利用反射调用一个继承层次上的函数族代码,CSharp代码库,德仔网

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【CSharp】利用反射调用一个继承层次上的函数族
作者: / 发布于2011/1/14/ 646
利用反射调用一个继承层次上的函数族，比如安装程序，有安装数据库的，安装文件系统的等，命名均已“install”开始，你就可以将参数part设为“install”，src是其实类实例，root是终止父类
<div><span style="color: #008000">//</span><span style="color: #008000">利用反射调用一个继承层次上的函数族，比如安装程序，有安装数据库的，安装文件系统的等，命名均已&ldquo;install&rdquo;开始，你就可以将参数part设为&ldquo;install&rdquo;，src是其实类实例，root是终止父类</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #000000"><</span><span style="color: #000000">T</span><span style="color: #000000">></span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> invokeMethods(String part,T src,Class root) </span><span style="color: #0000ff">throws</span><span style="color: #000000"> ExceptionManager{
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (root</span><span style="color: #000000">!=</span><span style="color: #0000ff">null</span><span style="color: #000000">){
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (</span><span style="color: #000000">!</span><span style="color: #000000">root.isInstance(src))</span><span style="color: #0000ff">return</span><span style="color: #000000">;
 root</span><span style="color: #000000">=</span><span style="color: #000000">(Class)root.getGenericSuperclass();
 }
 HashMap</span><span style="color: #000000"><</span><span style="color: #000000">String,Method</span><span style="color: #000000">></span><span style="color: #000000"> invokees</span><span style="color: #000000">=</span><span style="color: #0000ff">new</span><span style="color: #000000"> HashMap</span><span style="color: #000000"><</span><span style="color: #000000">String,Method</span><span style="color: #000000">></span><span style="color: #000000">();
 Class target</span><span style="color: #000000">=</span><span style="color: #000000">src.getClass();
 </span><span style="color: #0000ff">do</span><span style="color: #000000">{
 Method [] methods</span><span style="color: #000000">=</span><span style="color: #000000">target.getDeclaredMethods();
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (Method method:methods){
 String mn</span><span style="color: #000000">=</span><span style="color: #000000">method.getName();
 Boolean isPass</span><span style="color: #000000">=</span><span style="color: #000000">mn.startsWith(part);
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (isPass){
 Integer nopt</span><span style="color: #000000">=</span><span style="color: #000000">method.getParameterTypes().length;
 Boolean isStatic</span><span style="color: #000000">=</span><span style="color: #000000">Modifier.isStatic(method.getModifiers());
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> ((nopt</span><span style="color: #000000">==</span><span style="color: #000000">0</span><span style="color: #000000">)</span><span style="color: #000000">&&</span><span style="color: #000000">(</span><span style="color: #000000">!</span><span style="color: #000000">isStatic)){
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (</span><span style="color: #000000">!</span><span style="color: #000000">invokees.containsKey(mn))
 invokees.put(mn, method);
 }
 }
 }
 target</span><span style="color: #000000">=</span><span style="color: #000000">(Class)target.getGenericSuperclass();
 }</span><span style="color: #0000ff">while</span><span style="color: #000000">(target</span><span style="color: #000000">!=</span><span style="color: #000000">root);
 Iterator</span><span style="color: #000000"><</span><span style="color: #000000">String</span><span style="color: #000000">></span><span style="color: #000000"> methods</span><span style="color: #000000">=</span><span style="color: #000000">invokees.keySet().iterator();
 </span><span style="color: #0000ff">while</span><span style="color: #000000"> (methods.hasNext()){
 Method invokee</span><span style="color: #000000">=</span><span style="color: #000000">invokees.get(methods.next());
 Boolean access</span><span style="color: #000000">=</span><span style="color: #000000">invokee.isAccessible();
 invokee.setAccessible(</span><span style="color: #0000ff">true</span><span style="color: #000000">);
 </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
 invokee.invoke(src);
 } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (InvocationTargetException e) {
 </span><span style="color: #0000ff">throw</span><span style="color: #000000"> ExceptionManager.wrap(e.getTargetException());
 }</span><span style="color: #0000ff">catch</span><span style="color: #000000"> (Exception e){}
 invokee.setAccessible(access);
 }
 }</span>
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