CommandField.CausesValidation 屬性

參考

定義

命名空間:: System.Web.UI.WebControls

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

取得或設定值，指出是否要在使用者按一下 CommandField 欄位中的按鈕時執行驗證。

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

屬性值

Boolean

若要在使用者按一下 CommandField 欄位中的按鈕時執行驗證，則為 true，否則為 false。預設為 true。

範例

下列程式代碼範例示範如何使用 CausesValidation 屬性來防止在按下字段中的 CommandField 按鈕時發生驗證。

重要

這個範例有一個可接受使用者輸入的文字方塊，這可能會造成安全性威脅。根據預設，ASP.NET Web 網頁會驗證使用者輸入未包含指令碼或 HTML 項目。如需詳細資訊，請參閱 Script Exploits Overview (指令碼攻擊概觀)。

<%@ 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>

備註

CausesValidation使用屬性來指定是否要在按下欄位中的CommandField按鈕時執行驗證。當此屬性設定為 true時，預設會驗證頁面上的所有驗證控件。若要將驗證限制為只有特定驗證控件群組，請建立驗證群組，然後將屬性設定 ValidationGroup 為驗證群組的名稱。如需驗證群組的詳細資訊，請參閱 BaseValidator.ValidationGroup。

適用於

共用方式為

CommandField.CausesValidation 屬性

定義

屬性值

範例

備註

適用於

另請參閱

其他資源