ObjectDataSourceFilteringEventHandler ObjectDataSourceFilteringEventHandler ObjectDataSourceFilteringEventHandler ObjectDataSourceFilteringEventHandler Delegate

定義

public delegate void ObjectDataSourceFilteringEventHandler(System::Object ^ sender, ObjectDataSourceFilteringEventArgs ^ e);

public delegate void ObjectDataSourceFilteringEventHandler(object sender, ObjectDataSourceFilteringEventArgs e);

type ObjectDataSourceFilteringEventHandler = delegate of obj * ObjectDataSourceFilteringEventArgs -> unit

Public Delegate Sub ObjectDataSourceFilteringEventHandler(sender As Object, e As ObjectDataSourceFilteringEventArgs)

パラメーター

継承

ObjectObjectObjectObject

DelegateDelegateDelegateDelegate

ObjectDataSourceFilteringEventHandlerObjectDataSourceFilteringEventHandlerObjectDataSourceFilteringEventHandlerObjectDataSourceFilteringEventHandler

例

このセクションには、2 つのコード例が含まれています。This section contains two code examples. 最初のコード例を使用してフィルター選択されたデータを表示する方法を示します、ObjectDataSource制御、中間層ビジネス オブジェクトからデータを取得し、使用する、GridView結果を表示するコントロール。The first code example demonstrates how to display filtered data by using an ObjectDataSource control to retrieve data from a middle-tier business object, and then using a GridView control to display the results. 2 番目のコード例では、最初のコード例で使用される中間層ビジネス オブジェクトの例を示します。The second code example provides an example of a middle-tier business object that is used by the first code example.

次のコード例に示しますを使用してフィルター選択されたデータを表示する方法、ObjectDataSource制御、中間層ビジネス オブジェクトからデータを取得し、使用する、GridView結果を表示するコントロール。The following code example demonstrates how to display filtered data by using an ObjectDataSource control to retrieve data from a middle-tier business object, and then using a GridView control to display the results. ObjectDataSourceとしてこのデータを取得するメソッドを取得する場合にのみ、コントロールがデータをフィルター処理できる、DataSetまたはDataTableオブジェクト。The ObjectDataSource control can filter data only when the method that retrieves the data retrieves it as a DataSet or DataTable object. このため、SelectMethodプロパティとしてデータを取得するビジネス オブジェクト メソッドを識別する、DataSetまたはDataTableオブジェクト。For this reason, the SelectMethod property identifies a business object method that retrieves data as a DataSet or DataTable object.

コード例は、TextBoxコントロール、GridViewコントロール、ObjectDataSourceコントロールと送信ボタン。The code example consists of a TextBox control, a GridView control, the ObjectDataSource control, and a Submit button. 既定で、TextBoxコントロールには、Northwind traders 社の従業員のいずれかの名前が設定されます。By default, the TextBox control is populated with the name of one of the employees at Northwind Traders. GridViewコントロール内の名前で識別される従業員に関する情報を表示する、TextBoxします。The GridView control displays information about the employee who is identified by the name in the TextBox. 他の従業員のデータを取得する、TextBox制御に、従業員の完全な名前を入力してクリックして、送信ボタンをクリックします。To retrieve data for another employee, in the TextBox control, type the full name of the employee, and then click the Submit button.

FilterExpressionプロパティで指定されているメソッドによって取得されるデータをフィルター処理するために使用される式を指定します、SelectMethodプロパティ。The FilterExpression property specifies an expression that is used to filter the data that is retrieved by the method that is specified by the SelectMethod property. 含まれているパラメーターに評価されるパラメーターのプレース ホルダーを使用して、FilterParametersコレクション。It uses parameter placeholders that are evaluated to the parameters that are contained in the FilterParameters collection. この例ではパラメーターの型が文字列型のスペースを含む可能性があるため、パラメーターのプレース ホルダーは単一引用符 (') で囲みます。In this example, the parameter placeholder is enclosed by single quotation marks (') because the type of the parameter is a string type that might contain spaces. パラメーターの型が数値または日付の場合は、引用符は必要ありません。If the type of the parameter is numeric or date, quotation marks are not required. FilterParametersコレクションには、1 つのパラメーターが含まれています、FormParameterオブジェクトにバインドされている、TextBoxコントロール。The FilterParameters collection contains one parameter, a FormParameter object that is bound to the TextBox control.

