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String.EndsWith 方法 (String)

 

判斷這個字串執行個體的結尾是否符合指定的字串。

命名空間:   System
組件:  mscorlib (於 mscorlib.dll)

public bool EndsWith(
	string value
)

參數

value
Type: System.String

要在這個執行個體結束時,與子字串比較的字串。

傳回值

Type: System.Boolean

如果 true 符合這個執行個體的結尾,則為 value,否則為 false

Exception Condition
ArgumentNullException

valuenull

This method compares value to the substring at the end of this instance that is the same length as value, and returns an indication whether they are equal. To be equal, value must be a reference to this same instance or match the end of this instance.

This method performs a word (case-sensitive and culture-sensitive) comparison using the current culture.

呼叫端注意事項︰

As explained in Best Practices for Using Strings in the .NET Framework, we recommend that you avoid calling string comparison methods that substitute default values and instead call methods that require parameters to be explicitly specified. To determine whether a string ends with a particular substring by using the string comparison rules of the current culture, call the M:System.String.EndsWith(System.String,System.StringComparison) method overload with a value of F:System.StringComparison.CurrentCulture for its comparisonType parameter.

The following example indicates whether each string in an array ends with a period (".").

using System;

public class Example
{
   public static void Main()
   {
      String[] strings = { "This is a string.", "Hello!", "Nothing.", 
                           "Yes.", "randomize" };
      foreach (var value in strings) {
         bool endsInPeriod = value.EndsWith(".");
         Console.WriteLine("'{0}' ends in a period: {1}", 
                           value, endsInPeriod);
      }                            
   }
}
// The example displays the following output:
//       'This is a string.' ends in a period: True
//       'Hello!' ends in a period: False
//       'Nothing.' ends in a period: True
//       'Yes.' ends in a period: True
//       'randomize' ends in a period: False

The following example defines a StripEndTags method that uses the M:System.String.EndsWith(System.String) method to remove HTML end tags from the end of a line. Note that the StripEndTags method is called recursively to ensure that multiple HTML end tags at the end of the line are removed.

using System;

public class EndsWithTest {
    public static void Main() {

        // process an input file that contains html tags.
        // this sample checks for multiple tags at the end of the line, rather than simply
        // removing the last one.
        // note: HTML markup tags always end in a greater than symbol (>).

        string [] strSource = { "<b>This is bold text</b>", "<H1>This is large Text</H1>",
                "<b><i><font color=green>This has multiple tags</font></i></b>",
                "<b>This has <i>embedded</i> tags.</b>",
                "This line simply ends with a greater than symbol, it should not be modified>" };

        Console.WriteLine("The following lists the items before the ends have been stripped:");
        Console.WriteLine("-----------------------------------------------------------------");

        // print out the initial array of strings
        foreach ( string s in strSource )
            Console.WriteLine( s );

        Console.WriteLine();

        Console.WriteLine("The following lists the items after the ends have been stripped:");
        Console.WriteLine("----------------------------------------------------------------");

        // print out the array of strings
        foreach (var s in strSource)
            Console.WriteLine(StripEndTags(s));
    }

    private static string StripEndTags( string item ) {

        bool found = false;

        // try to find a tag at the end of the line using EndsWith
        if (item.Trim().EndsWith(">")) {

            // now search for the opening tag...
            int lastLocation = item.LastIndexOf( "</" );

            // remove the identified section, if it is a valid region
            if ( lastLocation >= 0 ) {
                found = true;
                item =  item.Substring( 0, lastLocation );
            }    
        }

        if (found)
           item = StripEndTags(item);

        return item;
    }
}
// The example displays the following output:
//    The following lists the items before the ends have been stripped:
//    -----------------------------------------------------------------
//    <b>This is bold text</b>
//    <H1>This is large Text</H1>
//    <b><i><font color=green>This has multiple tags</font></i></b>
//    <b>This has <i>embedded</i> tags.</b>
//    This line simply ends with a greater than symbol, it should not be modified>
//    
//    The following lists the items after the ends have been stripped:
//    ----------------------------------------------------------------
//    <b>This is bold text
//    <H1>This is large Text
//    <b><i><font color=green>This has multiple tags
//    <b>This has <i>embedded</i> tags.
//    This line simply ends with a greater than symbol, it should not be modified>

通用 Windows 平台
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.NET Framework
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