WriteLine Method (String, Object)

Console.WriteLine Method (String, Object)

 

Writes the text representation of the specified object, followed by the current line terminator, to the standard output stream using the specified format information.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

<HostProtectionAttribute(SecurityAction.LinkDemand, UI := True)>
Public Shared Sub WriteLine (
	format As String,
	arg0 As Object
)

Parameters

format
Type: System.String

A composite format string (see Remarks).

arg0
Type: System.Object

An object to write using format.

Exception Condition
IOException

An I/O error occurred.

ArgumentNullException

format is null.

FormatException

The format specification in format is invalid.

This method uses the composite formatting feature of the .NET Framework to convert the value of an object to its text representation and embed that representation in a string. The resulting string is written to the output stream.

The format parameter consists of zero or more runs of text intermixed with zero or more indexed placeholders, called format items, that correspond to an object in the parameter list of this method. The formatting process replaces each format item with the text representation of the value of the corresponding object.

The syntax of a format item is {index[,alignment][:formatString]}, which specifies a mandatory index, the optional length and alignment of the formatted text, and an optional string of format specifier characters that govern how the value of the corresponding object is formatted.

The .NET Framework provides extensive formatting support, which is described in greater detail in the following formatting topics.

For more information about the line terminator, see the Remarks section of the WriteLine method that takes no parameters.

The following example calls the WriteLine(String, Object) method to display five randomly generated Boolean values.

Module Example
   Public Sub Main()
      Dim rnd As New Random()
      ' Generate five random Boolean values.
      For ctr As Integer = 1 To 5
         Dim bool As Boolean = Convert.ToBoolean(rnd.Next(0, 2))
         Console.WriteLine("True or False: {0}", bool)
      Next
   End Sub
End Module
' The example displays the following output:
'       True or False: False
'       True or False: True
'       True or False: False
'       True or False: False
'       True or False: True

The following example calls the WriteLine(String, Object) method to display the current date. Note that the format item in the format argument uses the "D" standard date and time format string to display the date in the long date format of the current culture.

Module Example
   Public Sub Main()
      Console.WriteLine("Today's date: {0:D}", DateTime.Now)
   End Sub
End Module
' The example displays output like the following:
'       Today's date: Friday, April 1, 2016

UIPermission

for modifying safe top-level windows and subwindows. Associated enumeration: UIPermissionWindow.SafeTopLevelWindows

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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