String.IsNullOrEmpty官方示例

// This example demonstrates the String.IsNullOrEmpty() method

using System;

class Sample

{

    public static void Main()

    {

    string s1 = "abcd";

    string s2 = "";

    string s3 = null;

    Console.WriteLine("String s1 {0}.", Test(s1));

    Console.WriteLine("String s2 {0}.", Test(s2));

    Console.WriteLine("String s3 {0}.", Test(s3));

    }

    public static String Test(string s)

    {

    if (String.IsNullOrEmpty(s) == true)

        return "is null or empty";

    else

        return String.Format("(\"{0}\") is not null or empty", s);

    }

}

/*

This example produces the following results:

String s1 ("abcd") is not null or empty.

String s2 is null or empty.

String s3 is null or empty.

*/

String类提供的这个IsNullOrEmpty方法十分的优雅，英语就是graceful。String的话一般都会有""和null两种情况，如果自己写，用if(s=="" || s==Null)就不太美妙了。

Normal
0

7.8 磅
0
2

false
false
false

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ZH-CN
X-NONE

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巴特西

String.IsNullOrEmpty官方示例

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