Question

我有一箇中繼器象下面這樣：

    <asp:Repeater ID="Repeater1" runat="server"> 
         <ItemTemplate> 
          <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='<%# Eval("FilePath","~/HandlerForRepeater.ashx?path={0}") %>'><%# Eval("FileName")%></asp:HyperLink> 
          <br /> 
          <asp:Label ID="Label3" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "FileCreationDate", "{0:tt h:m:s - yyyy/MM/dd}") %>'></asp:Label> 
          <hr /> 
         </ItemTemplate> 
        </asp:Repeater> 

我有一個HandlerForRepeater.ashx爲另存爲對話框如下圖所示：

using System; 
    using System.Collections.Generic; 
    using System.Linq; 
    using System.Web; 

    namespace FileExplorer 
    { 
     /// <summary> 
     /// Summary description for HandlerForRepeater 
     /// </summary> 
     public class HandlerForRepeater : IHttpHandler, System.Web.SessionState.IRequiresSessionState 
     { 

      private HttpContext _context; 
      private HttpContext Context 
      { 
       get 
       { 
        return _context; 
       } 
       set 
       { 
        _context = value; 
       } 
      } 

      public void ProcessRequest(HttpContext context) 
      { 
       Context = context; 
       string filePath = context.Request.QueryString["path"]; 
       filePath = context.Server.MapPath(filePath); 

       if (filePath == null) 
       { 
        return; 
       } 

       System.IO.StreamReader streamReader = new System.IO.StreamReader(filePath); 
       System.IO.BinaryReader br = new System.IO.BinaryReader(streamReader.BaseStream); 

       byte[] bytes = new byte[streamReader.BaseStream.Length]; 

       br.Read(bytes, 0, (int)streamReader.BaseStream.Length); 

       if (bytes == null) 
       { 
        return; 
       } 

       streamReader.Close(); 
       br.Close(); 
       string fileName = System.IO.Path.GetFileName(filePath); 
       string MimeType = GetMimeType(fileName); 
       string extension = System.IO.Path.GetExtension(filePath); 
       char[] extension_ar = extension.ToCharArray(); 
       string extension_Without_dot = string.Empty; 
       for (int i = 1; i < extension_ar.Length; i++) 
       { 
        extension_Without_dot += extension_ar[i]; 
       } 

       //if (extension == ".jpg") 
       //{ // Handle *.jpg and 
       // WriteFile(bytes, fileName, "image/jpeg jpeg jpg jpe", context.Response); 
       //} 
       //else if (extension == ".gif") 
       //{// Handle *.gif 
       // WriteFile(bytes, fileName, "image/gif gif", context.Response); 
       //} 

       if (HttpContext.Current.Session["User_ID"] != null) 
       { 
        WriteFile(bytes, fileName, MimeType + " " + extension_Without_dot, context.Response); 
       } 
       else 
       { 
System.Web.UI.ScriptManager.RegisterStartupScript(this, this.GetType(), "MyMethod", "alert('You Can Not Download - pzl Login First');", true); 
       } 
      } 

      private void WriteFile(byte[] content, string fileName, string contentType, HttpResponse response) 
      { 
       response.Buffer = true; 
       response.Clear(); 
       response.ContentType = contentType; 

       response.AddHeader("content-disposition", "attachment; filename=" + fileName); 

       response.BinaryWrite(content); 
       response.Flush(); 
       response.End(); 
      } 

      private string GetMimeType(string fileName) 
      { 
       string mimeType = "application/unknown"; 
       string ext = System.IO.Path.GetExtension(fileName).ToLower(); 
       Microsoft.Win32.RegistryKey regKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext); 
       if (regKey != null && regKey.GetValue("Content Type") != null) 
        mimeType = regKey.GetValue("Content Type").ToString(); 

        return mimeType; 
       } 

       public bool IsReusable 
       { 
        get 
        { 
         return false; 
        } 
       } 
      } 
     } 

每一件事情是確定的這個處理程序，但我想說明的如果Session [「User_ID」]爲空，則向我的用戶發出警告！
所以我的問題是在下面一行：

System.Web.UI.ScriptManager.RegisterStartupScript(this, this.GetType(), "MyMethod", "MyMethod();", true); 

這行有錯誤在這個哈德勒！
我該如何在HandlerForRepeater.ashx中調用這些JavaScript方法？

在此先感謝

Answer 1

你應該做的是從頁的Repeater控件是不是處理程序。在後面的代碼的頁面轉發：

if(HttpContext.Current.Session["User_ID"] != null) 
{ 
    Response.Redirect("~/HandlerForRepeater.ashx?path={FilePath}"); 
} 
else 
{ 
    ClientScript.RegisterStartupScript(this.GetType(), "MyMethod", "MyMethod();", true); 
} 

你可以輸出從該頁面的文件，但儘量堅持當前的例子儘可能的。