包括文件名 
  18.   //string uploadName = InputFile.PostedFile.FileName; 
  19.   string pictureName = "";//上传后的图片名，以当前时间为文件名，确保文件名没有重复 
  20.   if (InputFile.Value != "") 
  21.   { 
  22.    int idx = uploadName.LastIndexOf("."); 
  23.    string suffix = uploadName.Substring(idx);//获得上传的图片的后缀名 
  24.    pictureName = DateTime.Now.Ticks.ToString() + suffix; 
  25.   } 
  26.   try 
  27.   { 
  28.    if (uploadName != "") 
  29.    { 
  30.     string path = Server.MapPath("~/images/"); 
  31.     InputFile.PostedFile.SaveAs(path + pictureName); 
  32.    } 
  33.   } 
  34.   catch (Exception ex) 
  35.   { 
  36.    Response.Write(ex); 
  37.   } 
  38.  } 
  39. }

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： 

  1. <body> 
  2.  <form id="form1" runat="server"> 
  3.  <div> 
  4.   <table style="width: 90%"> 
  5.    <tr> 
  6.     <td style="width: 159px" colspan=2> 
  7.      <strong><span style="font-size: 10pt">最简单的单文件上传</span></strong></td> 
  8.    </tr> 
  9.    <tr> 
  10.     <td style="width: 600px"> 
  11.      <asp:FileUpload ID="FileUpload1" runat="server" Width="600px" /></td> 
  12.     <td align=left> 
  13.      <asp:Button ID="FileUpload_Button" runat="server" Text="上传图片" OnClick="FileUpload_Button_Click" /></td> 
  14.    </tr> 
  15.    <tr> 
  16.     <td colspan=2> 
  17.      <asp:Label ID="Upload_info" runat="server" ForeColor="Red" Width="767px"></asp:Label></td> 
  18.    </tr> 
  19.   </table>  
  20.  </div> 
  21.  </form> 
  22. </body>

后台代码： 

  1. using System; 
  2. using System.Data; 
  3. using System.Configuration; 
  4. using System.Web; 
  5. using System.Web.Security; 
  6. using System.Web.UI; 
  7. using System.Web.UI.WebControls; 
  8. using System.Web.UI.WebControls.WebParts; 
  9. using System.Web.UI.HtmlControls; 
  10. public partial class _Default : System.Web.UI.Page 
  11. { 
  12.  protected void Page_Load(object sender, EventArgs e) 
  13.  { 
  14.  } 
  15.  protected void FileUpload_Button_Click(object sender, EventArgs e) 
  16.  { 
  17.   try 
  18.   { 
  19.    if (FileUpload1.PostedFile.FileName == "") 
  20.    //if (FileUpload1.FileName == "") 
  21.    //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。 
  22.    { 
  23.     this.Upload_info.Text = "请选择上传文件！"; 
  24.    } 
  25.    else 
  26.    { 
  27.     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 
  28.     //string filepath = FileUpload1.FileName;    //得到上传的文件名20022775_m.jpg 
  29.     string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);//20022775_m.jpg 
  30.     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 
  31.     FileUpload1.PostedFile.SaveAs(serverpath);//将上传的文件另存为 
  32.     this.Upload_info.Text = "上传成功！"; 
  33.    } 
  34.   } 
  35.   catch (Exception ex) 
  36.   { 
  37.    this.Upload_info.Text = "上传发生错误！原因是：" + ex.ToString(); 
  38.   } 
  39.  } 
  40. }


