所以我試圖做這個工作,我似乎無法知道它爲什麼不起作用linq&distinct,執行equals&gethashcode
演示代碼;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
var myVar = new List<parent >();
myVar.Add(new parent() { id = "id1", blah1 = "blah1", c1 = new child() { blah2 = "blah2", blah3 = "blah3" } });
myVar.Add(new parent() { id = "id1", blah1 = "blah1", c1 = new child() { blah2 = "blah2", blah3 = "blah3" } });
var test = myVar.Distinct();
Console.ReadKey();
}
}
public class parent : IEquatable<parent>
{
public String id { get;set;}
public String blah1 { get; set; }
public child c1 { get; set; }
public override int GetHashCode()
{
unchecked // Overflow is fine, just wrap
{
int hash = 17;
// Suitable nullity checks etc, of course :)
hash = hash * 23 + id.GetHashCode();
hash = hash * 23 + blah1.GetHashCode();
hash = hash * 23 + (c1 == null ? 0 : c1.GetHashCode());
return hash;
}
}
public bool Equals(parent other)
{
return object.Equals(id, other.id) &&
object.Equals(blah1, other.blah1) &&
object.Equals(c1, other.c1);
}
}
public class child : IEquatable<child>
{
public String blah2 { get; set; }
public String blah3 { get; set; }
public override int GetHashCode()
{
unchecked // Overflow is fine, just wrap
{
int hash = 17;
// Suitable nullity checks etc, of course :)
hash = hash * 23 + blah2.GetHashCode();
hash = hash * 23 + blah3.GetHashCode();
return hash;
}
}
public bool Equals(child other)
{
return object.Equals(blah2, other.blah2) &&
object.Equals(blah3, other.blah3);
}
}
}
任何人都可以發現我的錯誤?
+1爲一個完整的例子。 – SLaks 2011-01-24 20:42:29
你有什麼錯誤?什麼是預期的行爲?執行你的代碼只是顯示沒有任何內容,並在按下某個鍵時退出。 – jdmichal 2011-01-24 20:44:35
@jdmichal,在控制檯上放置一個斷點。讀取鍵並查看測試變量,應該說count = 1而不是2 – Fredou 2011-01-24 20:45:44