IDataReader 接口

Provides a means of reading one or more forward-only streams of result sets obtained by executing a command at a data source, and is implemented by Reporting Services Data Processing Extensions that access relational databases.

命名空间：  Microsoft.ReportingServices.DataProcessing
程序集：   Microsoft.ReportingServices.SharePoint.UI.WebParts（在 Microsoft.ReportingServices.SharePoint.UI.WebParts.dll 中）
  Microsoft.ReportingServices.Interfaces（在 Microsoft.ReportingServices.Interfaces.dll 中）

语法

声明
Public Interface IDataReader _
    Inherits IDisposable
用法
Dim instance As IDataReader

public interface IDataReader : IDisposable

public interface class IDataReader : IDisposable

type IDataReader =  
    interface 
        interface IDisposable 
    end

public interface IDataReader extends IDisposable

IDataReader 类型公开以下成员。

属性

	名称	说明
	FieldCount	Gets the number of fields in the data reader.

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方法

	名称	说明
	Dispose	（从 IDisposable 继承。）
	GetFieldType	Gets the Type information corresponding to the type of object that is returned from GetValue.
	GetName	Gets the name of the field to find.
	GetOrdinal	Return the index of the named field.
	GetValue	Return the value of the specified field.
	Read	Advances the IDataReader to the next record.

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注释

The IDataReader interface enables you to implement a DataReader class, which provides a means of reading one or more forward-only streams of result sets. For more information about DataReader classes, see 为数据处理扩展插件实现 DataReader 类.

An application does not create an instance of the IDataReader interface directly, but creates an instance of a class that implements IDataReader.

Classes that implement IDataReader must also implement the required members, and typically define additional members to add provider-specific functionality.

Changes made to a result set by another process or thread while data is being read may be visible to the user of a class that implements an IDataReader. However, the precise behavior is both provider and timing dependent.

Users do not create an instance of a DataReader class directly. Instead, they obtain the DataReader through the ExecuteReader method of the Command object. Therefore, you should mark DataReader constructors as internal.

请参阅

参考

Microsoft.ReportingServices.DataProcessing 命名空间