构建可枚举类型（IEnumerable和IEnumerator接口）

来源：互联网发布：arma预测模型软件编辑：程序博客网时间：2024/05/18 00:34

1.IEnumberable接口

public interface IEnumberable
{
IEnumerator GetEnumerator(); //返回对另一个接口的引用IEnumerator
}

2.IEnumerator接口

public interface IEnumerator
{
bool MoveNext(); //将光标的内部位置向前移动
object Current { get; } //获取当前的项
void Reset(); //将光标重置到第一个成员前面
}

3.实现可枚举类型

public class MyClass1
{
public string Name { get; set; }
public string Id { get; set; }
}
public class MyClass2:IEnumerable
{
private MyClass1[] carArray = new MyClass1[4];
public MyClass2()
{
carArray[0] = new MyClass1 { Name = "Test1", Id = "1" };
carArray[1] = new MyClass1 { Name = "Test2", Id = "2" };
carArray[2] = new MyClass1 { Name = "Test3", Id = "3" };
}

public IEnumerator GetEnumerator()
{
return new MyClass3(carArray);
}
}
public class MyClass3:IEnumerator
{
private MyClass1[] myCls1 = null;
private int count = 0;
public MyClass3(MyClass1[] myCls1)
{
this.myCls1 = myCls1;
}
public object Current
{
get { return myCls1[count]; }
}

public bool MoveNext()
{
count = count+1;
if (count >= myCls1.Length)
{
return false;
}
else
{
return true;
}

}

public void Reset()
{
count = 0;
}
}
public class MyClass4
{
private void Func1()
{
MyClass2 cls2 = new MyClass2();
foreach (MyClass1 item in cls2)
{
item.Name = "1";
item.Id = "20";
}
}
}

4.使用yield关键字构建迭代器方法

public class MyClass2 : IEnumerable
{
private MyClass1[] carArray = new MyClass1[4];
public MyClass2()
{
carArray[0] = new MyClass1 { Name = "Test1", Id = "1" };
carArray[1] = new MyClass1 { Name = "Test2", Id = "2" };
carArray[2] = new MyClass1 { Name = "Test3", Id = "3" };
}

public IEnumerator GetEnumerator()
{
//return new MyClass3(carArray);
foreach (MyClass1 cls1 in carArray)
{
yield return cls1;
}
}
}

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