Beispiel für ein ObjectDataSource-Quellobjekt mit strikter Typbindung
Aktualisiert: November 2007
Veranschaulicht ein benutzerdefiniertes Geschäftsobjekt der mittleren Ebene, das mit einem ObjectDataSource-Steuerelement verwendet werden kann.
Beispiel
Beschreibung
Das folgende Codebeispiel zeigt ein benutzerdefiniertes Geschäftsobjekt der mittleren Ebene, das mit einem ObjectDataSource-Steuerelement verwendet werden kann, welches mithilfe der DataObjectTypeName-Eigenschaft ein Quellobjekt mit strikter Typbindung angibt. Dieses Thema veranschaulicht außerdem eine ASP.NET-Beispielseite, die das Geschäftsobjekt als Quelle für ein ObjectDataSource-Steuerelement verwendet. Die Seite enthält ein GridView-Steuerelement und ein DetailsView-Steuerelement, die an das ObjectDataSource-Steuerelement gebunden sind.
Um den Code zu verwenden, erstellen Sie im Unterverzeichnis App_Code der Webanwendung eine Codedatei, und kopieren Sie den Code in die Datei. Das Geschäftsobjekt wird dann dynamisch kompiliert und als Teil der Webanwendung eingefügt. Alternativ können Sie das Geschäftsobjekt kompilieren und es in das Verzeichnis Bin einer ASP.NET-Anwendung oder in den globalen Assemblycache (GAC) einfügen. Weitere Informationen über das Verzeichnis App_Code sowie das Verzeichnis Bin finden Sie unter Ordner für freigegebenen Code in ASP.NET-Websites.
Code
Imports System
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Collections.Generic
Imports System.Web.UI
Imports System.Web.UI.WebControls
Namespace Samples.AspNet.ObjectDataSource
Public Class NorthwindEmployee
Private _employeeID As Integer
Private _lastName As String
Private _firstName As String
Private _address As String
Private _city As String
Private _region As String
Private _postalCode As String
Public Sub New()
End Sub
Public Property EmployeeID As Integer
Get
Return _employeeID
End Get
Set
_employeeID = value
End Set
End Property
Public Property LastName As String
Get
Return _lastName
End Get
Set
_lastName = value
End Set
End Property
Public Property FirstName As String
Get
Return _firstName
End Get
Set
_firstName = value
End Set
End Property
Public Property Address As String
Get
Return _address
End Get
Set
_address = value
End Set
End Property
Public Property City As String
Get
Return _city
End Get
Set
_city = value
End Set
End Property
Public Property Region As String
Get
Return _region
End Get
Set
_region = value
End Set
End Property
Public Property PostalCode As String
Get
Return _postalCode
End Get
Set
_postalCode = value
End Set
End Property
End Class
'
' Northwind Employee Data Factory
'
Public Class NorthwindEmployeeData
Private _connectionString As String
Public Sub New()
Initialize()
End Sub
Public Sub Initialize()
' Initialize data source. Use "Northwind" connection string from configuration.
If ConfigurationManager.ConnectionStrings("Northwind") Is Nothing OrElse _
ConfigurationManager.ConnectionStrings("Northwind").ConnectionString.Trim() = "" Then
Throw New Exception("A connection string named 'Northwind' with a valid connection string " & _
"must exist in the <connectionStrings> configuration section for the application.")
End If
_connectionString = _
ConfigurationManager.ConnectionStrings("Northwind").ConnectionString
End Sub
' Select all employees.
Public Function GetAllEmployees(sortColumns As String, startRecord As Integer, _
maxRecords As Integer) As List(of NorthwindEmployee)
VerifySortColumns(sortColumns)
Dim sqlCmd As String = "SELECT EmployeeID, LastName, FirstName, Address, City, Region, PostalCode FROM Employees "
If sortColumns.Trim() = "" Then
sqlCmd &= "ORDER BY EmployeeID"
Else
sqlCmd &= "ORDER BY " & sortColumns
End If
Dim conn As SqlConnection = New SqlConnection(_connectionString)
Dim cmd As SqlCommand = New SqlCommand(sqlCmd, conn)
Dim reader As SqlDataReader = Nothing
Dim employees As List(of NorthwindEmployee) = New List(of NorthwindEmployee)()
Dim count As Integer = 0
Try
conn.Open()
reader = cmd.ExecuteReader()
Do While reader.Read()
If count >= startRecord Then
If employees.Count < maxRecords Then
employees.Add(GetNorthwindEmployeeFromReader(reader))
Else
cmd.Cancel()
End If
End If
count += 1
Loop
Catch e As SqlException
' Handle exception.
Finally
If reader IsNot Nothing Then reader.Close()
conn.Close()
End Try
Return employees
End Function
'''''
' Verify that only valid columns are specified in the sort expression to aSub a SQL Injection attack.
Private Sub VerifySortColumns(sortColumns As String)
If sortColumns.ToLowerInvariant().EndsWith(" desc") Then _
sortColumns = sortColumns.Substring(0, sortColumns.Length - 5)
Dim columnNames() As String = sortColumns.Split(",")
For Each columnName As String In columnNames
Select Case columnName.Trim().ToLowerInvariant()
Case "employeeid"
Case "lastname"
Case "firstname"
Case ""
Case Else
Throw New ArgumentException("SortColumns contains an invalid column name.")
End Select
Next
End Sub
Private Function GetNorthwindEmployeeFromReader(reader As SqlDataReader) As NorthwindEmployee
Dim employee As NorthwindEmployee = New NorthwindEmployee()
employee.EmployeeID = reader.GetInt32(0)
employee.LastName = reader.GetString(1)
employee.FirstName = reader.GetString(2)
If reader.GetValue(3) IsNot DBNull.Value Then _
employee.Address = reader.GetString(3)
If reader.GetValue(4) IsNot DBNull.Value Then _
employee.City = reader.GetString(4)
If reader.GetValue(5) IsNot DBNull.Value Then _
employee.Region = reader.GetString(5)
If reader.GetValue(6) IsNot DBNull.Value Then _
employee.PostalCode = reader.GetString(6)
Return employee
End Function
' Select an employee.
Public Function GetEmployee(EmployeeID As Integer) As List(of NorthwindEmployee)
Dim conn As SqlConnection = New SqlConnection(_connectionString)
Dim cmd As SqlCommand = _
New SqlCommand("SELECT EmployeeID, LastName, FirstName, Address, City, Region, PostalCode " & _
" FROM Employees WHERE EmployeeID = @EmployeeID", conn)
cmd.Parameters.Add("@EmployeeID", SqlDbType.Int).Value = EmployeeID
Dim reader As SqlDataReader = Nothing
Dim employees As List(of NorthwindEmployee) = New List(of NorthwindEmployee)()
Try
conn.Open()
reader = cmd.ExecuteReader(CommandBehavior.SingleRow)
Do While reader.Read()
employees.Add(GetNorthwindEmployeeFromReader(reader))
Loop
Catch e As SqlException
' Handle exception.
Finally
If reader IsNot Nothing Then reader.Close()
conn.Close()
End Try
Return employees
End Function
'
' Update the Employee by ID.
' This method assumes that ConflictDetection is Set to OverwriteValues.
Public Function UpdateEmployee(employee As NorthwindEmployee) As Integer
If String.IsNullOrEmpty(employee.FirstName) Then _
Throw New ArgumentException("FirstName cannot be null or an empty string.")
If String.IsNullOrEmpty(employee.LastName) Then _
Throw New ArgumentException("LastName cannot be null or an empty string.")
If employee.Address Is Nothing Then employee.Address = String.Empty
If employee.City Is Nothing Then employee.City = String.Empty
If employee.Region Is Nothing Then employee.Region = String.Empty
If employee.PostalCode Is Nothing Then employee.PostalCode = String.Empty
Dim conn As SqlConnection = New SqlConnection(_connectionString)
Dim cmd As SqlCommand = New SqlCommand("UPDATE Employees " & _
" SET FirstName=@FirstName, LastName=@LastName, " & _
" Address=@Address, City=@City, Region=@Region, " & _
" PostalCode=@PostalCode " & _
" WHERE EmployeeID=@EmployeeID", conn)
cmd.Parameters.Add("@FirstName", SqlDbType.VarChar, 10).Value = employee.FirstName
cmd.Parameters.Add("@LastName", SqlDbType.VarChar, 20).Value = employee.LastName
cmd.Parameters.Add("@Address", SqlDbType.VarChar, 60).Value = employee.Address
cmd.Parameters.Add("@City", SqlDbType.VarChar, 15).Value = employee.City
cmd.Parameters.Add("@Region", SqlDbType.VarChar, 15).Value = employee.Region
cmd.Parameters.Add("@PostalCode", SqlDbType.VarChar, 10).Value = employee.PostalCode
cmd.Parameters.Add("@EmployeeID", SqlDbType.Int).Value = employee.EmployeeID
Dim result As Integer = 0
Try
conn.Open()
result = cmd.ExecuteNonQuery()
Catch e As SqlException
' Handle exception.
Finally
conn.Close()
End Try
Return result
End Function
' Insert an Employee.
Public Function InsertEmployee(employee As NorthwindEmployee) As Integer
If String.IsNullOrEmpty(employee.FirstName) Then _
Throw New ArgumentException("FirstName cannot be null or an empty string.")
If String.IsNullOrEmpty(employee.LastName) Then _
Throw New ArgumentException("LastName cannot be null or an empty string.")
If employee.Address Is Nothing Then employee.Address = String.Empty
If employee.City Is Nothing Then employee.City = String.Empty
If employee.Region Is Nothing Then employee.Region = String.Empty
If employee.PostalCode Is Nothing Then employee.PostalCode = String.Empty
Dim conn As SqlConnection = New SqlConnection(_connectionString)
Dim cmd As SqlCommand = New SqlCommand("INSERT INTO Employees " & _
" (FirstName, LastName, Address, City, Region, PostalCode) " & _
" Values(@FirstName, @LastName, @Address, @City, @Region, @PostalCode) " & _
"SELECT @EmployeeID = SCOPE_IDENTITY()", conn)
cmd.Parameters.Add("@FirstName", SqlDbType.VarChar, 10).Value = employee.FirstName
cmd.Parameters.Add("@LastName", SqlDbType.VarChar, 20).Value = employee.LastName
cmd.Parameters.Add("@Address", SqlDbType.VarChar, 60).Value = employee.Address
cmd.Parameters.Add("@City", SqlDbType.VarChar, 15).Value = employee.City
cmd.Parameters.Add("@Region", SqlDbType.VarChar, 15).Value = employee.Region
cmd.Parameters.Add("@PostalCode", SqlDbType.VarChar, 10).Value = employee.PostalCode
Dim p As SqlParameter = cmd.Parameters.Add("@EmployeeID", SqlDbType.Int)
p.Direction = ParameterDirection.Output
Dim newEmployeeID As Integer= 0
Try
conn.Open()
cmd.ExecuteNonQuery()
newEmployeeID = CInt(p.Value)
Catch e As SqlException
' Handle exception.
Finally
conn.Close()
End Try
Return newEmployeeID
End Function
'
' Delete the Employee by ID.
' This method assumes that ConflictDetection is Set to OverwriteValues.
Public Function DeleteEmployee(employee As NorthwindEmployee) As Integer
Dim sqlCmd As String = "DELETE FROM Employees WHERE EmployeeID = @EmployeeID"
Dim conn As SqlConnection = New SqlConnection(_connectionString)
Dim cmd As SqlCommand = New SqlCommand(sqlCmd, conn)
cmd.Parameters.Add("@EmployeeID", SqlDbType.Int).Value = employee.EmployeeID
Dim result As Integer = 0
Try
conn.Open()
result = cmd.ExecuteNonQuery()
Catch e As SqlException
' Handle exception.
