問題：現在asp.net request 表單域的預設長度是1000，如果是超過一千 就會出錯，或者request.form取不到1000以後的表單資料。
測試代碼：
<%@ Page Language="C#"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>無標題頁</title>
</head>
<body>
<form id="form1" runat="server">
<%
Response.Write(Request.Params.AllKeys.Length);
Response.Write("<br />");
for (int i = 0; i < 3000; i++)
{
Response.Write(string.Format("<input type='text' name='txt{0}' value='{0}'/>",i));
if (i% 5 == 0)
{
Response.Write("<br />");
}
}
%>
<input type="submit" value="提交" />
</form>
</body>
</html>
點提交會有如的錯誤（1、對象的目前狀態使該操作無效；2、URL編碼表單資料無效）：
解決辦法：
在Web.config的appSettings加入如下配置：
<appSettings>
<add key="aspnet:MaxHttpCollectionKeys" value="5000" />
</appSettings>
再次提交就不會出錯，而且能取得所有表單的資訊。
參考：
http://blogs.msdn.com/b/paulking/archive/2012/01/16/using-an-http-module-to-assist-in-adjusting-the-value-of-aspnet-maxhttpcollectionkeys-imposed-by-ms11-100.aspx
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