GridView.SortExpression Properti
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Mendapatkan ekspresi pengurutan yang terkait dengan kolom atau kolom yang sedang diurutkan.
public:
virtual property System::String ^ SortExpression { System::String ^ get(); };[System.ComponentModel.Browsable(false)]
public virtual string SortExpression { get; }[<System.ComponentModel.Browsable(false)>]
member this.SortExpression : stringPublic Overridable ReadOnly Property SortExpression As StringNilai Properti
Ekspresi pengurutan yang terkait dengan kolom atau kolom yang sedang diurutkan.
- Atribut
Contoh
Contoh berikut menunjukkan cara menggunakan SortExpression properti untuk menentukan nama kolom yang sedang diurutkan.
<%@ 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">
void CustomersGridView_RowCreated(Object sender, GridViewRowEventArgs e)
{
// Use the RowType property to determine whether the
// row being created is the header row.
if (e.Row.RowType == DataControlRowType.Header)
{
// Call the GetSortColumnIndex helper method to determine
// the index of the column being sorted.
int sortColumnIndex = GetSortColumnIndex();
if (sortColumnIndex != -1)
{
// Call the AddSortImage helper method to add
// a sort direction image to the appropriate
// column header.
AddSortImage(sortColumnIndex, e.Row);
}
}
}
// This is a helper method used to determine the index of the
// column being sorted. If no column is being sorted, -1 is returned.
int GetSortColumnIndex()
{
// Iterate through the Columns collection to determine the index
// of the column being sorted.
foreach (DataControlField field in CustomersGridView.Columns)
{
if (field.SortExpression == CustomersGridView.SortExpression)
{
return CustomersGridView.Columns.IndexOf(field);
}
}
return -1;
}
// This is a helper method used to add a sort direction
// image to the header of the column being sorted.
void AddSortImage(int columnIndex, GridViewRow headerRow)
{
// Create the sorting image based on the sort direction.
Image sortImage = new Image();
if (CustomersGridView.SortDirection == SortDirection.Ascending)
{
sortImage.ImageUrl = "~/Images/Ascending.jpg";
sortImage.AlternateText = "Ascending Order";
}
else
{
sortImage.ImageUrl = "~/Images/Descending.jpg";
sortImage.AlternateText = "Descending Order";
}
// Add the image to the appropriate header cell.
headerRow.Cells[columnIndex].Controls.Add(sortImage);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView AllowSorting Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView AllowSorting Example</h3>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
autogeneratecolumns="false"
emptydatatext="No data available."
allowsorting="true"
onrowcreated="CustomersGridView_RowCreated"
runat="server">
<columns>
<asp:boundfield datafield="CustomerID"
headertext="Customer ID"
headerstyle-wrap="false"
sortexpression="CustomerID"/>
<asp:boundfield datafield="CompanyName"
headertext="CompanyName"
headerstyle-wrap="false"
sortexpression="CompanyName"/>
<asp:boundfield datafield="Address"
headertext="Address"
headerstyle-wrap="false"
sortexpression="Address"/>
<asp:boundfield datafield="City"
headertext="City"
headerstyle-wrap="false"
sortexpression="City"/>
<asp:boundfield datafield="PostalCode"
headertext="Postal Code"
headerstyle-wrap="false"
sortexpression="PostalCode" />
<asp:boundfield datafield="Country"
headertext="Country"
headerstyle-wrap="false"
sortexpression="Country"/>
</columns>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="CustomersSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</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">
Sub CustomersGridView_RowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
' Use the RowType property to determine whether the
' row being created is the header row.
If e.Row.RowType = DataControlRowType.Header Then
' Call the GetSortColumnIndex helper method to determine
' the index of the column being sorted.
Dim sortColumnIndex As Integer = GetSortColumnIndex()
If sortColumnIndex <> -1 Then
' Call the AddSortImage helper method to add
' a sort direction image to the appropriate
' column header.
AddSortImage(sortColumnIndex, e.Row)
End If
End If
End Sub
' This is a helper method used to determine the index of the
' column being sorted. If no column is being sorted, -1 is returned.
Function GetSortColumnIndex() As Integer
' Iterate through the Columns collection to determine the index
' of the column being sorted.
Dim field As DataControlField
For Each field In CustomersGridView.Columns
If field.SortExpression = CustomersGridView.SortExpression Then
Return CustomersGridView.Columns.IndexOf(field)
End If
Next
Return -1
End Function
' This is a helper method used to add a sort direction
' image to the header of the column being sorted.
Sub AddSortImage(ByVal columnIndex As Integer, ByVal row As GridViewRow)
' Create the sorting image based on the sort direction.
Dim sortImage As New Image()
If CustomersGridView.SortDirection = SortDirection.Ascending Then
sortImage.ImageUrl = "~/Images/Ascending.jpg"
sortImage.AlternateText = "Ascending Order"
Else
sortImage.ImageUrl = "~/Images/Descending.jpg"
sortImage.AlternateText = "Descending Order"
End If
' Add the image to the appropriate header cell.
row.Cells(columnIndex).Controls.Add(sortImage)
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView AllowSorting Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView AllowSorting Example</h3>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
autogeneratecolumns="false"
emptydatatext="No data available."
allowsorting="true"
onrowcreated="CustomersGridView_RowCreated"
runat="server">
<columns>
<asp:boundfield datafield="CustomerID"
headertext="Customer ID"
headerstyle-wrap="false"
sortexpression="CustomerID"/>
<asp:boundfield datafield="CompanyName"
headertext="CompanyName"
headerstyle-wrap="false"
sortexpression="CompanyName"/>
<asp:boundfield datafield="Address"
headertext="Address"
headerstyle-wrap="false"
sortexpression="Address"/>
<asp:boundfield datafield="City"
headertext="City"
headerstyle-wrap="false"
sortexpression="City"/>
<asp:boundfield datafield="PostalCode"
headertext="Postal Code"
headerstyle-wrap="false"
sortexpression="PostalCode" />
<asp:boundfield datafield="Country"
headertext="Country"
headerstyle-wrap="false"
sortexpression="Country"/>
</columns>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="CustomersSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Keterangan
SortExpression Gunakan properti untuk menentukan ekspresi pengurutan yang terkait dengan kolom atau kolom yang sedang diurutkan.
Nota
Kontrol GridView memiliki fitur pengurutan bawaan yang secara otomatis mengatur properti ini. Properti ini biasanya hanya digunakan saat Anda perlu menentukan kolom atau kolom yang diurutkan secara terprogram atau saat Anda menambahkan fungsi pengurutan kustom Anda sendiri ke GridView kontrol.
Ketika beberapa kolom diurutkan, properti ini berisi daftar bidang yang dipisahkan koma untuk diurutkan.
