DataTable 类 (System.Data) | Microsoft Learn

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public ref class DataTable : System::ComponentModel::MarshalByValueComponent, System::ComponentModel::IListSource, System::ComponentModel::ISupportInitialize, System::ComponentModel::ISupportInitializeNotification, System::Runtime::Serialization::ISerializable, System::Xml::Serialization::IXmlSerializable

public ref class DataTable

public ref class DataTable : System::ComponentModel::MarshalByValueComponent, System::ComponentModel::IListSource, System::ComponentModel::ISupportInitialize, System::Runtime::Serialization::ISerializable

public ref class DataTable : System::ComponentModel::MarshalByValueComponent, System::ComponentModel::IListSource, System::ComponentModel::ISupportInitializeNotification, System::Runtime::Serialization::ISerializable, System::Xml::Serialization::IXmlSerializable

public class DataTable : System.ComponentModel.MarshalByValueComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitialize, System.ComponentModel.ISupportInitializeNotification, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

public class DataTable

[System.Serializable]
public class DataTable : System.ComponentModel.MarshalByValueComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitialize, System.Runtime.Serialization.ISerializable

[System.Serializable]
public class DataTable : System.ComponentModel.MarshalByValueComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitializeNotification, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

public class DataTable : System.ComponentModel.MarshalByValueComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitializeNotification, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

type DataTable = class
    inherit MarshalByValueComponent
    interface IListSource
    interface ISupportInitialize
    interface ISupportInitializeNotification
    interface ISerializable
    interface IXmlSerializable

type DataTable = class

[<System.Serializable>]
type DataTable = class
    inherit MarshalByValueComponent
    interface IListSource
    interface ISupportInitialize
    interface ISerializable

[<System.Serializable>]
type DataTable = class
    inherit MarshalByValueComponent
    interface IListSource
    interface ISupportInitializeNotification
    interface ISupportInitialize
    interface ISerializable
    interface IXmlSerializable

[<System.Serializable>]
type DataTable = class
    inherit MarshalByValueComponent
    interface IListSource
    interface ISupportInitializeNotification
    interface ISerializable
    interface IXmlSerializable
    interface ISupportInitialize

Public Class DataTable
Inherits MarshalByValueComponent
Implements IListSource, ISerializable, ISupportInitialize, ISupportInitializeNotification, IXmlSerializable

Public Class DataTable

Public Class DataTable
Inherits MarshalByValueComponent
Implements IListSource, ISerializable, ISupportInitialize

Public Class DataTable
Inherits MarshalByValueComponent
Implements IListSource, ISerializable, ISupportInitializeNotification, IXmlSerializable

Object

MarshalByValueComponent

DataTable

以下示例创建两 DataTable 个对象和一个 DataRelation 对象，并将新对象添加到一个 DataSet 对象。然后，表会显示在控件中 DataGridView 。


