/// <summary>
/// Заполнить таблицу baseTable из файла или потока
/// </summary>
public void Fill <T>(BaseTable <T> baseTable, bool allowNulls)
{
if (baseTable == null)
{
throw new ArgumentNullException("baseTable");
}
Stream stream = null;
BinaryReader reader = null;
baseTable.Items.Clear();
PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(T));
try
{
stream = ioStream ?? new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
reader = new BinaryReader(stream);
FieldDef[] fieldDefs = ReadFieldDefs(stream, reader, out int recSize);
if (fieldDefs.Length > 0)
{
// считывание строк
byte[] rowBuf = new byte[recSize];
while (stream.Position < stream.Length)
{
// загрузка данных строки таблицы в буфер для увеличения скорости работы
int readSize = reader.Read(rowBuf, 0, recSize);
// заполение строки таблицы из буфера
if (readSize == recSize)
{
T item = Activator.CreateInstance <T>();
int bufInd = 2;
foreach (FieldDef fieldDef in fieldDefs)
{
bool isNull = fieldDef.AllowNull ? rowBuf[bufInd++] > 0 : false;
PropertyDescriptor prop = props[fieldDef.Name];
if (prop != null)
{
object val = allowNulls && isNull ?
null : BytesToObj(rowBuf, bufInd, fieldDef.DataType);
prop.SetValue(item, val);
}
bufInd += fieldDef.DataSize;
}
baseTable.AddItem(item);
}
}
}
}
catch (EndOfStreamException)
{
// нормальная ситуация окончания файла
}
finally
{
if (fileMode)
{
reader?.Close();
stream?.Close();
}
}
}
/// <summary>
/// Записать таблицу baseTable в файл или поток
/// </summary>
public void Update <T>(BaseTable <T> baseTable)
{
Update((IBaseTable)baseTable);
}
/// <summary>
/// Fill the baseTable table from a file or stream
/// </summary>
public void Fill <T>(BaseTable <T> baseTable, bool allowNulls)
{
if (baseTable == null)
{
throw new ArgumentNullException(nameof(baseTable));
}
Stream stream = null;
BinaryReader reader = null;
baseTable.Items.Clear();
var props = TypeDescriptor.GetProperties(typeof(T));
try {
stream = ioStream ?? new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
reader = new BinaryReader(stream);
FieldDef[] fieldDefs = ReadFieldDefs(stream, reader, out int recSize);
if (fieldDefs.Length > 0)
{
// read lines
var rowBuf = new byte[recSize];
while (stream.Position < stream.Length)
{
// load table row data to buffer to increase speed
int readSize = reader.Read(rowBuf, 0, recSize);
// filling the row of the table from the buffer
if (readSize == recSize)
{
var item = Activator.CreateInstance <T>();
var bufInd = 2;
foreach (var fieldDef in fieldDefs)
{
bool isNull = fieldDef.AllowNull && rowBuf[bufInd++] > 0;
var prop = props[fieldDef.Name];
if (prop != null)
{
var val = allowNulls && isNull
? null
: BytesToObj(rowBuf, bufInd, fieldDef.DataType);
prop.SetValue(item, val);
}
bufInd += fieldDef.DataSize;
}
baseTable.AddItem(item);
}
}
}
} catch (EndOfStreamException) {
// normal file end situation
} finally {
if (fileMode)
{
reader?.Close();
stream?.Close();
}
}
}
