SqlDataReader 類別

定義

提供從 SQL Server 資料庫中讀取順向資料流資料列的方式。Provides a way of reading a forward-only stream of rows from a SQL Server database. 此類別無法獲得繼承。This class cannot be inherited.

public ref class SqlDataReader : System::Data::Common::DbDataReader, IDisposable, System::Data::Common::IDbColumnSchemaGenerator
public ref class SqlDataReader : System::Data::Common::DbDataReader, IDisposable
public ref class SqlDataReader sealed : MarshalByRefObject, IDisposable, System::Collections::IEnumerable, System::Data::IDataReader
public class SqlDataReader : System.Data.Common.DbDataReader, IDisposable, System.Data.Common.IDbColumnSchemaGenerator
public class SqlDataReader : System.Data.Common.DbDataReader, IDisposable
public sealed class SqlDataReader : MarshalByRefObject, IDisposable, System.Collections.IEnumerable, System.Data.IDataReader
type SqlDataReader = class
    inherit DbDataReader
    interface IDisposable
    interface IDbColumnSchemaGenerator
type SqlDataReader = class
    inherit DbDataReader
    interface IDisposable
type SqlDataReader = class
    inherit MarshalByRefObject
    interface IEnumerable
    interface IDataReader
    interface IDisposable
    interface IDataRecord
type SqlDataReader = class
    inherit DbDataReader
    interface IDataReader
    interface IDisposable
    interface IDataRecord
Public Class SqlDataReader
Inherits DbDataReader
Implements IDbColumnSchemaGenerator, IDisposable
Public Class SqlDataReader
Inherits DbDataReader
Implements IDisposable
Public NotInheritable Class SqlDataReader
Inherits MarshalByRefObject
Implements IDataReader, IDisposable, IEnumerable
繼承
SqlDataReader
繼承
繼承
SqlDataReader
實作

範例

下列範例會建立 SqlConnectionSqlCommandSqlDataReaderThe following example creates a SqlConnection, a SqlCommand, and a SqlDataReader. 此範例會讀取資料,並將其寫入至主控台視窗。The example reads through the data, writing it out to the console window. 然後,程式碼會關閉 SqlDataReaderThe code then closes the SqlDataReader. SqlConnection會在程式碼區塊的結尾自動關閉 usingThe SqlConnection is closed automatically at the end of the using code block.

using System;
using System.Data;
using System.Data.SqlClient;

class Program
{
    static void Main()
    {
        string str = "Data Source=(local);Initial Catalog=Northwind;"
            + "Integrated Security=SSPI";
        ReadOrderData(str);
    }

    private static void ReadOrderData(string connectionString)
    {
        string queryString =
            "SELECT OrderID, CustomerID FROM dbo.Orders;";

        using (SqlConnection connection =
                   new SqlConnection(connectionString))
        {
            SqlCommand command =
                new SqlCommand(queryString, connection);
            connection.Open();

            SqlDataReader reader = command.ExecuteReader();

            // Call Read before accessing data.
            while (reader.Read())
            {
                ReadSingleRow((IDataRecord)reader);
            }

            // Call Close when done reading.
            reader.Close();
        }
    }

    private static void ReadSingleRow(IDataRecord record)
    {
        Console.WriteLine(String.Format("{0}, {1}", record[0], record[1]));
    }
}
Option Explicit On
Option Strict On

Imports System.Data
Imports System.Data.SqlClient

Module Module1

    Sub Main()
        Dim str As String = "Data Source=(local);Initial Catalog=Northwind;" _
       & "Integrated Security=SSPI;"
        ReadOrderData(str)
    End Sub

    Private Sub ReadOrderData(ByVal connectionString As String)
        Dim queryString As String = _
            "SELECT OrderID, CustomerID FROM dbo.Orders;"

        Using connection As New SqlConnection(connectionString)
            Dim command As New SqlCommand(queryString, connection)
            connection.Open()

            Dim reader As SqlDataReader = command.ExecuteReader()

            ' Call Read before accessing data.
            While reader.Read()
                ReadSingleRow(CType(reader, IDataRecord))
            End While

            ' Call Close when done reading.
            reader.Close()
        End Using
    End Sub

    Private Sub ReadSingleRow(ByVal record As IDataRecord)
       Console.WriteLine(String.Format("{0}, {1}", record(0), record(1)))

    End Sub

End Module

備註

若要建立 SqlDataReader ,您必須呼叫 ExecuteReader 物件的方法 SqlCommand ,而不是直接使用的函式。To create a SqlDataReader, you must call the ExecuteReader method of the SqlCommand object, instead of directly using a constructor.

SqlDataReader 正在使用時,相關聯的 SqlConnection 會忙於服務 SqlDataReader ,而且不會在關閉它的情況下執行其他作業 SqlConnectionWhile the SqlDataReader is being used, the associated SqlConnection is busy serving the SqlDataReader, and no other operations can be performed on the SqlConnection other than closing it. 在呼叫的方法之前,會發生這種情況 Close SqlDataReaderThis is the case until the Close method of the SqlDataReader is called. 例如,在呼叫之後,您就無法取得輸出參數 CloseFor example, you cannot retrieve output parameters until after you call Close.

正在讀取資料時,SqlDataReader 使用者會看到另一個處理序或執行緒對結果集所進行的變更。Changes made to a result set by another process or thread while data is being read may be visible to the user of the SqlDataReader. 但精確的行為取決於時間點。However, the precise behavior is timing dependent.

IsClosedRecordsAffected 是在關閉 SqlDataReader 後唯一可呼叫的屬性。IsClosed and RecordsAffected are the only properties that you can call after the SqlDataReader is closed. 雖然 RecordsAffected 屬性可以在存在時存取 SqlDataReader ,但一定要先呼叫, Close 再傳回的值, RecordsAffected 以保證正確的傳回值。Although the RecordsAffected property may be accessed while the SqlDataReader exists, always call Close before returning the value of RecordsAffected to guarantee an accurate return value.

當使用順序存取 (CommandBehavior.SequentialAccess) 時, InvalidOperationException 如果 SqlDataReader 位置是 advanced,而在上一個資料行嘗試另一個讀取作業,則會引發。When using sequential access (CommandBehavior.SequentialAccess), an InvalidOperationException will be raised if the SqlDataReader position is advanced and another read operation is attempted on the previous column.

注意

為了達到最佳效能,請 SqlDataReader 避免建立不必要的物件,或建立不必要的資料複本。For optimal performance, SqlDataReader avoids creating unnecessary objects or making unnecessary copies of data. 因此,多個方法呼叫(例如)會傳回 GetValue 相同物件的參考。Therefore, multiple calls to methods such as GetValue return a reference to the same object. 如果您要修改方法(例如)所傳回之物件的基礎值,請務必小心 GetValueUse caution if you are modifying the underlying value of the objects returned by methods such as GetValue.

屬性

Connection

取得與 SqlConnection 相關聯的 SqlDataReaderGets the SqlConnection associated with the SqlDataReader.

Depth

取得值,表示目前資料列的巢狀深度。Gets a value that indicates the depth of nesting for the current row.

FieldCount

取得目前資料列中的資料行數目。Gets the number of columns in the current row.

HasRows

取得值,指出 SqlDataReader 是否包含一個或多個資料列。Gets a value that indicates whether the SqlDataReader contains one or more rows.

IsClosed

擷取布林值,指出指定的 SqlDataReader 執行個體是否已關閉。Retrieves a Boolean value that indicates whether the specified SqlDataReader instance has been closed.

Item[Int32]

提供資料行序數,取得使用原生格式的指定資料行值。Gets the value of the specified column in its native format given the column ordinal.