名前が指定されていない場合、TextBoxコントロール、新しいパラメーター、ParameterValuesコレクション、検索が成功したようにします。If no name is specified in the TextBox control, a new parameter is added to the ParameterValues collection so that the search is successful.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS" Assembly="Samples.AspNet.CS" %>
<%@ Page language="c#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    protected void ObjectDataSource1_Filtering(object sender, ObjectDataSourceFilteringEventArgs e)
    {
        if (Textbox1.Text == "")
        {
            e.ParameterValues.Clear();
            e.ParameterValues.Add("FullName", "Nancy Davolio");
        }
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ObjectDataSource - C# Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">

        <p>Show all users with the following name.</p>

        <asp:textbox id="Textbox1" runat="server" text="Nancy Davolio" />

        <asp:gridview
          id="GridView1"
          runat="server"
          datasourceid="ObjectDataSource1"
          autogeneratecolumns="False">
          <columns>
            <asp:boundfield headertext="ID" datafield="EmpID" />
            <asp:boundfield headertext="Name" datafield="FullName" />
            <asp:boundfield headertext="Street Address" datafield="Address" />
          </columns>
        </asp:gridview>

        <!-- Security Note: The ObjectDataSource uses a FormParameter,
             Security Note: which does not perform validation of input from the client. -->

        <asp:objectdatasource
          id="ObjectDataSource1"
          runat="server"
          selectmethod="GetAllEmployeesAsDataSet"
          typename="Samples.AspNet.CS.EmployeeLogic"
          filterexpression="FullName='{0}'" OnFiltering="ObjectDataSource1_Filtering">
            <filterparameters>
              <asp:formparameter name="FullName" formfield="Textbox1" defaultvalue="Nancy Davolio" />
            </filterparameters>
        </asp:objectdatasource>

        <p><asp:button id="Button1" runat="server" text="Search" /></p>

    </form>
  </body>
</html>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB" Assembly="Samples.AspNet.VB" %>
<%@ Page language="vb" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    Protected Sub ObjectDataSource1_Filtering(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ObjectDataSourceFilteringEventArgs)
        If Textbox1.Text = "" Then
            e.ParameterValues.Clear()
            e.ParameterValues.Add("FullName", "Nancy Davolio")
        End If
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ObjectDataSource - VB Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">

        <p>Show all users with the following name.</p>

        <asp:textbox id="Textbox1" runat="server" text="Nancy Davolio" />

        <asp:gridview
          id="GridView1"
          runat="server"
          datasourceid="ObjectDataSource1"
          autogeneratecolumns="False">
          <columns>
            <asp:boundfield headertext="ID" datafield="EmpID" />
            <asp:boundfield headertext="Name" datafield="FullName" />
            <asp:boundfield headertext="Street Address" datafield="Address" />
          </columns>
        </asp:gridview>

        <!-- Security Note: The ObjectDataSource uses a FormParameter,
             Security Note: which does not perform validation of input from the client. -->

        <asp:objectdatasource
          id="ObjectDataSource1"
          runat="server"
          selectmethod="GetAllEmployeesAsDataSet"
          typename="Samples.AspNet.VB.EmployeeLogic"
          filterexpression="FullName='{0}'" OnFiltering="ObjectDataSource1_Filtering">
            <filterparameters>
              <asp:formparameter name="FullName" formfield="Textbox1" defaultvalue="Nancy Davolio" />
            </filterparameters>
        </asp:objectdatasource>

        <p><asp:button id="Button1" runat="server" text="Search" /></p>

    </form>
  </body>
</html>

次のコード例では、上記のコード例を使用する中間層ビジネス オブジェクトの例を示します。The following code example provides an example of a middle-tier business object that the preceding code example uses. コード例は、2 つの基本クラスで構成されています:EmployeeLogicとNorthwindEmployeeします。The code example consists of two basic classes: EmployeeLogic and NorthwindEmployee. EmployeeLogicクラスは、ビジネス ロジックをカプセル化とNorthwindEmployeeクラスは、モデル クラスを読み込んで、データ層からデータを永続化に必要な基本的な機能のみが含まれています。The EmployeeLogic class encapsulates business logic and the NorthwindEmployee class is a model class that contains only the basic functionality that is required to load and persist data from the data tier. わかりやすくするため、EmployeeLogicクラスは、データ層からデータを取得するのではなく、データの静的なセットを作成します。For simplicity, the EmployeeLogic class creates a static set of data, rather than retrieving the data from a data tier. 完全な作業例については、コンパイルし、Web フォームのコード例が提供すると、これらのクラスを使用する必要があります。For a complete working example, you must compile and use these classes with the Web Forms code examples that are provided.

