This documentation is archived and is not being maintained.

DataTableReader.Item Property (String)

Gets the value of the specified column in its native format given the column name.

Namespace: System.Data
Assembly: System.Data (in system.data.dll)

public override Object this [
	string name
] { get; }
/** @property */
public Object get_Item (String name)

Not applicable.

Parameters

name

The name of the column.

Property Value

The value of the specified column in its native format.

Exception typeCondition

ArgumentException

The name specified is not a valid column name.

DeletedRowInaccessibleException

An attempt was made to retrieve data from a deleted row.

InvalidOperationException

An attempt was made to read or access a column in a closed DataTableReader.

A case-sensitive lookup is performed first. If it fails, a second case-insensitive search is made.

This method is kana-width insensitive.

This overloaded version of Item corresponds to calling the GetOrdinal method, and then subsequently calling the GetValue method.

Given a DataTableReader and a column name, the GetValueByName procedure returns the value of the specified column. Before calling this procedure, you must create a new DataTableReader instance and call its Read method at least one time to position the row pointer on a row of data.

private static object GetValueByName(
    DataTableReader reader, string columnName)
{
    // Consider when to use a procedure like this one carefully:
    // if  you're going to retrieve information from a column
    // in a loop, it would be better to retrieve the column
    // ordinal once, store the value, and use the methods
    // of the DataTableReader class directly. 
    // Use this string-based indexer sparingly.
    object columnValue = null;

    try
    {
        columnValue = reader[columnName];
    }
    catch (ArgumentException ex)
    {
        // Throw all other errors back out to the caller.
        columnValue = null;
    }
    return columnValue;
}


Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

.NET Compact Framework

Supported in: 2.0

XNA Framework

Supported in: 1.0
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