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ListView.SelectedValue 속성

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정의

네임스페이스:
System.Web.UI.WebControls
어셈블리:
System.Web.Extensions.dll

ListView 컨트롤에서 선택한 항목의 데이터 키 값을 가져옵니다.

public:
 property System::Object ^ SelectedValue { System::Object ^ get(); };
[System.ComponentModel.Browsable(false)]
public object SelectedValue { get; }
[<System.ComponentModel.Browsable(false)>]
member this.SelectedValue : obj
Public ReadOnly Property SelectedValue As Object

속성 값

Object

ListView 컨트롤에서 선택한 항목의 데이터 키 값입니다.

특성
BrowsableAttribute

예제

다음 예제에서는 마스터/세부 정보 시나리오에서 첫 번째 키 필드를 매개 변수로 사용하는 방법을 보여줍니다. 컨트롤에서 ListViewSelectedValue 항목을 선택하면 속성이 개체의 ControlParameter 로 PropertyName 사용됩니다. 이 매개 변수 개체는 두 번째 ListView 컨트롤이 SqlDataSource 바인딩된 컨트롤에서 차례로 사용됩니다.

<%@ 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 CategoriesListView_OnItemDeleting(object sender, ListViewDeleteEventArgs e)
  {
    if (SubCategoriesGridView.Rows.Count > 0)
    {
      MessageLabel.Text = "You cannot delete a category that has sub-categories.";
      e.Cancel = true;
    }
  }

  protected void Page_Load()
  {
    MessageLabel.Text = String.Empty;
  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>Subcategories List</title>
  </head>
  <body>
    <form id="form1" runat="server">
      <b>Categories</b>
      <br />
      
      <asp:Label ForeColor="Red" runat="server" ID="MessageLabel" /><br />
      
      <asp:ListView runat="server" 
        ID="CategoriesListView"
        OnItemDeleting="CategoriesListView_OnItemDeleting"
        DataSourceID="CategoriesDataSource" 
        DataKeyNames="ProductCategoryID">
        <LayoutTemplate>
          <table runat="server" id="tblCategories" 
                 cellspacing="0" cellpadding="1" width="440px" border="1">
            <tr id="itemPlaceholder" runat="server"></tr>
          </table>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td>
              <asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
            </td>
            <td style="width:40px">
              <asp:LinkButton runat="server" ID="SelectCategoryButton" 
                Text="Select" CommandName="Select" />
            </td>
          </tr>
        </ItemTemplate>
        <SelectedItemTemplate>
          <tr runat="server" style="background-color:#90EE90">
            <td>
              <asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
            </td>
            <td style="width:40px">
              <asp:LinkButton runat="server" ID="SelectCategoryButton" 
                Text="Delete" CommandName="Delete" />
            </td>
          </tr>
        </SelectedItemTemplate>
      </asp:ListView>
      
      <br />
      
      <b>Subcategories</b>
      <asp:GridView runat="server" ID="SubCategoriesGridView" Width="300px"
           DataSourceID="SubCategoriesDataSource" DataKeyNames="ProductSubcategoryID" 
           AutoGenerateColumns="True" />
       
      <!-- This example uses Microsoft SQL Server and connects      -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
      <!-- expression to retrieve the connection string value       -->
      <!-- from the Web.config file.                                -->
      <asp:SqlDataSource ID="CategoriesDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ProductCategoryID], [Name]
                       FROM Production.ProductCategory">
      </asp:SqlDataSource>
      <asp:SqlDataSource ID="SubCategoriesDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ProductSubcategoryID], [Name]
                       FROM Production.ProductSubcategory
                       WHERE ProductCategoryID = @ProductCategoryID
                       ORDER BY [Name]">
          <SelectParameters>
            <asp:ControlParameter Name="ProductCategoryID" DefaultValue="0"
                 ControlID="CategoriesListView" PropertyName="SelectedValue"  />
          </SelectParameters>
      </asp:SqlDataSource>
    </form>
  </body>
</html>

<%@ 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 CategoriesListView_OnItemDeleting(sender As Object, e As ListViewDeleteEventArgs)
        If SubCategoriesGridView.Rows.Count > 0 Then
            MessageLabel.Text = "You cannot delete a category that has sub-categories."
            e.Cancel = True
        End If
    End Sub

