Create object with generic class as list

Question

I have this situation:

public class ExtResult<T>
{
    public bool Success { get; set; }
    public string Msg { get; set; }
    public int Total { get; set; }
    public T Data { get; set; }
}

//create list object:
List<ProductPreview> gridLines;
...
...
//At the end i would like to create object
ExtResult<gridLines> result = new ExtResult<gridLines>() { 
    Success = true, Msg = "", 
    Total=0, 
    Data = gridLines 
}

But I get an error:

error: "cannot resolve gridLines"

What can I do to fix this?

"What is correct way?" - to do what? (and mostly likely the answer is to learn about generics) — Amit
– Amit, Commented Mar 25, 2016 at 15:00

Lee · Accepted Answer · 2016-03-25 15:01:49Z

4

gridLines is a variable, its type is List<ProductPreview> which you should use as the type parameter to ExtResult<T>:

ExtResult<List<ProductPreview>> result = new ExtResult<List<ProductPreview>>() { 
    Success = true, 
    Msg = "", 
    Total=0, 
    Data = gridLines 
};

answered Mar 25, 2016 at 15:01

Lee

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1 Comment

Simon Over a year ago

Of course, thank you. I was mislead by some example :)

awesoon · Accepted Answer · 2016-03-25 15:01:37Z

2

You should pass a type as a generic argument, not a variable:

var result = new ExtResult<List<ProductPreview>> // not gridLines, but it's type
{ 
    Success = true,
    Msg = "",
    Total=0,
    Data = gridLines
}

answered Mar 25, 2016 at 15:01

awesoon

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