c#:找不到列表中的对象

Question

我正在使用LINQ .Find(),当它找到匹配时它不会停止.我有:

List<ipFound> ipList = new List<ipFound>();

ipFound ipTemp = ipList.Find(x => x.ipAddress == srcIP); 

if (ipTemp == null) {
   // this is always null
}

public class ipFound
{
    public System.Net.IPAddress ipAddress;
    public int bytesSent;
    public int bytesReceived;
    public int bytesTotal;
}

有任何想法吗？我在这里疯了.

谢谢!

Answer 1

你需要使用.Equals而不是==.

var a = IPAddress.Parse("1.2.3.4");
var b = IPAddress.Parse("1.2.3.4");
Console.WriteLine(a == b);  // False
Console.WriteLine(a.Equals(b));  // True

在上面的示例中,a == b是False因为它们是两个不同的对象.然而,a.Equals(b)是True因为它们具有相同的值.

Answer 2

使用IPAddress.Equals而不是比较references(==):

ipFound ipTemp = ipList.Find(x => x.ipAddress.Equals(srcIP)); 

作为旁注,通常类名是PascalCased(IPFoundvs. ipFound)

示例: http ://ideone.com/lAeiMm