Windows Dev Center

Char.IsControl Method (Char)

Indicates whether the specified Unicode character is categorized as a control character.

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

public static bool IsControl(
	char c
)

Parameters

c
Type: System.Char
A Unicode character.

Return Value

Type: System.Boolean
true if c is a control character; otherwise, false.

Control characters are non-printing and formatting characters, such as ACK, BEL, CR, FF, LF, and VT. The Unicode standard assigns the following code points to control characters: from \U0000 to \U001F, \U007F, and from \U0080 to \U009F. According to the Unicode standard, these values are to be interpreted as control characters unless their use is otherwise defined by an application. Valid control characters are members of the UnicodeCategory.Control category.

The following example lists the Unicode code point of each of the control characters.


using System;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      int charsWritten = 0;

      for (int ctr = 0x00; ctr <= 0xFFFF; ctr++)
      {
         char ch = Convert.ToChar(ctr);
         if (char.IsControl(ch))
         {
            outputBlock.Text += String.Format(@"\U{0:X4}    ", ctr);
            charsWritten++;
            if (charsWritten % 6 == 0)
               outputBlock.Text += "\n";
         }
      }
   }
}
// The example displays the following output:
//       \U0000    \U0001    \U0002    \U0003    \U0004    \U0005
//       \U0006    \U0007    \U0008    \U0009    \U000A    \U000B
//       \U000C    \U000D    \U000E    \U000F    \U0010    \U0011
//       \U0012    \U0013    \U0014    \U0015    \U0016    \U0017
//       \U0018    \U0019    \U001A    \U001B    \U001C    \U001D
//       \U001E    \U001F    \U007F    \U0080    \U0081    \U0082
//       \U0083    \U0084    \U0085    \U0086    \U0087    \U0088
//       \U0089    \U008A    \U008B    \U008C    \U008D    \U008E
//       \U008F    \U0090    \U0091    \U0092    \U0093    \U0094
//       \U0095    \U0096    \U0097    \U0098    \U0099    \U009A
//       \U009B    \U009C    \U009D    \U009E    \U009F


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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