Use string.Format

• Jun 26, 2019
• 2 minutes to read

Purpose

Converts a composed string expression into a single string.Format call. The use of formatted strings increases code readability and allows you to customize value formatting.

Availability

Available when the caret is on a composed string expression or interpolated string.

Usage

1. Place the caret on a composed string expression.

   NOTE

   The blinking cursor shows the caret's position at which the Refactoring is available.

   C#

   for (int i = 2; i < 10; i++) {
       for (int j = i; j < 10; j++) {
           Console.WriteLine(│i + " * " + j + " = " + i * j);
       }
   }
   

   VB.NET

   For i As Integer = 2 To 9
       For j As Integer = i To 9
           Console.WriteLine(│i & " * " & j & " = " & i * j)
       Next j
   Next i
   

2. Use the Ctrl + . or Ctrl + ~ shortcut to invoke the Code Actions Menu.
3. Select Use string.Format from the menu.

After execution, the Refactoring replaces the composed string with the string.Format method call.

C#

for (int i = 2; i < 10; i++) {
    for (int j = i; j < 10; j++) {
        Console.WriteLine(string.Format("{0} * {1} = {2}", i, j, i * j));
    }
}

VB.NET

For i As Integer = 2 To 9
    For j As Integer = i To 9
        Console.WriteLine(String.Format("{0} * {1} = {2}", i, j, i * j))
    Next j
Next i