Finally
conn.Close()
End Try
Return result
End Function
End Class
End Namespace
using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Samples.AspNet.ObjectDataSource
{
public class NorthwindEmployee
{
private int _employeeID;
private string _lastName;
private string _firstName;
private string _address;
private string _city;
private string _region;
private string _postalCode;
public NorthwindEmployee()
{
}
public int EmployeeID
{
get { return _employeeID; }
set { _employeeID = value; }
}
public string LastName
{
get { return _lastName; }
set { _lastName = value; }
}
public string FirstName
{
get { return _firstName; }
set { _firstName = value; }
}
public string Address
{
get { return _address; }
set { _address = value; }
}
public string City
{
get { return _city; }
set { _city = value; }
}
public string Region
{
get { return _region; }
set { _region = value; }
}
public string PostalCode
{
get { return _postalCode; }
set { _postalCode = value; }
}
}
//
// Northwind Employee Data Factory
//
public class NorthwindEmployeeData
{
private string _connectionString;
public NorthwindEmployeeData()
{
Initialize();
}
public void Initialize()
{
// Initialize data source. Use "Northwind" connection string from configuration.
if (ConfigurationManager.ConnectionStrings["Northwind"] == null ||
ConfigurationManager.ConnectionStrings["Northwind"].ConnectionString.Trim() == "")
{
throw new Exception("A connection string named 'Northwind' with a valid connection string " +
"must exist in the <connectionStrings> configuration section for the application.");
}
_connectionString =
ConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
}
// Select all employees.
public List<NorthwindEmployee> GetAllEmployees(string sortColumns, int startRecord, int maxRecords)
{
VerifySortColumns(sortColumns);
string sqlCmd = "SELECT EmployeeID, LastName, FirstName, Address, City, Region, PostalCode FROM Employees ";
if (sortColumns.Trim() == "")
sqlCmd += "ORDER BY EmployeeID";
else
sqlCmd += "ORDER BY " + sortColumns;
SqlConnection conn = new SqlConnection(_connectionString);
SqlCommand cmd = new SqlCommand(sqlCmd, conn);
SqlDataReader reader = null;
List<NorthwindEmployee> employees = new List<NorthwindEmployee>();
int count = 0;
try
{
conn.Open();
reader = cmd.ExecuteReader();
while (reader.Read())
{
if (count >= startRecord)
{
if (employees.Count < maxRecords)
employees.Add(GetNorthwindEmployeeFromReader(reader));
else
cmd.Cancel();
}
count++;
}
}
catch (SqlException e)
{
// Handle exception.
}
finally
{
if (reader != null) { reader.Close(); }
conn.Close();
}
return employees;
}
//////////
// Verify that only valid columns are specified in the sort expression to avoid a SQL Injection attack.
private void VerifySortColumns(string sortColumns)
{
if (sortColumns.ToLowerInvariant().EndsWith(" desc"))
sortColumns = sortColumns.Substring(0, sortColumns.Length - 5);
string[] columnNames = sortColumns.Split(',');
foreach (string columnName in columnNames)
{
switch (columnName.Trim().ToLowerInvariant())
{
case "employeeid":
break;
case "lastname":
break;
case "firstname":
break;
case "":
break;
default:
throw new ArgumentException("SortColumns contains an invalid column name.");
break;
}
}
}
private NorthwindEmployee GetNorthwindEmployeeFromReader(SqlDataReader reader)
{
NorthwindEmployee employee = new NorthwindEmployee();
employee.EmployeeID = reader.GetInt32(0);
employee.LastName = reader.GetString(1);
employee.FirstName = reader.GetString(2);
if (reader.GetValue(3) != DBNull.Value)
employee.Address = reader.GetString(3);
if (reader.GetValue(4) != DBNull.Value)
employee.City = reader.GetString(4);
if (reader.GetValue(5) != DBNull.Value)
employee.Region = reader.GetString(5);
if (reader.GetValue(6) != DBNull.Value)
employee.PostalCode = reader.GetString(6);
return employee;
}
// Select an employee.
public List<NorthwindEmployee> GetEmployee(int EmployeeID)
{
SqlConnection conn = new SqlConnection(_connectionString);
SqlCommand cmd =
new SqlCommand("SELECT EmployeeID, LastName, FirstName, Address, City, Region, PostalCode " +
" FROM Employees WHERE EmployeeID = @EmployeeID", conn);
cmd.Parameters.Add("@EmployeeID", SqlDbType.Int).Value = EmployeeID;
SqlDataReader reader = null;
List<NorthwindEmployee> employees = new List<NorthwindEmployee>();
try
{
conn.Open();
reader = cmd.ExecuteReader(CommandBehavior.SingleRow);
while (reader.Read())
employees.Add(GetNorthwindEmployeeFromReader(reader));
}
catch (SqlException e)
{
// Handle exception.
