C# | Trim()方法
C# Trim()是一个字符串方法。此方法用于从当前字符串对象中移除所有前导和尾随空格字符。这个方法可以通过传递参数来重载。
语法:
public string Trim()
or
public string Trim (params char[] trimChars)
说明:第一种方法不取任何参数，第二种方法取 Unicode 字符数组或 null 作为参数。Null 是因为 params 关键字。微调()方法的类型是系统。弦。
注意:如果在公共字符串 Trim() 中没有传递参数，那么 Null、TAB、回车和空格将自动删除，如果它们存在于当前字符串对象中的话。如果任何参数将传递到 Trim()方法中，那么只有指定的字符(在 Trim()方法中作为参数传递)将从当前字符串对象中移除。如果参数列表中未指定空值、制表符、回车符和空格，它们将不会自动删除。
下面是演示上述方法的程序:
-
例 1: 程序演示公共字符串 Trim() 方法。Trim 方法从当前字符串对象中移除所有前导和尾随空格字符。当遇到非空白字符时，每个前导和尾随修剪操作都会停止。例如，如果当前字符串是“abc xyz”，然后 Trim 方法返回“abc xyz”。
```cs // C# program to illustrate the // method without any parameters using System;
class GFG {
// Main Method public static void Main() { string s1 = " GFG"; string s2 = " GFG "; string s3 = "GFG ";
// Before Trim method call Console.WriteLine("Before:"); Console.WriteLine(s1); Console.WriteLine(s2); Console.WriteLine(s3);
Console.WriteLine("");
// After Trim method call Console.WriteLine("After:"); Console.WriteLine(s1.Trim()); Console.WriteLine(s2.Trim()); Console.WriteLine(s3.Trim()); } } ```
输出:
```cs Before: GFG GFG GFG
After: GFG GFG GFG
```
-
示例 2: 演示公共字符串 Trim (params char[] trimChars)方法的程序。Trim 方法从当前字符串中删除参数列表中出现的所有前导和尾随字符。当遇到不在 trimChars 中的字符时，每个前导和尾随修剪操作都会停止。例如，当前字符串为“123 abc456xyz 789”，trimChars 包含从“1”到“9”的数字，则 Trim 方法返回“ABC 456 yz”。
```cs // C# program to illustrate the // method with parameters using System;
class GFG {
// Main Method public static void Main() {
// declare char[] array and // initialize character 0 to 9 char[] charsToTrim1 = {'1', '2', '3', '4', '5', '6', '7', '8', '9'};
string s1 = "123abc456xyz789"; Console.WriteLine("Before:" + s1); Console.WriteLine("After:" + s1.Trim(charsToTrim1));
Console.WriteLine("");
char[] charsToTrim2 = { '', '1', 'c' }; string s2 = "123xyz*c*c"; Console.WriteLine("Before:" + s2); Console.WriteLine("After:" + s2.Trim(charsToTrim2));
Console.WriteLine("");
char[] charsToTrim3 = { 'G', 'e', 'k', 's' }; string s3 = "GeeksForGeeks"; Console.WriteLine("Before:" + s3); Console.WriteLine("After:" + s3.Trim(charsToTrim3));
Console.WriteLine("");
string s4 = " Geeks0000"; Console.WriteLine("Before:" + s4); Console.WriteLine("After:" + s4.Trim('0')); } } ```
输出:
```cs Before:123abc456xyz789 After:abc456xyz
Before:123xyz*c**c After:23xyz
Before:GeeksForGeeks After:For
Before: Geeks0000 After: Geeks
```
关于修剪的要点()方法:
- If the pruning method removes any characters from the current instance, this method does not modify the value of the current instance. Instead, it returns a new string in which all leading and trailing whitespace characters of the current instance will be deleted.
- If the current string is equal to null or all characters in the current instance consist of space characters, this method returns null.
参考:T2】https://msdn.microsoft.com/en-us/library/system.string.trim
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