/// <summary>
/// 使用指定的连接字符串和<see cref="DbProviderFactory"/>实例初始化<see cref="DbClient"/>的新实例。
/// </summary>
/// <param name="connectionString">连接字符串。</param>
/// <param name="factory"><see cref="DbProviderFactory"/>实例</param>
public DbClient(string connectionString, DbProviderFactory factory)
{
ArgAssert.NotNull(factory, nameof(factory));
ArgAssert.NotNullOrEmptyOrWhitespace(connectionString, nameof(connectionString));
_factory = factory;
ConnectionString = connectionString;
}
private ThreadLocalTransactionKeeper(DbProviderFactory dbProviderFactory, string connectionString)
{
ArgAssert.NotNull(dbProviderFactory, "dbProviderFactory");
ArgAssert.NotNullOrEmptyOrWhitespace(connectionString, "connectionString");
_factory = dbProviderFactory;
_connectionString = connectionString;
}
/// <summary>
/// 使用指定的连接字符串和<see cref="DbProviderFactory"/>工厂初始化<see cref="DbClient"/>的新实例。
/// </summary>
/// <param name="connectionString">连接字符串。</param>
/// <param name="factoryGetter">用于创建<see cref="DbProviderFactory"/>。</param>
public DbClient(string connectionString, Func <DbProviderFactory> factoryGetter)
{
ArgAssert.NotNull(factoryGetter, nameof(factoryGetter));
ArgAssert.NotNullOrEmptyOrWhitespace(connectionString, nameof(connectionString));
_factoryGetter = factoryGetter;
ConnectionString = connectionString;
}
public override int GetValues(object[] values)
{
ArgAssert.NotNull(values, nameof(values));
var num = Math.Min(values.Length, _fieldCount);
Array.Copy(_values, values, num);
return(num);
}
/// <summary>
/// 从给定的类型上解析泛型参数表，并指定解析参数时所使用的泛型类型定义。
/// </summary>
/// <param name="type">从此类型上解析泛型参数表。</param>
/// <param name="genericTypeDefinition">泛型类型定义。可以是接口，也可以是非接口类型。</param>
/// <returns>类型的泛型参数的数组，其元素顺序与类型定义的顺序一致。</returns>
/// <exception cref="ArgumentNullException"><paramref name="type"/>为<c>null</c>。</exception>
/// <exception cref="ArgumentNullException"><paramref name="genericTypeDefinition"/>为<c>null</c>。</exception>
/// <exception cref="ArgumentException"><paramref name="genericTypeDefinition"/>不是泛型类型定义。</exception>
/// <example>
/// 一个类型可以继承多个泛型类型，例如：
/// GenericClass{T} : IDictionary{T, int}, ICollection{string}
/// 此时，对于GenericClass{long}，使用泛型定义IDictionary{,}，获取参数表类型是 [long, int]；
/// 而对于泛型定义ICollection{}则结果是 [string]；
/// </example>
public static Type[] GetGenericArguments(Type type, Type genericTypeDefinition)
{
ArgAssert.NotNull(type, "type");
ArgAssert.NotNull(genericTypeDefinition, "genericTypeDefinition");
if (!genericTypeDefinition.IsGenericTypeDefinition)
{
var msg = string.Format(
"The type {0} is not a generic type definition.",
genericTypeDefinition.Name);
throw new ArgumentException(msg, "genericTypeDefinition");
}
if (genericTypeDefinition.IsInterface)
{
if (type.IsGenericType && type.GetGenericTypeDefinition() == genericTypeDefinition)
{
return(type.GetGenericArguments());
}
foreach (var interfaceType in type.GetInterfaces())
{
if (!interfaceType.IsGenericType)
{
continue;
}
if (interfaceType.GetGenericTypeDefinition() != genericTypeDefinition)
{
continue;
}
return(interfaceType.GetGenericArguments());
}
}
else
{
var baseType = type;
do
{
if (!baseType.IsGenericType)
{
continue;
}
if (baseType.GetGenericTypeDefinition() != genericTypeDefinition)
{
continue;
}
return(baseType.GetGenericArguments());
} while ((baseType = baseType.BaseType) != null);
}
return(null);
}
/// <summary>
/// 创建<see cref="ThreadLocalTransactionKeeper"/>的新实例。
/// </summary>
/// <param name="dbProviderFactory"><see cref="DbProviderFactory"/>实例。</param>
/// <param name="connectionString">初始化数据库连接的连接字符串。</param>
/// <param name="commandTimeout">
/// 指定事务内的命令的默认执行超时时间，当方法没有单独制定超时时，套用此超时值。
/// </param>
public ThreadLocalTransactionKeeper(
DbProviderFactory dbProviderFactory, string connectionString, int commandTimeout)
{
ArgAssert.NotNull(dbProviderFactory, nameof(dbProviderFactory));
ArgAssert.NotNullOrEmptyOrWhitespace(connectionString, nameof(connectionString));
Factory = dbProviderFactory;
ConnectionString = connectionString;
DefaultTimeout = commandTimeout;
}
public override int GetValues(object[] values)
{
ArgAssert.NotNull(values, "values");
var itemArray = _currentRow.ItemArray;
var len = Math.Min(itemArray.Length, values.Length);
Array.Copy(itemArray, values, len);
return(len);
}
/// <summary>
/// 返回查询语句对应查询结果的<see cref="System.Data.DataSet"/>。
/// </summary>
/// <param name="sql">查询SQL。</param>
/// <param name="parameters">参数序列。空序列或null表示没有参数。</param>
/// <param name="commandType">命令的类型。</param>
/// <param name="timeout">命令的超时时间，单位毫秒。0为不指定。</param>
/// <returns>表示查询结果的<see cref="System.Data.DataSet"/>。</returns>
/// <exception cref="ArgumentNullException">当<paramref name="sql"/>为<c>null</c>。</exception>
/// <exception cref="ArgumentException">当<paramref name="sql"/>长度为0。</exception>
public DataSet DataSet(string sql, IEnumerable <DbParameter> parameters = null,
CommandType commandType = CommandType.Text, int timeout = 0)
{
ArgAssert.NotNullOrEmpty(sql, "sql");
var ds = new DataSet();
FillDataSet(ds, sql, parameters, commandType, timeout);
return(ds);
}
public TransactionScopeTransactionKeeper(DbProviderFactory dbProviderFactory, string connectionString)
{
ArgAssert.NotNull(dbProviderFactory, "dbProviderFactory");
ArgAssert.NotNullOrEmptyOrWhitespace(connectionString, "connectionString");
_factory = dbProviderFactory;
_connectionString = connectionString;
//鉴于应用场景，直接开启事务控制（不过数据库连接还没初始化）
_tran = new TransactionScope();
}
/// <summary>
/// 初始化类型的新实例。
/// </summary>
/// <param name="dbProviderFactory"><see cref="DbProviderFactory"/>的实例。</param>
/// <param name="connectionString">指定数据库的连接字符串。</param>
/// <param name="commandTimeout">
/// 指定事务内的命令的默认执行超时时间，当方法没有单独制定超时时，套用此超时值。
/// </param>
public TransactionScopeTransactionKeeper(
DbProviderFactory dbProviderFactory, string connectionString, int commandTimeout)
{
ArgAssert.NotNull(dbProviderFactory, "dbProviderFactory");
ArgAssert.NotNullOrEmptyOrWhitespace(connectionString, "connectionString");
Factory = dbProviderFactory;
ConnectionString = connectionString;
DefaultTimeout = commandTimeout;
//鉴于应用场景，直接开启事务控制（不过数据库连接还没初始化）
_tran = new TransactionScope();
}
public virtual int GetValues(object[] values)
{
ArgAssert.NotNull(values, "values");
var num = Math.Min(values.Length, FieldCount);
for (int i = 0; i <= num; i++)
{
values[i] = GetValue(i);
}
return(num);
}
/// <summary>
/// 获取查询结果得行序列。
/// </summary>
/// <param name="sql">查询SQL。</param>
/// <param name="parameters">参数序列。空序列或null表示没有参数。</param>
/// <param name="commandType">命令的类型。</param>
/// <param name="timeout">命令的超时时间，单位毫秒。0为不指定。</param>
/// <returns>查询结果得行序列。</returns>
public IEnumerable <IDataRecord> Rows(string sql, IEnumerable <DbParameter> parameters = null,
CommandType commandType = CommandType.Text, int timeout = 0)
{
