I have a IList<T>
which has data and i want to access the field value from the IList.
I have written below code to get field value
IList<T> source;
source.FirstOrDefault().Field("ParentID")
I want to access ParentID field value.
But it is giving following error while building the solution:
"'T' does not contain a definition for 'Field' and no extension method 'Field' accepting a first argument of type 'T' could be found (are you missing a using directive or an assembly reference?)"
I have added System.Xml, System.Xml.Linq and System.Collections.Generic assembly, but still it doesn't work. Can anybody help?
Here is some generics 101.
Let's say you had a class named Node
, which contained a property named ParentID
.
public class Node
{
public int ParentId { get; set; }
}
Now you define a list of nodes. Basically an array of objects. In List<T>
the T
refers to the type of objects in your list. So you would define it as such:
IList<Node> source;
Then you would need to populate your list named source
.
And then you could select the ParentId
with the code you wrote.
source.FirstOrDefault().Field("ParentID")
将source.FirstOrDefault()强制转换为适当的类,例如: ((Employee)source.FirstOrDefault()).Field("ParentID")
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