protected override Expression VisitBinary(BinaryExpression node)
{
if (QueryCollection.ContainsKey(Context))
{
Append(" and ");
}
Visit(node.Left);
Append(" ");
switch (node.NodeType)
{
case ExpressionType.Equal:
Append("eq");
break;
case ExpressionType.NotEqual:
Append("ne");
break;
case ExpressionType.GreaterThan:
Append("gt");
break;
case ExpressionType.GreaterThanOrEqual:
Append("ge");
break;
case ExpressionType.LessThan:
Append("lt");
break;
case ExpressionType.LessThanOrEqual:
Append("le");
break;
/*case ExpressionType.AndAlso:
* case ExpressionType.And:
* Append("and");
* break;*/
case ExpressionType.OrElse:
Append("or");
break;
case ExpressionType.Not:
Append("not");
break;
}
Append(" ");
Visit(node.Right);
return(node);
}
private void Append(string value)
{
if (string.IsNullOrEmpty(Context))
{
throw new Exception("OData expression must have a context.");
}
if (!QueryCollection.ContainsKey(Context))
{
QueryCollection.Add(Context, value);
}
else
{
QueryCollection[Context] += value;
}
}
public ODataQuery GetQuery()
{
var query = new ODataQuery();
if (QueryCollection.ContainsKey("filter"))
{
query.Filter = QueryCollection["filter"];
}
if (QueryCollection.ContainsKey("take"))
{
query.Take = int.Parse(QueryCollection["take"]);
}
return(query);
}
private void Decode()
{
var fields = this.GetType().GetProperties().ToList();
foreach (var fieldInfo in fields)
{
try
{
if (QueryCollection.ContainsKey(fieldInfo.Name.ToLower()))
{
fieldInfo.SetValue(this, Convert.ChangeType(QueryCollection[fieldInfo.Name.ToLower()], fieldInfo.PropertyType));
}
}
catch { }
}
if (!string.IsNullOrEmpty(ConnectionData))
{
ConnectionDatas = JsonConvert.DeserializeObject <List <ConnectionDataParameter> >(ConnectionData);
}
}
