当表单发送的数据量很大时，就会报错。查阅MSDN了解到，原因是微软对用Request.Form()可接收的最大数据有限制，IIS4中为80K字节，IIS5中为100K字节。

　　下面是微软网站的解决的几个方法:

Request.Form collection, use Request.BinaryRead (Request.TotalBytes), and parse the form values from the output of Request.BinaryRead.
• Use a File Upload scheme, such as Microsoft Posting Acceptor.
• Break the HTML form variables into multiple form variables before you submit the form. The 102,399 byte limit is for each form variable, so you can have multiple form variables of 102,399 characters or less. The following sample code illustrates this: WARNING: ANY USE BY YOU OF THE CODE PROVIDED IN THIS ARTICLE IS AT YOUR OWN RISK. Microsoft provides this code "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

<FORM method=post action=LargePost.asp name=theForm
onsubmit="BreakItUp()">
<Textarea rows=3 cols=100 name=BigTextArea>A bunch of text...
</Textarea>
<input type=submit value=go>
</form>
<SCRIPT Language=JavaScript>
function BreakItUp()
{
  //Set the limit for field size.
  var FormLimit = 102399
  //Get the value of the large input object.
  //(如果有中文,则要把102399改小一些,例如:51100)
  var TempVar = new String
  TempVar = document.theForm.BigTextArea.value
  //If the length of the object is greater than the limit, break it
  //into multiple objects.
  if (TempVar.length > FormLimit)
  {
    document.theForm.BigTextArea.value = TempVar.substr(0, FormLimit)
    TempVar = TempVar.substr(FormLimit)
    while (TempVar.length > 0)
    {
      var objTEXTAREA = document.createElement("TEXTAREA")
      objTEXTAREA.name = "BigTextArea"
      objTEXTAREA.value = TempVar.substr(0, FormLimit)
      document.theForm.appendChild(objTEXTAREA)
      
      TempVar = TempVar.substr(FormLimit)
    }
  }
}
</SCRIPT>

　　The receiving Active Server Page (ASP) page reconstructs the variable:

<%
Dim BigTextArea
For I = 1 To Request.Form("BigTextArea").Count 
  BigTextArea = BigTextArea & Request.Form("BigTextArea")(I)
Next
%>

来自：http://support.microsoft.com/default.aspx?scid=kb;en-us;Q273482

出处：Microsoft
责任编辑：51windows

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