    Protected Sub Page_Load()
        MessageLabel.Text = String.Empty
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>Subcategories List</title>
  </head>
  <body>
    <form id="form1" runat="server">
      <b>Categories</b>
      <br />
      
      <asp:Label ForeColor="Red" runat="server" ID="MessageLabel" /><br />
      
      <asp:ListView runat="server" 
        ID="CategoriesListView"
        OnItemDeleting="CategoriesListView_OnItemDeleting"
        DataSourceID="CategoriesDataSource" 
        DataKeyNames="ProductCategoryID">
        <LayoutTemplate>
          <table runat="server" id="tblCategories" 
                 cellspacing="0" cellpadding="1" width="440px" border="1">
            <tr id="itemPlaceholder" runat="server"></tr>
          </table>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td>
              <asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
            </td>
            <td style="width:40px">
              <asp:LinkButton runat="server" ID="SelectCategoryButton" 
                Text="Select" CommandName="Select" />
            </td>
          </tr>
        </ItemTemplate>
        <SelectedItemTemplate>
          <tr runat="server" style="background-color:#90EE90">
            <td>
              <asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
            </td>
            <td style="width:40px">
              <asp:LinkButton runat="server" ID="SelectCategoryButton" 
                Text="Delete" CommandName="Delete" />
            </td>
          </tr>
        </SelectedItemTemplate>
      </asp:ListView>
      
      <br />
      
      <b>Subcategories</b>
      <asp:GridView runat="server" ID="SubCategoriesGridView" Width="300px"
           DataSourceID="SubCategoriesDataSource" DataKeyNames="ProductSubcategoryID" 
           AutoGenerateColumns="True" />
       
      <!-- This example uses Microsoft SQL Server and connects      -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
      <!-- expression to retrieve the connection string value       -->
      <!-- from the Web.config file.                                -->
      <asp:SqlDataSource ID="CategoriesDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ProductCategoryID], [Name]
                       FROM Production.ProductCategory">
      </asp:SqlDataSource>
      <asp:SqlDataSource ID="SubCategoriesDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ProductSubcategoryID], [Name]
                       FROM Production.ProductSubcategory
                       WHERE ProductCategoryID = @ProductCategoryID
                       ORDER BY [Name]">
          <SelectParameters>
            <asp:ControlParameter Name="ProductCategoryID" DefaultValue="0"
                 ControlID="CategoriesListView" PropertyName="SelectedValue"  />
          </SelectParameters>
      </asp:SqlDataSource>
    </form>
  </body>
</html>

다음 예제에서는 사용 하는 방법에 설명 합니다 SelectedValue 키 필드의 값을 확인 하는 속성입니다.

<%@ 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 DepartmentsListView_SelectedIndexChanged(object sender, EventArgs e)
  {
    MessageLabel.Text = "The key value is " + 
      DepartmentsListView.SelectedValue.ToString() + ".";
  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView SelectedValue Example</title>
    <style type="text/css">
      .header
      {
        border: 1px solid #008080;
        background-color: #008080;
        color: White;
      }
      .item td { border: 1px solid #008080; }
      .selection td  
      {
        border: 1px solid #008080; 
        background-color: #7FFF00;
      }
    </style>
  </head>
  <body>
    <form id="form1" runat="server">
    
      <h3>ListView SelectedValue Example</h3>
            
      <asp:ListView runat="server" 
        ID="DepartmentsListView"
        DataSourceID="DepartmentDataSource" 
        DataKeyNames="DepartmentID" 
        OnSelectedIndexChanged="DepartmentsListView_SelectedIndexChanged">
        <LayoutTemplate>
          <b>Department List</b>
          <br />
          <table width="500px" runat="server" id="tblDepartments">
            <tr class="header" runat="server">
              <th runat="server">&nbsp;</th>
              <th runat="server">Department Name</th>
              <th runat="server">Group Name</th>
            </tr>
            <tr runat="server" id="itemPlaceholder" />
          </table>
        </LayoutTemplate>
        <ItemTemplate>
          <tr class="item" runat="server">
            <td>
              <asp:LinkButton runat="server" 
                ID="SelectButton" 
                Text="Select"
                CommandName="Select" />
            </td>
            <td>
              <asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
            </td>
            <td>
              <asp:Label runat="server" ID="GroupNameLabel" Text='<%#Eval("GroupName") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <SelectedItemTemplate>
          <tr class="selection" runat="server">
            <td>&nbsp;</td>
            <td>
              <asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
            </td>
            <td>
              <asp:Label runat="server" ID="GroupNameLabel" Text='<%#Eval("GroupName") %>' />
            </td>
          </tr>
        </SelectedItemTemplate>
      </asp:ListView>
      <br/>
      
