private bool AddParameterToContext(UriBuildingContext context, string key, object value, bool wroteFirst)
{
var converted = Convert.ToString(value, CultureInfo.InvariantCulture);
if (!string.IsNullOrEmpty(converted))
{
context.Writer.Write(wroteFirst ? '&' : '?');
_urlEncoder.Encode(context.Writer, key);
context.Writer.Write('=');
_urlEncoder.Encode(context.Writer, converted);
return true;
}
return false;
}
private string BindValues(UriBuildingContext context, RouteValueDictionary acceptedValues)
{
for (var i = 0; i < _template.Segments.Count; i++)
{
Debug.Assert(context.BufferState == SegmentState.Beginning);
Debug.Assert(context.UriState == SegmentState.Beginning);
var segment = _template.Segments[i];
for (var j = 0; j < segment.Parts.Count; j++)
{
var part = segment.Parts[j];
if (part.IsLiteral)
{
if (!context.Accept(part.Text))
{
return null;
}
}
else if (part.IsParameter)
{
// If it's a parameter, get its value
object value;
var hasValue = acceptedValues.TryGetValue(part.Name, out value);
if (hasValue)
{
acceptedValues.Remove(part.Name);
}
var isSameAsDefault = false;
object defaultValue;
if (_defaults != null && _defaults.TryGetValue(part.Name, out defaultValue))
{
if (RoutePartsEqual(value, defaultValue))
{
isSameAsDefault = true;
}
}
var converted = Convert.ToString(value, CultureInfo.InvariantCulture);
if (isSameAsDefault)
{
// If the accepted value is the same as the default value buffer it since
// we won't necessarily add it to the URI we generate.
if (!context.Buffer(converted))
{
return null;
}
}
else
{
// If the value is not accepted, it is null or empty value in the
// middle of the segment. We accept this if the parameter is an
// optional parameter and it is preceded by an optional seperator.
// I this case, we need to remove the optional seperator that we
// have added to the URI
// Example: template = {id}.{format?}. parameters: id=5
// In this case after we have generated "5.", we wont find any value
// for format, so we remove '.' and generate 5.
if (!context.Accept(converted))
{
if (j != 0 && part.IsOptional && segment.Parts[j - 1].IsOptionalSeperator)
{
context.Remove(segment.Parts[j - 1].Text);
}
else
{
return null;
}
}
}
}
}
context.EndSegment();
}
// Generate the query string from the remaining values
var wroteFirst = false;
foreach (var kvp in acceptedValues)
{
if (_defaults != null && _defaults.ContainsKey(kvp.Key))
{
// This value is a 'filter' we don't need to put it in the query string.
continue;
}
var values = kvp.Value as IEnumerable;
if (values != null && !(values is string))
{
foreach (var value in values)
{
wroteFirst |= AddParameterToContext(context, kvp.Key, value, wroteFirst);
}
}
else
{
wroteFirst |= AddParameterToContext(context, kvp.Key, kvp.Value, wroteFirst);
}
}
return context.ToString();
}