}
finally
{
if (reader != null) { reader.Close(); }
conn.Close();
}
return employees;
}
//
// Update the Employee by ID.
// This method assumes that ConflictDetection is set to OverwriteValues.
public int UpdateEmployee(NorthwindEmployee employee)
{
if (String.IsNullOrEmpty(employee.FirstName))
throw new ArgumentException("FirstName cannot be null or an empty string.");
if (String.IsNullOrEmpty(employee.LastName))
throw new ArgumentException("LastName cannot be null or an empty string.");
if (employee.Address == null) { employee.Address = String.Empty; }
if (employee.City == null) { employee.City = String.Empty; }
if (employee.Region == null) { employee.Region = String.Empty; }
if (employee.PostalCode == null) { employee.PostalCode = String.Empty; }
SqlConnection conn = new SqlConnection(_connectionString);
SqlCommand cmd = new SqlCommand("UPDATE Employees " +
" SET FirstName=@FirstName, LastName=@LastName, " +
" Address=@Address, City=@City, Region=@Region, " +
" PostalCode=@PostalCode " +
" WHERE EmployeeID=@EmployeeID", conn);
cmd.Parameters.Add("@FirstName", SqlDbType.VarChar, 10).Value = employee.FirstName;
cmd.Parameters.Add("@LastName", SqlDbType.VarChar, 20).Value = employee.LastName;
cmd.Parameters.Add("@Address", SqlDbType.VarChar, 60).Value = employee.Address;
cmd.Parameters.Add("@City", SqlDbType.VarChar, 15).Value = employee.City;
cmd.Parameters.Add("@Region", SqlDbType.VarChar, 15).Value = employee.Region;
cmd.Parameters.Add("@PostalCode", SqlDbType.VarChar, 10).Value = employee.PostalCode;
cmd.Parameters.Add("@EmployeeID", SqlDbType.Int).Value = employee.EmployeeID;
int result = 0;
try
{
conn.Open();
result = cmd.ExecuteNonQuery();
}
catch (SqlException e)
{
// Handle exception.
}
finally
{
conn.Close();
}
return result;
}
// Insert an Employee.
public int InsertEmployee(NorthwindEmployee employee)
{
if (String.IsNullOrEmpty(employee.FirstName))
throw new ArgumentException("FirstName cannot be null or an empty string.");
if (String.IsNullOrEmpty(employee.LastName))
throw new ArgumentException("LastName cannot be null or an empty string.");
if (employee.Address == null) { employee.Address = String.Empty; }
if (employee.City == null) { employee.City = String.Empty; }
if (employee.Region == null) { employee.Region = String.Empty; }
if (employee.PostalCode == null) { employee.PostalCode = String.Empty; }
SqlConnection conn = new SqlConnection(_connectionString);
SqlCommand cmd = new SqlCommand("INSERT INTO Employees " +
" (FirstName, LastName, Address, City, Region, PostalCode) " +
" Values(@FirstName, @LastName, @Address, @City, @Region, @PostalCode); " +
"SELECT @EmployeeID = SCOPE_IDENTITY()", conn);
cmd.Parameters.Add("@FirstName", SqlDbType.VarChar, 10).Value = employee.FirstName;
cmd.Parameters.Add("@LastName", SqlDbType.VarChar, 20).Value = employee.LastName;
cmd.Parameters.Add("@Address", SqlDbType.VarChar, 60).Value = employee.Address;
cmd.Parameters.Add("@City", SqlDbType.VarChar, 15).Value = employee.City;
cmd.Parameters.Add("@Region", SqlDbType.VarChar, 15).Value = employee.Region;
cmd.Parameters.Add("@PostalCode", SqlDbType.VarChar, 10).Value = employee.PostalCode;
SqlParameter p = cmd.Parameters.Add("@EmployeeID", SqlDbType.Int);
p.Direction = ParameterDirection.Output;
int newEmployeeID = 0;
try
{
conn.Open();
cmd.ExecuteNonQuery();
newEmployeeID = (int)p.Value;
}
catch (SqlException e)
{
// Handle exception.
