C # Custom string substitution Replace Replace method instance

This example describes the C # custom string substitution replace method. Share to everyone for your reference. The implementation method is as follows:

First, the question:

The first encounter is a title algorithm, which replaces some fragments of the original string with the specified new string fragment, for example, replacing the source string: CDE in ABCDEABCDFBCDEFG with 12345 to get the result string: AB12345ABCDFB12345FG, That is: ABCDEABCDFBCDEFG-AB12345ABCDFB12345FG.

Second, the realization method:

Obviously you can't use string. Replace method, you need to customize a method string Replace (String originalstring, String strtobereplaced, String strtoreplace), the following is my implementation code, Completed in half an hour, pass the debugging and the routine data test verification, still is a pass bar.

The code is as follows:

public static string Replace (String originalstring, String strtobereplaced, String strtoreplace)

{

string resultstring = null;

char[] Originalchararray = Originalstring.tochararray ();

char[] Strtobechararray = Strtobereplaced.tochararray ();

char[] Strtochararray = Strtoreplace.tochararray ();

list<char> newcharlist = new list<char> ();

for (int i = 0; i < Originalchararray.count (); i++)

{

if (originalchararray[i] = = Strtobechararra Y[0])

{

bool isreplace = false;

for (int j = 0; J < Strtobechararray.count (); j + +)

{

if (((i + j) < Originalchararray.count () )

&& (originalchararray[i + j] = = Strtobechararray[j]))

{

Isreplace = true;

}

Else

{

Isreplace = false;

break;

}

}

if (isreplace)

{

i + = Strtobechararray.count () –1;

for (int k = 0; k < Strtochararray.count (); k++)

{

Newcharlist.add (Strtochararray[k]);

}

}

Else

{

Newcharlist.add (Originalchararray[i]);

}

}

Else

{

Newcharlist.add (Originalchararray[i]);

}

}

resultstring = string. Join ("", newcharlist);

return resultstring;

}

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C # Custom string substitution Replace Replace method instance

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C # Custom string substitution Replace Replace method instance