3、多文件上传
前台代码：

  1. <body> 
  2.  <form id="form1" runat="server"> 
  3.  <div> 
  4.  <table style="width: 343px"> 
  5.    <tr> 
  6.     <td style="width: 100px"> 
  7.      多文件上传</td> 
  8.     <td style="width: 100px"> 
  9.     </td> 
  10.    </tr> 
  11.    <tr> 
  12.     <td style="width: 100px"> 
  13.      <asp:FileUpload ID="FileUpload1" runat="server" Width="475px" /> 
  14.      </td> 
  15.     <td style="width: 100px"> 
  16.      </td> 
  17.    </tr> 
  18.    <tr> 
  19.     <td style="width: 100px"> 
  20.      <asp:FileUpload ID="FileUpload2" runat="server" Width="475px" /></td> 
  21.     <td style="width: 100px"> 
  22.     </td> 
  23.    </tr> 
  24.    <tr> 
  25.     <td style="width: 100px"> 
  26.      <asp:FileUpload ID="FileUpload3" runat="server" Width="475px" /></td> 
  27.     <td style="width: 100px"> 
  28.     </td> 
  29.    </tr> 
  30.    <tr> 
  31.     <td style="width: 100px"> 
  32.      <asp:Button ID="bt_upload" runat="server" OnClick="bt_upload_Click" Text="一起上传" /> 
  33.      <asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="448px"></asp:Label></td> 
  34.     <td style="width: 100px"> 
  35.     </td> 
  36.    </tr> 
  37.   </table> 
  38.  </div> 
  39.  </form> 
  40. </body>


后台代码： 

  1. using System; 
  2. using System.Data; 
  3. using System.Configuration; 
  4. using System.Web; 
  5. using System.Web.Security; 
  6. using System.Web.UI; 
  7. using System.Web.UI.WebControls; 
  8. using System.Web.UI.WebControls.WebParts; 
  9. using System.Web.UI.HtmlControls; 
  10. public partial class _Default : System.Web.UI.Page 
  11. { 
  12.  protected void Page_Load(object sender, EventArgs e) 
  13.  { 
  14.  } 
  15.  protected void bt_upload_Click(object sender, EventArgs e) 
  16.  { 
  17.   if (FileUpload1.PostedFile.FileName == "" && FileUpload2.PostedFile.FileName == "" && FileUpload3.PostedFile.FileName == "") 
  18.   { 
  19.    this.lb_info.Text = "请选择文件！"; 
  20.   } 
  21.   else 
  22.   { 
  23.    HttpFileCollection myfiles = Request.Files; 
  24.    for (int i = 0; i < myfiles.Count; i++) 
  25.    { 
  26.     HttpPostedFile mypost = myfiles[i]; 
  27.     try 
  28.     { 
  29.      if (mypost.ContentLength > 0) 
  30.      { 
  31.       string filepath = mypost.FileName;//C:\Documents and Settings\Administrator\My Documents\My Pictures\20022775_m.jpg 
  32.       string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);//20022775_m.jpg 
  33.       string serverpath = Server.MapPath("~/images/") + filename;//C:\Inetpub\wwwroot\WebSite2\images\20022775_m.jpg 
  34.       mypost.SaveAs(serverpath); 
  35.       this.lb_info.Text = "上传成功！"; 
  36.      } 
  37.     } 
  38.     catch (Exception ex) 
  39.     { 
  40.      this.lb_info.Text = "上传发生错误！原因：" + ex.Message.ToString(); 
  41.     } 
  42.    } 
  43.   } 
  44.  } 
  45. }

4、客户端检查上传文件类型(以上传图片为例)