Item[String]

提供資料行名稱,取得使用原生格式的指定資料行值。Gets the value of the specified column in its native format given the column name.

RecordsAffected

取得 Transact-SQL 陳述式的執行所變更、插入或刪除的資料列數目。Gets the number of rows changed, inserted, or deleted by execution of the Transact-SQL statement.

VisibleFieldCount

取得 SqlDataReader 中沒有隱藏的欄位數。Gets the number of fields in the SqlDataReader that are not hidden.

方法

Close()

關閉 SqlDataReader 物件。Closes the SqlDataReader object.

Close()

關閉 DbDataReader 物件。Closes the DbDataReader object.

(繼承來源 DbDataReader)
CloseAsync()

非同步關閉 DbDataReader 物件。Asynchronously closes the DbDataReader object.

(繼承來源 DbDataReader)
CreateObjRef(Type)

建立包含所有相關資訊的物件,這些資訊是產生用來與遠端物件通訊的所需 Proxy。Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object.

(繼承來源 MarshalByRefObject)
Dispose()

釋放 DbDataReader 類別目前的執行個體所使用的全部資源。Releases all resources used by the current instance of the DbDataReader class.

(繼承來源 DbDataReader)
Dispose(Boolean)

釋放 DbDataReader 所使用的 Unmanaged 資源,並選擇性地釋放 Managed 資源。Releases the unmanaged resources used by the DbDataReader and optionally releases the managed resources.

(繼承來源 DbDataReader)
DisposeAsync()

以非同步方式將 DbDataReader 類別的目前執行個體所使用所有資源釋出。Asynchronously releases all resources used by the current instance of the DbDataReader class.

(繼承來源 DbDataReader)
Equals(Object)

判斷指定的物件是否等於目前的物件。Determines whether the specified object is equal to the current object.

(繼承來源 Object)
GetBoolean(Int32)

取得指定之資料行的值做為布林值 (Boolean)。Gets the value of the specified column as a Boolean.

GetByte(Int32)

取得指定資料行的值做為位元組。Gets the value of the specified column as a byte.

GetBytes(Int32, Int64, Byte[], Int32, Int32)

從指定資料行位移將位元組資料流讀取到緩衝區中,作為以指定的緩衝區位移開頭的陣列。Reads a stream of bytes from the specified column offset into the buffer an array starting at the given buffer offset.

GetChar(Int32)

從指定的資料行取得單一字元形式的值。Gets the value of the specified column as a single character.

GetChars(Int32, Int64, Char[], Int32, Int32)

從指定的資料行位移將字元資料流讀取到緩衝區中,作為以指定緩衝區位移開頭的陣列。Reads a stream of characters from the specified column offset into the buffer as an array starting at the given buffer offset.

GetColumnSchema()

取得唯讀資料行結構描述集合。Gets the read-only column schema collection.

GetColumnSchemaAsync(CancellationToken)

這是 GetColumnSchema(DbDataReader) 的非同步版本。This is the asynchronous version of GetColumnSchema(DbDataReader). 提供者應該覆寫為適當的實作。Providers should override with an appropriate implementation. 您可以選擇性地接受 cancellationTokenThe cancellationToken can optionally be honored. 預設實作會叫用同步GetColumnSchema(DbDataReader)呼叫並傳回完成的工作。The default implementation invokes the synchronous GetColumnSchema(DbDataReader) call and returns a completed task. 如果傳遞一個已經被取消的 cancellationToken,預設實作會傳回已取消的工作。The default implementation will return a cancelled task if passed an already cancelled cancellationToken. GetColumnSchema(DbDataReader) 擲回的例外狀況會透過傳回的工作例外狀況屬性來傳送。Exceptions thrown by GetColumnSchema(DbDataReader) will be communicated via the returned Task Exception property.

(繼承來源 DbDataReader)
GetData(Int32)

傳回指定之資料行序數的 IDataReaderReturns an IDataReader for the specified column ordinal.

