[点晴永久免费OA][C#]自定义编写函数URLDecode()
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初用System.Web.HttpUtility.UrlDecode()这个函数，但根据用户环境crash场景，发现有.net framework库不全情况，即找不到System.Web.dll这个程序集。
居然有此等事情！自写代码解析喽，在网上下载得System.Web源代码，抽离所需函数，满足需求，项目可以舍弃对System.Web的引用：
public static string UrlDecode(string str)
{
return UrlDecode(str, Encoding.UTF8);
}
static void WriteCharBytes(IList buf, char ch, Encoding e)
{
if (ch > 255)
{
foreach (byte b in e.GetBytes(new char[] { ch })) { buf.Add(b); }
}
else
{ buf.Add((byte)ch); }
}
static int GetInt(byte b)
{
char c = (char)b;
if (c >= '0' && c <= '9') { return c - '0'; }
if (c >= 'a' && c <= 'f') { return c - 'a' + 10; }
if (c >= 'A' && c <= 'F') { return c - 'A' + 10; }
return -1;
}
static int GetChar(string str, int offset, int length)
{
int val = 0;
int end = length + offset;
for (int i = offset; i < end; i++)
{
char c = str[i];
if (c > 127) { return -1; }
int current = GetInt((byte)c);
if (current == -1)
return -1;
val = (val << 4) + current;
}
return val;
}
public static string UrlDecode(string s, Encoding e)
{
if (null == s) { return null; }
if (s.IndexOf('%') == -1 && s.IndexOf('+') == -1) { return s; }
if (e == null) { e = Encoding.UTF8; }
long len = s.Length;
var bytes = new List<byte>();
int xchar;
char ch;
for (int i = 0; i < len; i++)
{
ch = s[i];
if (ch == '%' && i + 2 < len && s[i + 1] != '%')
{
if (s[i + 1] == 'u' && i + 5 < len)
{
// unicode hex sequence
xchar = GetChar(s, i + 2, 4);
if (xchar != -1)
{
WriteCharBytes(bytes, (char)xchar, e);
i += 5;
}
else
WriteCharBytes(bytes, '%', e);
}
else if ((xchar = GetChar(s, i + 1, 2)) != -1)
{
WriteCharBytes(bytes, (char)xchar, e);
i += 2;
}
else
{
WriteCharBytes(bytes, '%', e);
}
continue;
}
if (ch == '+')
{ WriteCharBytes(bytes, ' ', e); }
else
{ WriteCharBytes(bytes, ch, e); }
}
byte[] buf = bytes.ToArray();
bytes = null;
return e.GetString(buf);
} 相关教程： 该文章在 2022/7/27 11:15:34 编辑过 |
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