}
finally
{
conn.Close();
}
return newEmployeeID;
}
//
// Delete the Employee by ID.
// This method assumes that ConflictDetection is set to OverwriteValues.
public int DeleteEmployee(NorthwindEmployee employee)
{
string sqlCmd = "DELETE FROM Employees WHERE EmployeeID = @EmployeeID";
SqlConnection conn = new SqlConnection(_connectionString);
SqlCommand cmd = new SqlCommand(sqlCmd, conn);
cmd.Parameters.Add("@EmployeeID", SqlDbType.Int).Value = employee.EmployeeID;
int result = 0;
try
{
conn.Open();
result = cmd.ExecuteNonQuery();
}
catch (SqlException e)
{
// Handle exception.
}
finally
{
conn.Close();
}
return result;
}
}
}
<%@ Page language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script >
Sub EmployeesDetailsView_ItemInserted(sender As Object, e As DetailsViewInsertedEventArgs)
EmployeesGridView.DataBind()
End Sub
Sub EmployeesDetailsView_ItemUpdated(sender As Object, e As DetailsViewUpdatedEventArgs)
EmployeesGridView.DataBind()
End Sub
Sub EmployeesDetailsView_ItemDeleted(sender As Object, e As DetailsViewDeletedEventArgs)
EmployeesGridView.DataBind()
End Sub
Sub EmployeesGridView_OnSelectedIndexChanged(sender As Object, e As EventArgs)
EmployeeDetailsObjectDataSource.SelectParameters("EmployeeID").DefaultValue = _
EmployeesGridView.SelectedDataKey.Value.ToString()
EmployeesDetailsView.DataBind()
End Sub
Sub EmployeeDetailsObjectDataSource_OnInserted(sender As Object, e As ObjectDataSourceStatusEventArgs)
EmployeeDetailsObjectDataSource.SelectParameters("EmployeeID").DefaultValue = _
e.ReturnValue.ToString()
EmployeesDetailsView.DataBind()
End Sub
Sub EmployeeDetailsObjectDataSource_OnUpdated(sender As Object, e As ObjectDataSourceStatusEventArgs)
If CInt(e.ReturnValue) = 0 Then _
Msg.Text = "Employee was not updated. Please try again."
End Sub
Sub EmployeeDetailsObjectDataSource_OnDeleted(sender As Object, e As ObjectDataSourceStatusEventArgs)
If CInt(e.ReturnValue) = 0 Then _
Msg.Text = "Employee was not deleted. Please try again."
End Sub
Sub Page_Load()
Msg.Text = ""
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head >
<title>ObjectDataSource Example</title>
</head>
<body>
<form id="form1" >
<h3>ObjectDataSource Example</h3>
<asp:Label id="Msg" ForeColor="Red" />
<asp:ObjectDataSource
ID="EmployeesObjectDataSource"
TypeName="Samples.AspNet.ObjectDataSource.NorthwindEmployeeData"
DataObjectTypeName="Samples.AspNet.ObjectDataSource.NorthwindEmployee"
SortParameterName="SortColumns"
EnablePaging="true"
StartRowIndexParameterName="StartRecord"
MaximumRowsParameterName="MaxRecords"
SelectMethod="GetAllEmployees" >
</asp:ObjectDataSource>
<asp:ObjectDataSource
ID="EmployeeDetailsObjectDataSource"
TypeName="Samples.AspNet.ObjectDataSource.NorthwindEmployeeData"
DataObjectTypeName="Samples.AspNet.ObjectDataSource.NorthwindEmployee"
SelectMethod="GetEmployee"
InsertMethod="InsertEmployee"
UpdateMethod="UpdateEmployee"
DeleteMethod="DeleteEmployee"
OnInserted="EmployeeDetailsObjectDataSource_OnInserted"
OnUpdated="EmployeeDetailsObjectDataSource_OnUpdated"
OnDeleted="EmployeeDetailsObjectDataSource_OnDeleted">
<SelectParameters>
<asp:Parameter Name="EmployeeID" Type="Int32" />
</SelectParameters>
</asp:ObjectDataSource>
<table cellspacing="10">
<tr>
<td valign="top">
<asp:GridView ID="EmployeesGridView"
DataSourceID="EmployeesObjectDataSource"
AutoGenerateColumns="false"
AllowSorting="true"
AllowPaging="true"
PageSize="5"
DataKeyNames="EmployeeID"
OnSelectedIndexChanged="EmployeesGridView_OnSelectedIndexChanged"
RunAt="server">
<HeaderStyle backcolor="lightblue" forecolor="black"/>
<Columns>
<asp:ButtonField Text="Details..."
