📄 10.6.htm

📁 This ECMA Standard specifies the form and establishes the interpretation of programs written in the
💻 HTM
字号:
<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="10.5.4.htm"><img src="previous.gif" alt="previous" border="0" /></a><a href="10.7.htm"><img src="next.gif" alt="next" border="0" /></a></span><span class="clause-depth"><a href="9.htm"><img src="previous.gif" alt="previous at this level" border="0" /></a><a href="11.htm"><img src="next.gif" alt="next at this level" border="0" /></a> <span class="clause-number-link"><a href="10.htm">10</a></span><span class="clause-title-previous"> Basic concepts</span></span><span class="clause-depth"><a href="10.5.htm"><img src="previous.gif" alt="previous at this level" border="0" /></a><a href="10.7.htm"><img src="next.gif" alt="next at this level" border="0" /></a> <span class="clause-number">10.6</span><span class="clause-title"> Signatures and overloading</span></span><span class="locator">
     Paragraph 1</span><span class="paragraph"><span class="sentence"><span class="sentence-number">1</span> <a name="P1S1"></a>Methods, instance constructors, indexers, and operators are characterized by their signatures: </span><ul><li><span class="sentence"><span class="sentence-number">2</span> <a name="P1S2"></a> The signature of a method consists of the name of the method and the type and kind (value, reference, or output) of each of its formal parameters, considered in the order left to right.</span> <span class="sentence"><span class="sentence-number">3</span> <a name="P1S3"></a>The signature of a method specifically does not include the return type, nor does it include the params modifier that may be specified for the right-most parameter.</span> </li><li><span class="sentence"><span class="sentence-number">4</span> <a name="P1S4"></a> The signature of an instance constructor consists of the type and kind (value, reference, or output) of each of its formal parameters, considered in the order left to right.</span> <span class="sentence"><span class="sentence-number">5</span> <a name="P1S5"></a>The signature of an instance constructor specifically does not include the params modifier that may be specified for the right-most parameter.</span> </li><li><span class="sentence"><span class="sentence-number">6</span> <a name="P1S6"></a> The signature of an indexer consists of the type of each of its formal parameters, considered in the order left to right.</span> <span class="sentence"><span class="sentence-number">7</span> <a name="P1S7"></a>The signature of an indexer specifically does not include the element type.</span> </li><li><span class="sentence"><span class="sentence-number">8</span> <a name="P1S8"></a> The signature of an operator consists of the name of the operator and the type of each of its formal parameters, considered in the order left to right.</span> <span class="sentence"><span class="sentence-number">9</span> <a name="P1S9"></a>The signature of an operator specifically does not include the result type.</span> </li></ul></span><span class="locator">
     Paragraph 2</span><span class="paragraph"><span class="sentence"><span class="sentence-number">1</span> <a name="P2S1"></a>Signatures are the enabling mechanism for overloading of members in classes, structs, and interfaces: </span><ul><li><span class="sentence"><span class="sentence-number">2</span> <a name="P2S2"></a> Overloading of methods permits a class, struct, or interface to declare multiple methods with the same name, provided their signatures are unique within that class, struct, or interface.</span> </li><li><span class="sentence"><span class="sentence-number">3</span> <a name="P2S3"></a> Overloading of instance constructors permits a class or struct to declare multiple instance constructors, provided their signatures are unique within that class or struct.</span> </li><li><span class="sentence"><span class="sentence-number">4</span> <a name="P2S4"></a> Overloading of indexers permits a class, struct, or interface to declare multiple indexers, provided their signatures are unique within that class, struct, or interface.</span> </li><li><span class="sentence"><span class="sentence-number">5</span> <a name="P2S5"></a> Overloading of operators permits a class or struct to declare multiple operators with the same name, provided their signatures are unique within that class or struct.</span> </li></ul></span><span class="paragraph"><span class="example">[Example: The following example shows a set of overloaded method declarations along with their signatures. <pre class="code-example">
interface ITest  
{  
   void F();              // F()  
   void F(int x);      // F(int)  
   void F(ref int x);     // F(ref int)  
   void F(out int x);     // F(out int)  
   void F(int x, int y);      // F(int, int)  
   int F(string s);      // F(string)  
   int F(int x);            // F(int)        error   
   void F(string[] a);     // F(string[])  
   void F(params string[] a);   // F(string[])   error  
}  
</pre></span></span><span class="paragraph"><span class="example">Note that any ref and out parameter modifiers (<a href="17.5.1.htm">&#167;17.5.1</a>) are part of a signature. Thus, F(<span class="keyword">int</span>), F(ref <span class="keyword">int</span>), and F(out <span class="keyword">int</span>) are all unique signatures. Also, note that the return type and the params modifier are not part of a signature, so it is not possible to overload solely based on return type or on the inclusion or exclusion of the params modifier. As such, the declarations of the methods F(<span class="keyword">int</span>) and F(params string[]) identified above, result in a compile-time error. end example]</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

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -