DataTable.Columns 属性

定义

命名空间:
System.Data
程序集:
System.Data.dll, netstandard.dll, System.Data.Common.dll

获取属于该表的列的集合。Gets the collection of columns that belong to this table.

public:
 property System::Data::DataColumnCollection ^ Columns { System::Data::DataColumnCollection ^ get(); };
[System.Data.DataSysDescription("DataTableColumnsDescr")]
public System.Data.DataColumnCollection Columns { get; }
member this.Columns : System.Data.DataColumnCollection
Public ReadOnly Property Columns As DataColumnCollection

属性值

DataColumnCollection

一个 DataColumnCollection，包含该表的 DataColumn 对象的集合。A DataColumnCollection that contains the collection of DataColumn objects for the table. 如果 DataColumn 对象不存在，将返回空集合。An empty collection is returned if no DataColumn objects exist.

属性
DataSysDescriptionAttribute

示例

下面的示例使用 Columns 属性输出表中每一行的每个值。The following example prints each value of each row in a table using the Columns property.

private void PrintValues(DataTable table)
{
    foreach(DataRow row in table.Rows)
    {
        foreach(DataColumn column in table.Columns)
        {
            Console.WriteLine(row[column]);
        }
    }
}

Private Sub PrintValues(ByVal table As DataTable)
    Dim row As DataRow
    Dim column As DataColumn
    For Each row in table.Rows
       For Each column In table.Columns
          Console.WriteLine(row(column))
       Next
    Next
End Sub

注解

DataColumnCollection 通过定义每个列的数据类型来确定表的架构。The DataColumnCollection determines the schema of a table by defining the data type of each column.

适用于

另请参阅