static void ProtoWrite(DataTable table, Stream stream)
{
using (var writer = new ProtoWriter(stream, null, null))
{
// table name
if (!string.IsNullOrEmpty(table.TableName))
{
ProtoWriter.WriteFieldHeader(1, WireType.String, writer);
ProtoWriter.WriteString(table.TableName, writer);
}
// write the schema:
var cols = table.Columns;
Action <object>[] colWriters = new Action <object> [cols.Count];
int i = 0;
foreach (DataColumn col in cols)
{
// for each, write the name and data type
ProtoWriter.WriteFieldHeaderAnyType(2, WireType.StartGroup, writer);
var token = ProtoWriter.StartSubItemWithoutWritingHeader(col, writer);
ProtoWriter.WriteFieldHeader(1, WireType.String, writer);
ProtoWriter.WriteString(col.ColumnName, writer);
ProtoWriter.WriteFieldHeader(2, WireType.Variant, writer);
MappedType type;
switch (Type.GetTypeCode(col.DataType))
{
case TypeCode.Decimal: type = MappedType.Decimal; break;
case TypeCode.Int16: type = MappedType.Int16; break;
case TypeCode.Int32: type = MappedType.Int32; break;
case TypeCode.String: type = MappedType.String; break;
case TypeCode.DateTime: type = MappedType.DateTime; break;
default:
if (col.DataType == typeof(Guid))
{
type = MappedType.Guid; break;
}
throw new NotSupportedException(col.DataType.Name);
}
ProtoWriter.WriteInt32((int)type, writer);
ProtoWriter.EndSubItem(token, writer);
int field = i + 1;
Action <object> colWriter;
switch (type)
{
case MappedType.String:
colWriter = value =>
{
ProtoWriter.WriteFieldHeader(field, WireType.String, writer);
ProtoWriter.WriteString((string)value, writer);
};
break;
case MappedType.Int16:
colWriter = value =>
{
ProtoWriter.WriteFieldHeader(field, WireType.Variant, writer);
ProtoWriter.WriteInt16((short)value, writer);
};
break;
case MappedType.Decimal:
colWriter = value =>
{
ProtoWriter.WriteFieldHeader(field, WireType.StartGroup, writer);
BclHelpers.WriteDecimal((decimal)value, writer);
};
break;
case MappedType.Int32:
colWriter = value =>
{
ProtoWriter.WriteFieldHeader(field, WireType.Variant, writer);
ProtoWriter.WriteInt32((int)value, writer);
};
break;
case MappedType.Guid:
colWriter = value =>
{
ProtoWriter.WriteFieldHeader(field, WireType.StartGroup, writer);
BclHelpers.WriteGuid((Guid)value, writer);
};
break;
case MappedType.DateTime:
colWriter = value =>
{
ProtoWriter.WriteFieldHeader(field, WireType.StartGroup, writer);
BclHelpers.WriteDateTime((DateTime)value, writer);
};
break;
default:
throw new NotSupportedException(col.DataType.Name);
}
colWriters[i++] = colWriter;
}
// write the rows
foreach (DataRow row in table.Rows)
{
i = 0;
ProtoWriter.WriteFieldHeaderAnyType(3, WireType.StartGroup, writer);
var token = ProtoWriter.StartSubItemWithoutWritingHeader(row, writer);
foreach (DataColumn col in cols)
{
var value = row[col];
if (value == null || value is DBNull)
{
}
else
{
colWriters[i](value);
}
i++;
}
ProtoWriter.EndSubItem(token, writer);
}
}
}
