BindingSource.RemoveAt(Int32) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
移除清單中位於指定索引上的項目。
public:
virtual void RemoveAt(int index);public virtual void RemoveAt (int index);abstract member RemoveAt : int -> unit
override this.RemoveAt : int -> unitPublic 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。
實作
例外狀況
index 小於零或大於 Count 屬性的值。
由 List 屬性所表示的基礎清單是唯讀的，或是具有固定大小。
範例
下列程式碼範例示範 List 、 RemoveAt 和 Count 成員。 若要執行此範例，請將程式碼貼入包含 BindingSource 名為 BindingSource1 的表單、名為 label1 和 label2 的兩個標籤，以及名為 的 button1 按鈕。 將 button1_Click 方法與 Click 的 事件產生 button1 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
這兩個條件可以分別使用 IsFixedSize 和 IsReadOnly 屬性進行測試。
這個方法會 ListChanged 引發 事件。
