How to get HttpContext.Current in model using ASP.NET Core?

Question

public string GetColumns()

{

string columns = "";

for (int i = 0; ; i++)

{

if (!string.IsNullOrEmpty(HttpContext.Current.Request.Form["columns[" + i + "][data]"]))

{

string c = Convert.ToString((HttpContext.Current.Request.Form["columns[" + i + "][data]"]));

columns += columns == "" ? c : "," + c;

}

else

break;

}

if (!string.IsNullOrEmpty(HttpContext.Current.Request.Form["Columns"]))

columns = Convert.ToString(HttpContext.Current.Request.Form["Columns"]);

return columns;

}