DataColumn.ColumnMapping 属性

定义

获取或设置列的 MappingTypeGets or sets the MappingType of the column.

public:
 virtual property System::Data::MappingType ColumnMapping { System::Data::MappingType get(); void set(System::Data::MappingType value); };
public virtual System.Data.MappingType ColumnMapping { get; set; }
[System.Data.DataSysDescription("DataColumnMappingDescr")]
public virtual System.Data.MappingType ColumnMapping { get; set; }
member this.ColumnMapping : System.Data.MappingType with get, set
[<System.Data.DataSysDescription("DataColumnMappingDescr")>]
member this.ColumnMapping : System.Data.MappingType with get, set
Public Overridable Property ColumnMapping As MappingType

属性值

MappingType

MappingType 值之一。One of the MappingType values.

属性

示例

下面的示例设置 ColumnMapping new 的 type 属性 DataColumnThe following example sets the ColumnMapping type property of new DataColumn.

private void AddColumn(DataTable table)
{
    // Create a new column and set its properties.
    DataColumn column = new DataColumn("column",
        typeof(int), "", MappingType.Attribute);
    column.DataType = Type.GetType("System.String");
    column.ColumnMapping = MappingType.Element;

    // Add the column the table's columns collection.
    table.Columns.Add(column);
}
Private Sub AddColumn(table As DataTable )
    ' Create a new column and set its properties.
    Dim column As New DataColumn("ID", _
        Type.GetType("System.Int32"), "", MappingType.Attribute)
    column.DataType = Type.GetType("System.String")
    column.ColumnMapping = MappingType.Element

    ' Add the column the table's columns collection.
    table.Columns.Add(column)
End Sub

注解

ColumnMapping DataColumnDataSet 使用方法将另存为 XML 文档时,属性将确定如何映射 WriteXmlThe ColumnMapping property determines how a DataColumn is mapped when a DataSet is saved as an XML document using the WriteXml method.

例如,如果名为 DataColumn "customerID",其 ColumnMapping 属性设置为 MappingType.Element ,则列值将生成以下 XML:For example, if a DataColumn is named "customerID," and its ColumnMapping property is set to MappingType.Element, the column value will produce the following XML:

<Customers>  
 <customerID>ALFKI</customerID>  
......  
 </Customers>  
 <Orders>  
 <OrderID>12345</OrderID>  
 <customerID>ALFKI</customerID>  
......  
 </Orders>  

但是,如果将相同的列映射到 MappingType.Attribute ,将生成以下 XML:However, if the same column is mapped to MappingType.Attribute, the following XML is produced:

<Customers customerID="ALFKI"........more attributes.....>  
 <Order orderID="1234"....more attributes..../>  
 <Order orderID="1234"....more attributes..../>  
...... More orders for this customer  
 </Customers>  

使用 DataColumn 包含自变量的构造函数指定在将 type DataColumnDataSet 转换为 XML 文档时如何映射。Use the DataColumn constructor that contains the type argument to specify how the DataColumn is mapped when its DataSet is transformed to an XML document.

ColumnMapping属性对应于构造函数参数 typeThe ColumnMapping property corresponds to the constructor argument type.

适用于