C#中List的Find方法的使用

查找List中的某个值，可以使用循环遍历对比，查找出结果。C#中提供了Find方法，可以直接使用，只要查找条件传入就可。如下：

public class RecordInfo
{
private string recordID = string.Empty;
private string itemID = string.Empty;
private string recordAndItemID = string.Empty;
private string value = string.Empty;

public string RecordID
{
get
{
return this.recordID;
}
}

public string ItemID
{
get
{
return this.itemID;
}
}

public string RecordAndItemID
{
get
{
return this.recordAndItemID;
}
}

public string Value
{
get
{
return this.value;
}
}

public RecordInfo(string tmprecordID, string tmpitemID, string tmprecordAndItemID, string tmpvalue)
{
this.recordID = tmprecordID;
this.itemID = tmpitemID;
this.recordAndItemID = tmprecordAndItemID;
this.value = tmpvalue;
}
}

 

class Program
{
    public static void Main(string[] args)
    {
        List<User> userCollection = new List<User>();

        userCollection.Add(new User(1, "testOne"));

        userCollection.Add(new User(2, "testTwo"));

        userCollection.Add(new User(3, "testThree"));

        User resultUser = userCollection.Find(

            delegate(User user)
            {
                //return user.UserID == 0;

                return user.UserID == 1 && user.UserName.Equals("testOne");
            });

        Console.WriteLine(resultUser != null ?

            resultUser.UserID + System.Environment.NewLine + resultUser.UserName : "没有查找到");

        Console.ReadLine();
    }
}

public class User
{
    private int userID = 0;

    private string userName = string.Empty;

    public int UserID
    {
        get
        {
            return this.userID;
        }
    }

    public string UserName
    {
        get
        {
            return this.userName;
        }
    }

    public User(int userID, string userName)
    {
        this.userID = userID;

        this.userName = userName;
    }
}