   // Put the next line into the Declarations section.
private System.Data.DataSet dataSet;
private void MakeDataTables()
    // Run all of the functions.
    MakeParentTable();
    MakeChildTable();
    MakeDataRelation();
    BindToDataGrid();
private void MakeParentTable()
    // Create a new DataTable.
    System.Data.DataTable table = new DataTable("ParentTable");
    // Declare variables for DataColumn and DataRow objects.
    DataColumn column;
    DataRow row;
    // Create new DataColumn, set DataType,
    // ColumnName and add to DataTable.
    column = new DataColumn();
    column.DataType = System.Type.GetType("System.Int32");
    column.ColumnName = "id";
    column.ReadOnly = true;
    column.Unique = true;
    // Add the Column to the DataColumnCollection.
    table.Columns.Add(column);
    // Create second column.
    column = new DataColumn();
    column.DataType = System.Type.GetType("System.String");
    column.ColumnName = "ParentItem";
    column.AutoIncrement = false;
    column.Caption = "ParentItem";
    column.ReadOnly = false;
    column.Unique = false;
    // Add the column to the table.
    table.Columns.Add(column);
    // Make the ID column the primary key column.
    DataColumn[] PrimaryKeyColumns = new DataColumn[1];
    PrimaryKeyColumns[0] = table.Columns["id"];
    table.PrimaryKey = PrimaryKeyColumns;
    // Instantiate the DataSet variable.
    dataSet = new DataSet();
    // Add the new DataTable to the DataSet.
    dataSet.Tables.Add(table);
    // Create three new DataRow objects and add
    // them to the DataTable
    for (int i = 0; i <= 2; i++)
        row = table.NewRow();
        row["id"] = i;
        row["ParentItem"] = "ParentItem " + i;
        table.Rows.Add(row);
private void MakeChildTable()
    // Create a new DataTable.
    DataTable table = new DataTable("childTable");
    DataColumn column;
    DataRow row;
    // Create first column and add to the DataTable.
    column = new DataColumn();
    column.DataType = System.Type.GetType("System.Int32");
    column.ColumnName = "ChildID";
    column.AutoIncrement = true;
    column.Caption = "ID";
    column.ReadOnly = true;
    column.Unique = true;
    // Add the column to the DataColumnCollection.
    table.Columns.Add(column);
    // Create second column.
    column = new DataColumn();
    column.DataType = System.Type.GetType("System.String");
    column.ColumnName = "ChildItem";
    column.AutoIncrement = false;
    column.Caption = "ChildItem";
    column.ReadOnly = false;
    column.Unique = false;
    table.Columns.Add(column);
    // Create third column.
    column = new DataColumn();
    column.DataType = System.Type.GetType("System.Int32");
    column.ColumnName = "ParentID";
    column.AutoIncrement = false;
    column.Caption = "ParentID";
    column.ReadOnly = false;
    column.Unique = false;
    table.Columns.Add(column);
    dataSet.Tables.Add(table);
    // Create three sets of DataRow objects,
    // five rows each, and add to DataTable.
    for (int i = 0; i <= 4; i++)
        row = table.NewRow();
        row["childID"] = i;
        row["ChildItem"] = "Item " + i;
        row["ParentID"] = 0;
        table.Rows.Add(row);
    for (int i = 0; i <= 4; i++)
        row = table.NewRow();
        row["childID"] = i + 5;
        row["ChildItem"] = "Item " + i;
        row["ParentID"] = 1;
        table.Rows.Add(row);
    for (int i = 0; i <= 4; i++)
        row = table.NewRow();
        row["childID"] = i + 10;
        row["ChildItem"] = "Item " + i;
        row["ParentID"] = 2;
        table.Rows.Add(row);
private void MakeDataRelation()
    // DataRelation requires two DataColumn
    // (parent and child) and a name.
    DataColumn parentColumn =
        dataSet.Tables["ParentTable"].Columns["id"];
    DataColumn childColumn =
        dataSet.Tables["ChildTable"].Columns["ParentID"];
    DataRelation relation = new
        DataRelation("parent2Child", parentColumn, childColumn);
    dataSet.Tables["ChildTable"].ParentRelations.Add(relation);
private void BindToDataGrid()
    // Instruct the DataGrid to bind to the DataSet, with the
    // ParentTable as the topmost DataTable.
    DataGrid1.SetDataBinding(dataSet, "ParentTable");
   
