private static void ExportCollection(ExportContext context, NameValueCollection collection, JsonWriter writer)
{
Debug.Assert(context != null);
Debug.Assert(collection != null);
Debug.Assert(writer != null);
writer.WriteStartObject();
for (int i = 0; i < collection.Count; i++)
{
writer.WriteMember(collection.GetKey(i));
string[] values = collection.GetValues(i);
if (values == null)
{
writer.WriteNull();
}
else if (values.Length > 1)
{
context.Export(values, writer);
}
else
{
context.Export(values[0], writer);
}
}
writer.WriteEndObject();
}
internal static void ExportView(ExportContext context, DataView view, JsonWriter writer)
{
Debug.Assert(context != null);
Debug.Assert(view != null);
Debug.Assert(writer != null);
writer.WriteStartObject();
writer.WriteMember("columns");
writer.WriteStartArray();
foreach (DataColumn column in view.Table.Columns)
{
context.Export(column.ColumnName, writer);
}
writer.WriteEndArray();
writer.WriteMember("rows");
writer.WriteStartArray();
foreach (DataRowView row in view)
{
context.Export(row.Row.ItemArray, writer);
}
writer.WriteEndArray();
writer.WriteEndObject();
}
protected override void ExportValue(ExportContext context, object value, JsonWriter writer)
{
Debug.Assert(context != null);
Debug.Assert(value != null);
Debug.Assert(writer != null);
if (_properties.Count == 0)
{
writer.WriteString(value.ToString());
}
else
{
ObjectReferenceTracker tracker = null;
try
{
writer.WriteStartObject();
foreach (PropertyDescriptor property in _properties)
{
object propertyValue = property.GetValue(value);
if (!JsonNull.LogicallyEquals(propertyValue))
{
writer.WriteMember(property.Name);
if (tracker == null)
{
//
// We are about to enter a deeper scope so
// start tracking the current object being
// exported. This will help to detect
// recursive references that may occur
// through this exporter deeper in the tree.
//
tracker = TrackObject(context, value);
}
context.Export(propertyValue, writer);
}
}
writer.WriteEndObject();
}
finally
{
if (tracker != null)
{
tracker.Pop(value);
}
}
}
}
public static void Export(object value, JsonWriter writer)
{
if (writer == null)
{
throw new ArgumentNullException("writer");
}
ExportContext context = new ExportContext();
context.Export(value, writer);
}
internal static void ExportRow(ExportContext context, DataRow row, JsonWriter writer)
{
Debug.Assert(context != null);
Debug.Assert(row != null);
Debug.Assert(writer != null);
writer.WriteStartObject();
foreach (DataColumn column in row.Table.Columns)
{
writer.WriteMember(column.ColumnName);
context.Export(row[column], writer);
}
writer.WriteEndObject();
}
protected override void ExportValue(ExportContext context, object value, JsonWriter writer)
{
Debug.Assert(context != null);
Debug.Assert(value != null);
Debug.Assert(writer != null);
IEnumerable items = (IEnumerable)value;
writer.WriteStartArray();
foreach (object item in items)
{
context.Export(item, writer);
}
writer.WriteEndArray();
}
protected virtual void Export(ExportContext context, JsonWriter writer)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (writer == null)
{
throw new ArgumentNullException("writer");
}
writer.WriteStartArray();
foreach (object value in this)
{
context.Export(value, writer);
}
writer.WriteEndArray();
}
protected override void ExportValue(ExportContext context, object value, JsonWriter writer)
{
Debug.Assert(context != null);
Debug.Assert(value != null);
Debug.Assert(writer != null);
writer.WriteStartObject();
IDictionary dictionary = (IDictionary)value;
foreach (DictionaryEntry entry in dictionary)
{
writer.WriteMember(entry.Key.ToString());
context.Export(entry.Value, writer);
}
/*
* FIXME: Use IDictionaryEnumerator.Entry instead and enumerate manually (faster and more robust).
* It is faster because unboxing is avoided by going over
* IDictionaryEnumerator.Entry rather than
* IDictionaryEnumerator.Current. It is more robust because many
* people may get the implementation of IDictionary.GetEnumerator
* wrong, especially if they are implementing IDictionary<K, V> in
* 2.0. If they simply return the enumerator from the wrapped
* dictionary then Current will return KeyValuePair<K, V> instead
* of DictionaryEntry and therefore cause a casting exception.
*
* using (IDictionaryEnumerator e = dictionary.GetEnumerator())
* {
* while (e.MoveNext())
* {
* writer.WriteMember(e.Entry.Key.ToString());
* context.Export(e.Entry.Value, writer);
* }
* }
*/
writer.WriteEndObject();
}
protected virtual void Export(ExportContext context, JsonWriter writer)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (writer == null)
{
throw new ArgumentNullException("writer");
}
writer.WriteStartObject();
foreach (string name in NameIndexList)
{
writer.WriteMember(name);
context.Export(InnerHashtable[name], writer);
}
writer.WriteEndObject();
}
