Check if a string is NULL or EMPTY using PowerShell

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Check if a string is NULL or EMPTY using PowerShell

http://techibee.com/powershell/check-if-a-string-is-null-or-empty-using-powershell/1889 Check if a string is NULL or EMPTY using PowerShellby TECHIBEE on OCTOBER 10, 2012 In this post, I will show you how to verify if a string is empty, null or havin…

[shiro] Wildcard string cannot be null or empty. Make sure permission strings are properly formatted.

访问某页面时,出现了这个异常: java.lang.IllegalArgumentException: Wildcard string cannot be null or empty. Make sure permission strings are properly formatted. at org.apache.shiro.authz.permission.WildcardPermission.setParts(WildcardPermission.java:154) at org.apa…

转：String.Empty、string=”” 和null的区别

原文地址:http://www.cnblogs.com/fanyong/archive/2012/11/01/2750163.html String.Empty是string类的一个静态常量: String.Empty和string=””区别不大,因为String.Empty的内部实现是: public static readonly string Empty; //这就是String.Empty 那是只读的String类的成员,也是string的变量的默认值是什么呢? //String的构造函…

String.Empty、string=”” 和null的区别

String.Empty是string类的一个静态常量: String.Empty和string=””区别不大,因为String.Empty的内部实现是: 1 2 3 4 5 6 7 8 9 10 11 12 public static readonly string Empty; //这就是String.Empty 那是只读的String类的成员,也是string的变量的默认值是什么呢? //String的构造函数 static String(){ Empty = "";…

(后端)shiro:Wildcard string cannot be null or empty. Make sure permission strings are properly formatted.

访问某页面时,出现了这个异常: java.lang.IllegalArgumentException: Wildcard string cannot be null or empty. Make sure permission strings are properly formatted. at org.apache.shiro.authz.permission.WildcardPermission.setParts(WildcardPermission.java:154) at org.apa…