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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="24.3.1.htm"><img src="previous.gif" alt="previous" border="0" /></a><a href="24.4.htm"><img src="next.gif" alt="next" border="0" /></a></span><span class="clause-depth"><a href="23.htm"><img src="previous.gif" alt="previous at this level" border="0" /></a><a href="25.htm"><img src="next.gif" alt="next at this level" border="0" /></a> <span class="clause-number-link"><a href="24.htm">24</a></span><span class="clause-title-previous"> Attributes</span></span><span class="clause-depth"><a href="24.2.htm"><img src="previous.gif" alt="previous at this level" border="0" /></a><a href="24.4.htm"><img src="next.gif" alt="next at this level" border="0" /></a> <span class="clause-number-link"><a href="24.3.htm">24.3</a></span><span class="clause-title-previous"> Attribute instances</span></span><span class="clause-depth"><a href="24.3.1.htm"><img src="previous.gif" alt="previous at this level" border="0" /></a><a href="24.3.2.htm"><img src="next.gif" alt="next at this level" border="0" /></a> <span class="clause-number">24.3.2</span><span class="clause-title"> Run-time retrieval of an attribute instance</span></span><span class="locator">
Paragraph 1</span><span class="paragraph"><span class="sentence"><span class="sentence-number">1</span> <a name="P1S1"></a>Compilation of an attribute yields an attribute class T, an instance constructor C on T, a <span class="non-terminal"><a href="24.2.htm#positional-argument-list">positional-argument-list</a></span> P, and a <span class="non-terminal"><a href="24.2.htm#named-argument-list">named-argument-list</a></span> N.</span> <span class="sentence"><span class="sentence-number">2</span> <a name="P1S2"></a>Given this information, an attribute instance can be retrieved at run-time using the following steps: </span><ul><li><span class="sentence"><span class="sentence-number">3</span> <a name="P1S3"></a> Follow the run-time processing steps for executing an <span class="non-terminal"><a href="14.5.10.1.htm#object-creation-expression">object-creation-expression</a></span> of the form new T(P), using the instance constructor C as determined at compile-time.</span> <span class="sentence"><span class="sentence-number">4</span> <a name="P1S4"></a>These steps either result in an exception, or produce an instance of T.</span> <span class="sentence"><span class="sentence-number">5</span> <a name="P1S5"></a>Call this instance O.</span> </li><li><span class="sentence"><span class="sentence-number">6</span> <a name="P1S6"></a> For each <span class="non-terminal"><a href="24.2.htm#named-argument">named-argument</a></span> Arg in N, in order: </span></li><ul><li><span class="sentence"><span class="sentence-number">7</span> <a name="P1S7"></a> Let Name be the identifier of the <span class="non-terminal"><a href="24.2.htm#named-argument">named-argument</a></span> Arg.</span> <span class="sentence"><span class="sentence-number">8</span> <a name="P1S8"></a>If Name does not identify a non-static public read-write field or property on O, then an exception is thrown.</span> </li><li><span class="sentence"><span class="sentence-number">9</span> <a name="P1S9"></a> Let Value be the result of evaluating the <span class="non-terminal"><a href="24.2.htm#attribute-argument-expression">attribute-argument-expression</a></span> of Arg.</span> </li><li><span class="sentence"><span class="sentence-number">10</span> <a name="P1S10"></a> If Name identifies a field on O, then set this field to the value Value.</span> </li><li><span class="sentence"><span class="sentence-number">11</span> <a name="P1S11"></a> Otherwise, Name identifies a property on O.</span> <span class="sentence"><span class="sentence-number">12</span> <a name="P1S12"></a>Set this property to the value Value.</span> </li><li><span class="sentence"><span class="sentence-number">13</span> <a name="P1S13"></a> The result is O, an instance of the attribute class T that has been initialized with the <span class="non-terminal"><a href="24.2.htm#positional-argument-list">positional-argument-list</a></span> P and the <span class="non-terminal"><a href="24.2.htm#named-argument-list">named-argument-list</a></span> N.</span> </li></ul></ul></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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