internal static ArgumentException BodyShouldBeOfType(this LambdaExpression expression, string paramName,
params Type[] allowedTypes)
{
switch (allowedTypes.Length)
{
case 0:
throw new ArgumentException("At least one type needs to be allowed.", nameof(allowedTypes));
case 1:
return(expression.BodyShouldBeOfType(paramName, allowedTypes[0]));
default:
var sb = new StringBuilder();
foreach (var type in allowedTypes.Take(allowedTypes.Length - 2))
{
sb.Append(type.Name).Append(", ");
}
sb.Append(allowedTypes[allowedTypes.Length - 2]).Append(" or ")
.Append(allowedTypes[allowedTypes.Length - 1]);
return(expression.BodyShouldBeOfTypeImpl(paramName, sb.ToString()));
}
}
internal static ArgumentException BodyShouldBeOfType(this LambdaExpression expression, string paramName,
Type allowedType)
{
return(expression.BodyShouldBeOfTypeImpl(paramName, allowedType.Name));
}