asp.net 2.0里当readonly遇上enableviewstate=false

偶然在一个老外的blog里看到有这样的描述，当textbox控件里被设置为readonly时，而且页面的enableviewsate设置为false时，提交后，textbox的值会丢失，这只发生在asp.net 2.0中，在asp.net 1.0/1.1中不会出现这样的情况，代码如下：<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" EnableViewState="false" Inherits="_Default" %>XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

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abel ID="lblMessage" runat="server" Text="Label">abel>在.net 2.0下运行，的确会丢失了文本框的值。最后，找到了MSDN的解析和微软的BUG反馈中心，其实这不是BUG，是.net 2.0下为了安全的一个小改变，具体摘录如下，大家就明白了：微软的反馈为：After careful analysis, the explanation for the observed behaviour is that:With a design change in ASP .NET based on user security concern, the input for a readonly textbox is saved in viewstate, which doesnt happen if viewstate is disabled. To workaround this, a page developer can add the readonly attribute to the TextBox.Attributes collection, which can then be used to access the 'value' of the textbox.We hope this clarifies. Thank you. Web Server & Tools MSDN 2005的解析：The Text value of a TextBox control with the ReadOnly property set to true is sent to the server when a postback occurs, but the server does no processing for a read-only text box. This prevents a malicious user from changing a Text value that is read-only. The value of the Text property is preserved in the view state between postbacks unless modified by server-side code.出处：jackyrong blog