我們知道PowerPoint演示文件(PPT)沒有任何方法來識別幻燈片內(nèi)的特定形狀，除非使用一個(gè)內(nèi)部獨(dú)特的Id。但是這種方法對于開發(fā)者來說優(yōu)勢相當(dāng)復(fù)雜的。本文將描述一個(gè)簡單的技術(shù)就能更容易的在幻燈片中找到一個(gè)特定的形狀，而不使用它的內(nèi)部Id。

在這里我們需要借助Aspose.Slides這個(gè)控件的幫助。

所有添加到幻燈片的形狀都有一些Alternative Text替代文本。我們建議開發(fā)人員使用Alternative Text替代文本尋找一個(gè)特定的形狀。您可以使用MS PowerPoint來定義替代文本的對象,如下所示:

具體實(shí)現(xiàn)代碼如下：

[C#]

//Method implementation to find a shape in a slide using its alternative text
Shape FindShape(Slide slide, string alttext)
{
    //Iterating through all shapes inside the slide
    for (int i = 0; i < slide.Shapes.Count; i++)
    {


        //If the alternative text of the slide matches with the required one then
        //return the shape
        if (slide.Shapes[i].AlternativeText.CompareTo(alttext) == 0)
            return slide.Shapes[i];
    }
    return null;
}

[Visual Basic]

'Method implementation to find a shape in a slide using its alternative text
Private Function FindShape(ByVal slide As Slide, ByVal alttext As String) As Shape
    Dim i As Integer


    'Iterating through all shapes inside the slide
    For i = 0 To slide.Shapes.Count - 1


        'If the alternative text of the slide matches with the required one
        'then return the shape
        If slide.Shapes(i).AlternativeText.CompareTo(alttext) = 0 Then
            Return slide.Shapes(i)
        End If
    Next

    Return Nothing
End Function

[C#]

//Calling FindShape method and passing the slide reference with the
//alternative text of the shape to be found
Shape shape = FindShape(slide, "Shape1");

[Visual Basic]

'Calling FindShape method and passing the slide reference with the
'alternative text of the shape to be found
Dim shape As Shape = FindShape(Slide, "Shape1")