ArgAssert.NotNullOrEmpty(sql, "sql");
DbConnection connection = null;
DbDataReader reader = null;
DbCommand cmd;
try
{
connection = CreateAndOpenConnection();
cmd = CreateCommand(sql, connection, parameters, commandType, timeout);
reader = cmd.ExecuteReader();
}
catch (Exception ex)
{
throw new SqlExecutingException(sql, commandType, parameters, ex);
}
finally
{
//获取reader失败时，关闭连接
if (reader == null && connection != null)
{
CloseConnection(connection);
}
}
try
{
cmd.Parameters.Clear();
while (reader.Read())
{
yield return(reader);
}
}
finally
{
if (!reader.IsClosed)
{
reader.Close();
}
if (connection != null)
{
CloseConnection(connection);
}
}
}
public object[] MapRow(IDataRecord record, int rowNum)
{
ArgAssert.NotNull(record, nameof(record));
var len = record.FieldCount;
var array = new object[len];
for (int i = 0; i < len; i++)
{
array[i] = record[i];
}
return(array);
}
/// <summary>
/// 使用<see cref="IMapper{T}"/>查询指定对象的集合。
/// </summary>
/// <typeparam name="T">查询的目标类型。</typeparam>
/// <param name="mapper"><see cref="IMapper{T}"/>的实例。</param>
/// <param name="sql">查询SQL。</param>
/// <param name="parameters">参数序列。空序列或null表示没有参数。</param>
/// <param name="commandType">命令的类型。</param>
/// <param name="timeout">命令的超时时间，单位毫秒。0为不指定。</param>
/// <returns>目标类型的实例的集合。若查询命中的行数为0，返回空集合。</returns>
public IList <T> List <T>(IMapper <T> mapper,
string sql, IEnumerable <DbParameter> parameters = null,
CommandType commandType = CommandType.Text, int timeout = 0)
{
ArgAssert.NotNullOrEmpty(sql, "sql");
ArgAssert.NotNull(mapper, "mapper");
var results = new List <T>();
DbConnection connection = null;
DbCommand cmd = null;
IDataReader reader = null;
try
{
connection = CreateAndOpenConnection();
cmd = CreateCommand(sql, connection, parameters, commandType, timeout);
reader = cmd.ExecuteReader();
var rowCount = 0;
while (reader.Read())
{
var row = mapper.MapRow(reader, ++rowCount);
results.Add(row);
}
}
catch (Exception ex)
{
throw new SqlExecutingException(sql, commandType, parameters, ex);
}
finally
{
if (cmd != null)
{
cmd.Parameters.Clear();
}
if (reader != null && !reader.IsClosed)
{
reader.Close();
}
if (connection != null)
{
CloseConnection(connection);
}
}
return(results);
}
/// <summary>
/// 使用<see cref="IMapper{T}"/>查询指定对象。
/// SQL命中的记录必须为1行，否则抛出异常。
/// </summary>
/// <typeparam name="T">查询的目标类型。</typeparam>
/// <param name="mapper"><see cref="IMapper{T}"/>的实例。</param>
/// <param name="sql">查询SQL。</param>
/// <param name="parameters">参数序列。空序列或null表示没有参数。</param>
/// <param name="commandType">命令的类型。</param>
/// <param name="timeout">命令的超时时间，单位毫秒。0表示不指定，此时套用默认的超时设置。</param>
/// <returns>目标类型的实例。</returns>
/// <exception cref="IncorrectResultSizeException">当SQL命中的记录行数不为 1。</exception>
public virtual T ForceGet <T>(IMapper <T> mapper,
string sql, IEnumerable <DbParameter> parameters = null,
CommandType commandType = CommandType.Text, int timeout = 0)
{
ArgAssert.NotNullOrEmpty(sql, nameof(sql));
ArgAssert.NotNull(mapper, nameof(mapper));
DbConnection connection = null;
IDataReader reader = null;
DbCommand cmd = null;
try
{
connection = CreateAndOpenConnection();
cmd = CreateCommand(sql, connection, parameters, commandType, timeout);
reader = cmd.ExecuteReader();
int rowCount;
T result;
if (DbClientHelper.TryMapUniqueRow(reader, mapper, out result, out rowCount))
{
return(result);
}
throw new IncorrectResultSizeException(sql, CommandType.Text, parameters, 1, rowCount);
