c# – 如何使用单字节字符编码？

在this wiki page我发现以下应该是单字节字符集：

> ISO 8859
> ISO / IEC 646(我找不到这个here)
>各种Microsoft / IBM代码页

但是当我在这些字符集上调用Encoding.GetMaxByteCount(1)时,它总是返回2.

我还尝试了其他各种编码(例如IBM437),但GetMaxByteCount也为其他字符集返回2.

方法Endoding.IsSingleByte似乎不可靠according to this

You should be careful in what your application does with the value for
IsSingleByte. An assumption of how an Encoding will proceed may still
be wrong. For example,Windows-1252 has a value of true for
Encoding.IsSingleByte,but Encoding.GetMaxByteCount(1) returns 2. This
is because the method considers potential leftover surrogates from a
previous decoder operation.

此外,方法Encoding.GetMaxByteCount也有一些相同的问题according to this

Note that GetMaxByteCount considers potential leftover surrogates from
a previous decoder operation. Because of the decoder,passing a value
of 1 to the method retrieves 2 for a single-byte encoding,such as
ASCII. Your application should use the IsSingleByte property if this
information is necessary.

因此,我不知道如何使用.

Further reading.