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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Hyperlinked ECMA C# Language Specification</title><meta name="author" content="Jon Jagger" /><link rel="stylesheet" href="ecma334.css"></link></head><body><div align="right"><em><a href="http://www.jaggersoft.com">Jon Jagger</a></em></div><div align="right"><a href="mailto:jon@jaggersoft.com">jon@jaggersoft.com</a></div><form method="get" action="http://search.atomz.com/search/"><input size="30" name="sp-q"></input><input type="submit" value="Search C# Spec"></input><input type="hidden" name="sp-a" value="sp10024177"></input><input type="hidden" name="sp-f" value="ISO-8859-1"></input></form><a href="toc.htm">Table of Contents</a> <a href="1.htm">1</a> <a href="2.htm">2</a> <a href="3.htm">3</a> <a href="4.htm">4</a> <a href="5.htm">5</a> <a href="6.htm">6</a> <a href="7.htm">7</a> <a href="8.htm">8</a> <a href="9.htm">9</a> <a href="10.htm">10</a> <a href="11.htm">11</a> <a href="12.htm">12</a> <a href="13.htm">13</a> <a href="14.htm">14</a> <a href="15.htm">15</a> <a href="16.htm">16</a> <a href="17.htm">17</a> <a href="18.htm">18</a> <a href="19.htm">19</a> <a href="20.htm">20</a> <a href="21.htm">21</a> <a href="22.htm">22</a> <a href="23.htm">23</a> <a href="24.htm">24</a> <a href="25.htm">25</a> <a href="notes.htm">Notes</a> <a href="HyperlinkedCSharpECMA.zip">Download</a><span class="ruler"></span><span class="heading">ECMA-334 C# Language Specification</span><span class="navigate"><a href="8.2.1.htm"><img src="previous.gif" alt="previous" border="0" /></a><a href="8.2.3.htm"><img src="next.gif" alt="next" border="0" /></a></span><span class="clause-depth"><a href="7.htm"><img src="previous.gif" alt="previous at this level" border="0" /></a><a href="9.htm"><img src="next.gif" alt="next at this level" border="0" /></a> <span class="clause-number-link"><a href="8.htm">8</a></span><span class="clause-title-previous"> Language Overview</span></span><span class="clause-depth"><a href="8.1.htm"><img src="previous.gif" alt="previous at this level" border="0" /></a><a href="8.3.htm"><img src="next.gif" alt="next at this level" border="0" /></a> <span class="clause-number-link"><a href="8.2.htm">8.2</a></span><span class="clause-title-previous"> Types</span></span><span class="clause-depth"><a href="8.2.1.htm"><img src="previous.gif" alt="previous at this level" border="0" /></a><a href="8.2.3.htm"><img src="next.gif" alt="next at this level" border="0" /></a> <span class="clause-number">8.2.2</span><span class="clause-title"> Conversions</span></span><span class="informative"><span class="paragraph">The predefined types also have predefined conversions. For instance, conversions exist between the predefined types <span class="keyword">int</span> and <span class="keyword">long</span>. C# differentiates between two kinds of conversions: implicit conversions and explicit conversions. Implicit conversions are supplied for conversions that can safely be performed without careful scrutiny. For instance, the conversion from <span class="keyword">int</span> to <span class="keyword">long</span> is an implicit conversion. This conversion always succeeds, and never results in a loss of information. The following example <pre class="code-example">
using System;
class Test
{
static void Main() {
int intValue = 123;
long longValue = intValue;
Console.WriteLine("{0}, {1}", intValue, longValue);
}
}
</pre>implicitly converts an <span class="keyword">int</span> to a <span class="keyword">long</span>. </span><span class="paragraph">In contrast, explicit conversions are performed with a cast expression. The example <pre class="code-example">
using System;
class Test
{
static void Main() {
long longValue = Int64.MaxValue;
int intValue = (int) longValue;
Console.WriteLine("(int) {0} = {1}", longValue, intValue);
}
}
</pre>uses an explicit conversion to convert a <span class="keyword">long</span> to an <span class="keyword">int</span>. The output is: <pre class="code-example">
(int) 9223372036854775807 = -1
</pre>because an overflow occurs. Cast expressions permit the use of both implicit and explicit conversions. </span></span><span class="ruler"></span><table><tr><td><table align="left" bgcolor="navy"><tr bgcolor="navy"><td><font face="Arial,sans-serif" size="6" color="yellow"><strong>{ JSL }</strong></font></td></tr></table></td></tr><tr><td><font face="Arial,sans-serif" size="2" color="navy"><strong>Jagger Software Ltd</strong></font></td></tr><tr><td><font face="Arial,sans-serif" size="2" color="navy"><strong>Company # 4070126</strong></font></td></tr><tr><td><font face="Arial,sans-serif" size="2" color="navy"><strong>VAT # 762 5213 42</strong></font></td></tr></table><img src="valid-html401.png" align="left" height="31" width="88" alt="Valid HTML 4.01" /><img src="vcss.gif" align="left" height="31" width="88" alt="Valid CSS" /></body></html>⌨️ 快捷键说明
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