}
catch (Exception ex)
{
throw new SqlExecutingException(sql, commandType, parameters, ex);
}
finally
{
cmd?.Parameters.Clear();
if (reader != null && !reader.IsClosed)
{
reader.Close();
}
if (connection != null)
{
CloseConnection(connection);
}
}
}
/// <summary>
/// 使用<see cref="IMapper{T}"/>查询指定对象的集合。
/// 若查询未命中纪录，返回空集（长度为0，不是null）。
/// 这是一个异步操作。
/// </summary>
/// <typeparam name="T">查询的目标类型。</typeparam>
/// <param name="mapper"><see cref="IMapper{T}"/>的实例。</param>
/// <param name="sql">查询SQL。</param>
/// <param name="parameters">参数序列。空序列或null表示没有参数。</param>
/// <param name="commandType">命令的类型。</param>
/// <param name="timeout">命令的超时时间，单位毫秒。0表示不指定，此时套用默认的超时设置。</param>
/// <returns>目标类型的实例的集合。若查询命中的行数为0，返回空集合。</returns>
public virtual async Task <IList <T> > ListAsync <T>(IMapper <T> mapper,
string sql, IEnumerable <DbParameter> parameters = null,
CommandType commandType = CommandType.Text, int timeout = 0)
{
if (!AsyncEnabled)
{
return(List(mapper, sql, parameters, commandType, timeout));
}
ArgAssert.NotNullOrEmpty(sql, nameof(sql));
ArgAssert.NotNull(mapper, nameof(mapper));
DbConnection connection = null;
DbCommand cmd = null;
IDataReader reader = null;
try
{
connection = await CreateAndOpenConnectionAsync();
cmd = CreateCommand(sql, connection, parameters, commandType, timeout);
reader = await cmd.ExecuteReaderAsync();
return(MapRowsToList(reader, mapper));
}
catch (Exception ex)
{
throw new SqlExecutingException(sql, commandType, parameters, ex);
}
finally
{
cmd?.Parameters.Clear();
if (reader != null && !reader.IsClosed)
{
reader.Close();
}
if (connection != null)
{
CloseConnection(connection);
}
}
}
/// <summary>
/// 初始化<see cref="SingleRowKeeper"/>的新实例，并制定提供记录数据的<see cref="IDataRecord"/>。
/// </summary>
/// <param name="dataRecord">
/// <see cref="IDataRecord"/>的实例，其第一行数据将被记录下来。
/// </param>
public SingleRowKeeper(IDataRecord dataRecord)
{
ArgAssert.NotNull(dataRecord, nameof(dataRecord));
var fieldCount = dataRecord.FieldCount;
_fieldCount = fieldCount;
// keep meta data & values
_values = new object[fieldCount];
_fieldTypes = new Type[fieldCount];
_columnNames = new string[fieldCount];
for (int i = 0; i < fieldCount; i++)
{
_values[i] = dataRecord.GetValue(i);
_fieldTypes[i] = dataRecord.GetFieldType(i);
_columnNames[i] = dataRecord.GetName(i);
}
}
/// <summary>
/// 判断给定的类型是否是匿名类型。
/// </summary>
/// <param name="type">待判断的类型。</param>
/// <returns>true若给定的类型是匿名类型；否则为false。</returns>
public static bool IsAnonymousType(Type type)
{
ArgAssert.NotNull(type, "type");
if (!type.IsGenericType)
{
return(false);
}
if (!Attribute.IsDefined(type, typeof(CompilerGeneratedAttribute), false))
{
return(false);
}
if ((type.Attributes & TypeAttributes.NotPublic) != TypeAttributes.NotPublic)
{
return(false);
}
return(type.Name.Contains("AnonymousType"));
}
/// <summary>
/// 返回查询语句对应查询结果的<see cref="System.Data.DataTable"/>。
/// 这是一个异步操作。
/// </summary>
/// <param name="sql">查询SQL。</param>
/// <param name="parameters">参数序列。空序列或null表示没有参数。</param>
/// <param name="commandType">命令的类型。</param>
/// <param name="timeout">命令的超时时间，单位毫秒。0表示不指定，此时套用默认的超时设置。</param>
/// <returns>表示查询结果的<see cref="System.Data.DataTable"/>。</returns>
/// <exception cref="ArgumentNullException">当<paramref name="sql"/>为<c>null</c>。</exception>
/// <exception cref="ArgumentException">当<paramref name="sql"/>长度为0。</exception>
