C# `{0:X2}` 在此代码示例中是什么意思？
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What does `{0:X2}` mean in this code sample?
提问by GurdeepS
In the below code sample, what does {0:X2}mean? This is from the reflection section of the MCTS Application Development Foundation book (covering dynamic code, etc.).
在下面的代码示例中，是什么{0:X2}意思？这是来自 MCTS Application Development Foundation 书籍的反射部分（涵盖动态代码等）。
foreach(Byte b in body.GetILAsBodyArray())
{
Console.Write("{0:X2}", b);
}
采纳答案by BenAlabaster
This uses the same format as String.Format(). Check out the following reference:
这使用与 String.Format() 相同的格式。查看以下参考资料：
http://msdn.microsoft.com/en-us/library/fht0f5be.aspx
http://msdn.microsoft.com/en-us/library/fht0f5be.aspx
- X = Hexadecimal format
- 2 = 2 characters
- X = 十六进制格式
- 2 = 2 个字符
回答by Niels Gjeding Olsen
Beware the length specified is not respected if the number is too large to fit the length.
请注意，如果数字太大而不适合长度，则不遵守指定的长度。
long a = 123456789;
Console.Write("{0:X2}", a);
-> 75BCD15
This is especially important if you want to show negative hex numbers where all the high bits are set to 1's.
如果您想显示所有高位都设置为 1 的负十六进制数，这一点尤其重要。
long a = -1;
Console.Write("{0:X2}", a);
-> FFFFFFFFFFFFFFFF