HeaderText="Show Details"
CommandName="Select"/>
<asp:BoundField DataField="EmployeeID" HeaderText="Employee ID" SortExpression="EmployeeID" />
<asp:BoundField DataField="FirstName" HeaderText="First Name" SortExpression="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="Last Name" SortExpression="LastName, FirstName" />
</Columns>
</asp:GridView>
</td>
<td valign="top">
<asp:DetailsView ID="EmployeesDetailsView"
DataSourceID="EmployeeDetailsObjectDataSource"
AutoGenerateRows="false"
EmptyDataText="No records."
DataKeyNames="EmployeeID"
Gridlines="Both"
AutoGenerateInsertButton="true"
AutoGenerateEditButton="true"
AutoGenerateDeleteButton="true"
OnItemInserted="EmployeesDetailsView_ItemInserted"
OnItemUpdated="EmployeesDetailsView_ItemUpdated"
OnItemDeleted="EmployeesDetailsView_ItemDeleted"
RunAt="server">
<HeaderStyle backcolor="Navy" forecolor="White"/>
<RowStyle backcolor="White"/>
<AlternatingRowStyle backcolor="LightGray"/>
<EditRowStyle backcolor="LightCyan"/>
<Fields>
<asp:BoundField DataField="EmployeeID" HeaderText="Employee ID" InsertVisible="False" ReadOnly="true"/>
<asp:BoundField DataField="FirstName" HeaderText="First Name"/>
<asp:BoundField DataField="LastName" HeaderText="Last Name"/>
<asp:BoundField DataField="Address" HeaderText="Address"/>
<asp:BoundField DataField="City" HeaderText="City"/>
<asp:BoundField DataField="Region" HeaderText="Region"/>
<asp:BoundField DataField="PostalCode" HeaderText="Postal Code"/>
</Fields>
</asp:DetailsView>
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ Page language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script >
void EmployeesDetailsView_ItemInserted(Object sender, DetailsViewInsertedEventArgs e)
{
EmployeesGridView.DataBind();
}
void EmployeesDetailsView_ItemUpdated(Object sender, DetailsViewUpdatedEventArgs e)
{
EmployeesGridView.DataBind();
}
void EmployeesDetailsView_ItemDeleted(Object sender, DetailsViewDeletedEventArgs e)
{
EmployeesGridView.DataBind();
}
void EmployeesGridView_OnSelectedIndexChanged(object sender, EventArgs e)
{
EmployeeDetailsObjectDataSource.SelectParameters["EmployeeID"].DefaultValue =
EmployeesGridView.SelectedDataKey.Value.ToString();
EmployeesDetailsView.DataBind();
}
void EmployeeDetailsObjectDataSource_OnInserted(object sender, ObjectDataSourceStatusEventArgs e)
{
EmployeeDetailsObjectDataSource.SelectParameters["EmployeeID"].DefaultValue =
e.ReturnValue.ToString();
EmployeesDetailsView.DataBind();
}
void EmployeeDetailsObjectDataSource_OnUpdated(object sender, ObjectDataSourceStatusEventArgs e)
{
if ((int)e.ReturnValue == 0)
Msg.Text = "Employee was not updated. Please try again.";
}
void EmployeeDetailsObjectDataSource_OnDeleted(object sender, ObjectDataSourceStatusEventArgs e)
{
if ((int)e.ReturnValue == 0)
Msg.Text = "Employee was not deleted. Please try again.";
}
void Page_Load()
{
Msg.Text = "";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head >
<title>ObjectDataSource Example</title>
</head>
<body>
<form id="form1" >
<h3>ObjectDataSource Example</h3>
<asp:Label id="Msg" ForeColor="Red" />
<asp:ObjectDataSource
ID="EmployeesObjectDataSource"
TypeName="Samples.AspNet.ObjectDataSource.NorthwindEmployeeData"
DataObjectTypeName="Samples.AspNet.ObjectDataSource.NorthwindEmployee"
