泛型怎么根据ID删除？
private List<ProductItem> _items;public void DeleteItem(int productid)
{
_items.RemoveAt(productid);//productid是物品编码
_lastUpdate = DateTime.Now;
}
而RomoveAt(i)的参数是泛型内部的排序号！怎么根据我productid进行删除？
--------------------编程问答-------------------- Remove () --------------------编程问答-------------------- 你应该用System.Collections.Generic.Dictionary
如果非要用List 的话只能循环了 --------------------编程问答--------------------
--------------------编程问答-------------------- 顶,楼上的! --------------------编程问答-------------------- 这个是MSDN上的，我看过了，用的是Remove()，我现在要用RemoveAt(),
using System;
using System.Collections.Generic;
public class Example
{
public static void Main()
{
List<string> dinosaurs = new List<string>();
Console.WriteLine("\nCapacity: {0}", dinosaurs.Capacity);
dinosaurs.Add("Tyrannosaurus");
dinosaurs.Add("Amargasaurus");
dinosaurs.Add("Mamenchisaurus");
dinosaurs.Add("Deinonychus");
dinosaurs.Add("Compsognathus");
Console.WriteLine();
foreach(string dinosaur in dinosaurs)
{
Console.WriteLine(dinosaur);
}
Console.WriteLine("\nCapacity: {0}", dinosaurs.Capacity);
Console.WriteLine("Count: {0}", dinosaurs.Count);
Console.WriteLine("\nContains(\"Deinonychus\"): {0}",
dinosaurs.Contains("Deinonychus"));
Console.WriteLine("\nInsert(2, \"Compsognathus\")");
dinosaurs.Insert(2, "Compsognathus");
Console.WriteLine();
foreach(string dinosaur in dinosaurs)
{
Console.WriteLine(dinosaur);
}
Console.WriteLine("\ndinosaurs[3]: {0}", dinosaurs[3]);
Console.WriteLine("\nRemove(\"Compsognathus\")");
dinosaurs.Remove("Compsognathus");
Console.WriteLine();
foreach(string dinosaur in dinosaurs)
{
Console.WriteLine(dinosaur);
}
dinosaurs.TrimExcess();
Console.WriteLine("\nTrimExcess()");
Console.WriteLine("Capacity: {0}", dinosaurs.Capacity);
Console.WriteLine("Count: {0}", dinosaurs.Count);
dinosaurs.Clear();
Console.WriteLine("\nClear()");
Console.WriteLine("Capacity: {0}", dinosaurs.Capacity);
Console.WriteLine("Count: {0}", dinosaurs.Count);
}
}
/* This code example produces the following output:
Capacity: 0
Tyrannosaurus
Amargasaurus
Mamenchisaurus
Deinonychus
Compsognathus
Capacity: 8
Count: 5
Contains("Deinonychus"): True
Insert(2, "Compsognathus")
Tyrannosaurus
Amargasaurus
Compsognathus
Mamenchisaurus
Deinonychus
Compsognathus
dinosaurs[3]: Mamenchisaurus
Remove("Compsognathus")
Tyrannosaurus
Amargasaurus
Mamenchisaurus
Deinonychus
Compsognathus
TrimExcess()
Capacity: 5
Count: 5
Clear()
Capacity: 5
Count: 0
*/
是否可行，怎么操作？ --------------------编程问答--------------------
--------------------编程问答--------------------
public void DeleteItem(int productid)
{
for(int i =0;i<list.Count;i++)
{
if (list[i].ID == productid)
{
list.Remove(list[i]);
break;
}
}
}
RemoveAt的话..就RemoveAt上面例子中的i --------------------编程问答-------------------- lovehongyun:RemoveAt()参数是内部序列号，不是自己可以定义的
我在考虑是否可以用Predicate解决， --------------------编程问答--------------------
--------------------编程问答--------------------
public void DeleteItem(int productid)
{
for(int i=0;i<_items.Length;i++)
{
if(_items[i].ProductId = productid)
{
_items.RemoveAt(i);
}
}
}
RemoveAt()方法移除的是索引,你看下msdn
如果你要是按productid(内部ID)来删除的话.就用6楼.. --------------------编程问答-------------------- 用HashTable做...有Key..
补充：.NET技术 , ASP.NET
