[英]IFormattable.ToString not working as expected for Hexadecimal formatting
String.Format and IFormattable.ToString(format, value) provides different result when trying to format to hexadecimal. String.Format 和 IFormattable.ToString(format, value) 在尝试格式化为十六进制时提供不同的结果。 How to get correct results when using IFormattable.ToString(format, value)
使用 IFormattable.ToString(format, value) 时如何获得正确的结果
string format = "0x{0:X4}";
Console.WriteLine(string.Format(format, 255)); //prints- 0x00FF
IFormattable formattableValue = (IFormattable)255;
Console.WriteLine(formattableValue.ToString(format, null)); //prints- 25x{5:X4}
The format of the formatting string is different for string.Format()
and for ToString()
. string.Format()
和ToString()
的格式化字符串的格式不同。 In particular, string.Format()
allows for other text around the format, while IFormattable.ToString()
only allows the format specifier for the text itself.特别是,
string.Format()
允许格式周围的其他文本,而IFormattable.ToString()
只允许文本本身的格式说明符。
In your example, the format string "0x{0:X4}"
is being treated as the whole format specifier for the value 255. The 0
are placeholders for digits, and the rest is just extra character literals.在您的示例中,格式字符串
"0x{0:X4}"
被视为值 255 的整个格式说明符0
是数字的占位符,其余的只是额外的字符文字。
If you want IFormattable.ToString()
to output the same as string.Format()
you have to use it in an equivalent way:如果您希望
IFormattable.ToString()
输出与string.Format()
相同的输出,则必须以等效的方式使用它:
"0x" + formattableValue.ToString("X4", null);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.