BindingSource.Count 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

將目前的 Filter 值納入考慮，取得基本清單中的項目總數。

public:
 virtual property int Count { int get(); };

[System.ComponentModel.Browsable(false)]
public virtual int Count { get; }

[<System.ComponentModel.Browsable(false)>]
member this.Count : int

Public Overridable ReadOnly Property Count As Integer

屬性值

Int32

基礎清單中的篩選項目總數。

實作

Count

屬性

BrowsableAttribute

範例

下列程式碼範例示範 List 、 RemoveAt 和 Count 成員。 若要執行此範例，請將程式碼貼到表單中，其中包含名為 的 、名為 和 的兩個 BindingSource 標籤，以及名為 的 button1 按鈕。 label2label1BindingSource1 將 button1_Click 方法與 的 Clickbutton1 事件產生關聯。 Visual Basic 使用者必須新增System.Data.dll的參考。

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

屬性 Count 會取得屬性所修改之屬性所 List 代表之基礎清單中的專案數目，如 屬性的值 Filter 所修改。

另請參閱

• List
• Position
• Current