Converting query parameter to enum

[Doug]

I have an enum that will look kind of like this:

private enum MyEnum
{
SomeValue = 0,
AnotherValue = 1,
ThirdValue = 2
}
I have an url that will pass in a value like this that I want to put
into that enum:

http://ABCSite/MyPage.aspx?MyParameter=SomeValue

I'd like to use the Request.QuerySt ring to retrieve the MyParameter
value (which equals "SomeValue" ) and convert that to an enum of type
MyEnum. Is there a quick and easy way to do it, or am I going to have
to build a select case to check all potential values that could come
in?

[Jon Skeet [C# MVP]]

Doug <dn******@dtgne t.comwrote:

public partial class MyClass : System.Web.UI.P age
{
private enum MyEnum
{
MyFirstChoice = 0,
MySecondChoice = 1,
MyThirdChoice = 2
}

protected void Page_Load(objec t sender, EventArgs e)
{

MyEnum theEnum = (MyEnum)Enum.Pa rse(typeof(MyEn um),
Request.QuerySt ring["MyValue"]);

}

}

I have a url that contains a value (in this example) called "MyValue"
and is set to "MySecondChoice ". When I run this code I get the error
"Request value 'MySecondChoice ' was not found."

Let's convert that into a short but complete program, as requested:

using System;

public partial class MyClass
{
private enum MyEnum
{
MyFirstChoice = 0,
MySecondChoice = 1,
MyThirdChoice = 2
}

static void Main()
{
MyEnum theEnum = (MyEnum)Enum.Pa rse(typeof(MyEn um),
"MySecondChoice ");

Console.WriteLi ne(theEnum);
}
}

That runs without a problem. Now, when I try an invalid value I get
"Requested value..." instead of "Request value..." as an example, which
suggests you haven't cut and pasted the actual exception directly. I
suspect that if you do so, you'll find that it wasn't "MySecondChoice "
that failed but some slight variation on it.

--
Jon Skeet - <sk***@pobox.co m>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon.skeet
C# in Depth: http://csharpindepth.com