100165425.htm
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">LinkDemand</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">要求当前调用者有特定的权限</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">PermitOnly</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">类似于</span><span lang="EN-US">Deny</span><span style="FONT-FAMILY: 宋体">，没有由</span><span lang="EN-US">PermitOnly</span><span style="FONT-FAMILY: 宋体">明确列出的、对资源的后续请求都被拒绝</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">RequestMinimum</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">应用于程序集，它包含程序集正确执行所需要的权限</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">RequestOptional</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">应用于程序集，它请求程序集可以授予的权限（如果有），以提供额外的特性和功能</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">RequestRefuse</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">应用于程序集，包含不希望程序集拥有的权限</span></p>
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<p class="MsoNormal"><span lang="EN-US" style="COLOR: black"> </span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">当考虑应用程序的权限需求时，通常必须选择下面两种情况中的一种：</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">在开始执行时请求需要的所有权限，如果没有赋予那些权限，则退出执行。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">在开始执行时不请求权限，但是执行过程中一直准备着处理安全异常。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">一旦使用权限属性以上述方式配置程序集之后，就可以对包含程序集清单的程序集文件使用</span><span lang="EN-US">permview.exe</span><span style="FONT-FAMILY: 宋体">实用程序查看权限：</span></p>
<p class="a6" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><strong><span lang="EN-US" style="COLOR: black">permview.exe <path>\SecurityApp2\bin\Debug\ SecurityApp2.dll</span></strong></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">对应用程序使用前面讨论的</span><span lang="EN-US">3</span><span style="FONT-FAMILY: 宋体">个属性，执行这个命令，可以得到如下结果：</span></p>
<p class="a6" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">Microsoft (R) .NET Framework Permission Request Viewer. Version 1.1.4322.573</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">minimal permission set:</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"><PermissionSet class="System.Security.PermissionSet"</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> version="1"></span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <IPermission class="System.Security.Permissions.UIPermission, mscorlib,</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Version=1.0.5000.0, Culture=neutral, </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> PublicKeyToken=b77a5c561934e089"</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> version="1"</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Unrestricted="true"/></span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"></PermissionSet></span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">optional permission set:</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"><PermissionSet class="System.Security.PermissionSet" version="1"></span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib,</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Version=1.0.5000.0, Culture=neutral, </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> PublicKeyToken=b77a5c561934e089"</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> version="1"</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Flags="UnmanagedCode"/></span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"></PermissionSet></span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">refused permission set:</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"><PermissionSet class="System.Security.PermissionSet"</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> version="1"></span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib,</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Version=1.0.5000.0, Culture=neutral, </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> PublicKeyToken=b77a5c561934e089"</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> version="1"</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> Read="c:\"/></span></p>
<p class="a6" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"></PermissionSet></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">除了可以请求权限之外，还可以请求权限集，请求权限集的优点是一次可以请求一个完整的权限集。由于</span><span lang="EN-US">Everything</span><span style="FONT-FAMILY: 宋体">权限集能够在程序集运行时通过安全性策略来改变，因此，不能请求这个权限集。例如，当程序集在运行期间请求权限时，就必须赋予它</span><span lang="EN-US">Everything</span><span style="FONT-FAMILY: 宋体">权限集中的所有权限，由于管理员可以在运行应用程序时修改这个权限集，因此程序集可以使用的权限有可能比策略中给出的还要多一些。</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-FAMILY: 宋体">下面的示例阐明了如何请求内置的权限集：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">[assembly:PermissionSetAttribute(SecurityAction.RequestMinimum, </span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"> Name = "FullTrust")]</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在这个示例中，程序集至少要请求内置权限集</span><span lang="EN-US">FullTrust</span><span style="FONT-FAMILY: 宋体">。如果程序集没有被赋予这个权限集，则运行期间会抛出安全异常。</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='100165425.htm'><font color='red'>14.2.2 请求权限</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165422.htm'>14.1.3 策略的级别：Machine、User和Enterprise</a></div><div style='float:right;width:49%'>·<a href='100165423.htm'>14.2 对Framework中安全性的支持</a></div><div style='float:left;width:49%'>·<a href='100165424.htm'>14.2.1 要求权限</a></div><div style='float:right;width:49%'>·<a href='100165426.htm'>14.2.3 隐式的权限</a></div><div style='float:left;width:49%'>·<a href='100165427.htm'>14.2.4 拒绝权限</a></div><div style='float:right;width:49%'>·<a href='100165428.htm'>14.2.5 断言权限</a></div></div>
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