共用方式為


LoginViewDesigner.GetEmptyDesignTimeHtml 方法

定義

當未定義目前範本時,取得在設計階段呈現關聯控制項的替代符號之標記。

protected:
 override System::String ^ GetEmptyDesignTimeHtml();
protected override string GetEmptyDesignTimeHtml ();
override this.GetEmptyDesignTimeHtml : unit -> string
Protected Overrides Function GetEmptyDesignTimeHtml () As String

傳回

String

字串,包含在設計介面上呈現給替代符號的標記文字。

範例

下列程式碼範例示範如何覆寫 GetEmptyDesignTimeHtml 繼承自 LoginViewDesigner 類別的 類別中的 方法,以變更在設計階段衍生自 LoginView 類別的控制面板。 此範例會產生預留位置的標記,其中包含為相關聯控制項定義的所有 RoleGroup 物件名稱。

// Generate the design-time markup for the control 
// when the template is empty.
protected override string GetEmptyDesignTimeHtml()
{
    // Generate a design-time placeholder containing the names of all
    // the role groups.
    MyLoginView myLoginViewCtl = (MyLoginView)ViewControl;
    RoleGroupCollection roleGroups = myLoginViewCtl.RoleGroups;
    string roleNames = null;

    // If there are any role groups, form a string of their names.
    if (roleGroups.Count > 0)
    {
        roleNames = "Role Groups: <br />   " + 
            roleGroups[0].ToString();

        for( int rgX = 1; rgX < roleGroups.Count; rgX++ )
            roleNames += 
                "<br />   " + roleGroups[rgX].ToString();
    }
    return CreatePlaceHolderDesignTimeHtml( roleNames);
} // GetEmptyDesignTimeHtml
' Generate the design-time markup for the control 
' when the template is empty.
Protected Overrides Function GetEmptyDesignTimeHtml() As String

    ' Generate a design-time placeholder containing the names of all
    ' the role groups.
    Dim myLoginViewCtl As MyLoginView = CType(ViewControl, MyLoginView)
    Dim roleGroups As RoleGroupCollection = myLoginViewCtl.RoleGroups
    Dim RoleNames As String = Nothing
    Dim rgX As Integer

    ' If there are any role groups, form a string of their names.
    If roleGroups.Count > 0 Then

        roleNames = "Role Groups: <br />   " & _
            roleGroups(0).ToString()

        For rgX = 1 To roleGroups.Count - 1
            roleNames &= "<br />   " & _
                roleGroups(rgX).ToString()
        Next rgX
    End If

    Return CreatePlaceHolderDesignTimeHtml(roleNames)

End Function ' GetEmptyDesignTimeHtml

備註

方法 GetEmptyDesignTimeHtml 會先格式化字串訊息,指定相關聯 LoginView 控制項目前範本的名稱,並指定範本是空的。 然後,會產生 GetEmptyDesignTimeHtml 包含該訊息之預留位置的標記。

適用於

另請參閱