BindingSource.RemoveAt(Int32) 方法

定義

命名空間:
System.Windows.Forms
組件:
System.Windows.Forms.dll

移除清單中位於指定索引上的項目。Removes the item at the specified index in the list.

public:
 virtual void RemoveAt(int index);
public virtual void RemoveAt (int index);
abstract member RemoveAt : int -> unit
override this.RemoveAt : int -> unit
Public Overridable Sub RemoveAt (index As Integer)

參數

index
Int32

要移除之項目的以零為起始的索引。The zero-based index of the item to remove.

實作

RemoveAt(Int32)

例外狀況

ArgumentOutOfRangeException

index 小於零或大於 Count 屬性的值。index is less than zero or greater than the value of the Count property.

NotSupportedException

由 List 屬性所表示的基礎清單是唯讀的，或是具有固定大小。The underlying list represented by the List property is read-only or has a fixed size.

範例

下列程式碼範例示範 List 、 RemoveAt 和 Count 成員。The following code example demonstrates the List, RemoveAt, and Count members. 若要執行這個範例，請將程式碼貼到包含名 BindingSource 為 BindingSource1 和的兩個標籤的表單中， label1 以及名為的 label2 按鈕 button1 。To run this example, paste the code into a form that contains a BindingSource named BindingSource1, two labels named label1 and label2, and a button named button1. 將 button1_Click 方法與的 Click 事件產生關聯 button1 。Associate the button1_Click method with the Click event for button1. Visual Basic 使用者將需要新增 System.Data.dll 的參考。Visual Basic users will need to add a reference to System.Data.dll.

private void button1_Click(object sender, EventArgs e)
{
    // Create the connection string, data adapter and data table.
    SqlConnection connectionString =
         new SqlConnection("Initial Catalog=Northwind;" +
         "Data Source=localhost;Integrated Security=SSPI;");
    SqlDataAdapter customersTableAdapter =
        new SqlDataAdapter("Select * from Customers", connectionString);
    DataTable customerTable = new DataTable();

    // Fill the adapter with the contents of the customer table.
    customersTableAdapter.Fill(customerTable);

    // Set data source for BindingSource1.
    BindingSource1.DataSource = customerTable;

    // Set the label text to the number of items in the collection before
    // an item is removed.
    label1.Text = "Starting count: " + BindingSource1.Count.ToString();

    // Access the List property and remove an item.
    BindingSource1.List.RemoveAt(4);

    // Remove an item directly from the BindingSource. 
    // This is equivalent to the previous line of code.
    BindingSource1.RemoveAt(4);

    // Show the new count.
    label2.Text = "Count after removal: " + BindingSource1.Count.ToString();
}

    Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) _
        Handles button1.Click

        ' Create the connection string, data adapter and data table.
        Dim connectionString As New SqlConnection("Initial Catalog=Northwind;" & _
            "Data Source=localhost;Integrated Security=SSPI;")
        Dim customersTableAdapter As New SqlDataAdapter("Select * from Customers", _
            connectionString)
        Dim customerTable As New DataTable()

        ' Fill the adapter with the contents of the customer table.
        customersTableAdapter.Fill(customerTable)

        ' Set data source for BindingSource1.
        BindingSource1.DataSource = customerTable

        ' Set the label text to the number of items in the collection before
        ' an item is removed.
        label1.Text = "Starting count: " + BindingSource1.Count.ToString()

        ' Access the List property and remove an item.
        BindingSource1.List.RemoveAt(4)

        ' Remove an item directly from the BindingSource. 
        ' This is equivalent to the previous line of code.
        BindingSource1.RemoveAt(4)

        ' Show the new count.
        label2.Text = "Count after removal: " + BindingSource1.Count.ToString()

    End Sub
End Class

備註

這兩個條件可以 IsFixedSize 分別使用和屬性進行測試 IsReadOnly 。These two conditions can be tested with the IsFixedSize and IsReadOnly properties, respectively.

這個方法會引發 ListChanged 事件。This method raises the ListChanged event.

適用於

另請參閱