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CommandField.CausesValidation Properti

  • Referensi

Definisi

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

Mendapatkan atau menetapkan nilai yang menunjukkan apakah validasi dilakukan saat pengguna mengklik tombol di CommandField bidang.

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

Nilai Properti

Boolean

true untuk melakukan validasi saat pengguna mengklik tombol di CommandField bidang; jika tidak, false. Default adalah true.

Contoh

Contoh kode berikut menunjukkan cara menggunakan CausesValidation properti untuk mencegah validasi terjadi saat tombol di bidang diklik CommandField .

Penting

Contoh ini memiliki kotak teks yang menerima input pengguna, yang merupakan potensi ancaman keamanan. Secara default, ASP.NET halaman Web memvalidasi bahwa input pengguna tidak menyertakan elemen skrip atau HTML. Untuk informasi selengkapnya, lihat Gambaran Umum Eksploitasi Skrip.

<%@ 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>CommandField CausesValidation Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>CommandField CausesValidation Example</h3>

      <!-- Normally, the validation controls declared in the            -->
      <!-- EditItemTemplate of each TemplateField field column would    -->
      <!-- prevent the user from leaving a field value empty; however,  -->
      <!-- because the CausesValidation property of the CommandField    -->
      <!-- field column is set to false, validation does not occur when -->
      <!-- the user clicks a button in the CommandField field column.   -->
      <asp:gridview id="CustomerGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="false"
        datakeynames="CustomerID"
        cellpadding="10"   
        runat="server">
                
        <columns>
        
          <asp:commandfield showeditbutton="true"
            causesvalidation="false"
            headertext="Edit"/> 
        
          <asp:boundfield datafield="CustomerID"
            headertext="Customer ID"
            readonly="true"/>
            
          <asp:templatefield headertext="Company Name"
            itemstyle-verticalalign="Top">
            
            <itemtemplate>
              <%#Eval("CompanyName")%>
            </itemtemplate>
            
            <edititemtemplate>
              <asp:textbox id="CompanyNameTextBox"
                text='<%#Bind("CompanyName")%>'
                width="90"
                runat="server"/>
              <br/>
              <asp:requiredfieldvalidator id="CompanyNameRequiredValidator"
                controltovalidate="CompanyNameTextBox"
                display="Dynamic"
                text="Please enter the company name." 
                runat="server"/>                                      
            </edititemtemplate>
            
          </asp:templatefield>
          
          <asp:templatefield headertext="Address"
            itemstyle-verticalalign="Top">
            
            <itemtemplate>
              <%#Eval("Address")%>
            </itemtemplate>
            
            <edititemtemplate>
              <asp:textbox id="AddressTextBox"
                text='<%#Bind("Address")%>'
                width="90"
                runat="server"/>
              <br/>
              <asp:requiredfieldvalidator id="AddressRequiredValidator"
                controltovalidate="AddressTextBox"
                display="Dynamic"
                text="Please enter the address."
                runat="server"/>                      
            </edititemtemplate>
            
          </asp:templatefield>
          
          <asp:templatefield headertext="City"
            itemstyle-verticalalign="Top">
            
            <itemtemplate>
              <%#Eval("City")%>
            </itemtemplate>
            
            <edititemtemplate>
              <asp:textbox id="CityTextBox"
                text='<%#Bind("City")%>'
                width="90"
                runat="server"/>
              <br/>
              <asp:requiredfieldvalidator id="CityRequiredValidator"
                controltovalidate="CityTextBox"
                display="Dynamic"
                text="Please enter the city."
                runat="server"/>                      
            </edititemtemplate>
            
          </asp:templatefield>
            
        </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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City] From [Customers]"             
        updatecommand="Update [Customers] Set [CompanyName]=@CompanyName, [Address]=@Address, [City]=@City Where [CustomerID] = @CustomerID" 
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </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">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>CommandField CausesValidation Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>CommandField CausesValidation Example</h3>

      <!-- Normally, the validation controls declared in the            -->
      <!-- EditItemTemplate of each TemplateField field column would    -->
      <!-- prevent the user from leaving a field value empty; however,  -->
      <!-- because the CausesValidation property of the CommandField    -->
      <!-- field column is set to false, validation does not occur when -->
      <!-- the user clicks a button in the CommandField field column.   -->
      <asp:gridview id="CustomerGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="false"
        datakeynames="CustomerID"
        cellpadding="10"   
        runat="server">
                
        <columns>
        
          <asp:commandfield showeditbutton="true"
            causesvalidation="false"
            headertext="Edit"/> 
        
          <asp:boundfield datafield="CustomerID"
            headertext="Customer ID"
            readonly="true"/>
            
          <asp:templatefield headertext="Company Name"
            itemstyle-verticalalign="Top">
            
            <itemtemplate>
              <%#Eval("CompanyName")%>
            </itemtemplate>
            
            <edititemtemplate>
              <asp:textbox id="CompanyNameTextBox"
                text='<%#Bind("CompanyName")%>'
                width="90"
                runat="server"/>
              <br/>
              <asp:requiredfieldvalidator id="CompanyNameRequiredValidator"
                controltovalidate="CompanyNameTextBox"
                display="Dynamic"
                text="Please enter the company name." 
                runat="server"/>                                      
            </edititemtemplate>
            
          </asp:templatefield>
          
          <asp:templatefield headertext="Address"
            itemstyle-verticalalign="Top">
            
            <itemtemplate>
              <%#Eval("Address")%>
            </itemtemplate>
            
            <edititemtemplate>
              <asp:textbox id="AddressTextBox"
                text='<%#Bind("Address")%>'
                width="90"
                runat="server"/>
              <br/>
              <asp:requiredfieldvalidator id="AddressRequiredValidator"
                controltovalidate="AddressTextBox"
                display="Dynamic"
                text="Please enter the address."
                runat="server"/>                      
            </edititemtemplate>
            
          </asp:templatefield>
          
          <asp:templatefield headertext="City"
            itemstyle-verticalalign="Top">
            
            <itemtemplate>
              <%#Eval("City")%>
            </itemtemplate>
            
            <edititemtemplate>
              <asp:textbox id="CityTextBox"
                text='<%#Bind("City")%>'
                width="90"
                runat="server"/>
              <br/>
              <asp:requiredfieldvalidator id="CityRequiredValidator"
                controltovalidate="CityTextBox"
                display="Dynamic"
                text="Please enter the city."
                runat="server"/>                      
            </edititemtemplate>
            
          </asp:templatefield>
            
        </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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City] From [Customers]"             
        updatecommand="Update [Customers] Set [CompanyName]=@CompanyName, [Address]=@Address, [City]=@City Where [CustomerID] = @CustomerID" 
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

Keterangan

CausesValidation Gunakan properti untuk menentukan apakah validasi dilakukan saat tombol di bidang diklikCommandField. Ketika properti ini diatur ke true, secara default semua kontrol validasi pada halaman divalidasi. Untuk membatasi validasi hanya ke grup kontrol validasi tertentu, buat grup validasi lalu atur ValidationGroup properti ke nama grup validasi. Untuk informasi selengkapnya tentang grup validasi, lihat BaseValidator.ValidationGroup.

Berlaku untuk

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