    ' Put the next line into the Declarations section.
private dataSet As DataSet 
Private Sub MakeDataTables()
    ' Run all of the functions. 
    MakeParentTable()
    MakeChildTable()
    MakeDataRelation()
    BindToDataGrid()
End Sub
Private Sub MakeParentTable()
    ' Create a new DataTable.
    Dim table As New DataTable("ParentTable")
    ' Declare variables for DataColumn and DataRow objects.
    Dim column As DataColumn 
    Dim row As DataRow 
    ' Create new DataColumn, set DataType, ColumnName 
    ' and add to DataTable.    
    column = New DataColumn()
    column.DataType = System.Type.GetType("System.Int32")
    column.ColumnName = "id"
    column.ReadOnly = True
    column.Unique = True
    ' Add the Column to the DataColumnCollection.
    table.Columns.Add(column)
    ' Create second column.
    column = New DataColumn()
    column.DataType = System.Type.GetType("System.String")
    column.ColumnName = "ParentItem"
    column.AutoIncrement = False
    column.Caption = "ParentItem"
    column.ReadOnly = False
    column.Unique = False
    ' Add the column to the table.
    table.Columns.Add(column)
    ' Make the ID column the primary key column.
    Dim PrimaryKeyColumns(0) As DataColumn
    PrimaryKeyColumns(0)= table.Columns("id")
    table.PrimaryKey = PrimaryKeyColumns
    ' Instantiate the DataSet variable.
    dataSet = New DataSet()
    ' Add the new DataTable to the DataSet.
    dataSet.Tables.Add(table)
    ' Create three new DataRow objects and add 
    ' them to the DataTable
    Dim i As Integer
    For i = 0 to 2
       row = table.NewRow()
       row("id") = i
       row("ParentItem") = "ParentItem " + i.ToString()
       table.Rows.Add(row)
    Next i
End Sub
Private Sub MakeChildTable()
    ' Create a new DataTable.
    Dim table As New DataTable("childTable")
    Dim column As DataColumn 
    Dim row As DataRow 
    ' Create first column and add to the DataTable.
    column = New DataColumn()
    column.DataType= System.Type.GetType("System.Int32")
    column.ColumnName = "ChildID"
    column.AutoIncrement = True
    column.Caption = "ID"
    column.ReadOnly = True
    column.Unique = True
    ' Add the column to the DataColumnCollection.
    table.Columns.Add(column)
    ' Create second column.
    column = New DataColumn()
    column.DataType= System.Type.GetType("System.String")
    column.ColumnName = "ChildItem"
    column.AutoIncrement = False
    column.Caption = "ChildItem"
    column.ReadOnly = False
    column.Unique = False
    table.Columns.Add(column)
    ' Create third column.
    column = New DataColumn()
    column.DataType= System.Type.GetType("System.Int32")
    column.ColumnName = "ParentID"
    column.AutoIncrement = False
    column.Caption = "ParentID"
    column.ReadOnly = False
    column.Unique = False
    table.Columns.Add(column)
    dataSet.Tables.Add(table)
    ' Create three sets of DataRow objects, five rows each, 
    ' and add to DataTable.
    Dim i As Integer
    For i = 0 to 4
       row = table.NewRow()
       row("childID") = i
       row("ChildItem") = "Item " + i.ToString()
       row("ParentID") = 0 
       table.Rows.Add(row)
    Next i
    For i = 0 to 4
       row = table.NewRow()
       row("childID") = i + 5
       row("ChildItem") = "Item " + i.ToString()
       row("ParentID") = 1 
       table.Rows.Add(row)
    Next i
    For i = 0 to 4
       row = table.NewRow()
       row("childID") = i + 10
       row("ChildItem") = "Item " + i.ToString()
       row("ParentID") = 2 
       table.Rows.Add(row)
    Next i
End Sub
Private Sub MakeDataRelation()
    ' DataRelation requires two DataColumn 
    ' (parent and child) and a name.
    Dim parentColumn As DataColumn = _
        dataSet.Tables("ParentTable").Columns("id")
    Dim childColumn As DataColumn = _
        dataSet.Tables("ChildTable").Columns("ParentID")
    Dim relation As DataRelation = new _
        DataRelation("parent2Child", parentColumn, childColumn)
    dataSet.Tables("ChildTable").ParentRelations.Add(relation)
End Sub
Private Sub BindToDataGrid()
    ' Instruct the DataGrid to bind to the DataSet, with the 
    ' ParentTable as the topmost DataTable.
    DataGrid1.SetDataBinding(dataSet,"ParentTable")
End Sub
    
     此示例演示如何使用特定的架构定义手动创建 DataTable：
    
    
     
      创建多个 DataTable 并定义初始列。
     
    
    
     
      创建表约束。
     
    
    
     
      插入值并显示表。
     
    
    
