public static string CreateValueList(ValueListKind kind, IEnumerable<string> values)
{
// Ideally, we could denote the list kind (and the list itself) directly in the
// message XML, and detect and expand in the MessageHandler.GenerateMessageString()
// method. Doing so would make vararg-style messages much easier, but impacts
// every single message we format. For now, callers just have to know when a
// message takes a list of values in a single string argument, the caller will
// have to do the expansion themselves. (And, unfortunately, hard-code the knowledge
// that the list is an 'and' or 'or' list.)
// For a localizable solution, we need to be able to get the list format string
// from resources. We aren't currently localized right now, so the values are
// just hard-coded.
const string valueFormat = "'{0}'";
const string valueSeparator = ", ";
string terminalTerm = String.Empty;
switch (kind)
{
case ValueListKind.None:
terminalTerm = "";
break;
case ValueListKind.And:
terminalTerm = "and ";
break;
case ValueListKind.Or:
terminalTerm = "or ";
break;
}
StringBuilder list = new StringBuilder();
// This weird construction helps us determine when we're adding the last value
// to the list. Instead of adding them as we encounter them, we cache the current
// value and append the *previous* one.
string previousValue = null;
bool haveValues = false;
foreach (string value in values)
{
if (null != previousValue)
{
if (haveValues)
{
list.Append(valueSeparator);
}
list.AppendFormat(valueFormat, previousValue);
haveValues = true;
}
previousValue = value;
}
// If we have no previous value, that means that the list contained no values, and
// something has gone very wrong.
Debug.Assert(null != previousValue);
if (null != previousValue)
{
if (haveValues)
{
list.Append(valueSeparator);
list.Append(terminalTerm);
}
list.AppendFormat(valueFormat, previousValue);
haveValues = true;
}
return list.ToString();
}
public static string CreateValueList(ValueListKind kind, params string[] values)
{
return CreateValueList(kind, (IEnumerable<string>)values);
}
