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14.3.4 声明基于角色的安全性
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14.3.4 声明基于角色的安全性
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<h1 id="divCurrentNode" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165435.htm'><font color='red'>14.3.4 声明基于角色的安全性</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165432.htm'>14.3.1 Principal</a></div><div style='float:right;width:49%'>·<a href='100165433.htm'>14.3.2 Windows Principal</a></div><div style='float:left;width:49%'>·<a href='100165434.htm'>14.3.3 角色</a></div><div style='float:right;width:49%'>·<a href='100165436.htm'>14.4 安全策略的管理</a></div><div style='float:left;width:49%'>·<a href='100165437.htm'>14.4.1 安全配置文件</a></div><div style='float:right;width:49%'>·<a href='100165438.htm'>14.4.2 代码组和权限的管理</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><a ftel="_Toc507815615"><span lang="EN-US">14.3.4 </span></a><span style="FONT-FAMILY: 黑体">声明基于角色的安全</span><span style="FONT-FAMILY: 黑体">性</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">如同代码访问的安全性一样，可以使用命令式的请求</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">如前面一小节所述</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">或使用属性执行基于角色的安全性请求</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">用户必须是</span><span lang="EN-US">Administrator</span><span style="FONT-FAMILY: 宋体">组中的成员</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">。在类的级别上，可以声明规定权限的需求，其代码如下所示：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><a ftel="OLE_LINK1"><span lang="EN-US">using System;</span></a></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">using System.Security;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">using System.Security.Principal;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">using System.Security.Permissions;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">namespace Wrox.ProCSharp.Security</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> class SecurityApp8</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> static void Main(string[] args)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> AppDomain.CurrentDomain.SetPrincipalPolicy(</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> PrincipalPolicy.WindowsPrincipal);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> try</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> ShowMessage();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> catch (SecurityException exception)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine("Security exception caught (" + </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> exception.Message + ")");</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine("The current principal must be in the local"</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> + "Users group");</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> [PrincipalPermissionAttribute(SecurityAction.Demand, </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Role = "BUILTIN\\Users")]</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> static void ShowMessage()</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine("The current principal is logged in locally ");</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Console.WriteLine("(they are a member of the local Users group)");</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">}</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">除非在</span><span lang="EN-US">Windows</span><span style="FONT-FAMILY: 宋体">本地</span><span lang="EN-US">Users</span><span style="FONT-FAMILY: 宋体">组的用户环境中执行应用程序，否则</span><span lang="EN-US">ShouMessage()</span><span style="FONT-FAMILY: 宋体">方法将产生一个异常。对于</span><span lang="EN-US">Web</span><span style="FONT-FAMILY: 宋体">应用程序而言，运行</span><span lang="EN-US">ASP.NET</span><span style="FONT-FAMILY: 宋体">代码的账户必须处于组中，但在实际应用中一定不会把这个账户添加到管理员组中。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">如果使用本地</span><span lang="EN-US">User</span><span style="FONT-FAMILY: 宋体">组中的账户运行上面的代码，则输出结果如下所示：</span></p>
<p class="a6" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US" style="COLOR: black">The current principal is logged in locally</span></p>
<p class="a6" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US" style="COLOR: black">(they are a member of the local Users group)</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">关于</span><span lang="EN-US">.NET</span><span style="FONT-FAMILY: 宋体">基于角色的安全的详细信息，请参阅</span><span lang="EN-US">System.Security.Principal</span><span style="FONT-FAMILY: 宋体">命名空间的</span><span lang="EN-US">MSDN</span><span style="FONT-FAMILY: 宋体">文档说明。</span></p></div>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165435.htm'><font color='red'>14.3.4 声明基于角色的安全性</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165432.htm'>14.3.1 Principal</a></div><div style='float:right;width:49%'>·<a href='100165433.htm'>14.3.2 Windows Principal</a></div><div style='float:left;width:49%'>·<a href='100165434.htm'>14.3.3 角色</a></div><div style='float:right;width:49%'>·<a href='100165436.htm'>14.4 安全策略的管理</a></div><div style='float:left;width:49%'>·<a href='100165437.htm'>14.4.1 安全配置文件</a></div><div style='float:right;width:49%'>·<a href='100165438.htm'>14.4.2 代码组和权限的管理</a></div></div>
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