防止重复提交代码,Asp.Net代码库,德仔网

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【Asp.Net】防止重复提交
作者:Dezai.CN / 发布于2011/3/15/ 1076
<div><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> RefreshServe : System.Web.UI.Page
 {
 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> ILog log </span><span style="color: #000000">=</span><span style="color: #000000"> LogManager.GetLogger(</span><span style="color: #0000ff">typeof</span><span style="color: #000000">(RefreshServe));

 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">readonly</span><span style="color: #000000"> </span><span style="color: #0000ff">string</span><span style="color: #000000"> REFRESH_TICKET_NAME </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">__RefreshTicketArray</span><span style="color: #800000">"</span><span style="color: #000000">;
 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">readonly</span><span style="color: #000000"> </span><span style="color: #0000ff">string</span><span style="color: #000000"> HIDDEN_FIELD_NAME </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">__RefreshHiddenField</span><span style="color: #800000">"</span><span style="color: #000000">;
 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">readonly</span><span style="color: #000000"> </span><span style="color: #0000ff">string</span><span style="color: #000000"> HIDDEN_PAGE_GUID </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">__RefreshPageGuid</span><span style="color: #800000">"</span><span style="color: #000000">;

 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> 为True表示页面刷新,False为正常提交
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #808080">
</span><span style="color: #000000"> </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">bool</span><span style="color: #000000"> IsPageRefreshed
 {
 </span><span style="color: #0000ff">get</span><span style="color: #000000">
 {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (IsPostBack </span><span style="color: #000000">&&</span><span style="color: #000000"> </span><span style="color: #000000">!</span><span style="color: #000000">CheckRefreshFlag())
 {
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">刷新了页面</span><span style="color: #800000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">true</span><span style="color: #000000">;
 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 {
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">正常提交</span><span style="color: #800000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 }
 }
 }

 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> 呈现前更新标识
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><param name="e"></param></span><span style="color: #808080">
</span><span style="color: #000000"> </span><span style="color: #0000ff">protected</span><span style="color: #000000"> </span><span style="color: #0000ff">override</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> OnPreRender(EventArgs e)
 {
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">执行OnPreRender</span><span style="color: #800000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">base</span><span style="color: #000000">.OnPreRender(e);
 UpdateRefreshFlag();
 }


 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> 更新标识,正常提交都删除该次提交的时间,并生产当前新的时间
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #808080">
</span><span style="color: #000000"> </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> UpdateRefreshFlag()
 {

 </span><span style="color: #0000ff">#region</span><span style="color: #000000"> Cookie模式</span><span style="color: #000000">

 </span><span style="color: #008000">//</span><span style="color: #008000">注册页面唯一标识并返回</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">string</span><span style="color: #000000"> pageGuid </span><span style="color: #000000">=</span><span style="color: #000000"> SetCurPageGuid();

 HttpCookie cookie </span><span style="color: #000000">=</span><span style="color: #000000"> GetRefreshTicket();
 
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (cookie.Values.Count </span><span style="color: #000000">></span><span style="color: #000000"> </span><span style="color: #800080">0</span><span style="color: #000000">)
 {
 cookie.Values.Remove(pageGuid);
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">当前清除的cookie变是:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> pageGuid);
 }

 </span><span style="color: #0000ff">string</span><span style="color: #000000"> submitTime </span><span style="color: #000000">=</span><span style="color: #000000"> DateTime.Now.ToString(</span><span style="color: #800000">"</span><span style="color: #800000">hhmmss.fffff</span><span style="color: #800000">"</span><span style="color: #000000">);
 </span><span style="color: #008000">//</span><span style="color: #008000">当前提交时间保存到隐藏域</span><span style="color: #008000">
</span><span style="color: #000000"> ClientScript.RegisterHiddenField(HIDDEN_FIELD_NAME, submitTime);


 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">即将要新增的时间:submitTime:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> submitTime </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000"> Guid:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> pageGuid.ToString());
 cookie.Values.Add(pageGuid, submitTime);

 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">UpdateRefreshFlag中当前Cookie中存在的记录数为:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> cookie.Values.Count);
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (</span><span style="color: #0000ff">int</span><span style="color: #000000"> i </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #800080">0</span><span style="color: #000000">; i </span><span style="color: #000000"><</span><span style="color: #000000"> cookie.Values.Count; i</span><span style="color: #000000">++</span><span style="color: #000000">)
 log.Info(</span><span style="color: #800000">"</span><span style="color: #800000">cookie[</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> cookie.Values.GetKey(i) </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">]:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> cookie.Values[i]);

 Response.AppendCookie(cookie);

 </span><span style="color: #0000ff">#endregion</span><span style="color: #000000">

 }


 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> 验证是否刷新
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><returns></returns></span><span style="color: #808080">
</span><span style="color: #000000"> </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">bool</span><span style="color: #000000"> CheckRefreshFlag()
 {
 HttpCookie cookie </span><span style="color: #000000">=</span><span style="color: #000000"> GetRefreshTicket();
 </span><span style="color: #0000ff">string</span><span style="color: #000000"> pageGuid </span><span style="color: #000000">=</span><span style="color: #000000"> GetCurPageGuid();
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (cookie.Values.Count </span><span style="color: #000000">></span><span style="color: #000000"> </span><span style="color: #800080">0</span><span style="color: #000000">)
 {
 </span><span style="color: #0000ff">bool</span><span style="color: #000000"> flag;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (cookie.Values[pageGuid] </span><span style="color: #000000">!=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">)
 flag </span><span style="color: #000000">=</span><span style="color: #000000"> cookie.Values[pageGuid].IndexOf(GetCurSubmitTime()) </span><span style="color: #000000">></span><span style="color: #000000"> </span><span style="color: #000000">-</span><span style="color: #800080">1</span><span style="color: #000000">;
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 flag </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">true</span><span style="color: #000000">;</span><span style="color: #008000">//</span><span style="color: #008000">防止出现异常,总是可以提交</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (flag)
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">提交时间存在,可以提交</span><span style="color: #800000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">无效的提交时间</span><span style="color: #800000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> flag;
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">true</span><span style="color: #000000">;
 }


