How can I pass a List to a construtor?
It shows a message:
Error 14 An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type
public class CustomAuthorize : AuthorizeAttribute {
private List<string> multipleProgramID;
//constructor
public CustomAuthorize(List<string> _multipleProgramID) {
multipleProgramID = _multipleProgramID;
}
}
[CustomAuthorize(new List<string>(new string[] { ProgramList.SURVEY_INPUT, ProgramList.SURVEY_OUTPUT } ))]
[HttpPost]
public ActionResult DeleteWaterQualityItems(string sourceID, string wqID) {
// ..other code...
}
public class ProgramList {
public const string SURVEY_INPUT = "A001";
public const string SURVEY_INPUT = "A002";
}
The problem isn't passing a List<string> to a constructor in general - the problem is that you're trying to use it for an attribute. You basically can't do that, because it's not a compile-time constant.
It looks like ProgramList is effectively an enum - so you might want to make it an enum instead:
[Flags]
public enum ProgramLists
{
SurveyInput,
SurveyOutput,
...
}
Then make your CustomAuthorizeAttribute (which should be named like that, with a suffix of Attribute) accept a ProgramLists in the constructor. You'd specify it as:
[CustomAuthorize(ProgramLists.SurveyInput | ProgramLists.SurveyOutput)]
You can then have a separate way of mapping each ProgramLists element to a string such as "A001". This could be done by applying an attribute to each element, or maybe having a Dictionary<ProgramLists, string> somewhere.
If you really want to keep using strings like this, you could make CustomAuthorizeAttribute accept a single comma-separated list, or make it an array instead of a list and use a parameter array:
[AttributeUsage(AttributeTargets.Method)]
public class FooAttribute : Attribute
{
public FooAttribute(params string[] values)
{
...
}
}
[Foo("a", "b")]
static void SomeMethod()
{
}
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