namespace Samples.AspNet.CS {

using System;
using System.Collections;
using System.Data;
using System.Web.UI.WebControls;
  //
  // EmployeeLogic is a stateless business object that encapsulates 
  // the operations you can perform on a NorthwindEmployee object.
  //
  public class EmployeeLogic {
  
    
    // Returns a collection of NorthwindEmployee objects.
    public static ICollection GetAllEmployees () {
      ArrayList data = new ArrayList();
           
      data.Add(new NorthwindEmployee(1,"Nancy","Davolio","507 - 20th Ave. E. Apt. 2A"));
      data.Add(new NorthwindEmployee(2,"Andrew","Fuller","908 W. Capital Way"));
      data.Add(new NorthwindEmployee(3,"Janet","Leverling","722 Moss Bay Blvd."));
      data.Add(new NorthwindEmployee(4,"Margaret","Peacock","4110 Old Redmond Rd."));
      data.Add(new NorthwindEmployee(5,"Steven","Buchanan","14 Garrett Hill"));
      data.Add(new NorthwindEmployee(6,"Michael","Suyama","Coventry House Miner Rd."));
      data.Add(new NorthwindEmployee(7,"Robert","King","Edgeham Hollow Winchester Way"));
      
      return data;
    }
    
    public static NorthwindEmployee GetEmployee(object anID) {
      ArrayList data = GetAllEmployees() as ArrayList;     
      int empID = Int32.Parse(anID.ToString());      
      return data[empID] as NorthwindEmployee;
    }

    // 
    // To support basic filtering, the employees cannot
    // be returned as an array of objects, rather as a 
    // DataSet of the raw data values. 
    public static DataSet GetAllEmployeesAsDataSet () {
      ICollection employees = GetAllEmployees();
      
      DataSet ds = new DataSet("Table");
      
      // Create the schema of the DataTable.
      DataTable dt = new DataTable();
      DataColumn dc;
      dc = new DataColumn("EmpID",   typeof(int));    dt.Columns.Add(dc);
      dc = new DataColumn("FullName",typeof(string)); dt.Columns.Add(dc);
      dc = new DataColumn("Address", typeof(string)); dt.Columns.Add(dc);
      
      // Add rows to the DataTable.
      DataRow row;
            
      foreach (NorthwindEmployee ne in employees) {                
        row = dt.NewRow();
        row["EmpID"]    = ne.EmpID;
        row["FullName"] = ne.FullName;
        row["Address"]  = ne.Address;
        dt.Rows.Add(row);
      } 
      // Add the complete DataTable to the DataSet.
      ds.Tables.Add(dt);
      
      return ds;
    }    
  }

  public class NorthwindEmployee {

    public NorthwindEmployee (int anID, 
                              string aFirstName,
                              string aLastName,
                              string anAddress) {
      ID = anID;
      firstName = aFirstName;
      lastName = aLastName;   
      address = anAddress;
    }

    private object ID;
    public string EmpID {
      get { return ID.ToString();  }
    }

    private string lastName;
    public string LastName {
      get { return lastName; }
      set { lastName = value; }
    }

    private string firstName;
    public string FirstName {
      get { return firstName; }
      set { firstName = value;  }
    }
    
    public string FullName {
      get { return FirstName  + " " +  LastName; }
    }
    
    private string address;
    public string Address {
      get { return address; }
      set { address = value;  }
    }    
    
  }
}

Imports System
Imports System.Collections
Imports System.Data
Imports System.Web.UI.WebControls

Namespace Samples.AspNet.VB
'
' EmployeeLogic is a stateless business object that encapsulates 
' the operations you can perform on a NorthwindEmployee object.
'
Public Class EmployeeLogic
   
