public override object ReadJson(
JsonReader reader,
Type objectType,
object existingValue,
JsonSerializer serializer)
{
if (reader.TokenType == JsonToken.Null)
{
return((object)null);
}
DataTable dt = existingValue as DataTable ?? (objectType == typeof(DataTable)
? new DataTable()
: (DataTable)Activator.CreateInstance(objectType));
if (reader.TokenType == JsonToken.PropertyName)
{
dt.TableName = (string)reader.Value;
reader.ReadAndAssert();
if (reader.TokenType == JsonToken.Null)
{
return((object)dt);
}
}
if (reader.TokenType != JsonToken.StartArray)
{
throw JsonSerializationException.Create(reader,
"Unexpected JSON token when reading DataTable. Expected StartArray, got {0}.".FormatWith(
(IFormatProvider)CultureInfo.InvariantCulture, (object)reader.TokenType));
}
reader.ReadAndAssert();
while (reader.TokenType != JsonToken.EndArray)
{
DataTableConverter.CreateRow(reader, dt, serializer);
reader.ReadAndAssert();
}
return((object)dt);
}
private static void CreateRow(JsonReader reader, DataTable dt, JsonSerializer serializer)
{
DataRow row = dt.NewRow();
reader.ReadAndAssert();
while (reader.TokenType == JsonToken.PropertyName)
{
string columnName = (string)reader.Value;
reader.ReadAndAssert();
DataColumn column = dt.Columns[columnName];
if (column == null)
{
Type columnDataType = DataTableConverter.GetColumnDataType(reader);
column = new DataColumn(columnName, columnDataType);
dt.Columns.Add(column);
}
if (column.DataType == typeof(DataTable))
{
if (reader.TokenType == JsonToken.StartArray)
{
reader.ReadAndAssert();
}
DataTable dt1 = new DataTable();
while (reader.TokenType != JsonToken.EndArray)
{
DataTableConverter.CreateRow(reader, dt1, serializer);
reader.ReadAndAssert();
}
row[columnName] = (object)dt1;
}
else if (column.DataType.IsArray && column.DataType != typeof(byte[]))
{
if (reader.TokenType == JsonToken.StartArray)
{
reader.ReadAndAssert();
}
List <object> objectList = new List <object>();
while (reader.TokenType != JsonToken.EndArray)
{
objectList.Add(reader.Value);
reader.ReadAndAssert();
}
Array instance = Array.CreateInstance(column.DataType.GetElementType(), objectList.Count);
((ICollection)objectList).CopyTo(instance, 0);
row[columnName] = (object)instance;
}
else
{
object obj = reader.Value != null
? serializer.Deserialize(reader, column.DataType) ?? (object)DBNull.Value
: (object)DBNull.Value;
row[columnName] = obj;
}
reader.ReadAndAssert();
}
row.EndEdit();
dt.Rows.Add(row);
}