ListView.InsertNewItem(Boolean) Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Inserts the current record in the data source.
public:
virtual void InsertNewItem(bool causesValidation);public virtual void InsertNewItem (bool causesValidation);abstract member InsertNewItem : bool -> unit
override this.InsertNewItem : bool -> unitPublic Overridable Sub InsertNewItem (causesValidation As Boolean)Parameters
- causesValidation
- Boolean
true to perform page validation when this method is called; otherwise, false.
Exceptions
The ListView control does not have an insert item.
-or-
The DataSourceView object associated with the ListView control is null.
Examples
The following example shows how to use the InsertNewItem method to programmatically insert the contents of the insert item of a ListView control into the data source.
Important
This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.
<%@ 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>
Remarks
Use the InsertNewItem method to programmatically insert an item in the data source. This method is typically used to insert an item from outside the ListView control, such as from a different control on the page.
To use the InsertNewItem method, you must define an InsertItemTemplate template in the ListView control. You must also set the InsertItemPosition property to a value different from InsertItemPosition.None. To specify whether page validation is performed before the insert operation, use the causesValidation parameter.
This method raises the ItemInserted and ItemInserting events.
Applies to
See also
Werk met ons samen op GitHub
De bron voor deze inhoud vindt u op GitHub, waar u ook problemen en pull-aanvragen kunt maken en bekijken. Raadpleeg onze gids voor inzenders voor meer informatie.