   ' Returns a collection of NorthwindEmployee objects.
   Public Shared Function GetAllEmployees() As ICollection
      Dim data As New ArrayList()
      
      data.Add(New NorthwindEmployee(1, "Nancy", "Davolio", "507 - 20th Ave. E. Apt. 2A"))
      data.Add(New NorthwindEmployee(2, "Andrew", "Fuller", "908 W. Capital Way"))
      data.Add(New NorthwindEmployee(3, "Janet", "Leverling", "722 Moss Bay Blvd."))
      data.Add(New NorthwindEmployee(4, "Margaret", "Peacock", "4110 Old Redmond Rd."))
      data.Add(New NorthwindEmployee(5, "Steven", "Buchanan", "14 Garrett Hill"))
      data.Add(New NorthwindEmployee(6, "Michael", "Suyama", "Coventry House Miner Rd."))
      data.Add(New NorthwindEmployee(7, "Robert", "King", "Edgeham Hollow Winchester Way"))
      
      Return data
   End Function 'GetAllEmployees
   
   
   Public Shared Function GetEmployee(anID As Object) As NorthwindEmployee
      Dim data As ArrayList = CType(GetAllEmployees(), ArrayList)
      Dim empID As Integer = Int32.Parse(anID.ToString())
      Return CType(data(empID),NorthwindEmployee)   
   End Function 'GetEmployee
   
   
   ' To support basic filtering, the employees cannot
   ' be returned as an array of objects, rather as a 
   ' DataSet of the raw data values. 
   Public Shared Function GetAllEmployeesAsDataSet() As DataSet
      Dim employees As ICollection = GetAllEmployees()
      
      Dim ds As New DataSet("Table")
      
      ' Create the schema of the DataTable.
      Dim dt As New DataTable()
      Dim dc As DataColumn
      dc = New DataColumn("EmpID", GetType(Integer))
      dt.Columns.Add(dc)
      dc = New DataColumn("FullName", GetType(String))
      dt.Columns.Add(dc)
      dc = New DataColumn("Address", GetType(String))
      dt.Columns.Add(dc)
      
      ' Add rows to the DataTable.
      Dim row As DataRow
      Dim ne As NorthwindEmployee
      For Each ne In employees         
         row = dt.NewRow()
         row("EmpID") = ne.EmpID
         row("FullName") = ne.FullName
         row("Address") = ne.Address
         dt.Rows.Add(row)
      Next
      ' Add the complete DataTable to the DataSet.
      ds.Tables.Add(dt)
      
      Return ds
   End Function 'GetAllEmployeesAsDataSet
      
End Class 'EmployeeLogic 


Public Class NorthwindEmployee
   
   Public Sub New(anID As Integer, aFirstName As String, aLastName As String, anAddress As String)
      ID = anID
      Me.aFirstName = aFirstName
      Me.aLastName = aLastName
      Me.aAddress = anAddress
   End Sub 'New
   
   Private ID As Object   
   Public ReadOnly Property EmpID() As String
      Get
         Return ID.ToString()
      End Get
   End Property 

   Private aLastName As String   
   Public Property LastName() As String
      Get
         Return aLastName
      End Get
      Set
         aLastName = value
      End Set
   End Property 

   Private aFirstName As String   
   Public Property FirstName() As String
      Get
         Return aFirstName
      End Get
      Set
         aFirstName = value
      End Set
   End Property 
   
   Public ReadOnly Property FullName() As String
      Get
         Return FirstName & " " & LastName
      End Get
   End Property 
  
   Private aAddress As String  
   Public Property Address() As String
      Get
         Return aAddress
      End Get
      Set
         aAddress = value
      End Set
   End Property 
   
End Class 'NorthwindEmployee
End Namespace

注釈

ObjectDataSourceFilteringEventHandler デリゲートを作成する場合は、イベントを処理するメソッドを指定します。When you create an ObjectDataSourceFilteringEventHandler delegate, you identify the method that will handle the event. イベントをイベント ハンドラーに関連付けるには、デリゲートのインスタンスをイベントに追加します。To associate the event with your event handler, add an instance of the delegate to the event. デリゲートを削除しない限り、そのイベントが発生すると常にイベント ハンドラーが呼び出されます。The event handler is called whenever the event occurs, unless you remove the delegate. イベントを処理する方法の詳細については、次を参照してください。処理とイベントの発生します。For more information about how to handle events, see Handling and Raising Events.

拡張メソッド

適用対象

こちらもご覧ください

• ObjectDataSourceFilteringEventArgs ObjectDataSourceFilteringEventArgs ObjectDataSourceFilteringEventArgs ObjectDataSourceFilteringEventArgs
• Filtering
• FilterParameters
• FilterExpression
• Cancel