      <asp:Label ID="MessageLabel"
        ForeColor="Red"
        runat="server"/>

      <!-- This example uses Microsoft SQL Server and connects      -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
      <!-- expression to retrieve the connection string value       -->
      <!-- from the Web.config file.                                -->
      <asp:SqlDataSource ID="DepartmentDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT DepartmentID, Name, GroupName 
          FROM HumanResources.Department">
      </asp:SqlDataSource>
                       
    </form>
  </body>
</html>

<%@ 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 DepartmentsListView_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) 
  
    MessageLabel.Text = "The key value is " & _
      DepartmentsListView.SelectedValue.ToString() & "."

  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView SelectedValue Example</title>
    <style type="text/css">
      .header
      {
        border: 1px solid #008080;
        background-color: #008080;
        color: White;
      }
      .item td { border: 1px solid #008080; }
      .selection td  
      {
        border: 1px solid #008080; 
        background-color: #7FFF00;
      }
    </style>
  </head>
  <body>
    <form id="form1" runat="server">
    
      <h3>ListView SelectedValue Example</h3>
            
      <asp:ListView runat="server" 
        ID="DepartmentsListView"
        DataSourceID="DepartmentDataSource" 
        DataKeyNames="DepartmentID" 
        OnSelectedIndexChanged="DepartmentsListView_SelectedIndexChanged">
        <LayoutTemplate>
          <b>Department List</b>
          <br />
          <table width="500px" runat="server" id="tblDepartments">
            <tr class="header" runat="server">
              <th runat="server">&nbsp;</th>
              <th runat="server">Department Name</th>
              <th runat="server">Group Name</th>
            </tr>
            <tr runat="server" id="itemPlaceholder" />
          </table>
        </LayoutTemplate>
        <ItemTemplate>
          <tr class="item" runat="server">
            <td>
              <asp:LinkButton runat="server" 
                ID="SelectButton" 
                Text="Select"
                CommandName="Select" />
            </td>
            <td>
              <asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
            </td>
            <td>
              <asp:Label runat="server" ID="GroupNameLabel" Text='<%#Eval("GroupName") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <SelectedItemTemplate>
          <tr class="selection" runat="server">
            <td>&nbsp;</td>
            <td>
              <asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
            </td>
            <td>
              <asp:Label runat="server" ID="GroupNameLabel" Text='<%#Eval("GroupName") %>' />
            </td>
          </tr>
        </SelectedItemTemplate>
      </asp:ListView>
      <br/>
      
      <asp:Label ID="MessageLabel"
        ForeColor="Red"
        runat="server"/>

      <!-- This example uses Microsoft SQL Server and connects      -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
      <!-- expression to retrieve the connection string value       -->
      <!-- from the Web.config file.                                -->
      <asp:SqlDataSource ID="DepartmentDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT DepartmentID, Name, GroupName 
          FROM HumanResources.Department">
      </asp:SqlDataSource>
                       
    </form>
  </body>
</html>

설명

속성은 DataKeyNames 데이터 원본의 기본 키를 나타내는 필드 이름의 쉼표로 구분된 목록으로 설정할 수 있습니다. 설정된 경우 컨트롤은 ListView 지정된 필드 또는 필드의 값 또는 값을 사용하여 컨트롤의 각 항목에 대한 개체를 자동으로 만듭니다 DataKey . DataKey 그런 다음 개체가 컨트롤의 DataKeys 컬렉션에 추가됩니다.

일반적으로 속성은 DataKeys 컨트롤의 DataKey 특정 데이터 항목 ListView 에 대한 개체를 가져오는 데 사용됩니다. 그러나 현재 선택한 항목의 개체만 DataKey 얻으려면 속성을 바로 가기로 사용할 SelectedDataKey 수 있습니다. 속성을 사용하여 SelectedValue 선택한 항목의 첫 번째 키 필드의 데이터 키 값을 직접 확인할 수도 있습니다.

개체를 ControlParameter 만들고 첫 번째 필드가 아닌 키 필드에 액세스하려는 경우 속성을 사용합니다 SelectedDataKey . 예를 들어 참조 된 SelectedDataKey 속성입니다.

적용 대상

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