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📁 C#高级编程(第三版),顶死你们。。。up
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">D</span></p>
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            <p class="a4" style="MARGIN-LEFT: 0cm"><span style="FONT-FAMILY: 宋体">十进制格式，把整数转换为以</span><span lang="EN-US">10</span><span style="FONT-FAMILY: 宋体">为基数的数，如果给定一个精度说明符，就加上前导</span><span lang="EN-US">0</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 1.4pt; BORDER-LEFT: medium none; WIDTH: 68.95pt; PADDING-TOP: 1.4pt; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="92">
            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">E</span></p>
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            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 1.4pt; BORDER-LEFT: medium none; WIDTH: 369.2pt; PADDING-TOP: 1.4pt; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="492">
            <p class="a4" style="MARGIN-LEFT: 0cm"><span style="FONT-FAMILY: 宋体">科学计数法</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">指数</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">格式。精度说明符设置小数位数</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">默认情况下为</span><span lang="EN-US">6)</span><span style="FONT-FAMILY: 宋体">。格式字符串的大小写</span><span lang="EN-US">(&quot;e&quot; </span><span style="FONT-FAMILY: 宋体">或</span><span lang="EN-US"> &quot;E&quot;)</span><span style="FONT-FAMILY: 宋体">确定指数符号的大小写</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 1.4pt; BORDER-LEFT: medium none; WIDTH: 68.95pt; PADDING-TOP: 1.4pt; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="92">
            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">F</span></p>
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            <p class="a4" style="MARGIN-LEFT: 0cm"><span style="FONT-FAMILY: 宋体">固定点格式，精度说明符设置小数位数，可以为</span><span lang="EN-US">0</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 1.4pt; BORDER-LEFT: medium none; WIDTH: 68.95pt; PADDING-TOP: 1.4pt; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="92">
            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">G</span></p>
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            <p class="a4" style="MARGIN-LEFT: 0cm"><span style="FONT-FAMILY: 宋体">普通格式，使用</span><span lang="EN-US">E </span><span style="FONT-FAMILY: 宋体">或</span><span lang="EN-US"> F</span><span style="FONT-FAMILY: 宋体">格式取决于哪种格式最简单</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">N</span></p>
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            <p class="a4" style="MARGIN-LEFT: 0cm"><span style="FONT-FAMILY: 宋体">数字格式，用逗号表示千分符，例如</span><span lang="EN-US">32 767.44</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">P</span></p>
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            <p class="a4" style="MARGIN-LEFT: 0cm"><span style="FONT-FAMILY: 宋体">百分数格式</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">X</span></p>
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            <p class="a4" style="MARGIN-LEFT: 0cm"><span lang="EN-US">16</span><span style="FONT-FAMILY: 宋体">进制格式，精度说明符用于加上前导</span><span lang="EN-US">0</span></p>
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<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">注意格式字符串都不需要考虑大小写，除</span><span lang="EN-US">e/E</span><span style="FONT-FAMILY: 宋体">之外。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">如果要使用格式字符串，应把它放在给出参数个数和字段宽度的标记后面，并用一个冒号把它们分隔开。例如，要把</span><span lang="EN-US">decimal</span><span style="FONT-FAMILY: 宋体">值格式化为货币格式，且使用计算机上的地区设置，其精度为两位小数，则使用</span><span lang="EN-US">C2</span><span style="FONT-FAMILY: 宋体">：</span></p>
<p class="2" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">decimal i = 940.23m;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">decimal j = 73.7m;</span></p>
<p class="2" style="MARGIN: 0cm 0cm 8.15pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">Console.WriteLine(&quot; {0,9:C2}\n+{1,9:C2}\n </span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1.2pt">&ndash;&ndash;&ndash;&ndash;&ndash;&ndash;</span><span lang="EN-US">\n {2,9:C2}&quot;, i, j, i + j);</span></p>
<p class="MsoToc1"><span style="FONT-FAMILY: 宋体">在美国，其结果是：</span></p>
<p class="a6" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; $940.23</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">+&nbsp;&nbsp; $73.70</span></p>
<p class="a6" style="MARGIN-LEFT: 9.95pt; TEXT-INDENT: 27.9pt"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -1.2pt">&ndash;&ndash;&ndash;&ndash;&ndash;&ndash;&ndash;</span></p>
<p class="a6" style="MARGIN: 0cm 0cm 8.15pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">&nbsp;$1,013.93</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">最后一个技巧是，可以使用占位符来代替这些格式字符串，例如：</span></p>
<p class="2" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">double d = 0.234;</span></p>
<p class="2" style="MARGIN: 0cm 0cm 8.15pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">Console.WriteLine(&quot;{0:#.00}&quot;, d);</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">其结果为</span><span lang="EN-US">0.23</span><span style="FONT-FAMILY: 宋体">，因为如果在符号</span><span lang="EN-US">(#)</span><span style="FONT-FAMILY: 宋体">的位置上没有字符，就会忽略该符号</span><span lang="EN-US">(#)</span><span style="FONT-FAMILY: 宋体">，如果</span><span lang="EN-US">0</span><span style="FONT-FAMILY: 宋体">的位置上有一个字符，就用这个字符代替</span><span lang="EN-US">0</span><span style="FONT-FAMILY: 宋体">，否则就显示</span><span lang="EN-US">0</span><span style="FONT-FAMILY: 宋体">。</span></p></div>
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