BindingSource.Find 方法

來源:

BindingSource.cs

來源:

BindingSource.cs

來源:

BindingSource.cs

public:
 virtual int Find(System::ComponentModel::PropertyDescriptor ^ prop, System::Object ^ key);

public virtual int Find (System.ComponentModel.PropertyDescriptor prop, object key);

abstract member Find : System.ComponentModel.PropertyDescriptor * obj -> int
override this.Find : System.ComponentModel.PropertyDescriptor * obj -> int

Public Overridable Function Find (prop As PropertyDescriptor, key As Object) As Integer

參數

傳回

具有 PropertyDescriptor 指定值的項目之以零起始的索引。

實作

例外狀況

範例

下列程式碼範例會示範如何使用 Find 方法。 如需完整的範例，請參閱類別概觀主題。

private void button1_Click(object sender, EventArgs e)
{
    if (!binding1.SupportsSearching)
    {
        MessageBox.Show("Cannot search the list.");
    }
    else
    {
        int foundIndex = binding1.Find("Name", textBox1.Text);
        if (foundIndex > -1)
            listBox1.SelectedIndex = foundIndex;
        else
            MessageBox.Show("Font was not found.");
    }
}

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

        If binding1.SupportsSearching <> True Then
            MessageBox.Show("Cannot search the list.")
        Else
            Dim foundIndex As Integer = binding1.Find("Name", textBox1.Text)
            If foundIndex > -1 Then
                listBox1.SelectedIndex = foundIndex
            Else
                MessageBox.Show("Font was not found.")
            End If
        End If

    End Sub
End Class

備註

這個方法通常用於複雜的資料系結案例，以找出參數所指定 prop 欄位的值等於參數值 key 的第一個資料列

這個方法只會將要求參考基礎清單 IBindingList.Find 的 方法。 例如，如果基礎資料來源是 DataSet 、 DataTable 或 DataView ，這個方法會呼叫 DataView.IBindingList.Find 方法。 IBindingList.Find的行為，例如找不到相符專案時所傳回的值，取決於基礎清單中的 方法實作。

另請參閱

• List
• IndexOf(Object)
• Contains(Object)
• Count
• Position
• Item[Int32]

來源:

BindingSource.cs

來源:

BindingSource.cs

來源:

BindingSource.cs

public:
 int Find(System::String ^ propertyName, System::Object ^ key);

public int Find (string propertyName, object key);

member this.Find : string * obj -> int

Public Function Find (propertyName As String, key As Object) As Integer

參數

傳回

具有指定屬性名稱和值的項目之以零為起始的索引。

例外狀況

範例

下列範例示範如何使用 Find 方法搭配 DataView 。 若要執行此範例，請將程式碼貼到 Windows Form 中，並從表單的建構函式或 Load 事件處理方法呼叫 PopulateDataViewAndFind 。 您的表單應該匯入 System.Xml 和 System.IO 命名空間。

private void PopulateDataViewAndFind()
{
    DataSet set1 = new DataSet();

    // Some xml data to populate the DataSet with.
    string musicXml =
        "<?xml version='1.0' encoding='UTF-8'?>" +
        "<music>" +
        "<recording><artist>Coldplay</artist><cd>X&Y</cd></recording>" +
        "<recording><artist>Dave Matthews</artist><cd>Under the Table and Dreaming</cd></recording>" +
        "<recording><artist>Natalie Merchant</artist><cd>Tigerlily</cd></recording>" +
        "<recording><artist>U2</artist><cd>How to Dismantle an Atomic Bomb</cd></recording>" +
        "</music>";

    // Read the xml.
    StringReader reader = new StringReader(musicXml);
    set1.ReadXml(reader);

    // Get a DataView of the table contained in the dataset.
    DataTableCollection tables = set1.Tables;
    DataView view1 = new DataView(tables[0]);

    // Create a DataGridView control and add it to the form.
    DataGridView datagridview1 = new DataGridView();
    datagridview1.AutoGenerateColumns = true;
    this.Controls.Add(datagridview1);

    // Create a BindingSource and set its DataSource property to
    // the DataView.
    BindingSource source1 = new BindingSource();
    source1.DataSource = view1;

    // Set the data source for the DataGridView.
    datagridview1.DataSource = source1;

    // Set the Position property to the results of the Find method.
    int itemFound = source1.Find("artist", "Natalie Merchant");
    source1.Position = itemFound;
}

Private Sub PopulateDataViewAndFind() 
    Dim set1 As New DataSet()
    
    ' Some xml data to populate the DataSet with.
    Dim musicXml As String = "<?xml version='1.0' encoding='UTF-8'?>" & _
        "<music>" & _
        "<recording><artist>Coldplay</artist><cd>X&Y</cd></recording>" & _
        "<recording><artist>Dave Matthews</artist><cd>Under the Table and Dreaming</cd></recording>" & _
        "<recording><artist>Natalie Merchant</artist><cd>Tigerlily</cd></recording>" & _
        "<recording><artist>U2</artist><cd>How to Dismantle an Atomic Bomb</cd></recording>" & _
        "</music>"
    
    ' Read the xml.
    Dim reader As New StringReader(musicXml)
    set1.ReadXml(reader)
    
    ' Get a DataView of the table contained in the dataset.
    Dim tables As DataTableCollection = set1.Tables
    Dim view1 As New DataView(tables(0))
    
    ' Create a DataGridView control and add it to the form.
    Dim datagridview1 As New DataGridView()
    datagridview1.AutoGenerateColumns = True
    Me.Controls.Add(datagridview1)
    
    ' Create a BindingSource and set its DataSource property to
    ' the DataView.
    Dim source1 As New BindingSource()
    source1.DataSource = view1
    
    ' Set the data source for the DataGridView.
    datagridview1.DataSource = source1
    
    ' Set the Position property to the results of the Find method.
    Dim itemFound As Integer = source1.Find("artist", "Natalie Merchant")
    source1.Position = itemFound

End Sub

備註

Find只有在基礎清單是 IBindingList 實作搜尋的 時，才能使用 方法。 這個方法只會將要求參考基礎清單 IBindingList.Find 的 方法。 例如，如果基礎資料來源是 、 或 ，這個方法會 PropertyDescriptorpropertyName 轉換成 ，並呼叫 IBindingList.Find 方法。 DataViewDataTableDataSet Find的行為，例如找不到相符專案時所傳回的值，取決於基礎清單中的 方法實作。

屬性名稱比較不區分大小寫。