BindingSource.Count 屬性

定義

將目前的 Filter 值納入考慮,取得基本清單中的項目總數。Gets the total number of items in the underlying list, taking the current Filter value into consideration.

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。The total number of filtered items in the underlying list.

實作

屬性

範例

下列程式碼範例示範 ListRemoveAtCount 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 BindingSourceBindingSource1 和的兩個標籤的表單中, label1 以及名為的 label2 按鈕 button1To 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. button1_Click 方法與的 Click 事件產生關聯 button1Associate 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

屬性會取得屬性所 Count 表示之基礎清單中的專案數,由 List 屬性的值修改 FilterThe Count property gets the number of items in the underlying list represented by the List property as modified by the value of the Filter property.

適用於

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