UTF7Encoding.GetCharCount Method (Byte[], Int32, Int32)

 
System_CAPS_noteNote

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Calculates the number of characters produced by decoding a sequence of bytes from the specified byte array.

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

public override int GetCharCount(
	byte[] bytes,
	int index,
	int count
)

Parameters

bytes
Type: System.Byte[]

The byte array containing the sequence of bytes to decode.

index
Type: System.Int32

The index of the first byte to decode.

count
Type: System.Int32

The number of bytes to decode.

Return Value

Type: System.Int32

The number of characters produced by decoding the specified sequence of bytes.

Exception Condition
ArgumentNullException

bytes is null (Nothing).

ArgumentOutOfRangeException

index or count is less than zero.

-or-

index and count do not denote a valid range in bytes.

-or-

The resulting number of characters is greater than the maximum number that can be returned as an int.

DecoderFallbackException

A fallback occurred (see Character Encoding in the .NET Framework for complete explanation)

-and-

DecoderFallback is set to DecoderExceptionFallback.

To calculate the exact array size required by GetChars to store the resulting characters, use GetCharCount. To calculate the maximum array size, the application should use GetMaxCharCount. The GetCharCount method generally allows allocation of less memory, while the GetMaxCharCount method generally executes faster.

The following code example demonstrates how to use the GetCharCount method to return the number of characters produced by decoding a range of elements in a byte array.

using System;
using System.Text;

class UnicodeEncodingExample {
    public static void Main() {
        Byte[] bytes = new Byte[] {
            85, 0, 110, 0, 105, 0, 99, 0, 111, 0, 100, 0, 101, 0
        };

        UnicodeEncoding Unicode = new UnicodeEncoding();
        int charCount = Unicode.GetCharCount(bytes, 2, 8);
        Console.WriteLine(
            "{0} characters needed to decode bytes.", charCount
        );
    }
}

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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