 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> 得到已保存的提交时间,没有新建,有返回
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><returns></returns></span><span style="color: #808080">
</span><span style="color: #000000"> </span><span style="color: #0000ff">private</span><span style="color: #000000"> HttpCookie GetRefreshTicket()
 { 
 </span><span style="color: #0000ff">#region</span><span style="color: #000000"> Cookie模式,返回值为Cookie</span><span style="color: #000000">

 HttpCookie cookie;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (Request.Cookies[REFRESH_TICKET_NAME] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">)
 {
 cookie </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> HttpCookie(REFRESH_TICKET_NAME);
 Response.AppendCookie(cookie);
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">Cookie不存在，初始化</span><span style="color: #800000">"</span><span style="color: #000000">);
 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 {
 cookie </span><span style="color: #000000">=</span><span style="color: #000000"> Request.Cookies[REFRESH_TICKET_NAME];

 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">读取已存在的Cookie,当前Cookie中存在的记录数为:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> cookie.Values.Count </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">具体有如下几条:</span><span style="color: #800000">"</span><span style="color: #000000">);

 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (</span><span style="color: #0000ff">int</span><span style="color: #000000"> i </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #800080">0</span><span style="color: #000000">; i </span><span style="color: #000000"><</span><span style="color: #000000"> cookie.Values.Count; i</span><span style="color: #000000">++</span><span style="color: #000000">)
 log.Info(</span><span style="color: #800000">"</span><span style="color: #800000">cookie[</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> cookie.Values.GetKey(i) </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">]:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> cookie.Values[i]);
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> cookie;
 </span><span style="color: #0000ff">#endregion</span><span style="color: #000000">
 }


 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> 获取当前提交时间
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><returns></returns></span><span style="color: #808080">
</span><span style="color: #000000"> </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">string</span><span style="color: #000000"> GetCurSubmitTime()
 {
 </span><span style="color: #0000ff">string</span><span style="color: #000000"> submitTime </span><span style="color: #000000">=</span><span style="color: #000000"> Request.Params[HIDDEN_FIELD_NAME] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000"> </span><span style="color: #000000">?</span><span style="color: #000000"> </span><span style="color: #800000">""</span><span style="color: #000000"> : Request.Params[HIDDEN_FIELD_NAME].ToString();
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">执行GetCurSubmitTime:submitTime为:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> submitTime);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> submitTime;
 }


 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> 设置页面唯一标识,通过Guid标识来区分每个页面自己的提交时间
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #808080">
</span><span style="color: #000000"> </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">string</span><span style="color: #000000"> SetCurPageGuid()
 {
 </span><span style="color: #0000ff">string</span><span style="color: #000000"> guid;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (</span><span style="color: #000000">!</span><span style="color: #000000">IsPostBack)
 {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (Request.Params[HIDDEN_PAGE_GUID] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">)
 {
 guid </span><span style="color: #000000">=</span><span style="color: #000000"> System.Guid.NewGuid().ToString();
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">SetCurPageGuid注册了一个新的标识:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> guid);
 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 guid </span><span style="color: #000000">=</span><span style="color: #000000"> GetCurPageGuid();

 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 {
 guid </span><span style="color: #000000">=</span><span style="color: #000000"> GetCurPageGuid(); 
 }

 ClientScript.RegisterHiddenField(HIDDEN_PAGE_GUID, guid);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> guid;
 }



 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> 得到当前页面的唯一标识
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><returns></returns></span><span style="color: #808080">
</span><span style="color: #000000"> </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">string</span><span style="color: #000000"> GetCurPageGuid()
 {
 </span><span style="color: #0000ff">string</span><span style="color: #000000"> pageGuid </span><span style="color: #000000">=</span><span style="color: #000000"> Request.Params[HIDDEN_PAGE_GUID] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000"> </span><span style="color: #000000">?</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">none</span><span style="color: #800000">"</span><span style="color: #000000"> : Request.Params[HIDDEN_PAGE_GUID].ToString();
 log.Debug(</span><span style="color: #800000">"</span><span style="color: #800000">执行GetCurPageGuid()后Page_GUID为:</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> pageGuid);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> pageGuid;
 }

需要刷新判断功能时新页面只需继承该类就可,通过引用属性IsPageRefreshed识别</span><span style="color: #800000">"</span><span style="color: #800000">为真表示刷新,假则是正常提交</span><span style="color: #800000">"</span><span style="color: #000000">,将数据库的操作写在
</span><span style="color: #0000ff">if</span><span style="color: #000000">(</span><span style="color: #000000">!</span><span style="color: #000000">IsPageRefreshed)
{
 数据库操作
}
即可,如果是刷新不会执行,代码中注释部分使用的是Session方式保存票证,因为session比较容易丢失且占内存,所以使用cookie,
</span></div>
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