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来自「C#高级编程(第三版),顶死你们。。 。up」· HTM 代码 · 共 127 行 · 第 1/2 页
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<p class="2" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> AppDomain.CurrentDomain.FriendlyName);</span></p>
<p class="2" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> }</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> [STAThread]</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> static void Main(string[] args)</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> {</span></p>
<p class="2" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> Console.WriteLine("Main in domain {0} called",</span></p>
<p class="2" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> AppDomain.CurrentDomain.FriendlyName);</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> }</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> }</span></p>
<p class="a6" style="FTEL: 8.15pt"><span lang="EN-US">}</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">创建的第二个项目也是一个</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">控制台应用程序：</span><span lang="EN-US">DomainTest</span><span style="FONT-FAMILY: 宋体">。首先，使用</span><span lang="EN-US">AppDomain</span><span style="FONT-FAMILY: 宋体">类的</span><span lang="EN-US">FriendlyName</span><span style="FONT-FAMILY: 宋体">属性显示当前域的名称。调用</span><span lang="EN-US">CreateDomain()</span><span style="FONT-FAMILY: 宋体">方法，创建一个新的应用程序域“</span><span lang="EN-US">New AppDomain</span><span style="FONT-FAMILY: 宋体">”，然后把程序集</span><span lang="EN-US">AssemblyA</span><span style="FONT-FAMILY: 宋体">加载到新域中，通过调用</span><span lang="EN-US">ExecuteAssembly()</span><span style="FONT-FAMILY: 宋体">来调用</span><span lang="EN-US">Main()</span><span style="FONT-FAMILY: 宋体">方法：</span></p>
<p class="a6" style="MARGIN-TOP: 8.15pt"><span lang="EN-US">using System;</span></p>
<p class="a6" style="BACKGROUND: #f2f2f2; LINE-HEIGHT: 13pt"><span lang="EN-US">namespace Wrox.ProCSharp.Assemblies.AppDomains</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US">{</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> class Test</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> {</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> [STAThread]</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> static void Main(string[] args)</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> {</span></p>
<p class="2" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> AppDomain currentDomain = AppDomain.CurrentDomain;</span></p>
<p class="2" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> Console.WriteLine(currentDomain.FriendlyName);</span></p>
<p class="2" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> AppDomain secondDomain = AppDomain.CreateDomain("New AppDomain");</span></p>
<p class="2" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> secondDomain.ExecuteAssembly("AssemblyA.exe");</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> }</span></p>
<p class="a6" style="LINE-HEIGHT: 13pt"><span lang="EN-US"> }</span></p>
<p class="a6" style="FTEL: 8.15pt"><span lang="EN-US">}</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17.6pt"><span style="FONT-FAMILY: 宋体">在启动程序</span><span lang="EN-US">DomainTest.exe</span><span style="FONT-FAMILY: 宋体">前，必须把程序集</span><span lang="EN-US">AssemblyA.exe</span><span style="FONT-FAMILY: 宋体">复制到</span><span lang="EN-US">DomainTest.exe</span><span style="FONT-FAMILY: 宋体">所在的目录下，这样程序才能找到这个程序集。不能添加</span><span lang="EN-US">AssemblyA.exe</span><span style="FONT-FAMILY: 宋体">程序集的引用，因为在</span><span lang="EN-US">Visual Studio .NET</span><span style="FONT-FAMILY: 宋体">中，只能给以</span><span lang="EN-US">DLL</span><span style="FONT-FAMILY: 宋体">格式存储的程序集添加引用，不支持</span><span lang="EN-US">EXE</span><span style="FONT-FAMILY: 宋体">格式。但是，</span><span lang="EN-US">EXE</span><span style="FONT-FAMILY: 宋体">格式的程序集可以在命令行上执行。如果找不到这个程序集，就会抛出</span><span lang="EN-US">System.IO.FileNot FoundException</span><span style="FONT-FAMILY: 宋体">异常。