What is used of System.Text.StringBuilder

Manish Singh

Hi........

Oues: Hello all of you now i am write a string based program but i am not understand What is used of System.Text.StringBuilder ? and please explain .....What the advantage of using System.Text.StringBuilder over System.String?

2 Replies

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Vulpes15y ago
The StringBuilder class is particularly useful when:

1. You want to do a large number of string concatenations - StringBuilder.Append is much more efficient than the String.Concat method, the String.Format method or the '+' operator for this sort of work.

2. You need to pass an empty string buffer to an unmanaged function for it to return some result. The Platform Invoke mechanism has special support for the use of a StringBuilder in these circumstances because, for technical reasons, a normal String cannot be used.
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Satyapriya Nayak15y ago
Hi Manish,

The String object is immutable which means, every time you use any of the methods in the String class, you create a new string object in memory.

The StringBuilder class can be used when you want to modify a string without creating a new object. StringBuilder class is present in System.Text namespace where String class is present in System namespace
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Example for string builder class:
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using System.Text;
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    private void DeleteRecords(StringCollection sc)
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    {
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        con = new SqlConnection(connStr);
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        StringBuilder sb = new StringBuilder(string.Empty);
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        foreach (string item in sc)
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        {
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            const string sqlStatement = "DELETE FROM employee WHERE EmpId";
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            sb.AppendFormat("{0}='{1}'; ", sqlStatement, item);
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        }
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        try
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        {
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            con.Open();
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            SqlCommand cmd = new SqlCommand(sb.ToString(), con);
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            cmd.CommandType = CommandType.Text;
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            cmd.ExecuteNonQuery();
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        }
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        catch (System.Data.SqlClient.SqlException ex)
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        {
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            string msg = "Deletion Error:";
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            msg += ex.Message;
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            throw new Exception(msg);
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        }
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        finally
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        {
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            con.Close();
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        }
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    }
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Advantage
StringBuilder is more efficient in the cases, where a lot of manipulation is done to the text. Strings are immutable, so each time it's being operated on, a new instance is created.

Thanks
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