dankemper.net 2.0 :: How to Write a DLL Using C#

How to Write a DLL Using C#

The code for the dll shown below in the text area is all you need to create the dll, provided the C# compiler is at your disposal. The "doSort" dll implements the insertion sort algorithm. I used Visual Studio 2005 to create a console application to call the insertionSort method inside the dll, but this is not necessary as long as you create a reference to the dll using csc from the command line. The insertionSort method should be called with a string as its argument. This string should be a delimited list of numbers with no spaces. Please check back for more information on using this with mono, the open source .NET Framework.

// example compilation from the command line:
	// 
	// C:\cSharpSort>csc /t:library /out:doSort.dll doSort.cs
	//

// example usage in a console application:
	//
	// string listToSort = "";
	// Random r = new Random();
	//
	// for (int l=0; l<100; l++)
	// {
	// 	double myDouble = r.NextDouble();
	// 	if (l == 99)
	// 		listToSort += myDouble.ToString();
	// 	else 
	//		listToSort += myDouble.ToString() + ";";
	// }
	//		
	// string[] sortedList = doSort.insertionSort(listToSort);
	// foreach (string number in sortedList)
	// {
	// 	System.Console.WriteLine(number);
	// }
	//	
	// keep the window open for 30 seconds to view results
	// 
	// System.Threading.Thread.Sleep(30000); 
	//

// the doSort DLL code
	//
	using System;
	using System.IO;

public class doSort {

private static char delimiter;

doSort() {
		}	
	
		public static string[] insertionSort(string nums)
		{
			if ((nums.IndexOf(";")) > -1)
			{
				delimiter=';';
			}
			else if ((nums.IndexOf(":")) > -1)
			{
				delimiter=':';
			}
			else if ((nums.IndexOf("-")) > -1)
			{
				delimiter='-';
			}
			else if ((nums.IndexOf("~")) > -1)
			{
				delimiter='~';
			}
			else 
			{
				delimiter=',';
			}
		
			// System.Windows.Forms.MessageBox.Show("Delimiter is: " + delimiter.ToString());

string []toSort;
			toSort = nums.Split(delimiter);
			double []A = new double[toSort.Length];
		
			// convert the string array to a numeric array
			//
			int indexA=0;
			foreach (string str in toSort)
			{
				// System.Windows.Forms.MessageBox.Show(str);
				double dblStr = Convert.ToDouble(str);
				A[indexA] = dblStr;
				indexA++;
			}
		
			for (int j=1; j<A.Length; j++) // j=1 for 0 based array
			{
				double key = A[j];
				int i = j-1;
			
				while((i>=0) && (A[i] > key)) // i>=0 for 0 based array
				{
					// perform the swap
					//
					double tmp = A[i+1];
					A[i+1] = A[i];
					A[i] = tmp;
					i--;
				}
			}

string []sortedArray = new string[A.Length];
			int indexSortedArray = 0;
			foreach (double dbl in A)
			{
				string strDbl = Convert.ToString(dbl);
				sortedArray[indexSortedArray] = strDbl;
				indexSortedArray++;
			}

return sortedArray;		
		
		}

}