Use String.IsNullOrEmpty

• Aug 03, 2020
• 2 minutes to read

Purpose

Converts an expression that checks whether a string is null or empty to the String.IsNullOrEmpty method call. This shortens the code and increases code performance.

Availability

Available when the cursor is within an expression checking whether a string is null or empty.

Usage

1. Place the caret on an expression against a string checking whether it is null or empty.

   Note

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

   C#

   public bool AddRecord(string name, object data) {
       if (│name == null || name == String.Empty || data == null)
           return false;
   
       //... 
       return true;
   }
   

   VB.NET

   Public Function AddRecord(ByVal name As String,
                             ByVal data As Object) As Boolean
       If │name Is Nothing OrElse name = String.Empty OrElse
           data Is Nothing Then
           Return False
       End If
   
       '... 
       Return True
   End Function
   

2. Press the Ctrl + . or Ctrl + ~ shortcut to invoke the Code Actions menu.
3. Select Use String.IsNullOrEmpty from the menu.

After execution, the Refactoring replaces the logical expression with the String.IsNullOrEmpty method call.

C#

public bool AddRecord(string name, object data) {
    if (String.IsNullOrEmpty(name) || data == null)
        return false;

    //... 
    return true;
}

VB.NET

Public Function AddRecord(ByVal name As String,
                          ByVal data As Object) As Boolean
    If String.IsNullOrEmpty(name) OrElse
        data Is Nothing Then
        Return False
    End If

    '... 
    Return True
End Function