Create a string and append text to it

Question

Funny, I had a textbox and I could append strings to it.

But now I create a string like this:

    Dim str As String = New String("") 

And I want to append to it other strings. But there is no function for doing so. What am I doing wrong?

Answer 1

Concatenate with & operator

Dim str as String  'no need to create a string instance str = "Hello " & "World" 

You can concate with the + operator as well but you can get yourself into trouble when trying to concatenate numbers.

Concatenate with String.Concat()

str = String.Concat("Hello ", "World") 

Useful when concatenating array of strings

StringBuilder.Append()

When concatenating large amounts of strings use StringBuilder, it will result in much better performance.

    Dim sb as new System.Text.StringBuilder()     str = sb.Append("Hello").Append(" ").Append("World").ToString() 

Strings in .NET are immutable, resulting in a new String object being instantiated for every concatenation as well a garbage collection thereof.

Answer 2

Another way to do this is to add the new characters to the string as follows:

Dim str As String  str = "" 

To append text to your string this way:

str = str & "and this is more text"