C# 二进制字符串转整数
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Binary String to Integer
提问by eric
I have a binary string, entered by the user, which I need to convert to an integer.
我有一个由用户输入的二进制字符串，我需要将其转换为整数。
At first I naivly used this simple line:
起初我天真地使用了这个简单的行：
Convert.ToInt32("11011",2);
Unfortunately this throws an exception if the user enters the integer directly.
不幸的是，如果用户直接输入整数，这将引发异常。
Convert.ToInt32("123",2); // throws Exception
How can I make sure that the string entered by the user actually is a binary string?
如何确保用户输入的字符串实际上是二进制字符串？
- try..catch....but that's just too ugly.
- something like 'Int32.TryParse' maybe.
- try..catch.. 但这太丑了。
- 也许像'Int32.TryParse'这样的东西。
Thanks
谢谢
采纳答案by Marc Gravell
You could use a Regexto check that it is "^[01]+$" (or better, "^[01]{1,32}$"), and thenuse Convert?
您可以使用 aRegex来检查它是否是“^[01]+$”（或者更好，“^[01]{1,32}$”），然后使用Convert?
of course, exceptions are unlikelyto be a huge problem anyway! Inelegant? maybe. But they work.
当然，无论如何，异常不太可能成为一个大问题！不雅？也许。但他们工作。
Example (formatted for vertical space):
示例（格式化为垂直空间）：
static readonly Regex binary = new Regex("^[01]{1,32}$", RegexOptions.Compiled);
static void Main() {
Test("");
Test("01101");
Test("123");
Test("0110101101010110101010101010001010100011010100101010");
}
static void Test(string s) {
if (binary.IsMatch(s)) {
Console.WriteLine(Convert.ToInt32(s, 2));
} else {
Console.WriteLine("invalid: " + s);
}
}
回答by eric
Thanks for the great and incredibly fast answer!
感谢您提供出色且令人难以置信的快速答复！
Unfortunately, my requirements changed. Now the user can pretty much enter any format. Binary, Decimal, Hex. So I decided try - catch just provides the simplest and cleanest solution.
不幸的是，我的要求发生了变化。现在用户几乎可以输入任何格式。二进制、十进制、十六进制。所以我决定尝试 - catch 只是提供最简单和最干净的解决方案。
So just for good measure I am posting the code I am using now. I think it is pretty clear and even somewhat elegant, or so I think^^.
所以只是为了更好的衡量，我发布了我现在正在使用的代码。我认为它很清楚，甚至有点优雅，或者我认为^^。
switch (format)
{
case VariableFormat.Binary:
try
{
result = Convert.ToInt64(value, 2)
}
catch
{
// error handling
}
break;
case VariableFormat.Decimal:
try
{
result = Convert.ToInt64(value, 10)
}
catch
{
// error handling
}
break;
case VariableFormat.Hexadecimal:
try
{
result = Convert.ToInt64(value, 16)
}
catch
{
// error handling
}
break;
}
So thanks for encouraging me to use try - catch, I think it really improved the readibility of my code.
所以感谢鼓励我使用 try - catch，我认为它确实提高了我代码的可读性。
Thanks
谢谢
