58 lines
2.1 KiB
XML
58 lines
2.1 KiB
XML
<?xml version="1.0"?>
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<clause number="17.4.5.1" title="Static field initialization">
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<paragraph>The static field variable initializers of a class correspond to a sequence of assignments that are executed in the textual order in which they appear in the class declaration. If a static constructor (<hyperlink>17.11</hyperlink>) exists in the class, execution of the static field initializers occurs immediately prior to executing that static constructor. Otherwise, the static field initializers are executed at an implementation-dependent time prior to the first use of a static field of that class. <example>[Example: The example <code_example><![CDATA[
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using System;
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class Test
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{
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static void Main() {
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Console.WriteLine("{0} {1}", B.Y, A.X);
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}
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public static int f(string s) {
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Console.WriteLine(s);
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return 1;
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}
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}
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class A
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{
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public static int X = Test.f("Init A");
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}
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class B
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{
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public static int Y = Test.f("Init B");
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}
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]]></code_example>might produce either the output: <code_example><![CDATA[
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Init A
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Init B
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1 1
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]]></code_example>or the output: <code_example><![CDATA[
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Init B
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Init A
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1 1
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]]></code_example>because the execution of X's initializer and Y's initializer could occur in either order; they are only constrained to occur before the references to those fields. However, in the example: <code_example><![CDATA[
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using System;
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class Test {
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static void Main() {
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Console.WriteLine("{0} {1}", B.Y, A.X);
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}
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public static int f(string s) {
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Console.WriteLine(s);
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return 1;
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}
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}
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class A
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{
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static A() {}
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public static int X = Test.f("Init A");
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}
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class B
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{
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static B() {}
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public static int Y = Test.f("Init B");
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}
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]]></code_example>the output must be: <code_example><![CDATA[
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Init B
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Init A
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1 1
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]]></code_example>because the rules for when static constructors execute provide that B's static constructor (and hence B's static field initializers) must run before A's static constructor and field initializers. end example]</example> </paragraph>
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</clause>
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