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Item Property (String)
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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; }

Parameters

name
Type: System.String

The name of the column.

Property Value

Type: System.Object
The value of the specified column in its native format.

Implements

IDataRecord.Item

ExceptionCondition
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;
    }

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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