     
      创建表达式列并显示表。
     
     
      using System;
using System.Data;
class Program
    static void Main(string[] args)
        // Create two tables and add them into the DataSet
        DataTable orderTable = CreateOrderTable();
        DataTable orderDetailTable = CreateOrderDetailTable();
        DataSet salesSet = new DataSet();
        salesSet.Tables.Add(orderTable);
        salesSet.Tables.Add(orderDetailTable);
        // Set the relations between the tables and create the related constraint.
        salesSet.Relations.Add("OrderOrderDetail", orderTable.Columns["OrderId"], orderDetailTable.Columns["OrderId"], true);
        Console.WriteLine("After creating the foreign key constriant, you will see the following error if inserting order detail with the wrong OrderId: ");
            DataRow errorRow = orderDetailTable.NewRow();
            errorRow[0] = 1;
            errorRow[1] = "O0007";
            orderDetailTable.Rows.Add(errorRow);
        catch (Exception e)
            Console.WriteLine(e.Message);
        Console.WriteLine();
        // Insert the rows into the table
        InsertOrders(orderTable);
        InsertOrderDetails(orderDetailTable);
        Console.WriteLine("The initial Order table.");
        ShowTable(orderTable);
        Console.WriteLine("The OrderDetail table.");
        ShowTable(orderDetailTable);
        // Use the Aggregate-Sum on the child table column to get the result.
        DataColumn colSub = new DataColumn("SubTotal", typeof(Decimal), "Sum(Child.LineTotal)");
        orderTable.Columns.Add(colSub);
        // Compute the tax by referencing the SubTotal expression column.
        DataColumn colTax = new DataColumn("Tax", typeof(Decimal), "SubTotal*0.1");
        orderTable.Columns.Add(colTax);
        // If the OrderId is 'Total', compute the due on all orders; or compute the due on this order.
        DataColumn colTotal = new DataColumn("TotalDue", typeof(Decimal), "IIF(OrderId='Total',Sum(SubTotal)+Sum(Tax),SubTotal+Tax)");
        orderTable.Columns.Add(colTotal);
        DataRow row = orderTable.NewRow();
        row["OrderId"] = "Total";
        orderTable.Rows.Add(row);
        Console.WriteLine("The Order table with the expression columns.");
        ShowTable(orderTable);
        Console.WriteLine("Press any key to exit.....");
        Console.ReadKey();
    private static DataTable CreateOrderTable()
        DataTable orderTable = new DataTable("Order");
        // Define one column.
        DataColumn colId = new DataColumn("OrderId", typeof(String));
        orderTable.Columns.Add(colId);
        DataColumn colDate = new DataColumn("OrderDate", typeof(DateTime));
        orderTable.Columns.Add(colDate);
        // Set the OrderId column as the primary key.
        orderTable.PrimaryKey = new DataColumn[] { colId };
        return orderTable;
    private static DataTable CreateOrderDetailTable()
        DataTable orderDetailTable = new DataTable("OrderDetail");
        // Define all the columns once.
        DataColumn[] cols =
            new DataColumn("OrderDetailId", typeof(Int32)),
            new DataColumn("OrderId", typeof(String)),
            new DataColumn("Product", typeof(String)),
            new DataColumn("UnitPrice", typeof(Decimal)),
            new DataColumn("OrderQty", typeof(Int32)),
            new DataColumn("LineTotal", typeof(Decimal), "UnitPrice*OrderQty")
        orderDetailTable.Columns.AddRange(cols);
        orderDetailTable.PrimaryKey = new DataColumn[] { orderDetailTable.Columns["OrderDetailId"] };
        return orderDetailTable;
    private static void InsertOrders(DataTable orderTable)
        // Add one row once.
        DataRow row1 = orderTable.NewRow();
        row1["OrderId"] = "O0001";
        row1["OrderDate"] = new DateTime(2013, 3, 1);
        orderTable.Rows.Add(row1);
        DataRow row2 = orderTable.NewRow();
        row2["OrderId"] = "O0002";
        row2["OrderDate"] = new DateTime(2013, 3, 12);
        orderTable.Rows.Add(row2);
        DataRow row3 = orderTable.NewRow();
        row3["OrderId"] = "O0003";
        row3["OrderDate"] = new DateTime(2013, 3, 20);
        orderTable.Rows.Add(row3);
    private static void InsertOrderDetails(DataTable orderDetailTable)
        // Use an Object array to insert all the rows .
        // Values in the array are matched sequentially to the columns, based on the order in which they appear in the table.
        Object[] rows =
            new Object[] { 1, "O0001", "Mountain Bike", 1419.5, 36 },
            new Object[] { 2, "O0001", "Road Bike", 1233.6, 16 },
            new Object[] { 3, "O0001", "Touring Bike", 1653.3, 32 },
            new Object[] { 4, "O0002", "Mountain Bike", 1419.5, 24 },
            new Object[] { 5, "O0002", "Road Bike", 1233.6, 12 },
            new Object[] { 6, "O0003", "Mountain Bike", 1419.5, 48 },
            new Object[] { 7, "O0003", "Touring Bike", 1653.3, 8 },
        foreach (Object[] row in rows)
            orderDetailTable.Rows.Add(row);
    private static void ShowTable(DataTable table)
        foreach (DataColumn col in table.Columns)
            Console.Write("{0,-14}", col.ColumnName);
        Console.WriteLine();
        foreach (DataRow row in table.Rows)
            foreach (DataColumn col in table.Columns)
                if (col.DataType.Equals(typeof(DateTime)))
                    Console.Write("{0,-14:d}", row[col]);
                else if (col.DataType.Equals(typeof(Decimal)))
                    Console.Write("{0,-14:C}", row[col]);
                    Console.Write("{0,-14}", row[col]);
            Console.WriteLine();
        Console.WriteLine();
      
