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

User · Answer

Use the string concatenation operator   Dim str As String   New String      amp   some other string    Strings in  NET are immutable and thus there exist no concept of appending strings  All string modifications causes a new string to be created and returned    This obviously cause a terrible performance  In common everyday code this isn t an issue  but if you re doing intensive string operations in which time is of the essence then you will benefit from looking into the StringBuilder class  It allow you to queue appends  Once you re done appending you can ask it to actually perform all the queued operations   See  How to  Concatenate Multiple Strings  for more information on both methods

User · Answer

Concatenate with  amp  operator  Dim str as String   no need to create a string instance str    Hello    amp   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

User · Answer

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  amp   and this is more text

[vb.net] Create a string and append text to it

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