IsNullOrWhiteSpace()
C#中的方法用于指示指定的字符串是null,空还是仅由空格字符组成。
public static bool IsNullOrWhiteSpace (string val);
上面的参数val是要测试的字符串。现在让我们看一个例子-
现在让我们看一个例子:
using System; public class Demo { public static void Main() { string str1 = null; string str2 = String.Empty; Console.WriteLine("Is string1 null or whitespace? = "+String.IsNullOrWhiteSpace(str1)); Console.WriteLine("Is string2 null or whitespace? = "+String.IsNullOrWhiteSpace(str2)); } }
输出结果
这将产生以下输出-
Is string1 null or whitespace? = True Is string2 null or whitespace? = True
现在让我们来看另一个例子-
using System; public class Demo { public static void Main() { string str1 = "\n"; string str2 = "Tim"; Console.WriteLine("Is string1 null or whitespace? = "+String.IsNullOrWhiteSpace(str1)); Console.WriteLine("Is string2 null or whitespace? = "+String.IsNullOrWhiteSpace(str2)); } }
输出结果
Is string1 null or whitespace? = True Is string2 null or whitespace? = False