Bagikan melalui

ImageField.ReadOnly Properti

Definisi

Ruang nama:
System.Web.UI.WebControls
Rakitan:
System.Web.dll

Mendapatkan atau menetapkan nilai yang menunjukkan apakah nilai bidang yang ditentukan oleh DataImageUrlField properti dapat dimodifikasi dalam mode edit.

public:
 virtual property bool ReadOnly { bool get(); void set(bool value); };
public virtual bool ReadOnly { get; set; }
member this.ReadOnly : bool with get, set
Public Overridable Property ReadOnly As Boolean

Nilai Properti

Boolean

true untuk menunjukkan bahwa nilai bidang tidak dapat dimodifikasi dalam mode edit; jika tidak, false. Defaultnya adalah false.

Contoh

Contoh berikut menunjukkan cara menggunakan ReadOnly properti untuk menunjukkan bahwa nilai bidang yang mewakili URL ke gambar yang ImageField ditampilkan dalam objek tidak dapat dimodifikasi dalam mode edit.


<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ImageField ReadOnly Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>ImageField ReadOnly Example</h3>
                       
      <asp:gridview id="EmployeesGrid"
        autogeneratecolumns="false"
        datasourceid="EmployeeSource"
        autogenerateeditbutton="true"
        datakeynames="EmployeeID"   
        runat="server">
      
        <columns>

          <asp:imagefield dataimageurlfield="PhotoPath"
            alternatetext="Employee Photo"
            nulldisplaytext="No image on file."
            headertext="Photo"  
            readonly="true"/>
          <asp:boundfield datafield="FirstName"
            headertext="First Name"/>
          <asp:boundfield datafield="LastName"
            headertext="Last Name"/>
        
        </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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [PhotoPath] From [Employees]"
        updatecommand="Update [Employees] Set [LastName]=@LastName, [FirstName]=@FirstName Where [EmployeeId]=@EmployeeID"
        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">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ImageField ReadOnly Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>ImageField ReadOnly Example</h3>
                       
      <asp:gridview id="EmployeesGrid"
        autogeneratecolumns="false"
        datasourceid="EmployeeSource"
        autogenerateeditbutton="true"
        datakeynames="EmployeeID"   
        runat="server">
      
        <columns>

          <asp:imagefield dataimageurlfield="PhotoPath"
            alternatetext="Employee Photo"
            nulldisplaytext="No image on file."
            headertext="Photo"  
            readonly="true"/>
          <asp:boundfield datafield="FirstName"
            headertext="First Name"/>
          <asp:boundfield datafield="LastName"
            headertext="Last Name"/>
        
        </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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [PhotoPath] From [Employees]"
        updatecommand="Update [Employees] Set [LastName]=@LastName, [FirstName]=@FirstName Where [EmployeeId]=@EmployeeID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
            
    </form>
  </body>
</html>

Keterangan

Secara default, nilai bidang yang ditentukan oleh DataImageUrlField properti dapat dimodifikasi oleh pengguna saat kontrol terikat data dalam mode edit. Untuk mencegah pengguna mengubah nilai bidang, atur properti ini ke true.

Nota

Dalam objek ImageField , DataImageUrlField properti biasanya berisi nama bidang yang berisi URL ke gambar yang ditampilkan dalam objek.

Berlaku untuk

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