BaseDataBoundControl.DataSource Property
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.
Gets or sets the object from which the data-bound control retrieves its list of data items.
public:
virtual property System::Object ^ DataSource { System::Object ^ get(); void set(System::Object ^ value); };[System.ComponentModel.Bindable(true)]
[System.Web.UI.Themeable(false)]
public virtual object DataSource { get; set; }[<System.ComponentModel.Bindable(true)>]
[<System.Web.UI.Themeable(false)>]
member this.DataSource : obj with get, setPublic Overridable Property DataSource As ObjectProperty Value
An object that represents the data source from which the data-bound control retrieves its data. The default is null.
- Attributes
Examples
The following code example demonstrates how the DataSource property of a data-bound control is used. In this example, the GridView control is bound to a DataSet object. After the DataSource property is set, the DataBind method is called explicitly.
<%@ Page language="C#" %>
<%@ import namespace="System.Data" %>
<%@ import namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
// This example uses Microsoft SQL Server and connects
// to the Northwind sample database. The data source needs
// to be bound to the GridView control only when the
// page is first loaded. Thereafter, the values are
// stored in view state.
if(!IsPostBack)
{
// Declare the query string.
String queryString =
"Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]";
// Run the query and bind the resulting DataSet
// to the GridView control.
DataSet ds = GetData(queryString);
if (ds.Tables.Count > 0)
{
AuthorsGridView.DataSource = ds;
AuthorsGridView.DataBind();
}
else
{
Message.Text = "Unable to connect to the database.";
}
}
}
DataSet GetData(String queryString)
{
// Retrieve the connection string stored in the Web.config file.
String connectionString = ConfigurationManager.ConnectionStrings["NorthWindConnectionString"].ConnectionString;
DataSet ds = new DataSet();
try
{
// Connect to the database and run the query.
SqlConnection connection = new SqlConnection(connectionString);
SqlDataAdapter adapter = new SqlDataAdapter(queryString, connection);
// Fill the DataSet.
adapter.Fill(ds);
}
catch(Exception ex)
{
// The connection failed. Display an error message.
Message.Text = "Unable to connect to the database.";
}
return ds;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView DataBind Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView DataBind Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:gridview id="AuthorsGridView"
autogeneratecolumns="true"
runat="server">
</asp:gridview>
</form>
</body>
</html>
<%@ Page language="VB" %>
<%@ import namespace="System.Data" %>
<%@ import namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' This example uses Microsoft SQL Server and connects
' to the Northwind sample database. The data source needs
' to be bound to the GridView control only when the
' page is first loaded. Thereafter, the values are
' stored in view state.
If Not IsPostBack Then
' Declare the query string.
Dim queryString As String = _
"Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
' Run the query and bind the resulting DataSet
' to the GridView control.
Dim ds As DataSet = GetData(queryString)
If (ds.Tables.Count > 0) Then
AuthorsGridView.DataSource = ds
AuthorsGridView.DataBind()
Else
Message.Text = "Unable to connect to the database."
End If
End If
End Sub
Function GetData(ByVal queryString As String) As DataSet
' Retrieve the connection string stored in the Web.config file.
Dim connectionString As String = ConfigurationManager.ConnectionStrings("NorthWindConnectionString").ConnectionString
Dim ds As New DataSet()
Try
' Connect to the database and run the query.
Dim connection As New SqlConnection(connectionString)
Dim adapter As New SqlDataAdapter(queryString, Connection)
' Fill the DataSet.
Adapter.Fill(ds)
Catch ex As Exception
' The connection failed. Display an error message.
Message.Text = "Unable to connect to the database."
End Try
Return ds
End Function
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView DataBind Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView DataBind Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/>
<asp:gridview id="AuthorsGridView"
autogeneratecolumns="true"
runat="server">
</asp:gridview>
</form>
</body>
</html>
Remarks
When you set the DataSource property, the ValidateDataSource method is called. In addition, if the data-bound control has already been initialized, the OnDataPropertyChanged method is called to set the RequiresDataBinding property to true.
This property cannot be set by themes or style sheet themes. For more information, see ThemeableAttribute and ASP.NET Themes and Skins.
Applies to
See also
GitHub पर हमारे साथ सहयोग करें
इस सामग्री का स्रोत GitHub पर पाया जा सकता है, जहाँ आप समस्याएँ बना और समीक्षा भी कर सकते हैं और अनुरोध खींच सकते हैं. अधिक जानकारी के लिए, हमारे योगदानकर्ता गाइड देखें.
