ListView.InsertNewItem(Boolean) 方法

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.Extensions.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

将当前记录插入到数据源中。

public:
 virtual void InsertNewItem(bool causesValidation);

public virtual void InsertNewItem (bool causesValidation);

abstract member InsertNewItem : bool -> unit
override this.InsertNewItem : bool -> unit

Public Overridable Sub InsertNewItem (causesValidation As Boolean)

参数

causesValidation: Boolean

true 表示在调用此方法时执行页面验证；否则为 false。

例外

InvalidOperationException

ListView 控件没有插入项。

- 或 -

与 DataSourceView 控件相关联的 ListView 对象为 null。

示例

以下示例演示如何使用 InsertNewItem 方法以编程方式将控件的插入项 ListView 的内容插入数据源。

重要

此示例具有一个接受用户输入的文本框，这是一个潜在的安全威胁。默认情况下，ASP.NET 网页验证用户输入是否不包含脚本或 HTML 元素。有关详细信息，请参阅脚本侵入概述。

<%@ 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 InsertButton_Click(object sender, EventArgs e)
  {
    // Clears any existing message.
    MessageLabel.Text = "";
    
    // Use the InsertNewItem method to programmatically insert
    // the current record in the ListView control.
    DepartmentsListView.InsertNewItem(true);
  }

  protected void DepartmentsListView_ItemInserted(object sender, 
    ListViewInsertedEventArgs e)
  {
    // Handles exceptions that might occur
    // during the insert operation.
    if (e.Exception != null)
    {
      if (e.AffectedRows == 0)
      {
        e.KeepInInsertMode = true;
        MessageLabel.Text = "An exception occurred inserting the new department. " +
                            "Please verify your values and try again.";
      }
      else
        MessageLabel.Text = "An exception occurred inserting the new department. " +
                            "Please verify the values in the newly inserted item.";

      e.ExceptionHandled = true;
    }
  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView InsertNewItem Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView InsertNewItem Example</h3>
      
      <h5>Departments</h5>

      <asp:ListView ID="DepartmentsListView" 
        DataSourceID="DepartmentsDataSource" 
        DataKeyNames="DepartmentID"
        InsertItemPosition="FirstItem"
        OnItemInserted="DepartmentsListView_ItemInserted"
        runat="server" >
        <LayoutTemplate>
          <table runat="server" id="tblDepartments" width="640px" border="1">
            <tr runat="server" id="itemPlaceholder" />
          </table>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td>
              <asp:Label ID="NameLabel" runat="Server" Text='<%#Eval("Name") %>' />
            </td>
            <td>
              <asp:Label ID="GroupNameLabel" runat="Server" Text='<%#Eval("GroupName") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#00BFFF">
            <td>
              <asp:Label runat="server" ID="NameLabel" AssociatedControlID="NameTextBox" 
                Text="Name:" Font-Bold="true"/><br />
              <asp:TextBox ID="NameTextBox" runat="server" Text='<%#Bind("Name") %>' />
            </td>
            <td>
              <asp:Label runat="server" ID="GroupNameLabel" AssociatedControlID="GroupNameTextBox" 
                Text="Group Name:" Font-Bold="true" /><br />
              <asp:TextBox ID="GroupNameTextBox" runat="server" 
                Text='<%#Bind("GroupName") %>' MaxLength="50" />
            </td>
          </tr>
        </InsertItemTemplate>
      </asp:ListView><br />
              
      <asp:Label ID="MessageLabel"
        ForeColor="Red"
        runat="server" /> <br />

      <asp:Button ID="InsertButton"
        Text="Insert new record"
        OnClick="InsertButton_Click"
        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="DepartmentsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT DepartmentID, Name, GroupName FROM HumanResources.Department"
        InsertCommand="INSERT INTO HumanResources.Department(Name, GroupName) 
                VALUES (@Name, @GroupName)">
      </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 InsertButton_Click(ByVal sender As Object, _
                                   ByVal e As EventArgs)
    
    ' Clears any existing message.
    MessageLabel.Text = ""
    
    ' Use the InsertNewItem method to programmatically insert
    ' the current record in the ListView control.
    DepartmentsListView.InsertNewItem(True)
    
  End Sub

  Protected Sub DepartmentsListView_ItemInserted(ByVal sender As Object, _
                                                 ByVal e As ListViewInsertedEventArgs)
  
    ' Handles exceptions that might occur
    ' during the insert operation.
    If Not (e.Exception Is Nothing) Then
      If e.AffectedRows = 0 Then
        e.KeepInInsertMode = True
        MessageLabel.Text = "An exception occurred inserting the new department. " & _
              "Please verify your values and try again."
      Else
        MessageLabel.Text = "An exception occurred inserting the new department. " & _
              "Please verify the values in the newly inserted item."
      End If
        
      e.ExceptionHandled = True
    End If

  End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView InsertNewItem Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView InsertNewItem Example</h3>
      
      <h5>Departments</h5>

      <asp:ListView ID="DepartmentsListView" 
        DataSourceID="DepartmentsDataSource" 
        DataKeyNames="DepartmentID"
        InsertItemPosition="FirstItem"
        OnItemInserted="DepartmentsListView_ItemInserted"
        runat="server" >
        <LayoutTemplate>
          <table runat="server" id="tblDepartments" width="640px" border="1">
            <tr runat="server" id="itemPlaceholder" />
          </table>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td>
              <asp:Label ID="NameLabel" runat="Server" Text='<%#Eval("Name") %>' />
            </td>
            <td>
              <asp:Label ID="GroupNameLabel" runat="Server" Text='<%#Eval("GroupName") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#00BFFF">
            <td>
              <asp:Label runat="server" ID="NameLabel" AssociatedControlID="NameTextBox" 
                Text="Name:" Font-Bold="true"/><br />
              <asp:TextBox ID="NameTextBox" runat="server" Text='<%#Bind("Name") %>' />
            </td>
            <td>
              <asp:Label runat="server" ID="GroupNameLabel" AssociatedControlID="GroupNameTextBox" 
                Text="Group Name:" Font-Bold="true" /><br />
              <asp:TextBox ID="GroupNameTextBox" runat="server" 
                Text='<%#Bind("GroupName") %>' MaxLength="50" />
            </td>
          </tr>
        </InsertItemTemplate>
      </asp:ListView><br />
              
      <asp:Label ID="MessageLabel"
        ForeColor="Red"
        runat="server" /> <br />

      <asp:Button ID="InsertButton"
        Text="Insert new record"
        OnClick="InsertButton_Click"
        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="DepartmentsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT DepartmentID, Name, GroupName FROM HumanResources.Department"
        InsertCommand="INSERT INTO HumanResources.Department(Name, GroupName) 
                VALUES (@Name, @GroupName)">
      </asp:SqlDataSource>
      
    </form>
  </body>
</html>

注解

InsertNewItem使用方法以编程方式在数据源中插入项。此方法通常用于从控件外部 ListView 插入项，例如从页面上的其他控件插入项。

若要使用 InsertNewItem 方法，必须在控件中ListView定义模板InsertItemTemplate。还必须将 InsertItemPosition 属性设置为不同于 InsertItemPosition.None的值。若要指定是否在插入操作之前执行页面验证，请使用 causesValidation 参数。

此方法引发 ItemInserted 和 ItemInserting 事件。

适用于

通过

ListView.InsertNewItem(Boolean) 方法

定义

参数

例外

示例

注解

适用于

另请参阅

其他资源