ASCIIEncoding.GetCharCount Method

Definition

Calculates the number of characters produced by decoding a sequence of bytes.

Overloads

GetCharCount(Byte*, Int32)

Calculates the number of characters produced by decoding a sequence of bytes starting at the specified byte pointer.

GetCharCount(Byte[], Int32, Int32)

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

GetCharCount(ReadOnlySpan<Byte>)

Calculates the number of characters produced by decoding the specified byte span.

GetCharCount(Byte*, Int32)

Source:
ASCIIEncoding.cs
Source:
ASCIIEncoding.cs
Source:
ASCIIEncoding.cs

Important

This API is not CLS-compliant.

CLS-compliant alternative
System.Text.ASCIIEncoding.GetCharCount(Byte[], Int32, Int32)

Calculates the number of characters produced by decoding a sequence of bytes starting at the specified byte pointer.

[System.CLSCompliant(false)]
[System.Security.SecurityCritical]
public override int GetCharCount (byte* bytes, int count);
[System.CLSCompliant(false)]
public override int GetCharCount (byte* bytes, int count);
[System.CLSCompliant(false)]
[System.Runtime.InteropServices.ComVisible(false)]
public override int GetCharCount (byte* bytes, int count);
[System.CLSCompliant(false)]
[System.Security.SecurityCritical]
[System.Runtime.InteropServices.ComVisible(false)]
public override int GetCharCount (byte* bytes, int count);

Parameters

bytes
Byte*

A pointer to the first byte to decode.

count
Int32

The number of bytes to decode.

Returns

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

Attributes

Exceptions

bytes is null.

count is less than zero.

-or-

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

A fallback occurred (for more information, see Character Encoding in .NET)

-and-

DecoderFallback is set to DecoderExceptionFallback.

Remarks

To calculate the exact array size required by GetChars to store the resulting characters, the application uses 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.

See also

Applies to

.NET 9 a ďalšie verzie
Produkt Verzie
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.3, 1.4, 1.6, 2.0, 2.1
UWP 10.0

GetCharCount(Byte[], Int32, Int32)

Source:
ASCIIEncoding.cs
Source:
ASCIIEncoding.cs
Source:
ASCIIEncoding.cs

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

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

Parameters

bytes
Byte[]

The byte array containing the sequence of bytes to decode.

index
Int32

The index of the first byte to decode.

count
Int32

The number of bytes to decode.

Returns

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

Exceptions

bytes is null.

index or count is less than zero.

-or-

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

-or-

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

A fallback occurred (for more information, see Character Encoding in .NET)

-and-

DecoderFallback is set to DecoderExceptionFallback.

Examples

The following 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 ASCIIEncodingExample {
    public static void Main() {
        Byte[] bytes = new Byte[] {
             65,  83,  67,  73,  73,  32,  69,
            110,  99, 111, 100, 105, 110, 103,
             32,  69, 120,  97, 109, 112, 108, 101
        };

        ASCIIEncoding ascii = new ASCIIEncoding();
        int charCount = ascii.GetCharCount(bytes, 6, 8);
        Console.WriteLine(
            "{0} characters needed to decode bytes.", charCount
        );
    }
}

Remarks

To calculate the exact array size required by GetChars to store the resulting characters, the application uses 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.

See also

Applies to

.NET 9 a ďalšie verzie
Produkt Verzie
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.3, 1.4, 1.6, 2.0, 2.1
UWP 10.0

GetCharCount(ReadOnlySpan<Byte>)

Source:
ASCIIEncoding.cs
Source:
ASCIIEncoding.cs
Source:
ASCIIEncoding.cs

Calculates the number of characters produced by decoding the specified byte span.

public override int GetCharCount (ReadOnlySpan<byte> bytes);

Parameters

bytes
ReadOnlySpan<Byte>

The span containing the set of bytes to decode.

Returns

The number of characters produced by decoding the specified byte span.

Remarks

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

Applies to

.NET 9 a ďalšie verzie
Produkt Verzie
.NET Core 3.0, Core 3.1, 5, 6, 7, 8, 9