System.StringSplitOptions 枚举

System.StringSplitOptions 枚举例子

下面的代码示例使用 StringSplitOptions 枚举来包含或排除由 Split 方法生成的子字符串。

// This example demonstrates the String() methods that use
// the StringSplitOptions enumeration.
using System;

class Sample 
{
    public static void Main() 
    {
    string s1 = ",ONE,,TWO,,,THREE,,";
    string s2 = "[stop]" +
                "ONE[stop][stop]" +
                "TWO[stop][stop][stop]" +
                "THREE[stop][stop]";
    char[] charSeparators = new char[] {','};
    string[] stringSeparators = new string[] {"[stop]"};
    string[] result;
// ------------------------------------------------------------------------------
// Split a string delimited by characters.
// ------------------------------------------------------------------------------
    Console.WriteLine("1) Split a string delimited by characters:\n");

// Display the original string and delimiter characters.
    Console.WriteLine("1a )The original string is \"{0}\".", s1);
    Console.WriteLine("The delimiter character is '{0}'.\n", 
                       charSeparators[0]);

// Split a string delimited by characters and return all elements.
    Console.WriteLine("1b) Split a string delimited by characters and " +
                      "return all elements:");
    result = s1.Split(charSeparators, StringSplitOptions.None);
    Show(result);

// Split a string delimited by characters and return all non-empty elements.
    Console.WriteLine("1c) Split a string delimited by characters and " +
                      "return all non-empty elements:");
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
    Show(result);

// Split the original string into the string and empty string before the 
// delimiter and the remainder of the original string after the delimiter.
    Console.WriteLine("1d) Split a string delimited by characters and " +
                      "return 2 elements:");
    result = s1.Split(charSeparators, 2, StringSplitOptions.None);
    Show(result);

// Split the original string into the string after the delimiter and the 
// remainder of the original string after the delimiter.
    Console.WriteLine("1e) Split a string delimited by characters and " +
                      "return 2 non-empty elements:");
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
    Show(result);

// ------------------------------------------------------------------------------
// Split a string delimited by another string.
// ------------------------------------------------------------------------------
    Console.WriteLine("2) Split a string delimited by another string:\n");

// Display the original string and delimiter string.
    Console.WriteLine("2a) The original string is \"{0}\".", s2);
    Console.WriteLine("The delimiter string is \"{0}\".\n", stringSeparators[0]);

// Split a string delimited by another string and return all elements.
    Console.WriteLine("2b) Split a string delimited by another string and " +
                      "return all elements:");
    result = s2.Split(stringSeparators, StringSplitOptions.None);
    Show(result);

// Split the original string at the delimiter and return all non-empty elements.
    Console.WriteLine("2c) Split a string delimited by another string and " +
                      "return all non-empty elements:");
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
    Show(result);

// Split the original string into the empty string before the 
// delimiter and the remainder of the original string after the delimiter.
    Console.WriteLine("2d) Split a string delimited by another string and " +
                      "return 2 elements:");
    result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
    Show(result);

// Split the original string into the string after the delimiter and the 
// remainder of the original string after the delimiter.
    Console.WriteLine("2e) Split a string delimited by another string and " + 
                      "return 2 non-empty elements:");
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
    Show(result);
    }

// Display the array of separated strings.
    public static void Show(string[] entries)
    {
    Console.WriteLine("The return value contains these {0} elements:", entries.Length);
    foreach (string entry in entries)
        {
        Console.Write("<{0}>", entry);
        }
    Console.Write("\n\n");
    }
}
/*
This example produces the following results:

1) Split a string delimited by characters:

1a )The original string is ",ONE,,TWO,,,THREE,,".
The delimiter character is ','.

1b) Split a string delimited by characters and return all elements:
The return value contains these 9 elements:
<><><><><><>

1c) Split a string delimited by characters and return all non-empty elements:
The return value contains these 3 elements:


1d) Split a string delimited by characters and return 2 elements:
The return value contains these 2 elements:
<>

1e) Split a string delimited by characters and return 2 non-empty elements:
The return value contains these 2 elements:


2) Split a string delimited by another string:

2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
The delimiter string is "[stop]".

2b) Split a string delimited by another string and return all elements:
The return value contains these 9 elements:
<><><><><><>

2c) Split a string delimited by another string and return all non-empty elements:
The return value contains these 3 elements:


2d) Split a string delimited by another string and return 2 elements:
The return value contains these 2 elements:
<>

2e) Split a string delimited by another string and return 2 non-empty elements:
The return value contains these 2 elements:


*/

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