BindingSource.Count プロパティ

定義

現在の Filter 値を考慮して、基になるリストの項目の合計数を取得します。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; }
member this.Count : int
Public Overridable ReadOnly Property Count As Integer

プロパティ値

基底のリストに含まれる、フィルター処理された項目の総数。The total number of filtered items in the underlying list.

実装

属性

次のコード例は、ListRemoveAt、および Count メンバーを示しています。The following code example demonstrates the List, RemoveAt, and Count members. この例を実行するには、BindingSource1という名前の BindingSourcelabel1label2という名前の2つのラベル、および button1という名前のボタンを含むフォームにコードを貼り付けます。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. button1_Click メソッドを button1Click イベントに関連付けます。Associate the button1_Click method with the Click event for button1. Visual Basic ユーザーは、System. .dll への参照を追加する必要があります。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

注釈

Count プロパティは、Filter プロパティの値によって変更された List プロパティによって表される、基になるリスト内の項目の数を取得します。The 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.

適用対象

こちらもご覧ください