BindingSource.Find 方法

Source:

BindingSource.cs

Source:

BindingSource.cs

Source:

BindingSource.cs

Source:

BindingSource.cs

Source:

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

参数

返回

具有给定值的 PropertyDescriptor项的从零开始的索引。

实现

例外

示例

下面的代码示例演示如何使用 Find 该方法。 有关完整示例，请参阅类概述主题。

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

注解

此方法通常用于复杂的数据绑定事例，以查找参数指定的 prop 字段值等于参数值 key 的第一行

此方法只是将请求引用基础列表 IBindingList.Find 的方法。 例如，如果基础数据源是一个 DataSet， DataTable或者 DataView此方法调用该方法 DataView.IBindingList.Find 。 IBindingList.Find如果未找到匹配项，则返回的值的行为取决于基础列表中的方法的实现。

另请参阅

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

Source:

BindingSource.cs

Source:

BindingSource.cs

Source:

BindingSource.cs

Source:

BindingSource.cs

Source:

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

参数

返回

具有指定属性名称和值的项的从零开始的索引。

例外

示例

以下示例演示如何将 Find 该方法与 a DataView. 若要运行此示例，请将代码粘贴到 Windows 窗体中，并从窗体的构造函数或PopulateDataViewAndFind事件处理方法调用Load。 窗体应导入 System.Xml 和 System.IO 命名空间。

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

注解

Find仅当基础列表是IBindingList实现搜索时，才能使用该方法。 此方法只是将请求引用基础列表 IBindingList.Find 的方法。 例如，如果基础数据源是一个，或者，此方法将转换为DataSetDataTable并调用该方法DataView。propertyNamePropertyDescriptorIBindingList.Find Find如果未找到匹配项，则返回的值的行为取决于基础列表中的方法的实现。

属性名称比较不区分大小写。