I'm trying to append text to a large amount of strings (in the thousands), and also do some other string manipulations.
However, I have about 60 lines of if/else and string appending and it takes several minutes to go through so many lines of text.
It does several checks, but the main part of it uses:
newstring += appendText.Text + ' ' + inputTextBox.Lines[i];
Is there a better way to do this that makes it faster?
You are thinking correctly, appending text using plus operator is not optimal. Use StringBuilder for this, especially if conditionals are used:
(code from link above)
StringBuilder sb = new StringBuilder();
sb.Append("This is a sentence.");
for (int ctr = 0; ctr <= 10; ctr++) {
sb.Append("This is an additional sentence.");
}
Than call sb.ToString(); to show full string.
Note: There are at least 6 ways to concatenate a string in c# (all examples produce "a b"):
'+' operator: use for constant strings, when it makes visual sense in code
string interpolation (.net 4.6 and newer): var b = "b"; $"a {b}"
string.Concat: string.Concat("a", " b")
string.Format: string.Format("{0} b", "a")
string[] arr = { "a", "b" }; string.Join(" ", arr);
Usually, if you use .net 4.6 you will want to use string interpolation for shorter ones, and StringBuilder for longer. Prior to .net 4.6 insted of interpolation, use string.Format().
