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How do we use a #line directive in C#?
It lets you modify the compiler's line number and (optionally) the file name output for errors and warnings.
Let us see some examples.
#line 100 "demo" int a; // CS0168 on line 100 int b; // CS0168 on line 101 int c; // CS0168 on line 102
As shown above the example reports three warnings associated with line numbers. The #line 100 directive forces the line number to be 100 and until the next #line directive, the filename will be reported as "demo”.
Let’s see another example: The default directive returns the line numbering to its default numbering. This directive then counts the lines that were renumbered by the previous directive.
#line default char a; // CS0168 on line 15 float b; // CS0168 on line 16
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