public virtual async Task <DataTable> DataTableAsync(string sql, IEnumerable <DbParameter> parameters = null,
CommandType commandType = CommandType.Text, int timeout = 0)
{
if (!AsyncEnabled)
{
return(DataTable(sql, parameters, commandType, timeout));
}
ArgAssert.NotNullOrEmpty(sql, nameof(sql));
DbConnection connection = null;
DbCommand cmd = null;
try
{
connection = await CreateAndOpenConnectionAsync();
cmd = CreateCommand(sql, connection, parameters, commandType, timeout);
// TODO 目前还没有找到适当的异步填充 DataTable 的方法，填充部分目前以非异步方式执行。
// dataTable.Load(reader) 在 mysql 的部分类型字段（比如longtext）将出现异常，必须通过 mysql
// 的 connector library 提供的 MySqlDataAdapter 填充，解决方案尚不清晰。
return(FillDataTable(cmd));
}
catch (Exception ex)
{
throw new SqlExecutingException(sql, commandType, parameters, ex);
}
finally
{
cmd?.Parameters.Clear();
if (connection != null)
{
CloseConnection(connection);
}
}
}
/// <summary>
/// 获取查询结果得行序列。
/// 这是一个异步操作。
/// </summary>
/// <param name="sql">查询SQL。</param>
/// <param name="parameters">参数序列。空序列或null表示没有参数。</param>
/// <param name="commandType">命令的类型。</param>
/// <param name="timeout">命令的超时时间，单位毫秒。0表示不指定，此时套用默认的超时设置。</param>
/// <returns>查询结果得行序列。</returns>
public virtual async Task <IEnumerable <IDataRecord> > RowsAsync(string sql, IEnumerable <DbParameter> parameters = null,
CommandType commandType = CommandType.Text, int timeout = 0)
{
if (!AsyncEnabled)
{
return(Rows(sql, parameters, commandType, timeout));
}
ArgAssert.NotNullOrEmpty(sql, nameof(sql));
DbConnection connection = null;
DbDataReader reader = null;
DbCommand cmd = null;
try
{
connection = await CreateAndOpenConnectionAsync();
cmd = CreateCommand(sql, connection, parameters, commandType, timeout);
reader = await cmd.ExecuteReaderAsync();
}
catch (Exception ex)
{
throw new SqlExecutingException(sql, commandType, parameters, ex);
}
finally
{
cmd?.Parameters.Clear();
//获取reader失败时，关闭连接
if (reader == null && connection != null)
{
CloseConnection(connection);
}
}
return(YieldRows(connection, reader));
}
/// <summary>
/// 返回查询语句对应查询结果的<see cref="System.Data.DataSet"/>。
/// 这是一个异步操作。
/// </summary>
/// <param name="sql">查询SQL。</param>
/// <param name="parameters">参数序列。空序列或null表示没有参数。</param>
/// <param name="commandType">命令的类型。</param>
/// <param name="timeout">命令的超时时间，单位毫秒。0表示不指定，此时套用默认的超时设置。</param>
/// <returns>表示查询结果的<see cref="System.Data.DataSet"/>。</returns>
/// <exception cref="ArgumentNullException">当<paramref name="sql"/>为<c>null</c>。</exception>
/// <exception cref="ArgumentException">当<paramref name="sql"/>长度为0。</exception>
public virtual async Task <DataSet> DataSetAsync(string sql, IEnumerable <DbParameter> parameters = null,
CommandType commandType = CommandType.Text, int timeout = 0)
{
if (!AsyncEnabled)
{
return(DataSet(sql, parameters, commandType, timeout));
}
ArgAssert.NotNullOrEmpty(sql, nameof(sql));
DbConnection connection = null;
DbCommand cmd = null;
try
{
connection = await CreateAndOpenConnectionAsync();
cmd = CreateCommand(sql, connection, parameters, commandType, timeout);
// TODO 目前还没有找到适当的异步填充 DataSet 的方法，填充部分目前以非异步方式执行。
// 主要因为 DbDataAdaper 没有提供异步的方法，而如何从 IDataReader 获得 DataSet还没搞清楚。
return(FillDataSet(cmd));
}
catch (Exception ex)
{
throw new SqlExecutingException(sql, commandType, parameters, ex);
}
finally
{
cmd?.Parameters.Clear();
if (connection != null)
{
CloseConnection(connection);
}
}
}
/// <summary>
