C# 为什么要为属性创建私有字段？
我一直在比较属性和字段的例子，有一件事我总是不加解释地看到，那就是创建一个私有字段，然后创建一个属性。为什么我们需要C# 为什么要为属性创建私有字段？,c#,properties,c#-6.0,C#,Properties,C# 6.0,我一直在比较属性和字段的例子，有一件事我总是不加解释地看到，那就是创建一个私有字段，然后创建一个属性。为什么我们需要\u foo，而不能像下面那样运行代码，或者用foo=value替换foo=foo 当我运行它时，我看到它创建了一个堆栈溢出异常，所以我猜它正在寻找一个值来填充Foo或value，但我认为当我执行def.Foo=55时会处理这个问题 即使创建私有字段是最佳实践，我仍然希望更好地了解导致溢出的实际原因 class ABC { private int _foo; //Why c
\u foofoo=valuefoo=fooFoovaluedef.Foo=55class ABC
{
private int _foo; //Why create this?
public int Foo
{
get { return Foo; }
set
{
Foo = Foo;//more logic would go here. }
}
}
}
class Program
{
static void Main(string[] args)
{
ABC def = new ABC();
def.Foo = 55;
Console.WriteLine($"The value of Foo is {def.Foo}.");
Console.ReadLine();
}
}
这是因为字段和属性不相同
private int _foo; //field
public int Foo //property
{
get { return _foo; } //should be _foo
set
{
_foo = value;
}
}
private bool selectedIndexChanged; //note this additional field
public bool SelectedIndexChanged {
get { return selectedIndexChanged; }
set { selectedIndexChanged = value; }
}
private int selectedIndex; //Why create this?
public int SelectedIndex
{
get { return selectedIndex; }
set
{
selectedIndexChanged = value != selectedIndex; //you update selectedIndexChanged here!
selectedIndex = value;
}
}
private int _score;
public int Score
{
get { return _score; }
set
{
if(value > 100)
throw new Exception("Score cannot be more than 100");
_score = value;
}
}
private int _foo; //Why create this?
public int Foo
{
get { return Foo; } //this should not happen, wrong practice
set
{
Foo = Foo; //neither should this happen, another wrong practice
}
}
因此导致溢出…这是因为字段和属性不相同
private int _foo; //field
public int Foo //property
{
get { return _foo; } //should be _foo
set
{
_foo = value;
}
}
private bool selectedIndexChanged; //note this additional field
public bool SelectedIndexChanged {
get { return selectedIndexChanged; }
set { selectedIndexChanged = value; }
}
private int selectedIndex; //Why create this?
public int SelectedIndex
{
get { return selectedIndex; }
set
{
selectedIndexChanged = value != selectedIndex; //you update selectedIndexChanged here!
selectedIndex = value;
}
}
private int _score;
public int Score
{
get { return _score; }
set
{
if(value > 100)
throw new Exception("Score cannot be more than 100");
_score = value;
}
}
private int _foo; //Why create this?
public int Foo
{
get { return Foo; } //this should not happen, wrong practice
set
{
Foo = Foo; //neither should this happen, another wrong practice
}
}