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17.5.3 创建DatabaseResourceManager类
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17.5.3 创建DatabaseResourceManager类
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2006-10-13 14:41:00
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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='100165508.htm'><font color='red'>17.5.3 创建DatabaseResourceManager类</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165505.htm'>17.5 定制的资源读取器</a></div><div style='float:right;width:49%'>·<a href='100165506.htm'>17.5.1 创建DatabaseResourceReader类</a></div><div style='float:left;width:49%'>·<a href='100165507.htm'>17.5.2 创建DatabaseResourceSet类</a></div><div style='float:right;width:49%'>·<a href='100165509.htm'>17.5.4 DatabaseResourceReader的客户应用程序</a></div><div style='float:left;width:49%'>·<a href='100165510.htm'>17.6 小结</a></div><div style='float:right;width:49%'>·<a href='100165511.htm'>18.1 部署的设计</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"><span lang="EN-US">17.5.3 </span><span style="FONT-FAMILY: 黑体">创建</span><span lang="EN-US">DatabaseResourceManager</span><span style="FONT-FAMILY: 黑体">类</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">第三个要创建的类是定制的资源管理器</span><span lang="EN-US">DatabaseResourceManager</span><span style="FONT-FAMILY: 宋体">，它派生于类</span><span lang="EN-US">ResourceManager</span><span style="FONT-FAMILY: 宋体">，我们还需要执行一个新的构造函数，并重写方法</span><span lang="EN-US">InternalGetResourceSet()</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在构造函数中，创建一个新的散列表，来存储所有查询到的资源集，并把它们放在由基类定义的字段</span><span lang="EN-US">ResourceSets</span><span style="FONT-FAMILY: 宋体">中。</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">public class DatabaseResourceManager : ResourceManager</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> private string dsn;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> public DatabaseResourceManager(string dsn)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> this.dsn = dsn;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 36.85pt"><span lang="EN-US"> ResourceSets = new Hashtable();</span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 36.85pt"><span lang="EN-US">}</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17.5pt"><span style="FONT-FAMILY: 宋体">可以使用</span><span lang="EN-US">ResourceManager</span><span style="FONT-FAMILY: 宋体">类中的方法</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">例如</span><span lang="EN-US">GetString()</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">GetObject())</span><span style="FONT-FAMILY: 宋体">来访问资源，并调用方法</span><span lang="EN-US">InternalGetResourceSet()</span><span style="FONT-FAMILY: 宋体">来访问资源集，返回适当的值。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17.5pt"><span style="FONT-FAMILY: 宋体">在方法</span><span lang="EN-US">InternalGetResourceSet()</span><span style="FONT-FAMILY: 宋体">的执行代码中，首先检查被查询到的文化的资源集是否已在散列表中，如果是，就把它们返回给调用程序。如果资源集不在散列表中，就用查询到的文化创建一个新对象</span><span lang="EN-US">DatabaseResourceSet</span><span style="FONT-FAMILY: 宋体">，并把它添加到散列表中，再将它返回给调用程序。</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"> protected override ResourceSet InternalGetResourceSet(</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 60.3pt"><span lang="EN-US">CultureInfo culture, bool createIfNotExists, bool tryParents)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> DatabaseResourceSet rs = null;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> If (ResourceSets.Contains(culture.Name))</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> rs = ResourceSets[culture.Name] as DatabaseResourceSet;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> else</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> rs = new DatabaseResourceSet(dsn, culture);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> ResourceSets.Add(culture.Name, rs);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; FTEL: 18.45pt"><span lang="EN-US"> return rs;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 14.5pt; 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></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='100165508.htm'><font color='red'>17.5.3 创建DatabaseResourceManager类</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165505.htm'>17.5 定制的资源读取器</a></div><div style='float:right;width:49%'>·<a href='100165506.htm'>17.5.1 创建DatabaseResourceReader类</a></div><div style='float:left;width:49%'>·<a href='100165507.htm'>17.5.2 创建DatabaseResourceSet类</a></div><div style='float:right;width:49%'>·<a href='100165509.htm'>17.5.4 DatabaseResourceReader的客户应用程序</a></div><div style='float:left;width:49%'>·<a href='100165510.htm'>17.6 小结</a></div><div style='float:right;width:49%'>·<a href='100165511.htm'>18.1 部署的设计</a></div></div>
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