C # obtain the number of bytes of a string

Convert a string to an ASCII array. If it is a Chinese byte code, it is ASCII code 63, that is "? ", So you can determine

Class StringOP

{

///

/// Obtain the actual length (in bytes) of the Chinese and English mixed string)

///

/// String to be retrieved

/// The actual length of the string (number of bytes)

Public int getStringLength (string str)

{

If (str. Equals (string. Empty ))

Return 0;

Int strlen = 0;

ASCIIEncoding strData = new ASCIIEncoding ();

// Convert a string to an ASCII encoded byte number

Byte [] strBytes = strData. GetBytes (str );

For (int I = 0; I <= strBytes. Length-1; I ++)

{

If (strBytes [I] = 63) // All Chinese characters are encoded as ASCII 63, that is "? "No.

Strlen ++;

Strlen ++;

}

Return strlen;

}

}

Class TestMain

{

Static void Main ()

{

StringOP sop = new StringOP ();

String str = "I Love China! I Love Beijing! ";

Int iLen = sop. getStringLength (str );

Console. WriteLine ("string" + str + "the number of bytes is:" + iLen. ToString ());

Console. ReadKey ();

}

}

Converts a string to a byte array encoded in Unicode and determines whether the second byte of each character is greater than 0 to calculate the number of bytes of the string.

Public static int bytelenght (string str)

{

// Convert a string to a byte array using Unicode encoding. It stores all strings (including English and Chinese) in 2 bytes.

Byte [] bytestr = System. Text. Encoding. Unicode. GetBytes (str );

Int j = 0;

For (int I = 0; I <bytestr. GetLength (0); I ++)

{

// The remainder 2 is obtained because all the elements in the byte array with double numbers are the first byte of the unicode character.

If (I % 2 = 0)

{

J ++;

}

Else

{

// The singular subscript is the 2nd bytes of the character. If the value of a single character's 2nd bytes is 0, the Unicode character is an English character. Otherwise, the Unicode character is a Chinese character.

If (bytestr [I]> 0)

{

J ++;

}

}

}

Return j;

}

Directly convert to bytecode to get the length:

Byte [] sarr = System. Text. Encoding. Default. GetBytes (s );

Int len = sarr. Length;