解决方法
假设你有一系列的属性,你将通过反思来走过.任何字符串可能需要验证,以检查它们不超过一定量.
然后,您可以创建一个textLength属性,使用默认的整数构造函数和整数属性/字段.然后,您可以在类中的每个字符串属性上读取属性,并将属性值的长度与属性中指定的数字进行比较.
码：
public class TextLengthAttribute : Attribute
{
private int length;
public int Length { get { retrun length; } set { length = value; } }
public TextLengthAttribute(int num) { this.length = num ; }
}
public class MyClass
{
[TextLength(10)]
public string Property1;
[TextLength(20)]
public string Property2;
}
public class ClassReader
{
public static void Main()
{
MyClass example = MyClass.GetTestData();
PropertyInfo[] props = typeof(MyClass).GetProperties();
foreach (PropertyInfo prop in props)
{
if (prop.ValueType == typeof(String)
{
TextLengthAttribute[] atts =
(TextLengthAttribute)[]prop.GetCustomAttributes(
typeof(TextLengthAttribute),false);
if (prop.GetValue(example,null).ToString().Length >
atts[0].Length)
throw new Exception(prop.name + " was too long");
}
}
}
}
注意：未经测试
