public Expression GetAccessor(Expression source)
{
var result = source;
if (!string.IsNullOrEmpty(Path))
{
var dps = new Stack <DependencyPropertyPos>();
var property = new PropertyPos();
var dpp = new DependencyPropertyPos();
int index = 0;
if (Path[0] != '{')
{
property.Start = 0;
}
foreach (var c in Path)
{
if (c == '{')
{
dpp.BracketStart = index;
}
else if (c == '}')
{
dpp.BracketEnd = index;
}
else if (c == '.')
{
if (dpp.BracketEnd != null)
{
result = BuildExpression(result, ref dpp);
}
else
{
if (property.Start == null)
{
property.Start = index + 1;
}
else
{
property.End = index - 1;
result = BuildExpression(result, ref property);
}
}
}
index++;
}
if (property.Start != null)
{
property.End = index - 1;
result = BuildExpression(result, ref property);
}
else if (dpp.BracketEnd != null)
{
result = BuildExpression(result, ref dpp);
}
}
return(Expression.Convert(result, typeof(object)));
}
private Expression BuildExpression(Expression result, ref DependencyPropertyPos dpp)
{
var dp = Properties[int.Parse(Path.Substring(dpp.BracketStart.Value + 1, (dpp.BracketEnd - dpp.BracketStart).Value - 1))];
var getValueMethod = _getValueMethodGen.MakeGenericMethod(dp.PropertyType);
result = Expression.Call(result, getValueMethod, Expression.Constant(dp));
dpp.BracketStart = dpp.BracketEnd = null;
return(result);
}
