主题：打印凭证时的表头如何居中

Dim doc As PrintDoc = e.Form.GernatePrintDoc()
For Each c As Object In doc.body.children
    If typeof c Is prt.RenderTable Then
        c.Rows(0).Style.TextAlignHorz = prt.AlignHorzEnum.Center '第一行内容水平居中
        c.Rows(1).Style.TextAlignHorz = prt.AlignHorzEnum.Center '第一行内容水平居中
    End If
Next
doc.Preview()