/// 使用<see cref="IMapper{T}"/>查询指定对象。
/// 若满足条件的记录不存在，返回目标类型的默认值（对于引用类型为<c>null</c>）。
/// </summary>
/// <typeparam name="T">查询的目标类型。</typeparam>
/// <param name="sql">查询SQL。</param>
/// <param name="parameters">参数序列。空序列或null表示没有参数。</param>
/// <param name="commandType">命令的类型。</param>
/// <param name="timeout">命令的超时时间，单位毫秒。0表示不指定，此时套用默认的超时设置。</param>
/// <param name="mapper"><see cref="IMapper{T}"/>的实例。</param>
/// <returns>目标类型的实例。</returns>
public virtual T Get <T>(IMapper <T> mapper, string sql, IEnumerable <DbParameter> parameters = null,
CommandType commandType = CommandType.Text, int timeout = 0)
{
ArgAssert.NotNullOrEmpty(sql, nameof(sql));
ArgAssert.NotNull(mapper, nameof(mapper));
DbConnection connection = null;
IDataReader reader = null;
DbCommand cmd = null;
try
{
connection = CreateAndOpenConnection();
cmd = CreateCommand(sql, connection, parameters, commandType, timeout);
reader = cmd.ExecuteReader();
return(reader.Read() ? mapper.MapRow(reader, 1) : default(T));
}
catch (Exception ex)
{
throw new SqlExecutingException(sql, commandType, parameters, ex);
}
finally
{
cmd?.Parameters.Clear();
if (reader != null && !reader.IsClosed)
{
reader.Close();
}
if (connection != null)
{
CloseConnection(connection);
}
}
}
/// <summary>
/// 创建类型的新实例。
/// </summary>
protected DbProviderFactoryWrapper(DbProviderFactory underlyingProvider)
{
ArgAssert.NotNull(underlyingProvider, nameof(underlyingProvider));
_underlyingProvider = underlyingProvider;
}
/// <summary>
/// 使用指定的数据库类型和连接字符串初始化<see cref="SqlDbClient"/>的新实例。
/// </summary>
/// <param name="connectionString">连接字符串。</param>
public MysqlDbClient(string connectionString)
{
ArgAssert.NotNullOrEmptyOrWhitespace(connectionString, "connectionString");
ConnectionString = connectionString;
}
/// <summary>
/// 通过委托定义创建<see cref="IMapper{T}"/>实现。
/// </summary>
/// <typeparam name="T">目标类型。</typeparam>
/// <param name="rowMapping">从<see cref="IDataRecord"/>获取目标类型的数据的方法。</param>
/// <returns><see cref="IMapper{T}"/>的实例。</returns>
/// <exception cref="ArgumentNullException">当<paramref name="rowMapping"/>为null。</exception>
public static IMapper <T> Custom <T>(Func <IDataRecord, int, T> rowMapping)
{
ArgAssert.NotNull(rowMapping, "rowMapping");
return(new FunctionMapper <T>(rowMapping));
}
/// <summary>
/// 判断给定类型是否是<see cref="System.Nullable{T}"/>的实例。
/// </summary>
/// <param name="t">类型。</param>
/// <returns>若类型为<see cref="System.Nullable{T}"/>，返回<c>true</c>；否则返回<c>false</c>。</returns>
/// <exception cref="ArgumentNullException">当<paramref name="t"/>为<c>null</c>。</exception>
public static bool IsNullableType(Type t)
{
ArgAssert.NotNull(t, "t");
return(t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable <>));
}
/// <summary>
/// 判断给定类型是否可被赋值为null。
/// </summary>
/// <param name="t">类型。</param>
/// <returns>若类型为引用类型，返回<c>true</c>；否则返回<c>false</c>。</returns>
/// <exception cref="ArgumentNullException">当<paramref name="t"/>为<c>null</c>。</exception>
public static bool IsNullable(Type t)
{
ArgAssert.NotNull(t, "t");
return(!t.IsValueType || IsNullableType(t));
}
public override Type GetFieldType(int i)
{
ArgAssert.Between(i, "i", 0, _fieldCount);
return(_fieldTypes[i]);
}
public override string GetName(int i)
{
ArgAssert.Between(i, "i", 0, _fieldCount);
return(_columnNames[i]);
}
public override object GetValue(int i)
{
ArgAssert.Between(i, "i", 0, _fieldCount);
return(_values[i]);
}