  1. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> 
  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
  3. <html xmlns="http://www.w3.org/1999/xhtml" > 
  4. <head runat="server"> 
  5.  <title>客户端检查上传文件类型</title> 
  6.  <script language="javascript"> 
  7.  function Check_FileType() 
  8.  { 
  9.   var str=document.getElementById("FileUpload1").value; 
  10.   var pos=str.lastIndexOf("."); 
  11.   var lastname=str.substring(pos,str.length); 
  12.   if(lastname.toLowerCase()!=".jpg"&&lastname.toLowerCase()!=".gif") 
  13.   { 
  14.    alert("您上传的文件类型为"+lastname+"，图片必须为.jpg,.gif类型"); 
  15.    return false; 
  16.   } 
  17.   else 
  18.   { 
  19.    return true; 
  20.   }   
  21.  } 
  22.  </script> 
  23. </head> 
  24. <body> 
  25.  <form id="form1" runat="server"> 
  26.  <div> 
  27.   <table> 
  28.    <tr> 
  29.     <td colspan="2"> 
  30.      客户端检查上传文件类型</td>     
  31.    </tr> 
  32.    <tr> 
  33.     <td style="width: 444px"> 
  34.      <asp:FileUpload ID="FileUpload1" runat="server" Width="432px" /></td> 
  35.     <td style="width: 80px"> 
  36.      <asp:Button ID="bt_upload" runat="server" Text="上传图片" OnClick="bt_upload_Click" OnClientClick="return Check_FileType()" /></td> 
  37.    </tr> 
  38.    <tr> 
  39.     <td colspan="2" style="height: 21px"> 
  40.      <asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="515px"></asp:Label></td>     
  41.    </tr> 
  42.   </table>  
  43.  </div> 
  44.  </form> 
  45. </body> 
  46. </html>

注意：点击上传时先触发客户端事件OnClientClick="return Check_FileType()"

  1. using System; 
  2. using System.Data; 
  3. using System.Configuration; 
  4. using System.Web; 
  5. using System.Web.Security; 
  6. using System.Web.UI; 
  7. using System.Web.UI.WebControls; 
  8. using System.Web.UI.WebControls.WebParts; 
  9. using System.Web.UI.HtmlControls; 
  10. public partial class _Default : System.Web.UI.Page 
  11. { 
  12.  protected void Page_Load(object sender, EventArgs e) 
  13.  { 
  14.  } 
  15.  protected void bt_upload_Click(object sender, EventArgs e) 
  16.  { 
  17.   try 
  18.   { 
  19.    if (FileUpload1.PostedFile.FileName == "") 
  20.    { 
  21.     this.lb_info.Text = "请选择文件！"; 
  22.    } 
  23.    else 
  24.    { 
  25.     string filepath = FileUpload1.PostedFile.FileName; 
  26.     //if (!IsAllowedExtension(FileUpload1)) 
  27.     //{ 
  28.     // this.lb_info.Text = "上传文件格式不正确！"; 
  29.     //} 
  30.     if (IsAllowedExtension(FileUpload1) == true) 
  31.     { 
  32.      string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1); 
  33.      string serverpath = Server.MapPath("~/images/") + filename; 
  34.      FileUpload1.PostedFile.SaveAs(serverpath); 
  35.      this.lb_info.Text = "上传成功！"; 
  36.     } 
  37.     else 
  38.     { 
  39.      this.lb_info.Text = "请上传图片！"; 
  40.     } 
  41.    } 
  42.   } 
  43.   catch (Exception ex) 
  44.   { 
  45.    this.lb_info.Text = "上传发生错误！原因：" + ex.ToString(); 
  46.   } 
  47.  } 
  48.  private static bool IsAllowedExtension(FileUpload upfile) 
  49.  { 
  50.   string strOldFilePath = ""; 
  51.   string strExtension=""; 
  52.   string[] arrExtension ={ ".gif", ".jpg", ".bmp", ".png" }; 
  53.   if (upfile.PostedFile.FileName != string.Empty) 
  54.   { 
  55.    strOldFilePath = upfile.PostedFile.FileName;//获得文件的完整路径名 
  56.    strExtension = strOldFilePath.Substring(strOldFilePath.LastIndexOf("."));//获得文件的扩展名，如：.jpg 
  57.    for (int i = 0; i < arrExtension.Length; i++) 
  58.    { 
  59.     if (strExtension.Equals(arrExtension[i])) 
  60.     { 
  61.      return true; 
  62.     } 
  63.    } 
  64.   } 
  65.   return false; 
  66.  } 
  67. }

注意：若去掉客户端的脚本和客户端事件OnClientClick="return Check_FileType()"，在后台代码
改为：

  1. if (!IsAllowedExtension(FileUpload1)) 
  2.     { 
  3.      this.lb_info.Text = "上传文件格式不正确！"; 
  4.     }


else if (IsAllowedExtension(FileUpload1) == true)
即变成服务器端检查上传文件类型。
5、服务器端检查上传文件的类型（文件内部真正的格式）

