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<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; public DirectoryInfo FolderNodeInfo</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; get {return _info;}</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp; }</span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="ES">}</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">现在构建</span><span lang="ES">FolderTree</span><span style="FONT-FAMILY: 宋体">控件。根据要求，我们需要一个属性来读取和设置</span><span lang="ES">RootFolder</span><span style="FONT-FAMILY: 宋体">，还需要</span><span lang="ES">ShowFiles</span><span style="FONT-FAMILY: 宋体">属性，来确定文件是否显示在树中。</span><span lang="ES">SelectedFolder</span><span style="FONT-FAMILY: 宋体">属性返回树中当前突出显示的文件夹。下面是</span><span lang="ES">FolderTree</span><span style="FONT-FAMILY: 宋体">控件的代码：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="ES">using System;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">using System.Windows.Forms;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">using System.IO;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">using System.ComponentModel;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">namespace FolderTree</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp; ///&lt;summary&gt;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp; /// Summary description for FolderTreeCtrl.</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp; ///&lt;summary&gt;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp; public class FolderTree : System.Windows.Forms.TreeView</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 27.65pt"><span lang="ES">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; string _rootFolder =&quot;&quot;;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; bool _showFiles = true;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; bool _inInit = false;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; public FolderTree()</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //TODO: Add constructor lagic here</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; [Category(&quot;Behavior&quot;),</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Description(&quot;Gets or sets the base or root folder of the tree&quot;),</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DefaultValue(&quot;C:\\&quot;)]</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; public string RootFolder</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; get {return _rootFolder;}</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; set</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp;&nbsp;&nbsp; _rootFolder = value;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp;&nbsp;&nbsp; if(!_inInit)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; InitializeTree();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">}</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">[Category(&quot;Behavior&quot;),</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Description(&quot;Indicates whether files will seen in the list.&quot;),</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DefaultValue(true)]</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp;&nbsp;&nbsp; public bool ShowFiles</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; get {return _showFiles;}</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; set {_showFiles = value;}</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">}</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">[Browsable(false)]</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">public string SelectedFolder</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; get</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp;&nbsp;&nbsp; if(this.SelectedNode is FolderNode)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return (FolderNode)this.SelectedNode).FolderPath;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; return&quot;&quot;;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">&nbsp; }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 36.85pt"><span lang="ES">}</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp; }</span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="ES">}</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">我们添加了</span><span lang="ES">3</span><span style="FONT-FAMILY: 宋体">个属性：</span><span lang="ES">ShowFiles</span><span style="FONT-FAMILY: 宋体">、</span><span lang="ES">SelectedFolder</span><span style="FONT-FAMILY: 宋体">和</span><span lang="ES">RootFolder</span><span style="FONT-FAMILY: 宋体">。注意已经添加的属性。为</span><span lang="ES">ShowFiles</span><span style="FONT-FAMILY: 宋体">和</span><span lang="ES">RootFolder</span><span style="FONT-FAMILY: 宋体">设置</span><span lang="ES">Category</span><span style="FONT-FAMILY: 宋体">、</span><span lang="ES">Description</span><span style="FONT-FAMILY: 宋体">和</span><span lang="ES">DefaultValues</span><span style="FONT-FAMILY: 宋体">。这两个属性显示在设计模式下的属性浏览器中。</span><span lang="ES">SelectedFolder</span><span style="FONT-FAMILY: 宋体">在设计期间没有什么意义，所以选择</span><span lang="ES">Browsable=false</span><span style="FONT-FAMILY: 宋体">属性。</span><span lang="ES">SelectedFolder</span><span style="FONT-FAMILY: 宋体">不在属性浏览器中显示，但由于它是一个公共属性，所以会在</span><span lang="ES">Intellisence</span><span style="FONT-FAMILY: 宋体">中出现，并可以通过代码访问它。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">接着，初始化文件系统的加载操作。初始化控件有点困难。在设计期间和运行期间进行初始化都必须仔细考虑。控件位于设计器中时，实际上是在运行。如果在构造函数中调用了一个<span style="LETTER-SPACING: 0.1pt">数据库，这个调用就是在设计器中拖放控件时进行的。在</span></span><span lang="ES" style="LETTER-SPACING: 0.1pt">FolderTree</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.1pt">控件中，这就存在一个问题。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下面看看加载文件的方法：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="ES">private void LoadTree(FolderNode folder)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp; string[] dirs = Diretory.GetDirecoties(folder.FolderPath);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="ES">&nbsp; foreach(string dir in dirs)</span></p>