(.NET Core C#) Implement Preprocessor #include with StringBuilder

Demonstrates how to implement #include with a Chilkat StringBuilder.

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// First build a string that has a preprocessor include
Chilkat.StringBuilder sbSrc = new Chilkat.StringBuilder();
sbSrc.Append("1\r\n2\r\n3\r\n");
sbSrc.Append("#include <qa_data/txt/helloWorld.txt>\r\n");
sbSrc.Append("4\r\n5\r\n");

Debug.WriteLine(sbSrc.GetAsString());

// sbSrc contains:
// 	1
// 	2
// 	3
// 	#include <qa_data/txt/helloWorld.txt>
// 	4
// 	5

// The qa_data/txt/helloWorld.txt file contains "Hello World!"

string filePath = sbSrc.GetAfterBetween("#include","<",">");
if (sbSrc.LastMethodSuccess != true) {
    Debug.WriteLine("No #include's found.");
    return;
}

Debug.WriteLine("filePath: " + filePath);

// Load the contents of the filePath
Chilkat.StringBuilder sbIncludeFile = new Chilkat.StringBuilder();
sbIncludeFile.LoadFile(filePath,"utf-8");

// Replace the first occurrence of #include <...> line with the contents of the include file.
sbSrc.ReplaceAllBetween("#include",">",sbIncludeFile.GetAsString(),true);

Debug.WriteLine(sbSrc.GetAsString());

// sbSrce now contains:
// 	1
// 	2
// 	3
// 	Hello World!
// 	4
// 	5