About Exception:
An invalid XML character (Unicode: 0xb) was found in the element content of the document.
原因:
從異常來看,很明顯是因為字節數組中存在 Unicode: 0xb,而這個字節在Xml中被認為是非法字符。
對于一些經過編碼或加、解密的字符串中,很容易會出現這個 0xb,
特別是在加、解密中,經常會涉及到字符填充,而填充物通常是 0xb,
需對于0x00-0x20 都會引起一定的問題,又因為這些字符不可見,因此用通常的編輯器進行編輯的時候找不到問題所在。
而在轉成String后也覺察不到任何異常。
所以在轉成XML格式時要對字符串進行檢測:
* Verify that no character has a hex value greater than 0xFFFD, or less than 0x20.
* Check that the character is not equal to the tab ("t), the newline ("n), the carriage return ("r), or is an invalid XML character below the range of 0x20. If any of these characters occur, an exception is thrown.
pubic String CheckUnicodeString(String value)
{
char xmlChar = value.toCharArray();
for (int i=0; i < xmlChar.Length; ++i) {
if (xmlChar[i] > 0xFFFD)
{
throw new Exception("Invalid Unicode");
//或者直接替換掉0xb
xmlChar[i] =' ';// 用空格替換
}
else if (xmlChar[i] < 0x20 && xmlChar[i] != 't' & xmlChar[i] != 'n' & xmlChar[i] != 'r')
{
throw new Exception("Invalid Xml Characters");
//或者直接替換掉0xb
xmlChar[i] =' ' ;// 用空格替換
}
return new String( xmlChar );
}