100165823.htm
来自「C#高级编程(第三版),顶死你们。。 。up」· HTM 代码 · 共 286 行 · 第 1/5 页
HTM
286 行
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">还需要重载运算符</span><span lang="EN-US">!=</span><span style="FONT-FAMILY: 宋体">，采用的方式如下：</span></p>
<p class="2" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> public static bool operator != (Vector lhs, Vector rhs)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> return ! (lhs == rhs);</span></p>
<p class="2" style="MARGIN: 0cm 0cm 8.15pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">像往常一样，用一些测试代码检查重写方法的工作情况，这次定义</span><span lang="EN-US" style="LETTER-SPACING: -0.1pt">3</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">个</span><span lang="EN-US" style="LETTER-SPACING: -0.1pt">Vector</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">，并进行比较：</span></p>
<p class="a6" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> static void Main()</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> Vector vect1, vect2, vect3;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> vect1 = new Vector(3.0, 3.0,</span><span style="FONT-FAMILY: 宋体">–</span><span lang="EN-US">10.0);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> vect2 = new Vector(3.0, 3.0,</span><span style="FONT-FAMILY: 宋体">–</span><span lang="EN-US">10.0);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> vect3 = new Vector(2.0, 3.0, 6.0);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> Console.WriteLine("vect1= =vect2 returns " + (vect1= =vect2));</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> Console.WriteLine("vect1= =vect3 returns " + (vect1= =vect3));</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> Console.WriteLine("vect2= =vect3 returns " + (vect2= =vect3));</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> Console.WriteLine();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> Console.WriteLine("vect1!=vect2 returns " + (vect1!=vect2));</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> Console.WriteLine("vect1!=vect3 returns " + (vect1!=vect3));</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> Console.WriteLine("vect2!=vect3 returns " + (vect2!=vect3));</span></p>
<p class="a6" style="MARGIN: 0cm 0cm 8.15pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> }</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">编译这些代码，会得到一个编译器警告，因为我们没有为</span><span lang="EN-US">Vector</span><span style="FONT-FAMILY: 宋体">重写</span><span lang="EN-US">Equals()</span><span style="FONT-FAMILY: 宋体">，对于本例，这是不重要的，所以我们会忽略它。</span></p>
<p class="a6" style="MARGIN: 8.15pt 0cm 6pt 9.95pt; TEXT-INDENT: 9.95pt"><strong><span lang="EN-US">csc Vectors3.cs</span></strong></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">Microsoft (R) Visual C# .NET Compiler version 7.00.9466</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">for Microsoft (R) .NET Framework version 1.0.3705</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">Copyright (C) Microsoft Corporation 2001. All rights reserved.</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">Vectors3.cs(5,11): warning CS0660: 'Wrox.ProCSharp.OOCSharp.Vector' defines</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> operator = = or operator != but does not override Object.Equals(object o)</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">Vectors3.cs(5,11): warning CS0661: 'Wrox.ProCSharp.OOCSharp.Vector' defines</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> operator = = or operator != but does not override Object.GetHashCode()</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在命令行上运行该示例，生成如下结果：</span></p>
<p class="a6" style="MARGIN: 16.35pt 0cm 6pt 9.95pt; TEXT-INDENT: 9.95pt"><strong><span lang="EN-US">Vectors3</span></strong></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">vect1= =vect2 returns True</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">vect1= =vect3 returns False</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">vect2= =vect3 returns False</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">vect1!=vect2 returns False</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">vect1!=vect3 returns True</span></p>
<p class="a6" style="MARGIN: 0cm 0cm 8.15pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">vect2!=vect3 returns True</span></p>
<h4 style="TEXT-INDENT: 21.45pt"><span><span lang="EN-US">3. </span></span><span style="FONT-FAMILY: 黑体">可以重载的运算符</span></h4>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">并不是所有的运算符都可以重载。可以重载的运算符如表</span><span lang="EN-US">5-4</span><span style="FONT-FAMILY: 宋体">所示。</span></p>
<p class="a5" style="MARGIN-TOP: 8.15pt"><span style="FONT-FAMILY: 黑体">表</span><span lang="EN-US"> 5-4</span></p>
<div align="center">
<table class="MsoNormalTable" style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; WIDTH: 439.9pt; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="587" border="1">
<tbody>
<tr>
<td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 1.4pt; BORDER-LEFT: medium none; WIDTH: 113.65pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="152">
<p class="a2"><span style="FONT-FAMILY: 黑体">类</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'"> </span><span style="FONT-FAMILY: 黑体">别</span></p>
</td>
<td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 1.4pt; BORDER-LEFT: medium none; WIDTH: 132.7pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="177">
<p class="a2"><span style="FONT-FAMILY: 黑体">运</span><span style="FONT-FAMILY: 'Times New Roman'"> </span><span style="FONT-FAMILY: 黑体">算</span><span style="FONT-FAMILY: 'Times New Roman'"> </span><span style="FONT-FAMILY: 黑体">符</span></p>
</td>
<td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 1.4pt; BORDER-LEFT: medium none; WIDTH: 193.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1p⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?