有时,并不需要可视化器的强大功能,但仍希望快速、方便地在调试窗口中查看和解释业务对象。System.Diagnostics命名空间有几个不同的特性,使用它们可以修饰类及其它成员并调整对象,以便于调试。实际上,可以降低调试窗口的混乱程度,控制定制业务对象的显示内容。
下面我们来调试一个Person类,我给出了Person类的完整代码,其中内部类PersonProxy就是为方便调试建立的类:
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Diagnostics;
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namespace MVPHacks.TestDebuggerAttributes
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{
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[DebuggerTypeProxy(typeof(PersonProxy))]
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class Person
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{
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private string _lastName = string.Empty;
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private string _firstName = string.Empty;
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private int _age = 0;
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private List<Person> _children = new List<Person>();
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private List<string> _pets = new List<string>();
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private List<string> _cars = new List<string>();
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public string LastName
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{
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get { return _lastName; }
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set { _lastName = value; }
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}
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public string FirstName
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{
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get { return _firstName; }
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set { _firstName = value; }
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}
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public int Age
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{
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get { return _age; }
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set { _age = value; }
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}
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[DebuggerBrowsable(DebuggerBrowsableState.Collapsed)]
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public List<Person> Children
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{
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get { return _children; }
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}
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[DebuggerBrowsable(DebuggerBrowsableState.Never)]
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public List<string> Pets
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{
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get { return _pets; }
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}
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[DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
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public List<string> Cars
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{
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get { return _cars; }
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}
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public Person()
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{
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}
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public Person(string lastName, string firstName, int age)
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{
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_lastName = lastName;
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_firstName = firstName;
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_age = age;
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}
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}
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}
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Diagnostics;
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using MVPHacks.TestDebuggerAttributes;
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namespace MVPHacks.TestDebuggerAttributes
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{
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class PersonProxy
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{
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private Person _person;
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public PersonProxy(Person person)
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{
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_person = person;
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}
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public string Children
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{
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get
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{
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string[] children = new string[_person.Children.Count];
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for (int i = 0; i < _person.Children.Count; i++)
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{
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children[i] = _person.Children[i].FirstName;
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}
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return string.Join(", ", children);
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}
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}
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public string Pets
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{
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get
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{
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return string.Join(", ", _person.Pets.ToArray());
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}
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}
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public string Cars
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{
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get
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{
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return string.Join(", ", _person.Cars.ToArray());
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}
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}
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[DebuggerDisplay("{_person.Age >= 21 ? \"Old Enough\"" + " : \" Too Young\"}", Type = "Alcohol Age Check")]
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public string AlcoholAgeCheck
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{
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get
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{
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return string.Empty;
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}
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}
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private string ValidateObject()
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{
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List<string> violations = new List<string>();
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// make sure that a first name has been specified
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if (0 == _person.FirstName.Length)
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{
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violations.Add("FirstName is empty");
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}
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// make sure that a last name has been specified
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if (0 == _person.LastName.Length)
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{
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violations.Add("LastName is empty");
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}
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// make sure that age is greater than 0
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if (0 > _person.Age)
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{
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violations.Add("Age is less than 0");
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}
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// put additional validations here
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// return results to DebuggerDisplay attribute
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return string.Join(", ", violations.ToArray());
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}
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[DebuggerDisplay("{ValidateObject()}")]
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public string BusinessRulesViolations
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{
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get
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{
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return string.Empty;
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}
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}
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public string Person
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{
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get
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{
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return "Name = " + _person.FirstName + " " + _person.LastName + ", Age = " + _person.Age;
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}
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}
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}
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}
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