       Imports System.Data
Class Program
   Public Shared Sub Main(args As String())
      ' Create two tables and add them into the DataSet
      Dim orderTable As DataTable = CreateOrderTable()
      Dim orderDetailTable As DataTable = CreateOrderDetailTable()
      Dim salesSet As New DataSet()
      salesSet.Tables.Add(orderTable)
      salesSet.Tables.Add(orderDetailTable)
      ' Set the relations between the tables and create the related constraint.
      salesSet.Relations.Add("OrderOrderDetail", orderTable.Columns("OrderId"), orderDetailTable.Columns("OrderId"), True)
      Console.WriteLine("After creating the foreign key constriant, you will see the following error if inserting order detail with the wrong OrderId: ")
         Dim errorRow As DataRow = orderDetailTable.NewRow()
         errorRow(0) = 1
         errorRow(1) = "O0007"
         orderDetailTable.Rows.Add(errorRow)
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
      Console.WriteLine()
      ' Insert the rows into the table
      InsertOrders(orderTable)
      InsertOrderDetails(orderDetailTable)
      Console.WriteLine("The initial Order table.")
      ShowTable(orderTable)
      Console.WriteLine("The OrderDetail table.")
      ShowTable(orderDetailTable)
      ' Use the Aggregate-Sum on the child table column to get the result.
      Dim colSub As New DataColumn("SubTotal", GetType([Decimal]), "Sum(Child.LineTotal)")
      orderTable.Columns.Add(colSub)
      ' Compute the tax by referencing the SubTotal expression column.
      Dim colTax As New DataColumn("Tax", GetType([Decimal]), "SubTotal*0.1")
      orderTable.Columns.Add(colTax)
      ' If the OrderId is 'Total', compute the due on all orders; or compute the due on this order.
      Dim colTotal As New DataColumn("TotalDue", GetType([Decimal]), "IIF(OrderId='Total',Sum(SubTotal)+Sum(Tax),SubTotal+Tax)")
      orderTable.Columns.Add(colTotal)
      Dim row As DataRow = orderTable.NewRow()
      row("OrderId") = "Total"
      orderTable.Rows.Add(row)
      Console.WriteLine("The Order table with the expression columns.")
      ShowTable(orderTable)
      Console.WriteLine("Press any key to exit.....")
      Console.ReadKey()
   End Sub
   Private Shared Function CreateOrderTable() As DataTable
      Dim orderTable As New DataTable("Order")
      ' Define one column.
      Dim colId As New DataColumn("OrderId", GetType([String]))
      orderTable.Columns.Add(colId)
      Dim colDate As New DataColumn("OrderDate", GetType(DateTime))
      orderTable.Columns.Add(colDate)
      ' Set the OrderId column as the primary key.
      orderTable.PrimaryKey = New DataColumn() {colId}
      Return orderTable
   End Function
   Private Shared Function CreateOrderDetailTable() As DataTable
      Dim orderDetailTable As New DataTable("OrderDetail")
      ' Define all the columns once.
      Dim cols As DataColumn() = {New DataColumn("OrderDetailId", GetType(Int32)), New DataColumn("OrderId", GetType([String])), New DataColumn("Product", GetType([String])), New DataColumn("UnitPrice", GetType([Decimal])), New DataColumn("OrderQty", GetType(Int32)), New DataColumn("LineTotal", GetType([Decimal]), "UnitPrice*OrderQty")}
      orderDetailTable.Columns.AddRange(cols)
      orderDetailTable.PrimaryKey = New DataColumn() {orderDetailTable.Columns("OrderDetailId")}
      Return orderDetailTable
   End Function
   Private Shared Sub InsertOrders(orderTable As DataTable)
      ' Add one row once.
      Dim row1 As DataRow = orderTable.NewRow()
      row1("OrderId") = "O0001"
      row1("OrderDate") = New DateTime(2013, 3, 1)
      orderTable.Rows.Add(row1)
      Dim row2 As DataRow = orderTable.NewRow()
      row2("OrderId") = "O0002"
      row2("OrderDate") = New DateTime(2013, 3, 12)
      orderTable.Rows.Add(row2)
      Dim row3 As DataRow = orderTable.NewRow()
      row3("OrderId") = "O0003"
      row3("OrderDate") = New DateTime(2013, 3, 20)
      orderTable.Rows.Add(row3)
   End Sub
   Private Shared Sub InsertOrderDetails(orderDetailTable As DataTable)
      ' Use an Object array to insert all the rows .
      ' Values in the array are matched sequentially to the columns, based on the order in which they appear in the table.
      Dim rows As [Object]() = {New [Object]() {1, "O0001", "Mountain Bike", 1419.5, 36}, New [Object]() {2, "O0001", "Road Bike", 1233.6, 16}, New [Object]() {3, "O0001", "Touring Bike", 1653.3, 32}, New [Object]() {4, "O0002", "Mountain Bike", 1419.5, 24}, New [Object]() {5, "O0002", "Road Bike", 1233.6, 12}, New [Object]() {6, "O0003", "Mountain Bike", 1419.5, 48}, _
         New [Object]() {7, "O0003", "Touring Bike", 1653.3, 8}}
      For Each row As [Object]() In rows
         orderDetailTable.Rows.Add(row)
   End Sub
   Private Shared Sub ShowTable(table As DataTable)
      For Each col As DataColumn In table.Columns
         Console.Write("{0,-14}", col.ColumnName)
      Console.WriteLine()
      For Each row As DataRow In table.Rows
         For Each col As DataColumn In table.Columns
            If col.DataType.Equals(GetType(DateTime)) Then
               Console.Write("{0,-14:d}", row(col))
            ElseIf col.DataType.Equals(GetType([Decimal])) Then
               Console.Write("{0,-14:C}", row(col))
               Console.Write("{0,-14}", row(col))
            End If
         Console.WriteLine()
      Console.WriteLine()
   End Sub
End Class
       
