.NET Framework 类库 

DataTable 构造函数 ()

不带参数初始化 DataTable 类的新实例。

[Visual Basic]Public Sub New()[C#]public DataTable();[C++]public: DataTable();[JScript]public function DataTable();

备注

构造函数为 DataTable 对象的所有属性设置初始值。下表显示这些属性及其默认值。当创建 DataTable 的实例时，以下读/写属性将被设置为初始值。

属性默认值区分大小写如果它属于一个，则与父级 DataSet 相同。否则为 false。显示表达式空字符串 ("")区域设置与父级 DataSet 对象的 CultureInfo（由 Locale 属性返回）相同；如果不存在任何父对象，则默认为当前系统的 CultureInfo。最小容量25 行。

通过单独调用属性，可以更改这些属性值中的任何一个。

示例

[Visual Basic, C#, C++] 以下示例创建具有 DataColumn 和 DataRow 的新 DataTable，并在 DataGrid 控件中显示它。

[Visual Basic] Private Sub MakeDataTableAndDisplay()   ' Create new DataTable.   Dim myDataTable As New DataTable   ' Declare DataColumn and DataRow variables.   Dim myDataColumn As DataColumn   Dim myDataRow As DataRow   ' Create new DataColumn, set DataType, ColumnName and add to DataTable.       myDataColumn = New DataColumn   myDataColumn.DataType = System.Type.GetType("System.Int32")   myDataColumn.ColumnName = "id"   myDataTable.Columns.Add(myDataColumn)   ' Create second column.   myDataColumn = New DataColumn   myDataColumn.DataType = Type.GetType("System.String")   myDataColumn.ColumnName = "item"   myDataTable.Columns.Add(myDataColumn)   ' Create new DataRow objects and add to DataTable.       Dim i As Integer   For i = 0 To 10      myDataRow = myDataTable.NewRow      myDataRow("id") = i      myDataRow("item") = "item " & i      myDataTable.Rows.Add(myDataRow)   Next i   ' Set to DataGrid.DataSource property to the table.   DataGrid1.DataSource = myDataTableEnd Sub[C#] private void MakeDataTableAndDisplay(){   // Create new DataTable.   DataTable myDataTable = new DataTable();      // Declare DataColumn and DataRow variables.   DataColumn myDataColumn;   DataRow myDataRow;   // Create new DataColumn, set DataType, ColumnName and add to DataTable.       myDataColumn = new DataColumn();   myDataColumn.DataType = System.Type.GetType("System.Int32");   myDataColumn.ColumnName = "id";   myDataTable.Columns.Add(myDataColumn);   // Create second column.   myDataColumn = new DataColumn();   myDataColumn.DataType = Type.GetType("System.String");   myDataColumn.ColumnName = "item";   myDataTable.Columns.Add(myDataColumn);   // Create new DataRow objects and add to DataTable.       for(int i = 0; i < 10; i++){      myDataRow = myDataTable.NewRow();      myDataRow["id"] = i;      myDataRow["item"] = "item " + i;      myDataTable.Rows.Add(myDataRow);   }   // Set to DataGrid.DataSource property to the table.   dataGrid1.DataSource = myDataTable;}[C++] private: void MakeDataTableAndDisplay(){    // Create new DataTable.    DataTable* myDataTable = new DataTable();        // Declare DataColumn and DataRow variables.    DataColumn* myDataColumn;    DataRow* myDataRow;     // Create new DataColumn, set DataType, ColumnName and add to DataTable.        myDataColumn = new DataColumn();    myDataColumn->DataType = System::Type::GetType(S"System.Int32");    myDataColumn->ColumnName = S"id";    myDataTable->Columns->Add(myDataColumn);     // Create second column.    myDataColumn = new DataColumn();    myDataColumn->DataType = Type::GetType(S"System.String");    myDataColumn->ColumnName = S"item";    myDataTable->Columns->Add(myDataColumn);     // Create new DataRow objects and add to DataTable.        for(int i = 0; i < 10; i++){       myDataRow = myDataTable->NewRow();       myDataRow->Item[S"id"] = __box(i);       myDataRow->Item[S"item"] = String::Format( S"item {0}", __box(i));       myDataTable->Rows->Add(myDataRow);    }    // Set to DataGrid.DataSource property to the table.    dataGrid1->DataSource = myDataTable; }

[JScript] 没有可用于 JScript 的示例。若要查看 Visual Basic、C# 或 C++ 示例，请单击页左上角的“语言筛选器”按钮 。

要求

平台: Windows 98, Windows NT 4.0, Windows ME, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 系列, .NET Framework 精简版

请参见

DataTable 类 | DataTable 成员 | System.Data 命名空间 | DataTable 构造函数重载列表 | DataColumn | DataRow | DataView