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">运行</span><span lang="EN-US">DomainTest.exe</span><span style="FONT-FAMILY: 宋体">程序后，会得到如图</span><span lang="EN-US">13-2</span><span style="FONT-FAMILY: 宋体">所示的控制台输出。</span><span lang="EN-US">DomainTest.exe</span><span style="FONT-FAMILY: 宋体">是第一个应用程序域的名称。第二行是</span><span lang="EN-US">New AppDomain</span><span style="FONT-FAMILY: 宋体">中新加载的程序集的输出结果。在进程浏览器中看不到进程</span><span lang="EN-US">Assembly1.exe</span><span style="FONT-FAMILY: 宋体">的执行，因为没有创建新进程，</span><span lang="EN-US">AssemblyA</span><span style="FONT-FAMILY: 宋体">被加载到过程</span><span lang="EN-US">DomainTest.exe</span><span style="FONT-FAMILY: 宋体">中。</span></p>
<p align="center"><span lang="EN-US"><img height="75" src="13/image002.jpg" width="280" alt="" /></span></p>
<p style="FTEL: 8.15pt" align="center"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US"> 13-2</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17.6pt"><span style="FONT-FAMILY: 宋体">在新加载的程序集中，还可以再创建一个新实例，以替代调用</span><span lang="EN-US">Main()</span><span style="FONT-FAMILY: 宋体">方法。在下面的例子中，用</span><span lang="EN-US">CreateInstance()</span><span style="FONT-FAMILY: 宋体">替代</span><span lang="EN-US">ExecuteAssembly()</span><span style="FONT-FAMILY: 宋体">方法，它的第一个参数是程序集名</span><span lang="EN-US">AssemblyA</span><span style="FONT-FAMILY: 宋体">，第二个参数定义了应实例化的类</span><span lang="EN-US">Wrox.ProCSharp.Assemblies.AppDomains.Class1</span><span style="FONT-FAMILY: 宋体">，第三个参数</span><span lang="EN-US">true</span><span style="FONT-FAMILY: 宋体">表示不区分大小写。</span><span lang="EN-US">System.Reflection.BindingFlags.CreateInstance</span><span style="FONT-FAMILY: 宋体">是一个绑定标志枚举值，指定应调用的构造函数：</span></p>
<p class="a6" style="MARGIN-TOP: 8.15pt"><span lang="EN-US"> AppDomain secondDomain = AppDomain.CreateDomain("New AppDomain");</span></p>
<p class="2"><span lang="EN-US"> // secondDomain.ExecuteAssembly("AssemblyA.exe");</span></p>
<p class="2"><span lang="EN-US"> </span></p>
<p class="2"><span lang="EN-US"> secondDomain.CreateInstance("AssemblyA",</span></p>
<p class="2"><span lang="EN-US"> "Wrox.ProCSharp.Assemblies.AppDomains.Class1", true,</span></p>
<p class="2"><span lang="EN-US"> System.Reflection.BindingFlags.CreateInstance,</span></p>
<p class="2" style="FTEL: 8.15pt"><span lang="EN-US"> null, new object[] {7, 3}, null, null, null);</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在应用程序成功运行后，会得到如图</span><span lang="EN-US">13-3</span><span style="FONT-FAMILY: 宋体">所示的控制台输出。</span></p>
<p align="center"><span lang="EN-US" style="FONT-SIZE: 7pt"><img height="85" src="13/image003.jpg" width="377" alt="" /></span></p>
<p style="FTEL: 8.15pt" align="center"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US"> 13-3</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17.6pt"><span style="FONT-FAMILY: 宋体">前面介绍了如何创建和调用应用程序域，在运行期间，主应用程序域会自动创建。</span><span lang="EN-US">ASP.NET</span><span style="FONT-FAMILY: 宋体">为每个运行在</span><span lang="EN-US">Web</span><span style="FONT-FAMILY: 宋体">服务器上的</span><span lang="EN-US">Web</span><span style="FONT-FAMILY: 宋体">应用程序创建一个应用程序域。</span><span lang="EN-US">Internet Explorer</span><span style="FONT-FAMILY: 宋体">创建运行托管控件的应用程序域。对于应用程序，如果要卸载一个程序集，创建应用程序域是非常有效的。卸载程序集只能通过中断应用程序域来进行。</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='100165395.htm'><font color='red'>13.1.3 应用程序域和程序集</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165392.htm'>13.1 程序集的含义</a></div><div style='float:right;width:49%'>·<a href='100165393.htm'>13.1.1 DLL-Hell的解决方案</a></div><div style='float:left;width:49%'>·<a href='100165394.htm'>13.1.2 程序集的特性</a></div><div style='float:right;width:49%'>·<a href='100165396.htm'>13.2 程序集的结构</a></div><div style='float:left;width:49%'>·<a href='100165397.htm'>13.2.1 程序集的清单</a></div><div style='float:right;width:49%'>·<a href='100165398.htm'>13.2.2 命名空间、程序集和组件</a></div></div>
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