自动属性问题

Question

目前我正在使用.Net 3.0,但我不知道如何使用自动属性.

例如,如果我想通过Authomatic Properties编写此示例代码,我该怎么办？

private string _name = string.Empty;
private string _family = string.Empty;
//A field with default value
private DateTime _releaseDate = System.DateTime.Now;


//ReadOnly Property
public string Name
{
    get {return _name; }
}

//enforce validation rules on setting 
public string Family
{
    get { _family; }
    set
    {
        if (value.Length < 3)
            return new Exception("Family need at least 3 character long");
        else
            _family = value;
    }
}

// A property from two other fields
public string FullName
{
    get { return _name + " " + _family; }
}

谢谢大家的回复,我得到了答案

Answer 1

你不能.

自动属性只是为您创建一个私有支持字段,并将其隐藏.如果您需要在您的财产中拥有逻辑,您应该自己实施.

使用自动属性,您必须同时具有getter和setter,但您可以将setter设为私有,例如:

public string Foo { get; private set; }

顺便说一句,您不能从字符串属性返回异常.应该抛出异常,而不是返回.

public string Family
{
    get { _family; }
    set
    {
        if (value.Length < 3)
            return new Exception("Family need at least 3 character long");
        else
            _family = value;
    }
}

这应该是:

public string Family
{
    get { _family; }
    set
    {
        if (value.Length < 3)
            throw new Exception("Family need at least 3 character long");
        else
            _family = value;
    }
}