StringSplitOptions StringSplitOptions StringSplitOptions StringSplitOptions Enum

定义

指定适用的 Split 方法重载包含还是省略返回值中的空子字符串。Specifies whether applicable Split method overloads include or omit empty substrings from the return value.

此枚举有一个 FlagsAttribute 属性,允许按位组合成员值。

public enum class StringSplitOptions
[System.Flags]
[System.Runtime.InteropServices.ComVisible(false)]
public enum StringSplitOptions
type StringSplitOptions = 
Public Enum StringSplitOptions
继承
StringSplitOptionsStringSplitOptionsStringSplitOptionsStringSplitOptions
属性

字段

None None None None 0

返回值包括含有空字符串的数组元素The return value includes array elements that contain an empty string

RemoveEmptyEntries RemoveEmptyEntries RemoveEmptyEntries RemoveEmptyEntries 1

返回值不包括含有空字符串的数组元素The return value does not include array elements that contain an empty string

示例

下面的代码示例使用RemoveEmptyEntries枚举来包括或排除子字符串由生成String.Split方法。The following code example uses the RemoveEmptyEntries enumeration to include or exclude substrings generated by the String.Split method.

// This example demonstrates the String.Split(Char[], Boolean) and 
//                               String.Split(Char[], Int32, Boolean) methods
using namespace System;
void Show( array<String^>^entries )
{
   Console::WriteLine( "The return value contains these {0} elements:", entries->Length );
   System::Collections::IEnumerator^ myEnum = entries->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ entry = safe_cast<String^>(myEnum->Current);
      Console::Write( "<{0}>", entry );
   }

   Console::Write( "{0}{0}", Environment::NewLine );
}

int main()
{
   String^ s = ",one,,,two,,,,,three,,";
   array<Char>^sep = gcnew array<Char>{
      ','
   };
   array<String^>^result;
   
   //
   Console::WriteLine( "The original string is \"{0}\".", s );
   Console::WriteLine( "The separation character is '{0}'.", sep[ 0 ] );
   Console::WriteLine();
   
   //
   Console::WriteLine( "Split the string and return all elements:" );
   result = s->Split( sep, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return all non-empty elements:" );
   result = s->Split( sep, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 elements:" );
   result = s->Split( sep, 2, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 non-empty elements:" );
   result = s->Split( sep, 2, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
}

/*
This example produces the following results:

The original string is ",one,,,two,,,,,three,,".
The separation character is ','.

Split the string and return all elements:
The return value contains these 12 elements:
<><one><><><two><><><><><three><><>

Split the string and return all non-empty elements:
The return value contains these 3 elements:
<one><two><three>

Split the string and return 2 elements:
The return value contains these 2 elements:
<><one,,,two,,,,,three,,>

Split the string and return 2 non-empty elements:
The return value contains these 2 elements:
<one><,,two,,,,,three,,>

*/
// This example demonstrates the String() methods that use
// the StringSplitOptions enumeration.
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 using a local function
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:
<><ONE><><TWO><><><THREE><><>

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

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

1e) Split a string delimited by characters and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO,,,THREE,,>

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:
<><ONE><><TWO><><><THREE><><>

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

2d) Split a string delimited by another string and return 2 elements:
The return value contains these 2 elements:
<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>

2e) Split a string delimited by another string and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO[stop][stop][stop]THREE[stop][stop]>

*/

' This example demonstrates the String() methods that use
' the StringSplitOptions enumeration.
Imports System

Class Sample
    Public Shared Sub Main() 
        Dim s1 As String = ",ONE,,TWO,,,THREE,,"
        Dim s2 As String = "[stop]" & _
                           "ONE[stop][stop]" & _
                           "TWO[stop][stop][stop]" & _
                           "THREE[stop][stop]"
        Dim charSeparators() As Char = {","c}
        Dim stringSeparators() As String = {"[stop]"}
        Dim result() As String
        ' ------------------------------------------------------------------------------
        ' Split a string delimited by characters.
        ' ------------------------------------------------------------------------------
        Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)
        
        ' Display the original string and delimiter characters.
        Console.WriteLine("1a )The original string is ""{0}"".", s1)
        Console.WriteLine("The delimiter character is '{0}'." & vbCrLf, 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:" & vbCrLf)
        
        ' Display the original string and delimiter string.
        Console.WriteLine("2a) The original string is ""{0}"".", s2)
        Console.WriteLine("The delimiter string is ""{0}""." & vbCrLf, 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)
    
    End Sub 'Main
    
    
    ' Display the array of separated strings.
    Public Shared Sub Show(ByVal entries() As String) 
        Console.WriteLine("The return value contains these {0} elements:", entries.Length)
        Dim entry As String
        For Each entry In  entries
            Console.Write("<{0}>", entry)
        Next entry
        Console.Write(vbCrLf & vbCrLf)
    
    End Sub 'Show
End Class 'Sample
'
'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:
'<><ONE><><TWO><><><THREE><><>
'
'1c) Split a string delimited by characters and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'1d) Split a string delimited by characters and return 2 elements:
'The return value contains these 2 elements:
'<><ONE,,TWO,,,THREE,,>
'
'1e) Split a string delimited by characters and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO,,,THREE,,>
'
'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:
'<><ONE><><TWO><><><THREE><><>
'
'2c) Split a string delimited by another string and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'2d) Split a string delimited by another string and return 2 elements:
'The return value contains these 2 elements:
'<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>
'
'2e) Split a string delimited by another string and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO[stop][stop][stop]THREE[stop][stop]>
'

注解

String.Split方法返回由指定的字符或字符串分隔给定字符串中的一个子字符串数组。The String.Split method returns an array of the substrings in a given string that are delimited by specified characters or strings. 相邻分隔符生成的数组元素,包含一个空字符串 ("")。Adjacent delimiters yield an array element that contains an empty string (""). StringSplitOptions枚举指定是否返回的数组中包含的数组元素,包含一个空字符串。The values of the StringSplitOptions enumeration specify whether an array element that contains an empty string is included in the returned array.

指定 None 值要调用的默认行为String.Split方法,它将返回空的子字符串和不为空的子字符串的数组。Specify the None value to invoke the default behavior of the String.Split method, which is to return an array of both empty substrings and substrings that are not empty. 指定 RemoveEmptyEntries 值会导致String.Split方法以返回仅包含的子字符串不为空数组。Specify the RemoveEmptyEntries value to cause the String.Split method to return an array consisting solely of substrings that are not empty.

适用于

另请参阅