C# if statement syntax with list of objects

Question

I have a list of objects, called Attributes, that, essentially, i need to do the following in C#

<pseudocode>
if (list.Contains(Attribute where getName() == "owner"))
{
   do stuff
}
</pseudocode>

the problem I'm having is the nested bracket bit of the if - "Attribute where getName() == "owner". This is my code - it doesn't work, obviously, but most of the if should be right, it's just getting that i need to do the bit in forward slashes and i don't know how.

if (attributes.Contains(Attribute /where/ attribute.getName() == "Owner"))
    {
        string value = attr.getValue();
        value = value.Replace(domain, "");
        user = value;
        UserExists(value);
    }

I'm probably being dense, but I had to restart 3 days development to change everything to using Attribute objects, so my brain is rather destroyed. Sorry.

Answer 1

You can use LINQ to objects

if (attributes.Count(a => a.getName() == "Owner") > 0)

Answer 2

If you are using a version of .NET that supports LINQ, try

if(attributes.Any(attribute=>attribute.getName()=="Owner")

Answer 3

if(list.Exists(e=>e.getName() == "owner")) {
   //yup
}

Answer 4

are you using .NET 3.5 or above, if so and presuming that 'attributes' is derived from IEnumerable, you could do the following :

if (attributes.Any(attrib=>attrib.GetName() == "Owner"))
{
    //Do code here...
}

Answer 5

Please have a look:

var filteredAttributes = from attribute in Attributes 
                         where string.Compare(attribute.getName() ,"Owner",true)==0
                         select attribute;

foreach(var attribute in filteredAttributes)
{
          string value = attr.getValue();
                value = value.Replace(domain, "");
                user = value;
                UserExists(value);

}

Answer 6

Ok, i worked it out, I found a much better way to do it:

for (int i = 0; i < attributes.Count; i++)
{
    if (attributes[i].getName() == "Owner")
    {
       string value = attributes[i].getValue();
       value = value.Replace(domain, "");
       user = value;
       UserExists(value);
    }
}

which makes more sense, and actually works.

Answer 7

You can use LINQ to separate out the required attributes...

IEnumerable<TAttribute> ownerAttributes =
    attributes.Where(attribute => attribute.getName() == "Owner");

... and then iterate over those attributes, applying the relevant logic...

foreach(TAttribute attribute in ownerAttributes)
{
    // Do stuff...
}

Answer 8

Without LINQ!:

if (list.Exists(delegate(Attribute a) { return a.GetName() == "Owner"; }))