解决在地址栏给参数随便赋值造成页面报错的方法代码,Asp.Net代码库,德仔网

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【Asp.Net】解决在地址栏给参数随便赋值造成页面报错的方法
作者:Dezai.CN / 发布于2011/7/7/ 436
<div>
<div>在页面加载事件中写入</div>
<div></div>
if（！IsPostBack）</div>
<div>{</div>
<div>string caid=Request.QueryString["caid"] //获取页面传过来的值</div>
<div>int x; //定义一个整形变量</div>
if（string.IsNullOrEmpty(caid) || !int.TryPars（caid,out x））// // 如果 字符串为null并且为空 或者字符串不是整形数据 就跳转到首页</div>
<div>{</div>
<div>Response.Redirect("Default.aspx");</div>
<div>}
<div></div>
<div>}
<div>------------------------------------------------------------</div>
<div>------------------------------------------------------------</div>
<div><span style="background-color: yellow; color: red">asp.net判断字符串是否是数字int 型整型的</span></div>
<div></div>

<div></div>
<div><span class="comment"><font color="#008200">/// <summary> </font></span></div>
<div></div>
<div><span class="comment"><font color="#008200">/// 判断是否是数字 </font></span></div>
<div><span class="comment"><font color="#008200">/// </summary> </font></span></div>
<div><span class="comment"><font color="#008200">/// <param name="str">字符串</param> </font></span></div>
<div><span class="comment"><font color="#008200">/// <returns>bool</returns> </font></span></div>
<div><span class="keyword"><strong><font color="#7f0055">public</font></strong></span><span> </span><span class="keyword"><strong><font color="#7f0055">bool</font></strong></span><span> IsNumeric(</span><span class="keyword"><strong><font color="#7f0055">string</font></strong></span><span> str) </span></div>
<div><span>{ </span></div>
<div><span class="keyword"><strong><font color="#7f0055">if</font></strong></span><span> (str == </span><span class="keyword"><strong><font color="#7f0055">null</font></strong></span><span> || str.Length == 0) </span></div>
<div><span class="keyword"><strong><font color="#7f0055">return</font></strong></span><span> </span><span class="keyword"><strong><font color="#7f0055">false</font></strong></span><span>; </span></div>
<div><span>System.Text.ASCIIEncoding ascii = </span><span class="keyword"><strong><font color="#7f0055">new</font></strong></span><span> System.Text.ASCIIEncoding(); </span></div>
<div><span class="keyword"><strong><font color="#7f0055">byte</font></strong></span><span>[] bytestr = ascii.GetBytes(str); </span></div>
<div><span class="keyword"><strong><font color="#7f0055">foreach</font></strong></span><span> (</span><span class="keyword"><strong><font color="#7f0055">byte</font></strong></span><span> c </span><span class="keyword"><strong><font color="#7f0055">in</font></strong></span><span> bytestr) </span></div>
<div><span>{ </span></div>
<div><span class="keyword"><strong><font color="#7f0055">if</font></strong></span><span> (c < 48 || c > 57) </span></div>
<div><span>{ </span></div>
<div><span class="keyword"><strong><font color="#7f0055">return</font></strong></span><span> </span><span class="keyword"><strong><font color="#7f0055">false</font></strong></span><span>; </span></div>
<div><span>} </span></div>
<div><span>} </span></div>
<div><span class="keyword"><strong><font color="#7f0055">return</font></strong></span><span> </span><span class="keyword"><strong><font color="#7f0055">true</font></strong></span><span>; </span></div>
<div><span>} </span></div>
<div></div>
</div>
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