String Constructor (SByte*, Int32, Int32, Encoding)

[CLSCompliantAttribute(false)] 
public String (
	sbyte* value,
	int startIndex,
	int length,
	Encoding enc
)

J# does not support APIs that consume or return unsafe types.

JScript does not support APIs that consume or return unsafe types.

Parameters

value

A pointer to an array of 8-bit signed integers.

startIndex

The starting position within value.

length

The number of characters within value to use.

enc

An Encoding object that specifies how the array referenced by value is encoded. If enc is a null reference (Nothing in Visual Basic), ANSI encoding is assumed.

The value parameter is assumed to point to an array representing a string encoded as specified by enc.

If length is zero, the new instance is initialized to the empty string ("").

This constructor processes characters from value starting at startIndex and ending at (startIndex + length - 1).

If the specified range is outside of the memory allocated for the sequence of characters, the behavior of this constructor is system dependent. For example, such a situation might cause an access violation.

In C#, this constructor is defined only in the context of unsafe code.

The following simple code example demonstrates how you can create an instance of a UTF-8 String with this constructor.

unsafe
{
    String utfeightstring = null;
    sbyte [] asciiChars = new sbyte[] { 0x51,0x52,0x53,0x54,0x54,0x56 };
    UTF8Encoding encoding = new UTF8Encoding(true, true);

    // Instruct the Garbage Collector not to move the memory
    fixed(sbyte* pAsciiChars = asciiChars)
    {
        utfeightstring = new String(pAsciiChars,0,asciiChars.Length,encoding);
    }
    Console.WriteLine("The UTF8 String is " + utfeightstring ); // prints "QRSTTV"
}

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework