public void EnumConverterLiternalOk()
{
EnumConverterAttribute enumConverter = new EnumConverterAttribute(typeof(TestEnum));
TestDecorator valueProvider = new TestDecorator("TestValue1");
enumConverter.SetDecorator(valueProvider);
TestEnum actual = (TestEnum)enumConverter.GetValue();
Assert.AreEqual(TestEnum.TestValue1, actual);
}
public void EnumConverterDescriptionOk()
{
EnumConverterAttribute enumConverter = new EnumConverterAttribute(typeof(TestEnum));
TestDecorator valueProvider = new TestDecorator("DescriptionValue1");
enumConverter.SetDecorator(valueProvider);
TestEnum actual = (TestEnum)enumConverter.GetValue();
Assert.AreEqual(TestEnum.DescVal1, actual);
}
/// <summary>
/// Converts an object to its <see cref="string"/> representation to be sent with requests to the Stack Exchange API.
/// </summary>
protected string ConvertToString(object o)
{
if (o != null)
{
// If the object is an IEnumerable, converts each element of it to its string representation via the `ConvertToString` method, delimiting them with a single comma.
// Although `(IEnumerable<SomeEnum> as object) is IEnumerable<int>`, its conversion will work because each `SomeEnum` is individually converted.
// `SomeString is IEnumerable<char>`, and therefore will have to be guarded against, here.
if (o is IEnumerable ie && !(o is string))
{
return(String.Join
(
",",
ie.Cast <object>()
.Select((obj) => ConvertToString(obj))
.OfType <string>()
.Distinct()
));
}
switch (o)
{
case int i:
return(i.ToString());
case bool b:
return(b.ToString());
case string s when !String.IsNullOrWhiteSpace(s):
return(s.Trim());
case DateTime d:
// Converts a DateTime to unix time.
// "Dates are [...] guaranteed to fit in a signed 64-bit integer."
// https://api.stackexchange.com/docs/numbers
return(((long)d.Subtract(unixEpoch).TotalSeconds).ToString());
case Guid g:
return(g.ToString().ToUpper());
}
if (EnumConverterAttribute.TryGetForObject(o, out var attribute))
{
var converter = (EnumConverter)Activator.CreateInstance(attribute.ConverterType);
return(converter.GetString(o));
}
}
return(null);
}
