How to validate left argument in my operator == method

[Johan]

Hi!

I have these to methods:

public override bool Equals(object obj)
{
if (obj == null)
return false;

Arg a = obj as Arg;
if (t == null)
return false;

return Id == t.Id;
}
public static bool operator ==(Arg left, Arg right)
{

return left.Equals(right);
}
I want to check if argument left is null in the ==method. But if i do it
like this
if(left == null)
that causes an infinite recursive call. So any suggestions on how to solve
this problem?

[Bruce Wood]

On May 30, 10:14 pm, "Johan" <[e-mail]:

Hi!

I have these to methods:

public override bool Equals(object obj)
{
if (obj == null)
return false;

Arg a = obj as Arg;
if (t == null)
return false;

return Id == t.Id;
}
public static bool operator ==(Arg left, Arg right)
{

return left.Equals(right);
}
I want to check if argument left is null in the ==method. But if i do it
like this
if(left == null)
that causes an infinite recursive call. So any suggestions on how to solve
this problem?

How about

if (Object.ReferenceEquals(left, null))

?

[Mattias Sjögren]

>I want to check if argument left is null in the ==method. But if i do it

>like this
if(left == null)
that causes an infinite recursive call. So any suggestions on how to solve
this problem?

Cast to Object will prevent your operator overload to be called

if ((object)left == null)

Another way is to use Object.ReferenceEquals

if (Object.ReferenceEquals(left, null))
Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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