GetData(Int32)

傳回所要求資料行的巢狀資料讀取器。Returns a nested data reader for the requested column.

(繼承來源 DbDataReader)
GetDataTypeName(Int32)

取得字串,表示指定之資料行的資料型別。Gets a string representing the data type of the specified column.

GetDateTime(Int32)

取得指定之資料行的值做為 DateTime 物件。Gets the value of the specified column as a DateTime object.

GetDateTimeOffset(Int32)

擷取指定資料行的值做為 DateTimeOffset 物件。Retrieves the value of the specified column as a DateTimeOffset object.

GetDbDataReader(Int32)

傳回所要求資料行序數的 DbDataReader 物件,可使用提供者特定的實作 (Implementation) 覆寫。Returns a DbDataReader object for the requested column ordinal that can be overridden with a provider-specific implementation.

(繼承來源 DbDataReader)
GetDecimal(Int32)

取得指定之資料行的值做為 Decimal 物件。Gets the value of the specified column as a Decimal object.

GetDouble(Int32)

從指定的資料行取得雙精確度浮點數形式的值。Gets the value of the specified column as a double-precision floating point number.

GetEnumerator()

傳回透過 IEnumerator 重複的 SqlDataReaderReturns an IEnumerator that iterates through the SqlDataReader.

GetFieldType(Int32)

取得 Type,即是物件的資料型別。Gets the Type that is the data type of the object.

GetFieldValue<T>(Int32)

同步取得指定之資料行的值做為型別。Synchronously gets the value of the specified column as a type. GetFieldValueAsync<T>(Int32, CancellationToken) 是這個方法的非同步版本。GetFieldValueAsync<T>(Int32, CancellationToken) is the asynchronous version of this method.

GetFieldValue<T>(Int32)

取得所指定資料行值作為要求類型。Gets the value of the specified column as the requested type.

(繼承來源 DbDataReader)
GetFieldValueAsync<T>(Int32)

以非同步方式取得所指定資料行的值作為要求類型。Asynchronously gets the value of the specified column as the requested type.

(繼承來源 DbDataReader)
GetFieldValueAsync<T>(Int32, CancellationToken)

非同步取得指定之資料行的值做為型別。Asynchronously gets the value of the specified column as a type. GetFieldValue<T>(Int32) 是這個方法的同步版本。GetFieldValue<T>(Int32) is the synchronous version of this method.

GetFieldValueAsync<T>(Int32, CancellationToken)

以非同步方式取得所指定資料行的值作為要求類型。Asynchronously gets the value of the specified column as the requested type.

(繼承來源 DbDataReader)
GetFloat(Int32)

取得指定資料行的值做為單精確度浮點數。Gets the value of the specified column as a single-precision floating point number.

GetGuid(Int32)

從指定的資料行取得通用唯一識別碼 (GUID) 形式的值。Gets the value of the specified column as a globally unique identifier (GUID).

GetHashCode()

做為預設雜湊函式。Serves as the default hash function.

(繼承來源 Object)
GetInt16(Int32)

取得指定資料行的值做為 16 位元帶正負號的整數。Gets the value of the specified column as a 16-bit signed integer.

GetInt32(Int32)

取得指定資料行的值作為 32 位元帶正負號的整數。Gets the value of the specified column as a 32-bit signed integer.

GetInt64(Int32)

取得指定資料行的值做為 64 位元帶正負號的整數 (Signed Integer)。Gets the value of the specified column as a 64-bit signed integer.

GetLifetimeService()
已過時。

擷取控制這個執行個體存留期 (Lifetime) 原則的目前存留期服務物件。Retrieves the current lifetime service object that controls the lifetime policy for this instance.

(繼承來源 MarshalByRefObject)
GetName(Int32)

取得指定資料行的名稱。Gets the name of the specified column.

GetOrdinal(String)

提供資料行的名稱,取得資料行序數。Gets the column ordinal, given the name of the column.