  1. <body> 
  2.  <form id="form1" runat="server"> 
  3.  <div> 
  4.   <table> 
  5.    <tr> 
  6.     <td colspan="2"> 
  7.      服务器检查上传文件类型</td>     
  8.    </tr> 
  9.    <tr> 
  10.     <td style="width: 444px"> 
  11.      <asp:FileUpload ID="FileUpload1" runat="server" Width="432px" /></td> 
  12.     <td style="width: 80px"> 
  13.      <asp:Button ID="bt_upload" runat="server" Text="上传图片" OnClick="bt_upload_Click" /></td> 
  14.    </tr> 
  15.    <tr> 
  16.     <td colspan="2" style="height: 21px"> 
  17.      <asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="515px"></asp:Label></td>     
  18.    </tr> 
  19.   </table>  
  20.  </div> 
  21.  </form> 
  22. </body>

后台代码： 

  1. using System; 
  2. using System.Data; 
  3. using System.Configuration; 
  4. using System.Web; 
  5. using System.Web.Security; 
  6. using System.Web.UI; 
  7. using System.Web.UI.WebControls; 
  8. using System.Web.UI.WebControls.WebParts; 
  9. using System.Web.UI.HtmlControls; 
  10. using System.IO; 
  11. public partial class _Default : System.Web.UI.Page 
  12. { 
  13.  protected void Page_Load(object sender, EventArgs e) 
  14.  { 
  15.  } 
  16.  protected void bt_upload_Click(object sender, EventArgs e) 
  17.  { 
  18.   try 
  19.   { 
  20.    if (FileUpload1.PostedFile.FileName == "") 
  21.    { 
  22.     this.lb_info.Text = "请选择文件！"; 
  23.    } 
  24.    else 
  25.    { 
  26.     string filepath = FileUpload1.PostedFile.FileName; 
  27.     if (IsAllowedExtension(FileUpload1) == true) 
  28.     { 
  29.      string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1); 
  30.      string serverpath = Server.MapPath("images/") + filename; 
  31.      FileUpload1.PostedFile.SaveAs(serverpath); 
  32.      this.lb_info.Text = "上传成功！"; 
  33.     } 
  34.     else 
  35.     { 
  36.      this.lb_info.Text = "请上传图片"; 
  37.     } 
  38.    } 
  39.   } 
  40.   catch (Exception error) 
  41.   { 
  42.    this.lb_info.Text = "上传发生错误！原因：" + error.ToString(); 
  43.   } 
  44.  } 
  45.  private static bool IsAllowedExtension(FileUpload upfile) 
  46.  { 
  47.   FileStream fs = new FileStream(upfile.PostedFile.FileName, FileMode.Open, FileAccess.Read); 
  48.   BinaryReader r = new BinaryReader(fs); 
  49.   string fileclass = ""; 
  50.   byte buffer; 
  51.   try 
  52.   { 
  53.    buffer = r.ReadByte(); 
  54.    fileclass = buffer.ToString(); 
  55.    buffer = r.ReadByte(); 
  56.    fileclass += buffer.ToString(); 
  57.   } 
  58.   catch 
  59.   { 
  60.     
  61.   } 
  62.   r.Close(); 
  63.   fs.Close(); 
  64.   if (fileclass == "255216" || fileclass == "7173"||fileclass=="6677"||fileclass=="13780")//说明255216是jpg;7173是gif;6677是BMP,13780是PNG;7790是exe,8297是rar 
  65.   { 
  66.    return true; 
  67.   } 
  68.   else 
  69.   { 
  70.    return false; 
  71.   } 
  72.  } 
  73. }

为大家推荐一个专题，供大家学习：《ASP.NET文件上传汇总》

是不是内容很精彩，喜欢的朋友就收藏起来吧，以后在遇到ASP.NET文件上传问题的时候能够有所帮助。

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