SortParameterName="SortColumns"
EnablePaging="true"
StartRowIndexParameterName="StartRecord"
MaximumRowsParameterName="MaxRecords"
SelectMethod="GetAllEmployees" >
</asp:ObjectDataSource>
<asp:ObjectDataSource
ID="EmployeeDetailsObjectDataSource"
TypeName="Samples.AspNet.ObjectDataSource.NorthwindEmployeeData"
DataObjectTypeName="Samples.AspNet.ObjectDataSource.NorthwindEmployee"
SelectMethod="GetEmployee"
InsertMethod="InsertEmployee"
UpdateMethod="UpdateEmployee"
DeleteMethod="DeleteEmployee"
OnInserted="EmployeeDetailsObjectDataSource_OnInserted"
OnUpdated="EmployeeDetailsObjectDataSource_OnUpdated"
OnDeleted="EmployeeDetailsObjectDataSource_OnDeleted">
<SelectParameters>
<asp:Parameter Name="EmployeeID" Type="Int32" />
</SelectParameters>
</asp:ObjectDataSource>
<table cellspacing="10">
<tr>
<td valign="top">
<asp:GridView ID="EmployeesGridView"
DataSourceID="EmployeesObjectDataSource"
AutoGenerateColumns="false"
AllowSorting="true"
AllowPaging="true"
PageSize="5"
DataKeyNames="EmployeeID"
OnSelectedIndexChanged="EmployeesGridView_OnSelectedIndexChanged"
RunAt="server">
<HeaderStyle backcolor="lightblue" forecolor="black"/>
<Columns>
<asp:ButtonField Text="Details..."
HeaderText="Show Details"
CommandName="Select"/>
<asp:BoundField DataField="EmployeeID" HeaderText="Employee ID" SortExpression="EmployeeID" />
<asp:BoundField DataField="FirstName" HeaderText="First Name" SortExpression="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="Last Name" SortExpression="LastName, FirstName" />
</Columns>
</asp:GridView>
</td>
<td valign="top">
<asp:DetailsView ID="EmployeesDetailsView"
DataSourceID="EmployeeDetailsObjectDataSource"
AutoGenerateRows="false"
EmptyDataText="No records."
DataKeyNames="EmployeeID"
Gridlines="Both"
AutoGenerateInsertButton="true"
AutoGenerateEditButton="true"
AutoGenerateDeleteButton="true"
OnItemInserted="EmployeesDetailsView_ItemInserted"
OnItemUpdated="EmployeesDetailsView_ItemUpdated"
OnItemDeleted="EmployeesDetailsView_ItemDeleted"
RunAt="server">
<HeaderStyle backcolor="Navy" forecolor="White"/>
<RowStyle backcolor="White"/>
<AlternatingRowStyle backcolor="LightGray"/>
<EditRowStyle backcolor="LightCyan"/>
<Fields>
<asp:BoundField DataField="EmployeeID" HeaderText="Employee ID" InsertVisible="False" ReadOnly="true"/>
<asp:BoundField DataField="FirstName" HeaderText="First Name"/>
<asp:BoundField DataField="LastName" HeaderText="Last Name"/>
<asp:BoundField DataField="Address" HeaderText="Address"/>
<asp:BoundField DataField="City" HeaderText="City"/>
<asp:BoundField DataField="Region" HeaderText="Region"/>
<asp:BoundField DataField="PostalCode" HeaderText="Postal Code"/>
</Fields>
</asp:DetailsView>
</td>
</tr>
</table>
</form>
</body>
</html>
Anmerkungen
Das Beispiel erfordert eine Verbindungszeichenfolge für die SQL Server-Beispieldatenbank Northwind. Die Verbindungszeichenfolge muss im <connectionStrings>-Element der Konfigurationsdatei der Anwendung definiert sein. Der connectionStrings-Abschnitt könnte folgendermaßen aussehen:
<configuration>
<system.web>
<connectionStrings>
<add
name="Northwind"
connectionString="Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind;" />
</connectionStrings>
</system.web>
</configuration>