GetProviderSpecificFieldType(Int32)

取得 Object,其為基礎提供者特定欄位型別的表示。Gets an Object that is a representation of the underlying provider-specific field type.

GetProviderSpecificValue(Int32)

取得 Object,其為基礎提供者特定值的表示。Gets an Object that is a representation of the underlying provider specific value.

GetProviderSpecificValues(Object[])

取得物件的陣列,這些物件是基礎提供者特定值的表示。Gets an array of objects that are a representation of the underlying provider specific values.

GetSchemaTable()

傳回 DataTable,以描述 SqlDataReader 的資料行中繼資料。Returns a DataTable that describes the column metadata of the SqlDataReader.

GetSchemaTable()

傳回 DataTable,以描述 DbDataReader 的資料行中繼資料。Returns a DataTable that describes the column metadata of the DbDataReader.

(繼承來源 DbDataReader)
GetSchemaTableAsync(CancellationToken)

這是 GetSchemaTable() 的非同步版本。This is the asynchronous version of GetSchemaTable(). 提供者應該覆寫為適當的實作。Providers should override with an appropriate implementation. 您可以選擇性地接受 cancellationTokenThe cancellationToken can optionally be honored. 預設實作會叫用同步GetSchemaTable()呼叫並傳回完成的工作。The default implementation invokes the synchronous GetSchemaTable() call and returns a completed task. 如果傳遞一個已經被取消的 cancellationToken,預設實作會傳回已取消的工作。The default implementation will return a cancelled task if passed an already cancelled cancellationToken. GetSchemaTable() 擲回的例外狀況會透過傳回的工作例外狀況屬性來傳送。Exceptions thrown by GetSchemaTable() will be communicated via the returned Task Exception property.

(繼承來源 DbDataReader)
GetSqlBinary(Int32)

取得指定的資料行值做為 SqlBinaryGets the value of the specified column as a SqlBinary.

GetSqlBoolean(Int32)

取得指定的資料行值做為 SqlBooleanGets the value of the specified column as a SqlBoolean.

GetSqlByte(Int32)

取得指定的資料行值做為 SqlByteGets the value of the specified column as a SqlByte.

GetSqlBytes(Int32)

取得指定資料行的值做為 SqlBytesGets the value of the specified column as SqlBytes.

GetSqlChars(Int32)

取得指定資料行的值做為 SqlCharsGets the value of the specified column as SqlChars.

GetSqlDateTime(Int32)

取得指定的資料行值做為 SqlDateTimeGets the value of the specified column as a SqlDateTime.

GetSqlDecimal(Int32)

取得指定的資料行值做為 SqlDecimalGets the value of the specified column as a SqlDecimal.

GetSqlDouble(Int32)

取得指定的資料行值做為 SqlDoubleGets the value of the specified column as a SqlDouble.

GetSqlGuid(Int32)

取得指定的資料行值做為 SqlGuidGets the value of the specified column as a SqlGuid.

GetSqlInt16(Int32)

取得指定的資料行值做為 SqlInt16Gets the value of the specified column as a SqlInt16.

GetSqlInt32(Int32)

取得指定的資料行值做為 SqlInt32Gets the value of the specified column as a SqlInt32.

GetSqlInt64(Int32)

取得指定的資料行值做為 SqlInt64Gets the value of the specified column as a SqlInt64.

GetSqlMoney(Int32)

取得指定的資料行值做為 SqlMoneyGets the value of the specified column as a SqlMoney.

GetSqlSingle(Int32)

取得指定的資料行值做為 SqlSingleGets the value of the specified column as a SqlSingle.

GetSqlString(Int32)

取得指定的資料行值做為 SqlStringGets the value of the specified column as a SqlString.

GetSqlValue(Int32)

將指定之資料行內的資料值當做 SQL Server 型別傳回。Returns the data value in the specified column as a SQL Server type.