        
         DataTable
        
        这是 ADO.NET 库中的中心对象。 使用
        
         DataTable
        
        include
        
         DataSet
        
        和 the
        
         DataView
        
        .
       
       
        访问
        
         DataTable
        
        对象时，请注意它们有条件区分大小写。 例如，如果一个
        
         DataTable
        
        名为“mydatatable”，另一个名为“Mydatatable”，则用于搜索其中一个表的字符串被视为区分大小写。 但是，如果“mydatatable”存在且“Mydatatable”不存在，则搜索字符串被视为不区分大小写。 A
        
         DataSet
        
        可以包含两
        
         DataTable
        
        
         TableName
        
        个具有相同属性值但不同
        
         Namespace
        
        属性值的对象。 有关使用
        
         DataTable
        
        对象的详细信息，请参阅
        
         创建 DataTable
        
        。
       
       
        如果要以编程方式创建
        
         DataTable
        
        架构，必须先通过将对象添加到
        
         DataColumn
        
        
         DataColumnCollection
        
        通过
        
         Columns
        
        属性) 访问的 (来定义其架构。 有关添加
        
         DataColumn
        
        对象的详细信息，请参阅
        
         向 DataTable 添加列
        
        。
       
       
        若要向 a
        
         DataTable
        
        添加行，必须先使用
        
         NewRow
        
        该方法返回新
        
         DataRow
        
        对象。 该方法
        
         NewRow
        
        返回具有架构的
        
         DataTable
        
        行，因为它由表的定义
        
         DataColumnCollection
        
        。 可存储的最大行
        
         DataTable
        
        数为 16，777，216。 有关详细信息，请参阅
        
         将数据添加到 DataTable
        
        。
       
       
        它还
        
         DataTable
        
        包含可用于确保数据完整性的对象集合
        
         Constraint
        
        。 有关详细信息，请参阅
        
         DataTable 约束
        
        。
       
       
        有许多
        
         DataTable
        
        事件可用于确定何时对表进行更改。 其中包括
        
         RowChanged
        
        、
        
         RowChanging
        
        、
        
         RowDeleting
        
        和
        
         RowDeleted
        
        。 有关可用于 a
        
         DataTable
        
        的事件的详细信息，请参阅
        
         处理 DataTable 事件
        
        。
       
       
        创建实例
        
         DataTable
        
        时，某些读/写属性设置为初始值。 有关这些值的列表，请参阅
        
         DataTable.DataTable
        
        构造函数主题。
       
       
        这些
        
         DataSet
        
        对象
        
         DataTable
        
        继承
        
         MarshalByValueComponent
        
        自并支持
        
         ISerializable
        
        .NET Framework远程处理接口。 以下是可用于.NET Framework远程处理的唯一 ADO.NET 对象。
       
       
        安全注意事项
       
       
        有关 DataSet 和 DataTable 安全性的信息，请参阅
        
         安全指南
        
        。