C# 如何删除字符串中的前两个和最后两个字符？
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How to remove first two and last two chars in a string?
提问by Sergio Tapia
Is there an easy way to remove the first 2 and last 2 chars in a string?
有没有一种简单的方法可以删除字符串中的前 2 个和最后 2 个字符？
I have this string:
我有这个字符串：
\nTESTSTRING\n
How could I easily delete them?
我怎样才能轻松删除它们？
采纳答案by Manu
str = str.Substring(2,str.Length-4)
Of course you must test that the string contains more than 4 chars before doing this. Also in your case it seems that \n is a single newline character. If all you want to do is remove leading and trailing whitespaces, you should use
当然，在执行此操作之前，您必须测试字符串是否包含 4 个以上的字符。同样在您的情况下， \n 似乎是一个换行符。如果您只想删除前导和尾随空格，则应使用
str.Trim()
as suggested by Charles
正如查尔斯所建议的
回答by Chuck Conway
Did you try:
你试过了吗：
myString.Trim();
回答by André Pena
myString = myString.SubString(2, myString.Length - 4);
回答by cdmckay
// Test string
var str = "\nTESTSTRING\n";
// Number of characters to remove on each end
var n = 2;
// Slimmed string
string slimmed;
if (str.Length > n * 2)
slimmed = str.Substring(n, str.Length - (n * 2));
else
slimmed = string.Empty;
// slimmed = "ESTSTRIN"
回答by Ricardo Lacerda Castelo Branco
Papuccino1,
帕布奇诺1,
If you create an extension method like this:
如果您创建这样的扩展方法：
public static class StringEnumerator {
public static IEnumerable<String> GetLines(this String source) {
String line = String.Empty;
StringReader stringReader = new StringReader(source);
while ((line = stringReader.ReadLine()) != null) {
if (!String.IsNullOrEmpty(line)) {
yield return line;
}
}
}
}
your code will be simplified and will be safer (not depending on dangerous index):
您的代码将被简化并且更安全（不依赖于危险指数）：
class Program {
static void Main(string[] args) {
String someText = "\nTESTSTRING\n";
String firstLine = someText.GetLines().First();
}
}
I hope this helps,
我希望这有帮助，
Ricardo Lacerda Castelo Branco
里卡多·拉塞尔达 Castelo Branco
回答by Muhammad Hussain
public string RemoveFirstCharFromString(string Text)
{
string[] arr1 = new string[] { "The ", "A " };
string Original = Text.ToLower();
if (Text.Length > 4)
{
foreach (string match in arr1)
{
if (Original.StartsWith(match.ToLower()))
{
//Original = Original.Replace(match.ToLower(), "").TrimStart();
Original = Original.Replace(Original.Substring(0, match.Length), "").TrimStart();
return Original;
}
}
}
return Original;
}
回答by Muhammad Hussain
string Origional = TextBox1.Text.Replace(TextBox1.Text.Substring(0, 2), "");
Origional += Origional.Replace(Origional.Substring((Origional.Length - 2), 2), "");
回答by user2248133
Its Simple with Substringand Removemethods, as detailed in this link:
其简单的方法Substring和Remove方法，详见此链接：
string mystring = "122014";
mystring = mystring.Substring(mystring.Length - 4);
Response.Write(mystring.ToString());
//output:2014
mystring = "122014";
string sub = mystring.Remove(mystring.Length - 4);
Response.Write("<br>");
Response.Write(sub.ToString());
//output: 12