GetSqlValues(Object[])

填滿 Object 陣列,其中包含記錄內所有資料行 (表示為 SQL Server 型別) 的值。Fills an array of Object that contains the values for all the columns in the record, expressed as SQL Server types.

GetSqlXml(Int32)

取得指定資料行的值做為 XML 值。Gets the value of the specified column as an XML value.

GetStream(Int32)

擷取二進位、影像、varbinary、UDT 和 variant 資料型別做為StreamRetrieves binary, image, varbinary, UDT, and variant data types as a Stream.

GetStream(Int32)

取得資料流以從指定的資料行擷取資料。Gets a stream to retrieve data from the specified column.

(繼承來源 DbDataReader)
GetString(Int32)

取得指定的資料行值做為字串。Gets the value of the specified column as a string.

GetTextReader(Int32)

擷取 Char、NChar、 NText、 NVarChar、 文字、 varChar 及 Variant 資料型別做為TextReaderRetrieves Char, NChar, NText, NVarChar, text, varChar, and Variant data types as a TextReader.

GetTextReader(Int32)

取得文字讀取器以從資料行擷取資料。Gets a text reader to retrieve data from the column.

(繼承來源 DbDataReader)
GetTimeSpan(Int32)

擷取指定資料行的值做為 TimeSpan 物件。Retrieves the value of the specified column as a TimeSpan object.

GetType()

取得目前執行個體的 TypeGets the Type of the current instance.

(繼承來源 Object)
GetValue(Int32)

取得使用原生格式的指定資料行值。Gets the value of the specified column in its native format.

GetValues(Object[])

使用目前資料列的資料行值填入物件陣列。Populates an array of objects with the column values of the current row.

GetXmlReader(Int32)

擷取 XML 型別的資料做為XmlReaderRetrieves data of type XML as an XmlReader.

InitializeLifetimeService()
已過時。

取得存留期服務物件,以控制這個執行個體的存留期原則。Obtains a lifetime service object to control the lifetime policy for this instance.

(繼承來源 MarshalByRefObject)
IsCommandBehavior(CommandBehavior)

判斷指定的 CommandBehavior 是否與 SqlDataReader 的行為相符。Determines whether the specified CommandBehavior matches that of the SqlDataReader .

IsDBNull(Int32)

取得值,指出資料行是否含有不存在或遺漏的值。Gets a value that indicates whether the column contains non-existent or missing values.

IsDBNullAsync(Int32)

以非同步方式取得值,指出資料行是否包含不存在或遺漏的值。Asynchronously gets a value that indicates whether the column contains non-existent or missing values.

(繼承來源 DbDataReader)
IsDBNullAsync(Int32, CancellationToken)

IsDBNull(Int32) 的非同步版本,該版本會取得值,表示資料行是否包含不存在或遺漏的值。An asynchronous version of IsDBNull(Int32), which gets a value that indicates whether the column contains non-existent or missing values.

取消語彙基元可用於要求在命令逾時之前捨棄作業。The cancellation token can be used to request that the operation be abandoned before the command timeout elapses. 例外狀況將經由傳回的 Task 物件回報。Exceptions will be reported via the returned Task object.

IsDBNullAsync(Int32, CancellationToken)

以非同步方式取得值,指出資料行是否包含不存在或遺漏的值。Asynchronously gets a value that indicates whether the column contains non-existent or missing values.

(繼承來源 DbDataReader)
MemberwiseClone()

建立目前 Object 的淺層複製。Creates a shallow copy of the current Object.

(繼承來源 Object)
MemberwiseClone(Boolean)

建立目前 MarshalByRefObject 物件的淺層複本。Creates a shallow copy of the current MarshalByRefObject object.

(繼承來源 MarshalByRefObject)
NextResult()

當讀取批次 Transact-SQL 陳述式的結果時,將資料讀取器前移到下一個結果。Advances the data reader to the next result, when reading the results of batch Transact-SQL statements.

