public void FooBar(String _connectionString, Decimal p_Query_Type, DateTime? p_Date_Start = new DateTime(2006, 1, 1), DateTime? p_Date_End, Decimal? p_Number = null, Decimal? p_Group_Id = null) Visual Studio doesn't like how I initialized p_Date_Start
how do I set a value if the developer using my API doesn't need a value to p_Date_Start?
Error from Visual Studio
Error CS1736 Default parameter value for 'p_Date_Start' must be a compile-time constant
Default parameter for value must be a compile time constant. Dynamically calculated value is not accepted by compiler against optional parameter.
Let's say as anlternative DateTime? = null; and in method,
var effective_p_Date_Start = p_Date_Start ?? new DateTime(2006, 1, 1) If necessary, you can follow up the way for others.
You can use null as the default value, and then handle the null case in the method body:
public void FooBar(String _connectionString, Decimal p_Query_Type, DateTime? p_Date_Start = null, DateTime? p_Date_End, Decimal? p_Number = null, Decimal? p_Group_Id = null) { if (p_Date_Start == null) p_Date_Start = new DateTime(2006, 1, 1); // more stuff here } roughly like this:
in methodhead use
DateTime? p_Date_Start = null and in the method:
p_Date_Start ??= new DateTime(2006, 1, 1) also I should mention that DateTime? p_Date_End also needs a default since all optional parameters must come at last