public override object Convert(object source, Type sourceType, Type targetType)
{
if (source == null)
{
return(null);
}
var sourceDict = source as IDictionary;
var len = sourceDict.Count;
// Shortcut if possible...
var copyRequired = !targetType.IsInstanceOfType(source);
if (!copyRequired && len == 0)
{
return(source);
}
var targetKeyType = ConversionUtils.GetDictionaryKeyType(targetType);
var targetValueType = ConversionUtils.GetDictionaryValueType(targetType);
var sourceKeyType = ConversionUtils.GetDictionaryKeyType(sourceType);
var sourceValueType = ConversionUtils.GetDictionaryValueType(sourceType);
var dict = ConversionUtils.CreateCompatDictionaryFor(targetType);
if (dict == null)
{
throw new InvalidOperationException("Unable to create compatable dictionary");
}
if (!targetType.IsGenericType)
{
var enumerator = sourceDict.GetEnumerator();
while (enumerator.MoveNext())
{
dict.Add(enumerator.Key, enumerator.Value);
}
}
else
{
var enumerator = sourceDict.GetEnumerator();
while (enumerator.MoveNext())
{
var targetKey = ConvertKey(enumerator.Key, sourceKeyType, targetKeyType);
var targetValue = ConvertValue(enumerator.Value, sourceValueType, targetValueType);
dict.Add(targetKey, targetValue);
}
}
return(dict);
}