NextResultAsync()

在讀取陳述式批次的結果時,以非同步方式將讀取器向前移到下一個結果。Asynchronously advances the reader to the next result when reading the results of a batch of statements.

(繼承來源 DbDataReader)
NextResultAsync(CancellationToken)

NextResult() 的非同步版本,該版本會在讀取批次 Transact-SQLTransact-SQL 陳述式的結果時,將資料讀取器前移至下一個結果。An asynchronous version of NextResult(), which advances the data reader to the next result, when reading the results of batch Transact-SQLTransact-SQL statements.

取消語彙基元可用於要求在命令逾時之前捨棄作業。The cancellation token can be used to request that the operation be abandoned before the command timeout elapses. 例外狀況將經由傳回的 Task 物件回報。Exceptions will be reported via the returned Task object.

NextResultAsync(CancellationToken)

在讀取陳述式批次的結果時,以非同步方式將讀取器向前移到下一個結果。Asynchronously advances the reader to the next result when reading the results of a batch of statements.

(繼承來源 DbDataReader)
Read()

SqlDataReader 推進到下一筆記錄。Advances the SqlDataReader to the next record.

ReadAsync()

以非同步方式將讀取器向前移到結果集中的下一筆記錄。Asynchronously advances the reader to the next record in a result set.

(繼承來源 DbDataReader)
ReadAsync(CancellationToken)

非同步版本的 Read(),這個版本會將 SqlDataReader 前移至下一筆記錄。An asynchronous version of Read(), which advances the SqlDataReader to the next record.

取消語彙基元可用於要求在命令逾時之前捨棄作業。The cancellation token can be used to request that the operation be abandoned before the command timeout elapses. 例外狀況將經由傳回的 Task 物件回報。Exceptions will be reported via the returned Task object.

ReadAsync(CancellationToken)

以非同步方式將讀取器向前移到結果集中的下一筆記錄。Asynchronously advances the reader to the next record in a result set.

(繼承來源 DbDataReader)
ToString()

傳回代表目前物件的字串。Returns a string that represents the current object.

(繼承來源 Object)

明確介面實作

IDataReader.Close()

如需這個成員的說明,請參閱 Close()For a description of this member, see Close().

(繼承來源 DbDataReader)
IDataReader.GetSchemaTable()

如需這個成員的說明,請參閱 GetSchemaTable()For a description of this member, see GetSchemaTable().

(繼承來源 DbDataReader)
IDataRecord.GetData(Int32)

傳回指定之資料行序數的 IDataReaderReturns an IDataReader for the specified column ordinal.

IDataRecord.GetData(Int32)

如需這個成員的說明,請參閱 GetData(Int32)For a description of this member, see GetData(Int32).

(繼承來源 DbDataReader)
IDisposable.Dispose()

釋放資料讀取器使用的所有資源。Releases all resources that are used by the data reader.

IEnumerable.GetEnumerator()

傳回可用來逐一查看項目集合的列舉值。Returns an enumerator that can be used to iterate through the item collection.

擴充方法

CanGetColumnSchema(DbDataReader)

取得值,指出 DbDataReader 是否可取得資料行結構描述。Gets a value that indicates whether a DbDataReader can get a column schema.

GetColumnSchema(DbDataReader)

取得 DbDataReader 的資料行結構描述 (DbColumn 集合)。Gets the column schema (DbColumn collection) for a DbDataReader.

Cast<TResult>(IEnumerable)

IEnumerable 的項目轉換成指定的型別。Casts the elements of an IEnumerable to the specified type.

OfType<TResult>(IEnumerable)

根據指定的型別來篩選 IEnumerable 的項目。Filters the elements of an IEnumerable based on a specified type.

AsParallel(IEnumerable)

啟用查詢的平行化作業。Enables parallelization of a query.

AsQueryable(IEnumerable)

IEnumerable 轉換成 IQueryableConverts an IEnumerable to an IQueryable.

適用於

另請參閱