public void GetCharsTest()
{
_dt.Columns.Add("col2", typeof(char[]));
_dt.Rows.Clear();
_dt.Rows.Add(new object[] { 1, "string", "string".ToCharArray() });
_dt.Rows.Add(new object[] { 2, "string1", null });
DataTableReader rdr = _dt.CreateDataReader();
rdr.Read();
// Unable to cast object of type 'System.String' to type 'System.Char[]'.
Assert.Throws <InvalidCastException>(() => rdr.GetChars(1, 0, null, 0, 10));
char[] char_arr = null;
long len = 0;
len = rdr.GetChars(2, 0, null, 0, 0);
Assert.Equal(6, len);
char_arr = new char[len];
len = rdr.GetChars(2, 0, char_arr, 0, 0);
Assert.Equal(0, len);
len = rdr.GetChars(2, 0, null, 0, 0);
char_arr = new char[len + 2];
len = rdr.GetChars(2, 0, char_arr, 2, 100);
Assert.Equal(6, len);
char[] val = (char[])rdr.GetValue(2);
for (int i = 0; i < len; ++i)
{
Assert.Equal(val[i], char_arr[i + 2]);
}
}
private static void TestGetChars(DataTableReader reader, int bufferSize)
{
// The filename is in column 0, and the contents are in column 1.
const int FILENAME_COLUMN = 0;
const int DATA_COLUMN = 1;
char[] buffer;
long offset;
int charsRead = 0;
string fileName;
int currentBufferSize = 0;
while (reader.Read())
{
// Reinitialize the buffer size and the buffer itself.
currentBufferSize = bufferSize;
buffer = new char[bufferSize];
// For each row, write the data to the specified file.
// First, verify that the FileName column isn't null.
if (!reader.IsDBNull(FILENAME_COLUMN))
{
// Get the file name, and create a file with
// the supplied name.
fileName = reader.GetString(FILENAME_COLUMN);
// Start at the beginning.
offset = 0;
using (StreamWriter outputStream =
new StreamWriter(fileName, false))
{
try
{
// Loop through all the characters in the input field,
// incrementing the offset for the next time. If this
// pass through the loop reads characters, write them to
// the output stream.
do
{
charsRead = (int)reader.GetChars(DATA_COLUMN, offset,
buffer, 0, bufferSize);
if (charsRead > 0)
{
outputStream.Write(buffer, 0, charsRead);
offset += charsRead;
}
} while (charsRead > 0);
}
catch (Exception ex)
{
Console.WriteLine(fileName + ": " + ex.Message);
}
}
}
}
Console.WriteLine("Press Enter key to finish.");
Console.ReadLine();
}
public void GetCharsTest()
{
_dt.Columns.Add("col2", typeof(char[]));
_dt.Rows.Clear();
_dt.Rows.Add(new object[] { 1, "string", "string".ToCharArray() });
_dt.Rows.Add(new object[] { 2, "string1", null });
DataTableReader rdr = _dt.CreateDataReader();
rdr.Read();
try
{
rdr.GetChars(1, 0, null, 0, 10);
Assert.False(true);
}
catch (InvalidCastException e)
{
// Never premise English.
//Assert.Equal ("Unable to cast object of type 'System.String'" +
// " to type 'System.Char[]'.", e.Message, "#1");
}
char[] char_arr = null;
long len = 0;
len = rdr.GetChars(2, 0, null, 0, 0);
Assert.Equal(6, len);
char_arr = new char[len];
len = rdr.GetChars(2, 0, char_arr, 0, 0);
Assert.Equal(0, len);
len = rdr.GetChars(2, 0, null, 0, 0);
char_arr = new char[len + 2];
len = rdr.GetChars(2, 0, char_arr, 2, 100);
Assert.Equal(6, len);
char[] val = (char[])rdr.GetValue(2);
for (int i = 0; i < len; ++i)
{
Assert.Equal(val[i], char_arr[i + 2]);
}
}
public long GetChars(int i, long fieldOffset, char[] buffer, int bufferOffset, int length)
{
return(_reader.GetChars(i, fieldOffset, buffer, bufferOffset, length));
}