C# 比较忽略换行符和空格的两个字符串
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Compare two strings ignoring new line characters and white spaces
提问by Daniel Pe?alba
I need to compare two strings ignoring whitespaces and newline characters, so the following strings should be equal:
我需要比较忽略空格和换行符的两个字符串，因此以下字符串应该相等：
"Initial directory structure.\r\n \r\n The directory tree has been changed"
"Initial directory structure.\n\nThe directory tree has been changed"
Someone knows how to implement it? Thanks in advance.
有人知道如何实施吗？提前致谢。
采纳答案by jim tollan
how about:
怎么样：
string stringOne = "ThE OlYmpics 2012!";
string stringTwo = "THe\r\n OlympiCs 2012!";
string fixedStringOne = Regex.Replace(stringOne, @"\s+", String.Empty);
string fixedStringTwo = Regex.Replace(stringTwo, @"\s+", String.Empty);
bool isEqual = String.Equals(fixedStringOne, fixedStringTwo,
StringComparison.OrdinalIgnoreCase);
Console.WriteLine(isEqual);
Console.Read();
回答by musefan
How about:
怎么样：
string compareA = a.Replace(Environment.NewLine, "").Replace(" ", "");
string compareB = b.Replace(Environment.NewLine, "").Replace(" ", "");
Then you can compare both.
然后你可以比较两者。
Maybe throw that in to a helper function:
也许把它扔到一个辅助函数中：
public bool SpacelessCompare(string a, string b){
string compareA = a.Replace(Environment.NewLine, "").Replace(" ", "");
string compareB = b.Replace(Environment.NewLine, "").Replace(" ", "");
return compareA == compareB;
}
回答by Joshua
copy the string then
然后复制字符串
xyz.Replace(" ", string.Empty);
xyz.Replace("\n", string.Empty);
回答by x06265616e
myString = myString.Replace("", "Initial directory structure.\r\n \r\n The directory tree has been changed");
Now just check if they are equal.
现在只需检查它们是否相等。
String.Compare(myString, "Initial directory structure.The directory tree has been changed")
回答by Dan Bailiff
An alternative approach is to use the CompareOptions of String.Compare.
另一种方法是使用 String.Compare 的 CompareOptions。
CompareOptions.IgnoreSymbols
CompareOptions.IgnoreSymbols
Indicates that the string comparison must ignore symbols, such as white-space characters, punctuation, currency symbols, the percent sign, mathematical symbols, the ampersand, and so on.
指示字符串比较必须忽略符号，例如空格字符、标点符号、货币符号、百分号、数学符号、与号等。
String.Compare("foo\r\n ", "foo", CompareOptions.IgnoreSymbols);
https://docs.microsoft.com/en-us/dotnet/api/system.globalization.compareoptions
https://docs.microsoft.com/en-us/dotnet/api/system.globalization.compareoptions
回答by prussaq
Another variant, flexible (adding any skip chars), no modifying original strings or creating new ones.
另一个变体，灵活（添加任何跳过字符），无需修改原始字符串或创建新字符串。
string str = "Hel lo world!";
string rts = "Hello\n world!";
char[] skips = { ' ', '\n' };
if (CompareExcept(str, rts, skips))
Console.WriteLine("The strings are equal.");
else
Console.WriteLine("The strings are not equal.");
static bool CompareExcept(string str, string rts, char[] skips)
{
if (str == null && rts == null) return true;
if (str == null || rts == null) return false;
var strReader = new StringReader(str);
var rtsReader = new StringReader(rts);
char nonchar = char.MaxValue;
Predicate<char> skiper = delegate (char chr)
{
foreach (var skp in skips)
{
if (skp == chr) return true;
}
return false;
};
while (true)
{
char a = strReader.GetCharExcept(skiper);
char b = rtsReader.GetCharExcept(skiper);
if (a == b)
{
if (a == nonchar) return true;
else continue;
}
else return false;
}
}
class StringReader : System.IO.StringReader
{
public StringReader(string str) : base(str) { }
public char GetCharExcept(Predicate<char> compare)
{
char ch;
while (compare(ch = (char)Read())) { }
return ch;
}
}
