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DataColumn Constructor (String, Type, String, MappingType)

Initializes a new instance of the DataColumn class using the specified name, data type, expression, and value that determines whether the column is an attribute.

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

public:
DataColumn(
	String^ columnName, 
	Type^ dataType, 
	String^ expr, 
	MappingType type
)

Parameters

columnName
Type: System::String

A string that represents the name of the column to be created. If set to nullptr or an empty string (""), a default name will be specified when added to the columns collection.

dataType
Type: System::Type

A supported DataType.

expr
Type: System::String

The expression used to create this column. For more information, see the Expression property.

type
Type: System.Data::MappingType

One of the MappingType values.

ExceptionCondition
ArgumentNullException

No dataType was specified.

The type argument sets the ColumnMapping property. The property specifies how a DataColumn is mapped when a DataSet is transformed into an XML document. For example, if the column is named "fName," and the value it contains is "Bob," and type is set to MappingType.Attribute, the XML element would be as follows:

<Name fName = 'Bob'/>

For more information about how columns are mapped to elements or attributes, see the ColumnMapping property.

The following example constructs a computed column.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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