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  Prism.languages.csharp = Prism.languages.extend('clike', {
  	'keyword': /\b(abstract|as|async|await|base|bool|break|byte|case|catch|char|checked|class|const|continue|decimal|default|delegate|do|double|else|enum|event|explicit|extern|false|finally|fixed|float|for|foreach|goto|if|implicit|in|int|interface|internal|is|lock|long|namespace|new|null|object|operator|out|override|params|private|protected|public|readonly|ref|return|sbyte|sealed|short|sizeof|stackalloc|static|string|struct|switch|this|throw|true|try|typeof|uint|ulong|unchecked|unsafe|ushort|using|virtual|void|volatile|while|add|alias|ascending|async|await|descending|dynamic|from|get|global|group|into|join|let|orderby|partial|remove|select|set|value|var|where|yield)\b/,
  	'string': [
  		/@("|')(\1\1|\\\1|\\?(?!\1)[\s\S])*\1/,
  		/("|')(\\?.)*?\1/
  	],

  	'number': /\b-?(0x[\da-f]+|\d*\.?\d+f?)\b/i

  });
  
  Prism.languages.insertBefore('csharp', 'keyword', {
  	'preprocessor': {
  		pattern: /(^\s*)#.*/m,

  		lookbehind: true,
  		alias: 'property',
  		inside: {
  			// highlight preprocessor directives as keywords
  			'directive': {
  				pattern: /(\s*#)\b(define|elif|else|endif|endregion|error|if|line|pragma|region|undef|warning)\b/,
  				lookbehind: true,
  				alias: 'keyword'
  			}
  		}

  	}
  });